System for improving communication quality

Abstract

The utility model discloses a signal transmission system capable of improving communication quality, which comprises a transmitting end signal processing unit, at least one receiving end signal processing unit and at least one transmission channel connected with the two signal processing units. According to the invention, the transmission channel information signal of each transmission channel is formed, the transmission channel information signal of each transmission channel is fed back and transmitted to each sending end signal processing unit, and the sending end signal processing units adjust the characteristics of subsequent transmission signals, so that the signal quality of each transmission channel is improved or maintained.

Description

Technical Field

[0001] This utility model relates to a communication technology, and more particularly to a system that can improve the communication quality of a transmission channel. Background Technology

[0002] During the transmission of signals from one signal processing unit to another, factors such as aging or damage to communication components, or excessively high operating temperatures, can all cause changes in the characteristics of the transmitted signal, thereby affecting communication quality. Furthermore, the nonlinear characteristics of the communication components and transmission channels will also distort the signal, further impacting communication quality. While these two types of communication quality degradation factors do not significantly affect communication quality in low-bandwidth communications, they become increasingly apparent in high-bandwidth communications.

[0003] Optical communication systems offer higher bandwidths than other communication systems, such as radio wave or wireline communication. Furthermore, the light source in an optical communication system is essentially a nonlinear element. Moreover, factors such as aging, damage, or excessively high operating temperatures can unexpectedly alter the characteristics of the light source, thereby affecting the quality of the optical signal. This degradation of light source characteristics makes it difficult for the optical signal driving and modulation circuit to properly modulate the optical signal, leading to increased optical signal noise or bit errors. Therefore, high-bandwidth optical communication systems require more solutions to these communication quality degradation problems than other communication systems. Consequently, existing technologies in optical communication systems attempt to address these issues.

[0004] In optical communication systems, the degradation of light source quality is often difficult to predict. To ensure the quality of optical signal transmission, real-time monitoring of the optical signal quality is essential during signal transmission in optical communication systems. Furthermore, a key characteristic of light source quality degradation is the abnormal variation in average optical power. Therefore, existing technologies monitor the average optical power during signal transmission and adjust the optical signal drive and modulation circuits based on the real-time average optical power value to maintain a certain level of optical signal quality. A schematic diagram of this prior art is shown below. Figure 1 As shown.

[0005] Figure 1This is a schematic diagram of a system for improving the quality of optical communication in the prior art. The system 2 includes a transmitting signal processing unit 10, an optical transmission channel 20 connecting the two signal processing units, and a receiving signal processing unit 30. To monitor the average optical power of the light source 11, the optical communication system 2 places a photodetector 44 near the light source 11 in the transmitting signal processing unit 10 to capture a portion of the optical power of the optical signal LS. A transimpedance amplifier 45 is placed near the photodetector 44 to convert the analog current signal ES5 output by the photodetector 44 into an analog voltage signal ES6. The signal output and control circuit 13 of the transmitting signal processing unit 10 receives the voltage signal ES6. When the analog voltage signal ES6 decreases, the transmitting signal processing unit 10 determines that the average optical power of the light source 11 has decreased, and therefore increases the analog electrical signal ES1 output to the optical signal driving and modulation circuit 44. When the analog voltage signal ES6 increases, the transmitting signal processing unit 10 determines that the average optical power of the light source 11 has increased, and therefore decreases the analog electrical signal ES1 output to the optical signal driving and modulation circuit 44. In this way, the system maintains the average optical power of the light source 11 in order to maintain the communication quality of the system.

[0006] However, the aforementioned prior art has the following drawbacks:

[0007] Firstly, the additional installation of a photodetector and transimpedance amplifier next to the light source increases the packaging complexity of each optical component in the transmitting signal processing unit, thereby increasing material and production costs.

[0008] Secondly, setting up additional components next to the light source increases the volume of the optical components in the transmitter signal processing unit, which is not conducive to the high-density miniaturized optical connection requirements of applications such as data centers.

[0009] Third, the monitored information is only the average optical power of the light source and does not include information on the nonlinear characteristics of the light source. Therefore, it is insufficient for the system to accurately control the light source and to effectively maintain the quality of the optical signal. Utility Model Content

[0010] The main objective of this invention is to address the nonlinear characteristics of components and transmission channels in communication systems, as well as the signal degradation caused by unpredictable factors such as component aging and temperature fluctuations, thereby maintaining or even improving the communication quality of various communication systems. When applied to optical communication systems, this invention can further solve the problems of high manufacturing costs, unfavorable conditions for achieving high-density miniaturized optical connections required for applications such as data centers, and inability to effectively maintain optical signal quality in the prior art.

[0011] To address the aforementioned signal degradation problem, this invention provides a system that can improve communication quality. It can not only improve the communication quality of optical communication systems, but is also applicable to other communication systems such as radio wave communication or wire communication, thereby improving the communication quality of various communication systems.

[0012] This invention provides a system for improving communication quality, including a transmitting signal processing unit, at least one receiving signal processing unit, and at least one transmission channel connecting two signal processing units. The transmitting signal processing unit transmits signals. Each transmission channel connecting two signal processing units transmits the signals transmitted by the transmitting signal processing unit to its respective receiving signal processing unit. Each receiving signal processing unit analyzes the received signals from each transmission channel, generates transmission channel information signals for each transmission channel, and then feeds these transmission channel information signals back to the transmitting signal processing unit. The transmitting signal processing unit uses this information to adjust the characteristics of subsequent transmitted signals, thereby improving or maintaining the signal quality of each transmission channel.

[0013] The system includes two signal processing units that transmit signals to each other via a transmission channel connecting them. Each signal processing unit comprises a transmitting signal processing unit and a receiving signal processing unit. The transmitting signal processing unit receives a target transmission signal from the upper-level communication layer and converts it into a physical medium signal for each transmission channel. This signal is then transmitted to the receiving signal processing unit of the other signal processing unit via the transmission channel connecting the two signal processing units. The receiving signal processing unit transmits the received target transmission signal to its upper-level communication layer to complete the transmission. The receiving signal processing unit also transmits the transmission channel information signal for each transmission channel from the receiving signal processing unit to the other signal processing unit, as well as the transmission channel information signal from the other signal processing unit to the receiving signal processing unit. The transmission channel information signal of each transmission channel of the signal sent by the signal processing unit is transmitted to the transmitting end signal processing unit of the signal processing unit; each transmitting end signal processing unit adjusts the physical medium signal to be transmitted subsequently based on the transmission channel information signal of each transmission channel of the signal sent by the signal processing unit to the other signal processing unit; wherein each transmitting end signal processing unit also receives the target transmission signal from the upper-level communication layer of the signal processing unit, converts it into a physical medium signal, and transmits it to the receiving end signal processing unit of the other signal processing unit through each transmission channel connecting the two signal processing units; each transmitting end signal processing unit loads the transmission channel information signal of each transmission channel of the signal sent by the other signal processing unit to the signal processing unit together with the target transmission signal into the physical medium signal of each transmission channel, and transmits it to the receiving end signal processing unit of the other signal processing unit through each transmission channel connecting the two signal processing units.

[0014] Each of the transmission channels connecting the two signal processing units is an optical transmission channel; the system includes a transmitting signal processing unit, at least one optical transmission channel connecting the two signal processing units, and at least one receiving signal processing unit; wherein the transmitting signal processing unit further includes a signal output and control circuit, at least one optical signal driving and modulation circuit, and at least one electrical signal to optical signal conversion unit; wherein the signal output and control circuit is used to receive the target transmission signal from the upper-level network layer of the transmitting signal processing unit and the information signal of each transmission channel from the transmitting signal processing unit, and to determine the transmission channel information signal according to the transmission channel information signal. The target transmission signal is converted into an analog electrical signal output to the optical signal driving and modulation circuit of each transmission channel; wherein, the optical signal driving and modulation circuit of each transmission channel is used to convert the analog electrical signal from the signal output and control circuit of each transmission channel into a light source driving and modulation electrical signal output to each electrical signal to optical signal unit; each electrical signal to optical signal unit is used to convert the light source driving and modulation electrical signal from the optical signal driving and modulation circuit of each transmission channel into an optical signal of each transmission channel and transmit it to the optical transmission channel of each transmission channel; each optical transmission connecting two signal processing units The channel is used to transmit optical signals from each transmission channel of the transmitting end signal processing unit to the receiving end signal processing unit; each receiving end signal processing unit includes at least one optical signal to electrical signal unit, at least one transimpedance amplifier, and a signal input and control circuit; wherein each optical signal to electrical signal unit is used to convert the optical signal of each transmission channel into an analog current signal of each transmission channel; wherein each transimpedance amplifier of each transmission channel is used to convert the analog current signal from each optical signal to electrical signal unit into an analog voltage signal of each transmission channel and transmit it to the signal input control circuit; each The signal input and control circuit transmits each target transmission signal to the upper-level communication layer of each receiving end to achieve the purpose of transmitting each target transmission signal. Each signal input and control circuit also forms a transmission channel information signal for each transmission channel based on the acquired transmission channel information, and feeds back the transmission channel information signal for each transmission channel to the signal output and control circuit of the transmitting end signal processing unit, so that the signal output and control circuit can adjust the analog electrical signal subsequently output to the optical signal driving and modulation circuit of each transmission channel according to the transmission channel information signal of each transmission channel.

[0015] The system can also generate optical signals using external modulation. Each of the electrical signal to optical signal units of the transmitting end signal processing unit includes a light source to receive a light source driving signal from the optical signal driving and modulation circuit to generate a continuous light wave. Each of the electrical signal to optical signal units of the transmitting end signal processing unit also includes an external optical signal modulator to receive a light source modulation signal from the optical signal driving and modulation circuit, thereby modulating the continuous light wave of the signal of each transmission channel to generate the optical signal of each transmission channel.

[0016] In this case, the optical signals of at least two transmission channels share the same optical transmission channel that connects the two signal processing units.

[0017] The optical signals generated by the electrical signal to optical signal unit of each transmission channel sharing the same optical transmission channel connecting the two signal processing units have different wavelengths or polarization characteristics; each optical transmission channel connecting the two signal processing units as a common optical transmission channel has at least one optical combiner at one end of the transmitting signal processing unit, and the optical combiner combines the optical signals with different wavelengths or polarization characteristics of each transmission channel sharing the same optical transmission channel connecting the two signal processing units into the optical transmission channel connecting the two signal processing units as a common optical transmission channel.

[0018] In this system, at least two electrical signal to optical signal units of each transmission channel sharing the same optical transmission channel connecting two signal processing units receive light source driving signals from the optical signal driving and modulation circuit of the corresponding transmission channel to generate continuous light waves of the corresponding transmission channel; each continuous light wave has different wavelengths or polarization characteristics; the transmitting end signal processing unit also includes at least one common optical transmission channel and at least one optical combiner; each optical combiner causes continuous light waves with different wavelengths or polarization characteristics of each transmission channel sharing the same optical transmission channel connecting two signal processing units to converge into each common optical transmission channel; the continuous light waves of each transmission channel sequentially pass through each designated channel external optical signal modulator of each corresponding optical channel on the common optical transmission channel; each designated channel external optical signal modulator receives light source modulation signals from the optical signal driving and modulation circuit of the corresponding transmission channel and modulates only the continuous light waves of the corresponding transmission channel to generate the optical signal of the corresponding transmission channel; the optical signals of each transmission channel sharing the common optical transmission channel enter the same optical transmission channel connecting two signal processing units.

[0019] The transmitting signal processing unit has at least one multi-transmission channel light source; each multi-transmission channel light source receives a light source driving signal from each optical signal driving and modulation circuit to generate at least two continuous light waves with different wavelengths or polarization characteristics for each transmission channel; the continuous light waves of each transmission channel generated by the same multi-transmission channel light source sequentially pass through each designated channel external optical signal modulator of the corresponding optical channel in the same common optical transmission channel; each designated channel external optical signal modulator receives a light source modulation signal from the optical signal driving and modulation circuit of the corresponding transmission channel and modulates only the continuous light wave of the corresponding transmission channel to generate the optical signal of the corresponding transmission channel; the optical signals of each transmission channel sharing the common optical transmission channel enter the same optical transmission channel connecting the two signal processing units.

[0020] Each of the optical transmission channels that serve as a common optical transmission channel connecting two signal processing units has at least one optical splitter at one end of the receiving signal processing unit; each optical splitter splits optical signals of different wavelengths or polarization characteristics of each transmission channel that shares the same optical transmission channel connecting two signal processing units, and transmits them to the optical signal to electrical signal unit of each corresponding transmission channel respectively.

[0021] In this process, the optical signal of each transmission channel that shares the same optical transmission channel connecting the two signal processing units enters a common optical transmission channel of the receiving signal processing unit; the optical signal of each transmission channel passes sequentially through a designated channel detector corresponding to each transmission channel in the common optical transmission channel; the designated channel detector of each transmission channel only absorbs and detects the optical signal of the corresponding transmission channel, and thus generates an analog current signal of the corresponding transmission channel, and transmits the analog current signal to each transimpedance amplifier of the corresponding transmission channel.

[0022] The system also includes two signal processing units, which transmit signals to each other through at least one optical transmission channel connecting them. Each signal processing unit includes a signal output and control circuit, at least one optical signal driving and modulation circuit, at least one electrical signal to optical signal unit, at least one optical signal to electrical signal unit, at least one transimpedance amplifier, and a signal input and control circuit. Each receiving signal processing unit transmits the received target transmission signal to its upper-level communication layer to complete the transmission of the target transmission signal. Each receiving signal processing unit transmits information signals from each transmission channel of the signal transmitted from itself to the other signal processing unit, and information signals from each transmission channel of the signal transmitted from the other signal processing unit to itself. The channel information signal is transmitted to the signal output and control circuit of the same signal processing unit; the signal output and control circuit of each signal processing unit is used to adjust the analog electrical signal subsequently output to the optical signal driving and modulation circuit of each transmission channel according to the transmission channel information signal of each transmission channel that transmits the signal from the signal processing unit to another signal processing unit; the signal output and control circuit of each signal processing unit also receives the target transmission signal from the upper-level communication layer of the signal processing unit, converts it into an analog electrical signal that is transmitted to the optical signal driving and modulation circuit of each transmission channel, and transmits it to another signal processing unit; the signal output and control circuit of each signal processing unit loads the transmission channel information signal of each transmission channel that sends the signal from another signal processing unit to the signal processing unit and the target transmission signal together into the analog electrical signal output to the optical signal driving and modulation circuit of each transmission channel, and transmits it to another signal processing unit.

[0023] The system includes at least one optical transmission channel connecting two signal processing units, enabling the two signal processing units to transmit signals to each other through this optical transmission channel. Each of the two signal processing units has at least one transmission channel that transmits signals through the optical transmission channel connecting the two signal processing units; this optical transmission channel is the common optical transmission channel for each of the two transmission channels. The optical signals generated by the electrical signal-to-optical signal conversion unit of each transmission channel in all signal processing units that transmits signals through this common optical transmission channel have different wavelengths or polarization characteristics. Each optical transmission channel connecting the two signal processing units has an optical multiplexer at each end connected to the two signal processing units. Each optical multiplexer causes all optical signals from the connected signal processing units sharing the optical transmission channel to enter the optical transmission channel connecting the two signal processing units, and causes all optical signals from the other signal processing unit sharing the optical transmission channel to be transmitted to the corresponding optical signal-to-electrical signal conversion unit of the corresponding transmission channel in the corresponding signal processing unit.

[0024] Furthermore, when the transmission channel connecting two signal processing units has significant loss and nonlinear characteristics, the signal obtained by the receiving signal processing unit may not accurately reflect the signal from the transmitting signal processing unit and the actual characteristics of the transmission channel. However, the following transmission channel calibration and optimization procedure can ensure that the receiving signal processing unit can analyze the received signal to obtain the signal from the transmitting signal processing unit and the actual characteristics of the transmission channel:

[0025] Transmission channel calibration and optimization procedure: Under the condition that the receiving signal processing unit receives good signal quality, the receiving signal processing unit captures and stores the transmitted signal characteristics, and the transmitting signal processing unit captures and stores the received signal characteristics. These two types of signal characteristics together form the transmission channel information (hereinafter referred to as appropriate transmission channel information) for which the communication system has good communication quality. Furthermore, under the condition that each transmission channel remains unchanged, during subsequent signal transmission, the receiving signal processing unit captures and stores the transmitted signal characteristics, and the transmitting signal processing unit captures and stores the received signal characteristics. These two types of signal characteristics together form the transmission channel information (hereinafter referred to as real-time transmission channel information) for the communication system. By comparing and analyzing the real-time transmission channel information and the appropriate transmission channel information, the actual characteristics of the signal from the transmitting signal processing unit and the transmission channel can be determined. Based on the analysis results, the signal transmission of the transmitting signal processing unit can be adjusted to ensure communication quality.

[0026] Furthermore, since high-bandwidth optical communication systems require more solutions to the aforementioned communication quality degradation problems compared to other communication systems, and because existing technologies exist for monitoring average optical power around the light source, this invention specifically describes and illustrates optical communication systems. However, other types of communication systems can also refer to the description and examples provided in this invention regarding optical communication systems, and modify the generation and transmission methods of physical medium signals for each type of communication system, thus applying the schematic principles of this invention in optical communication systems to various types of communication systems.

[0027] This invention provides a system for improving the quality of optical communication systems, comprising a transmitting signal processing unit, at least one receiving signal processing unit, and at least one optical transmission channel connecting the two signal processing units for transmitting optical signals. The transmitting signal processing unit has at least one electrical signal to optical signal conversion unit to generate the optical signals required for transmission through each transmission channel. Each optical transmission channel connecting the two signal processing units transmits the optical signals of one or more transmission channels. Each receiving signal processing unit has at least one optical signal to electrical signal conversion unit to receive the optical signals from each transmission channel. Each receiving signal processing unit analyzes the received optical signals, extracts the transmission channel information signals of each transmission channel, and feeds these signals back to the transmitting signal processing unit. The transmitting signal processing unit then adjusts the optical signals transmitted to each transmission channel based on these transmission channel information signals to maintain or even improve communication quality.

[0028] The light source used in an optical communication system is itself a nonlinear element. The optical signal driving and modulation circuitry of the transmission channel must be compatible with the characteristics of the light source in each transmission channel. Otherwise, it will result in poor optical signal quality or wasted light source driving energy. For example:

[0029] Firstly, when the light source is a laser, and the laser is pulsed amplitude modulated (PAM) using the light source drive and modulation current, if the light source drive and modulation current corresponding to the smallest digital signal (e.g., 0 in PAM2 or 00 in PAM4) is smaller than the laser threshold current, energy will be wasted. This will result in a small difference in optical power between the smallest digital signal (e.g., 0 in PAM2 or 00 in PAM4) and the next higher-order digital signal (e.g., 1 in PAM2 or 01 in PAM4), making it difficult for the receiving signal processing unit to distinguish the corresponding digital signals and causing bit errors.

[0030] Secondly, when the light source is a laser, and the laser pulse wave amplitude is modulated by the light source driving and modulation current, if the light source driving and modulation current corresponding to the minimum digital signal (e.g., 0 in PAM2 or 00 in PAM4) is much larger than the laser critical current, the optical power corresponding to the minimum digital signal will be too large, which will waste energy and cause the noise-signal ratio to be too high, resulting in bit errors.

[0031] Third, if the slope efficiency of the light source is greater than expected, the optical power corresponding to each digital signal will be too high. This will cause the detector in the receiver's signal processing unit to saturate for the optical power corresponding to the larger digital signal (e.g., PAM4 11), or cause the transimpedance amplifier in the receiver's signal processing unit to saturate for the current corresponding to the larger digital signal (e.g., PAM4 11). Both types of saturation will result in uneven optical power level spacing between the digital signals, leading to bit errors.

[0032] Fourth, if the slope efficiency of the light source is less than expected, the optical power of each corresponding digital signal will be too small, resulting in an excessively high noise ratio and thus generating bit errors.

[0033] Fifth, if the slope efficiency of the light source has obvious nonlinear characteristics, it may cause the analog electrical signal corresponding to each digital signal to fail to fall within the allowable range of the digital signal judgment circuit of the signal input and control circuit of the receiving end signal processing unit, resulting in bit errors.

[0034] Compared to existing technologies that only monitor the average optical power of the light source in the transmitting-end signal processing unit, this invention monitors the transmission channel characteristics in the receiving-end signal processing unit. Therefore, this invention has the following five advantages over existing technologies:

[0035] Firstly, since the receiving end signal processing unit already has a photodetector for receiving optical signals from each transmission channel, the transmission channel information signal can be captured. Therefore, the size, process and cost of the optoelectronic component structure of the transmitting end signal processing unit can be reduced, which is beneficial to the realization of high-density miniaturized optical connections required for applications such as data centers.

[0036] Secondly, the monitored information signals from each transmission channel not only include average optical power information, but also reflect the overall loss and nonlinear characteristics of the transmission channel. Using this more complete information to adjust the optical signal generated by the transmitting end signal processing unit can drive the light source to produce an optical signal that conforms to the characteristics of the transmission channel, further improving communication quality.

[0037] Third, the power of the signal transmission unit at the transmitting end can be adjusted according to the loss of each transmission channel, thereby reducing the energy consumption required for communication.

[0038] Fourth, because it can significantly improve the linearity of physical layer signals, it can reduce the signal processing burden at the signal transmitting and receiving ends, thus reducing the energy consumption required for communication.

[0039] Fifth, because it can significantly improve the linearity of the signal, higher-order coding methods can be applied to improve the signal transmission speed.

[0040] The transmission channel referred to in this invention is the path through which a signal is transmitted from one end to the other. If there are more than one different signal transmission path between the two ends, then there are more than one different transmission channel. Taking an optical communication system as an example, the signal output and control circuit of the transmitting end signal processing unit may reach the signal input and control circuit of the receiving end signal processing unit through more than one optical signal driving and modulation circuit, more than one light source, more than one external optical signal modulator, more than one optical transmission channel, more than one optical combiner, more than one optical add-drop multiplexer, more than one optical splitter, more than one optical detector, and more than one transimpedance amplifier located in the receiving end signal processing unit. Because the target transmission signal can be transmitted through several paths, there are more than one transmission channel between the signal output and control circuit of the transmitting end signal processing unit and the signal input and control circuit of the receiving end signal processing unit.

[0041] The optical transmission channel referred to in this invention is an optical signal channel consisting of optical signal transmission media (such as optical fiber, waveguide, or free space) and optical connectors connecting the various optical transmission media, connected in series. It is worth noting that more than one transmission channel can share the same optical transmission channel through various multiplexing technologies (such as wavelength multiplexing (WDM), polarization multiplexing (PDM), etc.).

[0042] The common optical transmission channel referred to in this invention is an optical transmission channel that transmits signals from multiple transmission channels. When an optical transmission channel transmits optical signals from several transmission channels of the same signal processing unit, or transmits optical signals from different signal processing units, then the optical transmission channel is a common optical transmission channel.

[0043] The optical transmission channel connecting two signal processing units, as referred to in this invention, is an optical transmission channel located between two signal processing units, enabling any signal processing unit to transmit optical signals to the other signal processing unit. This optical transmission channel connecting two signal processing units can transmit optical signals from multiple transmission channels. Furthermore, when the same optical transmission channel connecting two signal processing units can transmit optical signals from several transmission channels of the same signal processing unit, or transmit optical signals from transmission channels of different signal processing units, this optical transmission channel connecting two signal processing units serves as a common optical transmission channel.

[0044] The target transmission signal referred to in this invention is the main signal that the transmitting end signal processing unit intends to transmit to the receiving end signal processing unit. The target transmission signal originates from the upper-level communication layer of the transmitting end signal processing unit and is ultimately transmitted to the upper-level communication layer of the receiving end signal processing unit. The transmission method from the upper-level communication layer of the transmitting end to the transmitting end signal processing unit can be either serial or parallel. Similarly, the transmission method from the receiving end signal processing unit to the upper-level communication layer of the receiving end can also be either serial or parallel.

[0045] The physical medium signal referred to in this invention refers to a signal transmitted in a specific physical form within a physical medium transmission channel. For example, a physical medium signal transmitted in the form of light in an optical transmission channel is an optical signal; a physical medium signal transmitted in the form of voltage or current in an electrical transmission channel is an electrical signal; and a physical medium signal transmitted in the form of radio waves in space is an electromagnetic wave signal. Since a transmission channel can be formed by connecting several physical medium transmission channels in series, signals may be transmitted sequentially in different physical media within the same transmission channel, and therefore the signals will also undergo sequential conversions of different physical medium signal forms.

[0046] The analog level value of the physical medium signal for a digital signal code, as referred to in this invention, is the analog characteristic value corresponding to the digital signal code when the physical medium signal exists. Taking an optical signal as an example, if the optical signal is an amplitude-modulated (PAM4) signal, then the analog level value of the optical signal corresponding to each digital signal code is the optical power corresponding to that digital signal code. The 00 digital signal code corresponds to the lowest optical power, the 01 digital signal code corresponds to an optical power between the 00 digital signal code and the 10 digital signal code, the 10 digital signal code corresponds to an optical power between the 01 digital signal code and the 11 digital signal code, and the 11 digital signal code corresponds to the highest optical power. Furthermore, if the physical medium signal is a voltage signal, then the analog level value of the physical medium signal for each digital signal code is the voltage it corresponds to.

[0047] The term "continuous optical wave" as used in this invention refers to an optical wave with constant amplitude and power and continuous phase.

[0048] The optical signal referred to in this invention refers to the light wave that carries the transmitted signal.

[0049] The light source referred to in this utility model includes, but is not limited to, light-emitting diodes (LEDs), micro LEDs, and lasers.

[0050] The multi-channel light source referred to in this utility model is one type of light source as described in this utility model. A multi-channel light source is a light source capable of generating two or more continuous light waves with different wavelengths or polarization characteristics. Each continuous light wave with a different wavelength or polarization characteristic corresponds to a different transmission channel. Multi-channel light sources include, but are not limited to, comb lasers or arrayed waveguide grating lasers.

[0051] The light source driving electrical signal referred to in this invention is an analog electrical signal output from the optical signal driving and modulation circuit to the light source, causing the light source to generate continuous light waves. In other words, it is the DC bias analog electrical signal output to the light source.

[0052] The light source modulation electrical signal referred to in this invention, when the system generates an optical signal using direct modulation, refers to the AC modulation electrical signal output from the optical signal driving and modulation circuit to the light source. When the system generates an optical signal using external modulation, it refers to the analog electrical signal output from the optical signal driving and modulation circuit to an external optical signal modulator, which modulates the continuous light wave into an optical signal.

[0053] The light source driving and modulation electrical signals referred to in this invention, when the system generates optical signals using direct modulation, refer to the sum of the DC bias electrical signal and the AC modulation electrical signal output from the optical signal driving and modulation circuit to the light source. When the system generates optical signals using external modulation, it refers to the light source driving electrical signal output from the optical signal driving and modulation circuit to the light source on one hand, causing the light source to generate a continuous light wave, and the light source modulation electrical signal output to an external optical signal modulator on the other hand, causing the external optical signal modulator to modulate the continuous light wave into an optical signal. That is, the light source driving and modulation electrical signals include both the light source driving electrical signal and the light source modulation electrical signal. Corresponding to each digital signal digit, the light source driving and modulation electrical signals have corresponding analog level values. Furthermore, when the light source driving and modulation electrical signals are analog currents, they are light source driving and modulation currents.

[0054] The optical signal driving and modulation circuit of this invention refers to a circuit that can receive analog electrical signals from a signal output and control circuit and output a light source driving electrical signal to the light source to generate continuous light waves, or output a light source driving and modulation electrical signal to generate optical signals, or output a light source modulation electrical signal to an external optical signal modulator to modulate the continuous light waves into optical signals. When the system generates optical signals using direct modulation, the optical signal driving and modulation circuit of this invention outputs a light source driving and modulation electrical signal to the light source, causing the light source to emit light and generate optical signals. When the system generates optical signals using external modulation, the optical signal driving and modulation circuit of this invention, on the one hand, outputs a light source driving electrical signal to the light source to drive the light source to generate continuous light waves, and on the other hand, outputs a light source modulation electrical signal to an external optical signal modulator to modulate the continuous light waves into optical signals.

[0055] The optical signal driving circuit referred to in this utility model is a circuit in the optical signal driving and modulation circuit that receives the driving analog electrical signal from the signal output and control circuit and outputs the light source driving electrical signal.

[0056] The optical signal modulation circuit referred to in this utility model is a circuit in the optical signal driving and modulation circuit that receives the modulated analog electrical signal from the signal output and control circuit and outputs the light source modulation electrical signal.

[0057] The external optical signal modulator referred to in this invention is a component that receives continuous light waves and modulates them into optical signals by receiving light source modulation electrical signals from the optical signal driving and modulation circuit. The external optical signal modulators referred to in this invention include, but are not limited to, electro-absorption optical modulators, ring resonator optical modulators, and Mach-Zehnder optical modulators.

[0058] The designated channel external optical signal modulator described in this utility model is one type of external optical signal modulator. A designated channel external optical signal modulator is a component that modulates a continuous light wave in a specific transmission channel into an optical signal without affecting continuous light waves or optical signals in other transmission channels. The designated channel external optical signal modulator is located on a common optical transmission channel transmitting optical signals from several transmission channels. It selectively modulates the continuous light wave in a specific transmission channel based on the different wavelengths and polarization characteristics of the continuous light waves or optical signals in each transmission channel, while allowing continuous light waves or optical signals from other transmission channels to pass. The designated channel external optical signal modulator described in this utility model includes, but is not limited to, ring resonant optical signal modulation.

[0059] The optical detector referred to in this utility model is a component that receives optical signals and converts them into analog current signals through photoelectric conversion effect.

[0060] The designated channel optical detector referred to in this utility model is one type of optical detector as described in this utility model. A designated channel optical detector is a component that absorbs and detects optical signals from a specific transmission channel without affecting optical signals from other transmission channels. The designated channel optical detector is located on a common optical transmission channel transmitting optical signals from several transmission channels. Based on the different wavelengths and polarization characteristics of the continuous light waves or optical signals from each transmission channel, it selectively absorbs and detects the optical signals from a specific transmission channel, generating a current signal corresponding to that channel. This current signal is then transmitted to the transimpedance amplifier of the corresponding transmission channel, while simultaneously allowing optical signals from other transmission channels to pass through. The designated channel optical detector of this utility model includes, but is not limited to, a ring resonator optical detector.

[0061] The transimpedance amplifier referred to in this invention is a component that receives analog current signals from an optical signal to an electrical signal unit and converts the analog current signals into analog voltage signals.

[0062] The signal output and control circuit referred to in this utility model refers to a circuit that can receive various digital signals, analyze various digital signals, perform calculations on various digital signals, store some signals and information, convert digital signals into analog electrical signals, and output digital signals and analog electrical signals.

[0063] The signal input and control circuit referred to in this utility model refers to a circuit that can receive various analog electrical signals and various digital signals, convert analog electrical signals into digital electrical signals, analyze various digital signals, perform calculations on various digital signals, store some signals and information, and output digital signals.

[0064] The electrical signal to optical signal unit referred to in this invention is a combination of components that receives light source driving electrical signals, light source modulation electrical signals, or optical signal driving and modulation circuits from each channel to generate optical signals for each channel. A light source is a necessary component of the electrical signal to optical signal unit. Furthermore, the electrical signal to optical signal unit may further include an external optical modulator and components that guide the optical signals or continuous light waves from each channel into a common optical transmission channel, including, but not limited to, an optical transmission channel, an optical combiner, or an optical multiplexer.

[0065] The optical signal to electrical signal unit referred to in this invention is a combination of components that receive optical signals from each channel and generate electrical signals for each channel. A detector is a necessary component of the optical signal to electrical signal unit. Furthermore, the optical signal to electrical signal unit may further include components that guide the optical signal transmission from each channel into the respective optical transmission channel, including, but not limited to, optical transmission channels, optical splitters, or optical multiplexers.

[0066] The optical combiner referred to in this utility model is a component that enables various optical signals or continuous optical waves to converge into the same optical transmission channel.

[0067] The optical splitter referred to in this utility model is a component that allows each optical signal or each continuous optical wave in the same optical transmission channel to enter each optical transmission channel respectively.

[0068] The optical multiplexer referred to in this invention is a component that enables optical signals or continuous light waves with different wavelengths or polarization characteristics to be transmitted through different paths.

[0069] The signal output and control circuit, optical signal driving and modulation circuit, light source, external optical modulator, optical transmission channel, optical combiner, optical splitter, optical multiplexer, optical detector, transimpedance amplifier, and signal input and control circuit referred to in this utility model are defined according to their functions and are not necessarily single or separate physical components. For example, if a physical integrated circuit contains the dual functions of a signal output and control circuit and an optical signal driving and modulation circuit, then in this utility model, the physical integrated circuit is considered as a series combination of a signal output and control circuit and an optical signal driving and modulation circuit. Or, if two physical integrated circuits are respectively responsible for the digital operation and digital signal to analog signal conversion functions of the signal output and control circuits, then in this utility model, the combination of the two physical integrated circuits is considered as a single signal output and control circuit. Attached Figure Description

[0070] Figure 1 This is a schematic diagram of a system for improving the quality of optical communication in the prior art.

[0071] Figure 2 This is a schematic diagram of the first embodiment of the system for improving the quality of general communication according to this utility model.

[0072] Figure 3 This is a schematic diagram of a second embodiment of the system for improving the quality of general communication according to this utility model.

[0073] Figure 4 This is a schematic diagram of the first embodiment of the system for improving the quality of optical communication according to this utility model.

[0074] Figure 5 This is a schematic diagram of the second embodiment of the system for improving the quality of optical communication according to this utility model.

[0075] Figure 6 This is a schematic diagram of the third embodiment of the system for improving the quality of optical communication according to this utility model.

[0076] Figure 7 This is a schematic diagram of the fourth embodiment of the system for improving the quality of optical communication according to this utility model.

[0077] Figure 8 This is a schematic diagram of the fifth embodiment of the system for improving the quality of optical communication according to this utility model.

[0078] Figure 9 This is a schematic diagram of the sixth embodiment of the system for improving the quality of optical communication according to this utility model.

[0079] Figure 10 This is a schematic diagram of the seventh embodiment of the system for improving the quality of optical communication according to this utility model.

[0080] Figure 11This is a schematic diagram of the eighth embodiment of the system for improving the quality of optical communication according to this utility model.

[0081] Figure 12 This is a schematic diagram of the ninth embodiment of the system for improving the quality of optical communication according to this utility model.

[0082] Figure 13 This is a schematic diagram of the tenth embodiment of the system for improving the quality of optical communication according to this utility model.

[0083] Figure label explanations: 2-System; 10-Transmitter signal processing unit; 20-Optical transmission channel connecting two signal processing units; 30-Receiver signal processing unit; 11-Light source; 12-Optical signal drive and modulation circuit; 13-Signal output and control circuit; 44-Photodetector near the light source; 45-Transistor amplifier near the light source; 34-Photodetector; 35-Transistor amplifier; 36-Signal input and control circuit; MS-Target transmission signal; ES1-Analog electrical signal; ES2-Light source drive and modulation electrical signal; ES3-Analog current signal; ES4-Analog voltage signal; ES5-Analog current signal; ES6-Analog voltage signal; LS-Optical signal; 0-System; 100-Transmitter signal processing unit 200 - Transmission channel connecting two signal processing units; 300 - Receiver signal processing unit; MS0 - Target transmission signal; PS0 - Physical medium signal; CS0 - Transmission channel information signal; QS0 - Transmission channel quality signal; 00 - System; 100L - Signal processing unit; 100R - Signal processing unit; 200L - Transmission channel connecting two signal processing units; 200R - Transmission channel connecting two signal processing units; 101L - Transmitter signal processing unit; 101R - Transmitter signal processing unit; 301L - Receiver signal processing unit; 301R - Receiver signal processing unit; MS0L - Target transmission signal; MS0R - Target transmission signal; PS0L - Physical medium signal Number; PS0R - Physical medium signal; CS0RL - Transmission channel information signal; CS0LR - Transmission channel information signal; QS0L - Transmission channel quality signal; QS0R - Transmission channel quality signal; 1 - System; 110 - Electrical signal to optical signal unit; 340 - Optical signal to electrical signal unit; ES20 - Light source drive and modulation signal; CS - Transmission channel information signal; QS - Transmission channel quality signal; 11C - Light source; 17 - External optical signal modulator; LSO - Continuous light wave; ES21 - Light source drive signal; ES22 - Light source modulation signal; 10L - Signal processing unit; 10R - Signal processing unit; 11L - Light source; 11R - Light source; 12L - Optical signal drive and modulation circuit; 12R - Optical signal drive and modulation circuit; 13L - Signal output and control circuit; 13R - Signal output and control circuit; 34L - Optical detector; 34R - Optical detector; 35L - Transimpedance amplifier; 35R - Transimpedance amplifier; 36L - Signal input and control circuit; 36R - Signal input and control circuit; 18L - Optical plug-in multiplexer; 18R - Optical plug-in multiplexer; MSL - Target transmission signal; MSR - Target transmission signal; ES1L - Analog electrical signal; ES1R - Analog electrical signal; ES2L - Light source drive and modulation electrical signal; ES2R - Light source drive and modulation electrical signal; ES3L - Analog current signal; ES3R - Analog current signal; ES4L - Analog voltage signal; ES4R - Analog voltage signal;LSL - Optical signal; LSR - Optical signal; CSRL - Transmission channel information signal; CSLR - Transmission channel information signal; QSL - Transmission channel quality signal; QSR - Transmission channel quality signal; 11CL - Light source; 11CR - Light source; 17L - External optical signal modulator; 17R - External optical signal modulator; ES21L - Light source drive signal; ES21R - Light source drive signal; ES22L - Light source modulation signal; ES22R - Light source modulation signal; LS0L - Continuous light wave; LS0R - Continuous light wave; 20La - Optical transmission channel connecting two signal processing units; 20Lb - Optical transmission channel connecting two signal processing units; 20Lc - Optical transmission channel connecting two signal processing units ; 20Ld - Optical transmission channel connecting two signal processing units; 20Ra - Optical transmission channel connecting two signal processing units; 20Rb - Optical transmission channel connecting two signal processing units; 20Rc - Optical transmission channel connecting two signal processing units; 20Rd - Optical transmission channel connecting two signal processing units; 11La - Light source; 11Lb - Light source; 11Lc - Light source; 11Ld - Light source; 11Ra - Light source; 11Rb - Light source; 11Rc - Light source; 11Rd - Light source; 12La - Optical signal driving and modulation circuit; 12Lb - Optical signal driving and modulation circuit; 12Lc - Optical signal driving and modulation circuit; 12Ld - Optical signal driving and modulation circuit; 12Ra - Optical signal driving... 12Rb - Optical signal drive and modulation circuit; 12Rc - Optical signal drive and modulation circuit; 12Rd - Optical signal drive and modulation circuit; 34La - Optical detector; 34Lb - Optical detector; 34Lc - Optical detector; 34Ld - Optical detector; 34Ra - Optical detector; 34Rb - Optical detector; 34Rc - Optical detector; 34Rd - Optical detector; 35La - Transimpedance amplifier; 35Lb - Transimpedance amplifier; 35Lc - Transimpedance amplifier; 35Ld - Transimpedance amplifier; 35Ra - Transimpedance amplifier; 35Rb - Transimpedance amplifier; 35Rc - Transimpedance amplifier; 35Rd - Transimpedance amplifier; ES1La - Analog electrical signal; ES1Lb - Analog electrical signal; ES1Lc - Analog electrical signal ES1Ld - Analog electrical signal; ES1Ra - Analog electrical signal; ES1Rb - Analog electrical signal; ES1Rc - Analog electrical signal; ES1Rd - Analog electrical signal; ES2La - Light source drive and modulation electrical signal; ES2Lb - Light source drive and modulation electrical signal; ES2Lc - Light source drive and modulation electrical signal; ES2Ld - Light source drive and modulation electrical signal; ES2Ra - Light source drive and modulation electrical signal; ES2Rb - Light source drive and modulation electrical signal; ES2Rc - Light source drive and modulation electrical signal; ES2Rd - Light source drive and modulation electrical signal; ES3La - Analog current signal; ES3Lb - Analog current signal; ES3Lc - Analog current signal; ES3Ld - Analog current signal;ES3Ra - Analog current signal; ES3Rb - Analog current signal; ES3Rc - Analog current signal; ES3Rd - Analog current signal; ES4La - Analog voltage signal; ES4Lb - Analog voltage signal; ES4Lc - Analog voltage signal; ES4Ld - Analog voltage signal; ES4Ra - Analog voltage signal; ES4Rb - Analog voltage signal; ES4Rc - Analog voltage signal; ES4Rd - Analog voltage signal; LSLa - Optical signal; LSLb - Optical signal; LSLc - Optical signal; LSLd - Optical signal; LSRa - Optical signal; LSRb - Optical signal; LSRc - Optical signal; LSRd - Optical signal; 11CLa - Light source; 11CLb - Light source; 11CLc - Light source; 11CLd - Light source; 11CRa - Light source; 11CRb - Light source; 11CRc - Light source; 11CRd - Light source; 17La - External optical signal modulator; 17Lb - External optical signal modulator; 17Lc - External optical signal modulator; 17Ld - External optical signal modulator; 17Ra - External optical signal modulator; 17Rb - External optical signal modulator; 17Rc - External optical signal modulator; 17Rd - External optical signal modulator; ES21La - Light source drive signal; ES21Lb - Light source drive signal; ES21Lc - Light source drive signal; ES21Ld - Light source drive signal; ES21Ra - Light source drive signal; ES21Rb - Light source drive Signals; ES21Rc - Light source drive signal; ES21Rd - Light source drive signal; ES22La - Light source modulation signal; ES22Lb - Light source modulation signal; ES22Lc - Light source modulation signal; ES22Ld - Light source modulation signal; ES22Ra - Light source modulation signal; ES22Rb - Light source modulation signal; ES22Rc - Light source modulation signal; ES22Rd - Light source modulation signal; LS0La - Continuous light wave; LS0Lb - Continuous light wave; LS0Lc - Continuous light wave; LS0Ld - Continuous light wave; LS0Ra - Continuous light wave; LS0Rb - Continuous light wave; LS0Rc - Continuous light wave; LS0Rd - Continuous light wave; 20L - Optical light connecting two signal processing units Transmission channel; 20R - Optical transmission channel connecting two signal processing units; 19L - Optical combiner; 19R - Optical combiner; 39L - Optical splitter; 39R - Optical splitter; 12L0 - Light source driver circuit; 12R0 - Light source driver circuit; 12Lma - Light source modulation circuit; 12Lmb - Light source modulation circuit; 12Lmc - Light source modulation circuit; 12Lmd - Light source modulation circuit; 12Rma - Light source modulation circuit; 12Rmb - Light source modulation circuit; 12Rmc - Light source modulation circuit; 12Rmd - Light source modulation circuit; 17mLa - External optical signal modulator for designated channel; 17mLb - External optical signal modulator for designated channel; 17mLc - External optical signal modulator for designated channel;17mLa - External optical signal modulator for specified channel; 17mRa - External optical signal modulator for specified channel; 17mRb - External optical signal modulator for specified channel; 17mRc - External optical signal modulator for specified channel; 17mRd - External optical signal modulator for specified channel; 34mLa - Detector for specified channel; 34mLa - Detector for specified channel; 34mLa - Detector for specified channel; 34mLa - Detector for specified channel; 34mLa - Detector for specified channel; 34mLa - Detector for specified channel; 34mLa - Detector for specified channel; 34mLa - Detector for specified channel; 34mRc - Detector for specified channel; 34mRd - Designated channel detector; ES1L0 - Drive analog electrical signal; ES1R0 - Drive analog electrical signal; ES1La - Modulate analog electrical signal; ES1Lb - Modulate analog electrical signal; ES1Lc - Modulate analog electrical signal; ES1Ld - Modulate analog electrical signal; ES1Ra - Modulate analog electrical signal; ES1Rb - Modulate analog electrical signal; ES1Rc - Modulate analog electrical signal; ES1Rd - Modulate analog electrical signal; ES21La - Light source drive signal; ES21Lb - Light source drive signal; ES21Lc - Light source drive signal; ES21Ld - Light source drive signal; ES21Ra - Light source drive signal; ES21Rb - Light source drive signal; ES21Rc - Light source drive signal; ES21Rd - Light source drive signal; ES22La - Light source modulation signal; ES22Lb - Light source modulation signal; ES22Lc - Light source modulation signal; ES22Ld - Light source modulation signal; ES22Ra - Light source modulation signal; ES22Rb - Light source modulation signal; ES22Rc - Light source modulation signal; ES22Rd - Light source modulation signal; LS0L - Continuous light wave; LS0R - Continuous light wave; LS0 aL - Partial continuous light wave and partial optical signal; LS0aR - Partial continuous light wave and partial optical signal; LS0abL - Partial continuous light wave and partial optical signal; LS0abR - Partial continuous light wave and partial optical signal; LS0abcL - Partial continuous light wave and partial optical signal; LS0abcR - Partial continuous light wave and partial optical signal; LSLbcd - Optical signal; LSRbcd - Optical signal; LSLcd - Optical signal; LSRcd - Optical signal; LSLd - Optical signal; LSRd - Optical signal; 11mL - Multi-channel light source; 11mR - Multi-channel light source; Detailed Implementation

[0084] The structure and technical features of this utility model are described in detail below with reference to the illustrations. The illustrations are only used to illustrate the structural relationships and related functions of this utility model. Therefore, the dimensions of each component in the illustrations are not drawn to actual proportions and are not intended to limit this utility model.

[0085] The main technical concept of this invention is as follows: the receiving end signal processing unit analyzes the signal from the transmitting end signal processing unit, extracts transmission channel information from it, forms a transmission channel information signal, and feeds this transmission channel information signal back to the transmitting end signal processing unit. The transmitting end signal processing unit adjusts its signal output based on this transmission channel information signal, thereby maintaining or improving the quality of the transmitted signal and thus maintaining or improving the communication quality between the transmitting end signal processing unit and the receiving end signal processing unit. This technology includes a system.

[0086] Figure 2 This is a schematic diagram of a first embodiment of the system for improving the quality of general communication according to this utility model. The system 100 includes a transmitting signal processing unit 100, at least one transmission channel 200 connecting two signal processing units, and at least one receiving signal processing unit 300. The transmitting signal processing unit 100 receives target transmission signals MS0 from its upper-level communication layer intended to be transmitted to each receiving signal processing unit 300, and converts each target transmission signal MS0 into a corresponding physical medium signal PS0 that can be transmitted in each transmission channel connecting two signal processing units. Each transmission channel 200 connecting two signal processing units transmits each physical medium signal PS0 to each receiving signal processing unit 300. Each receiving signal processing unit 300 receives and analyzes the physical medium signals PS0 of each transmission channel connecting two signal processing units to obtain each target transmission signal MS0 and each transmission channel information signal CS0. Each receiving signal processing unit 300 transmits each target transmission signal MS0 to its upper-level communication layer, thereby achieving the purpose of transmitting each target transmission signal MS0. Furthermore, each receiving end signal processing unit 300 transmits the transmission channel information signal CS0 of each transmission channel back to the transmitting end signal processing unit 100 at an appropriate time. The transmitting end signal processing unit 100 uses the received transmission channel information signal CS0 of each transmission channel to adjust the physical medium signal PS0 of subsequent transmission channels, thereby maintaining or improving the communication quality of each transmission channel.

[0087] The information signal CS0 of each transmission channel is not limited to electrical signals, optical signals, or electromagnetic wave signals. The transmission channel of the information signal CS0 of each transmission channel is not limited to electrical transmission channels, optical transmission channels, or electromagnetic wave transmission channels. Furthermore, the target transmission signal MS0 and the transmission channel information signal CS0 of each transmission channel are not limited to being transmitted through a fixed or specific transmission channel between two signal processing units.

[0088] Further reference Figure 2This enables the transmitting end signal processing unit 100 to generate a transmission channel quality signal QS0 based on the transmission channel information signal CS0 of each transmission channel, and transmit the transmission channel quality signal QS0 to the upper-level communication layer of the transmitting end for the upper-level network layer to perform transmission channel management and equipment management and maintenance reference.

[0089] Figure 3 This is a schematic diagram of a second embodiment of the system for improving general communication quality according to the present invention. The system 00 enables two signal processing units to transmit signals to each other through a transmission channel connecting the two signal processing units. The system 00 includes two signal processing units, signal processing unit 100L and signal processing unit 100R, with at least one transmission channel connecting the two signal processing units. Each signal processing unit includes a transmitting signal processing unit and a receiving signal processing unit. Signal processing unit 100L includes a transmitting signal processing unit 101L and a receiving signal processing unit 301R. Signal processing unit 100R includes a transmitting signal processing unit 101R and a receiving signal processing unit 301L. The transmitting signal processing unit 101L receives the target transmission signal MS0L from the upper-level communication layer of signal processing unit 100L, converts it into the physical medium signal PS0L of each transmission channel, and then transmits it to the receiving signal processing unit 301L through the transmission channels 200L connecting the two signal processing units. After the receiving end signal processing unit 301L acquires and analyzes the physical medium signal PSOL of each transmission channel, it obtains the following three types of signals.

[0090] First, the target transmission signal MS0L.

[0091] Secondly, the transmission channel information signal CS0R of each transmission channel of the signal transmitted from the transmitting end signal processing unit 101R to the receiving end processing unit 301R.

[0092] Third, analyze the physical medium signal PSOL to obtain the transmission channel information signal CSOL of each transmission channel of the signal transmitted from the transmitting end signal processing unit 101L to the receiving end processing unit 301L.

[0093] The receiving end signal processing unit 301L transmits the target transmission signal MSOL to the upper-level communication layer of the signal processing unit 100R, thereby achieving the purpose of transmitting the target transmission signal MSOL. Furthermore, it merges the transmission channel information signal CSOL and the transmission channel information signal CSOR into a transmission channel information signal CSOLR, which is then transmitted to the transmitting end signal processing unit 101R of the signal processing unit 100R.

[0094] The transmitting signal processing unit 101R adjusts the subsequently generated physical medium signal PS0R based on the transmission channel information signal CS0R, thereby maintaining or improving the communication quality of each transmission channel. Furthermore, the transmitting signal processing unit 101R receives the target transmission signal MS0R from the upper-level communication layer of the signal processing unit 100R, converts it into a physical medium signal PS0R, and transmits it to the receiving signal processing unit 301R of the signal processing unit 100L via the transmission channel 200R connecting the two signal processing units. The transmitting signal processing unit 101R also, at appropriate times, splits the transmission channel information signal CS0L and the target transmission signal MS0R together into the physical medium signal PS0R of each transmission channel, and transmits them to the receiving signal processing unit 301R of the signal processing unit 100L via the transmission channels 200R connecting the two signal processing units. Moreover, the target transmission signal MS0R and the transmission channel information signal CS0L of each transmission channel are not limited to being transmitted through a fixed or specific transmission channel.

[0095] After the receiving end signal processing unit 301R acquires and analyzes the physical medium signal PS0R of each transmission channel, it can acquire the following three types of signals, but is not limited to these.

[0096] First, the target transmission signal MS0R.

[0097] Secondly, the transmission channel information signal CS0L of each transmission channel of the signal transmitted from the transmitting end signal processing unit 101L to the receiving end processing unit 301L comes from the transmitting end signal processing unit 101R.

[0098] Third, analyze the physical medium signal PS0R to obtain the transmission channel information signal CS0R of each transmission channel of the signal transmitted from the transmitting end signal processing unit 101R to the receiving end processing unit 301R.

[0099] The receiving end signal processing unit 301R transmits the target transmission signal MS0R to the upper-level communication layer of the signal processing unit 100L, thereby achieving the purpose of transmitting the target transmission signal MS0R. Furthermore, it merges the transmission channel information signal CS0R and the transmission channel information signal CS0L into a transmission channel information signal CS0RL, which is then transmitted to the transmitting end signal processing unit 101L of the signal processing unit 100L.

[0100] The transmitting signal processing unit 101L adjusts the subsequently generated physical medium signal PSOL based on the transmission channel information signal CS0L, thereby maintaining or improving the communication quality of each transmission channel. Furthermore, the transmitting signal processing unit 101L receives the target transmission signal MS0L from the upper-level communication layer of the signal processing unit 100L, converts it into a physical medium signal PSOL, and transmits it to the receiving signal processing unit 301L of the signal processing unit 100R through the transmission channel 200L connecting the two signal processing units. The transmitting signal processing unit 101L also, at appropriate times, splits the transmission channel information signal CS0R and the target transmission signal MS0L together into the physical medium signal PSOL of each transmission channel, and transmits them to the receiving signal processing unit 301L of the signal processing unit 100R through the transmission channels 200L connecting the two signal processing units. Moreover, the target transmission signal MS0L and the transmission channel information signal CS0R of each transmission channel are not limited to being transmitted through a fixed or specific transmission channel.

[0101] The signal processing unit 100L and the signal processing unit 100R can transmit signals bidirectionally through the same transmission channel connecting the two signal processing units. That is, the transmission channel 200L connecting the two signal processing units and the transmission channel 200R connecting the two signal processing units can be the same entity. In other words, the entity of the transmission channel 200L connecting the two signal processing units and the transmission channel 200R connecting the two signal processing units is a common transmission channel.

[0102] Figure 4This is a schematic diagram of a first embodiment of the system for improving optical communication quality according to this utility model. Each transmission channel connecting two signal processing units in this system is an optical transmission channel. System 1 includes a transmitting signal processing unit 10, at least one optical transmission channel 20 connecting two signal processing units, and at least one receiving signal processing unit 30. The transmitting signal processing unit 10 further includes a signal output and control circuit 13, at least one optical signal driving and modulation circuit 12, and at least one electrical signal to optical signal conversion unit 110. The signal output and control circuit 13 is used to receive the target transmission signal MS from the upper-level network layer of the transmitting signal processing unit 10 and the transmission channel information signals CS from the transmitting signal processing unit 30, and converts the target transmission signal MS into analog electrical signals ES1 output to the optical signal driving and modulation circuits of each transmission channel according to the transmission channel information signals CS. The optical signal driving and modulation circuit 12 of each transmission channel is used to convert the analog electrical signal ES1 from each transmission channel of the signal output and control circuit 13 into a light source driving and modulation electrical signal ES20 provided to each electrical signal to optical signal unit 110. Each electrical signal to optical signal unit 110 is used to convert the light source driving and modulation electrical signal ES20 from each transmission channel of the optical signal driving and modulation circuit 12 into an optical signal LS for each transmission channel, and transmit it to the optical transmission channel 20 of each transmission channel.

[0103] Each optical transmission channel 20, which connects two signal processing units, is used to transmit optical signals LS from each transmission channel of the transmitting signal processing unit 10 to the receiving signal processing unit 30.

[0104] Each receiver signal processing unit 30 includes at least one optical signal to electrical signal unit 340, at least one transimpedance amplifier 35, and a signal input and control circuit 36. Each optical signal to electrical signal unit 340 converts the optical signal LS of each transmission channel into an analog current signal ES3 for that transmission channel. Each transimpedance amplifier 35 of each transmission channel converts the analog current signal ES3 from each optical signal to electrical signal unit 340 into an analog voltage signal E4 for that transmission channel and transmits it to the signal input and control circuit 36. Each signal input and control circuit 36 ​​analyzes the received analog voltage signal E4 of each transmission channel to obtain the target transmission signal MS and the transmission channel information CS. Each signal input and control circuit 36 ​​also transmits the target transmission signal MS to the upper-level communication layer of each receiver, thereby achieving the purpose of transmitting the target transmission signal MS. Each signal input and control circuit 36 ​​uses the acquired transmission channel information to form a transmission channel information signal CS for each transmission channel, and transmits the transmission channel information signal CS of each transmission channel back to the signal output and control circuit 13 of the transmitting end signal processing unit 10 at an appropriate time, in a manner not limited to using a fixed or specific transmission channel. The signal output and control circuit 13 can adjust the analog electrical signal ES1 subsequently provided to the optical signal driving and modulation circuit 12 of each transmission channel according to the transmission channel information signal CS of each transmission channel, thereby maintaining or improving the communication quality of each transmission channel.

[0105] refer to Figure 4 To further explain the function of the signal output and control circuit 13, it includes, but is not limited to, a combination of at least one of the following groups:

[0106] First, it receives the target transmission signal MS from the upper-level communication layer's transmitting signal processing unit, which intends to transmit it to each receiving signal processing unit.

[0107] Secondly, the analog electrical signal ES1 of each transmission channel is output to each optical signal driving and modulation circuit 12.

[0108] Third, acquire and store the information of the DC bias electrical signal analog level of the electrical signal to optical signal unit 110 corresponding to the electrical signal of each transmission channel in the analog electrical signal ES1 representing each transmission channel.

[0109] Fourth, acquire and store the AC modulation signal information of the analog electrical signal ES1 representing each transmission channel, which corresponds to the electrical signal to optical signal unit 110 of that transmission channel.

[0110] Fifth, information on the modulated analog signal level of the electrical signal-to-optical signal unit 110 corresponding to the digital signal digits of each transmission channel in the analog electrical signal ES1 representing each transmission channel is obtained and stored.

[0111] Sixth, it receives the transmission channel information signals CS from each receiving end signal processing unit 30.

[0112] Seventh, adjust the analog electrical signal ES1 of each transmission channel according to the information signal CS of each transmission channel to improve the quality of each transmission channel.

[0113] Eighth, acquire and store the time-domain signal f representing the analog electrical signal ES1 of each transmission channel in a certain time interval τ. in (t), or its spectral signal F in Information about (ω).

[0114] Ninth, the analog voltage signal ES4 of each transmission channel corresponding to the time period τ is obtained from the information signal CS of each transmission channel. out (t), or its spectral signal F out Information about (ω).

[0115] Tenth, analyze and obtain the frequency response of each transmission channel.

[0116] Eleventh, based on the frequency response of each transmission channel Adjust the analog electrical signal ES1 of each transmission channel to improve the quality of each transmission channel.

[0117] Twelfth, the quality of each transmission channel is determined based on the CS information signal of each transmission channel. If the quality of the transmission channel is within an acceptable range, signal transmission on that channel continues. If the quality of the transmission channel is not within an acceptable range, the abnormality is reported to the upper-level communication layer via the transmission channel quality signal QS for reference in transmission channel management and equipment management and maintenance.

[0118] Thirteenth, based on the frequency response F of each transmission channel C (ω) Determine the quality of the transmission channel. If the quality of the transmission channel is within acceptable limits, continue signal transmission through the channel. If the quality of the transmission channel is not within acceptable limits, notify the upper-level communication layer of this anomaly via the transmission channel quality signal QS for reference in transmission channel management and equipment maintenance.

[0119] Fourteenth, in the transmission channel calibration and optimization procedure, compare the real-time transmission channel information signal CS. r With appropriate transmission channel information signal CS i If the difference between the two is within an acceptable range, the comparison result is used to adjust the analog electrical signal ES1. If there is a significant difference, the transmission channel quality signal QS is used to notify the upper-level communication layer of this anomaly, so as to serve as a reference for transmission channel management and equipment management and maintenance.

[0120] Fifteenth, in the transmission channel calibration optimization procedure, compare the instantaneous frequency response F. C_r (ω) and appropriate frequency response F C_i (ω). If the difference between the two is still within an acceptable range, the signal transmission of the transmission channel continues. If there is a significant difference, the abnormality is reported to the upper communication layer through the transmission channel quality signal QS, so as to serve as a reference for transmission channel management and equipment management and maintenance.

[0121] Sixteenth, a quality signal (QS) is generated to transmit the quality status of each transmission channel to the upper-level communication layer for reference in transmission channel management and equipment management and maintenance.

[0122] refer to Figure 4 The functions of each signal input and control circuit 36 ​​are further described, and each circuit includes, but is not limited to, a combination of at least one of the following groups:

[0123] First, it receives analog voltage signals ES4 from the transimpedance amplifiers 35 of each transmission channel, and analyzes each analog voltage signal ES4 to obtain the target transmission signal MS that the transmitting end signal processing unit wants to transmit to the receiving end signal processing unit and the transmission channel information signal CS of each transmission channel.

[0124] Secondly, the target transmission signal MS that the transmitting end signal processing unit wants to transmit to the receiving end signal processing unit is transmitted to the upper-level communication layer.

[0125] Third, the transmission channel information signal CS of each transmission channel is fed back to the signal output and control circuit 13 of the transmitting end signal processing unit 10 in the form of an electrical signal or an optical signal.

[0126] The signal output and control circuit 13 of the transmitting end signal processing unit 10 can further form a transmission channel quality signal QS based on the transmission channel information signal CS of each transmission channel, and transmit the transmission channel quality signal QS to the upper-level communication layer of the transmitting end for the upper-level network layer to refer to for transmission channel management and equipment management and maintenance.

[0127] Figure 5This is a schematic diagram of a second embodiment of the system for improving optical communication quality according to this utility model. The signal processing, monitoring, and control methods of this system 1 are the same as those of the first embodiment of the system for improving optical communication quality. This system 1 uses external modulation to generate the optical signal LS. Therefore, each electrical signal to optical signal unit 110 in the first embodiment of the system for improving optical communication quality includes a light source 11C and an external optical signal modulator 17. The optical signal driving and modulation circuit 12 of each transmission channel outputs a light source driving electrical signal ES21 to drive each light source 11C to generate a continuous light wave LS0, and outputs a light source modulation electrical signal ES22 to each external optical signal modulator 17. The external optical signal modulator 17 of each transmission channel modulates the continuous light wave LS0 on the optical path into the optical signal LS according to the light source modulation electrical signal ES22 received from the optical signal driving and modulation circuit 12. Furthermore, the functions of each signal output and control circuit 13, each optical transmission channel 20, each optical signal to electrical signal unit 340, each transimpedance amplifier 35, and each signal input and control circuit 36 ​​in this example are the same as those in the first embodiment of the system for improving optical communication quality.

[0128] Figure 6This is a schematic diagram of a third embodiment of the system for improving optical communication quality according to the present invention. In this example, one signal processing unit 10L and another signal processing unit 10R transmit signals to each other through a single common optical transmission channel 20. That is, when signal processing unit 10L transmits a signal to signal processing unit 10R, signal processing unit 10L corresponds to the transmitting end signal processing unit 10 of the first embodiment of the system for improving optical communication quality, signal processing unit 10R corresponds to the receiving end signal processing unit 30 of the first embodiment of the system for improving optical communication quality, target transmission signal MSL corresponds to the target transmission signal MS of the first embodiment of the system for improving optical communication quality, optical signal LSL corresponds to the optical signal LS of the first embodiment of the system for improving optical communication quality, analog electrical signal ES1L corresponds to the analog electrical signal ES1 of the first embodiment of the system for improving optical communication quality, light source driving and modulation electrical signal ES2L corresponds to the light source driving and modulation electrical signal ES2 of the first embodiment of the system for improving optical communication quality, analog current signal ES3L corresponds to the analog current signal ES3 of the first embodiment of the system for improving optical communication quality, analog voltage signal ES4L corresponds to the analog voltage signal ES4 of the first embodiment of the system for improving optical communication quality, and transmission channel information signal CSL corresponds to the system for improving optical communication quality. The transmission channel information signal CS and transmission channel quality signal QSL in the first embodiment of the system correspond to the transmission channel quality signal QS in the first embodiment of the system for improving optical communication quality. The signal output and control circuit 13L corresponds to the signal output and control circuit 13 in the first embodiment of the system for improving optical communication quality. The optical signal driving and modulation circuit 12L corresponds to the optical signal driving and modulation circuit 12 in the first embodiment of the system for improving optical communication quality. The light source 11L corresponds to the electrical signal to optical signal unit 110 in the first embodiment of the system for improving optical communication quality. The detector 34L corresponds to the optical signal to electrical signal unit 34 in the first embodiment of the system for improving optical communication quality. The transimpedance amplifier 35L corresponds to the transimpedance amplifier 35 in the first embodiment of the system for improving optical communication quality. The signal input and control circuit 36L corresponds to the signal input and control circuit 36 ​​in the first embodiment of the system for improving optical communication quality. The optical channel from the optical plug multiplexer 18L to the optical plug multiplexer 18R via the optical channel 20 corresponds to the optical channel 20 in the first embodiment of the system for improving optical communication quality.Similarly, when signal processing unit 10R transmits a signal to signal processing unit 10L, signal processing unit 10R corresponds to the transmitting end signal processing unit 10 of the first embodiment of the system for improving optical communication quality, signal processing unit 10L corresponds to the receiving end signal processing unit 30 of the first embodiment of the system for improving optical communication quality, optical signal LSR corresponds to the optical signal LS of the first embodiment of the system for improving optical communication quality, analog electrical signal ES1R corresponds to the analog electrical signal ES1 of the first embodiment of the system for improving optical communication quality, light source driving and modulation electrical signal ES2R corresponds to the light source driving and modulation electrical signal ES2 of the first embodiment of the system for improving optical communication quality, analog current signal ES3R corresponds to the analog current signal ES3 of the first embodiment of the system for improving optical communication quality, analog voltage signal ES4R corresponds to the analog voltage signal ES4 of the first embodiment of the system for improving optical communication quality, and transmission channel information signal CSR corresponds to the transmission channel information signal CS of the first embodiment of the system for improving optical communication quality. The transmission channel quality signal QSR corresponds to the transmission channel quality signal QS in the first embodiment of the system for improving optical communication quality. The signal output and control circuit 13R corresponds to the signal output and control circuit 13 in the first embodiment of the system for improving optical communication quality. The optical signal driving and modulation circuit 12R corresponds to the optical signal driving and modulation circuit 12 in the first embodiment of the system for improving optical communication quality. The light source 11R corresponds to the electrical signal to optical signal unit 110 in the first embodiment of the system for improving optical communication quality. The optical detector 34R corresponds to the optical signal to electrical signal unit 340 in the first embodiment of the system for improving optical communication quality. The transimpedance amplifier 35R corresponds to the transimpedance amplifier 35 in the first embodiment of the system for improving optical communication quality. The signal input and control circuit 36R corresponds to the signal input and control circuit 36 ​​in the first embodiment of the system for improving optical communication quality. The optical channel from the optical plug multiplexer 18R to the optical plug multiplexer 18L via the optical channel 20 corresponds to the optical channel 20 in the first embodiment of the system for improving optical communication quality.

[0129] refer to Figure 6The optical signal LSL generated by one of the electrical signal to optical signal units 11L in the signal processing unit 10L has different wavelength or polarization characteristics from the optical signal LSL generated by one of the electrical signal to optical signal units 11R on the signal processing unit 10R that share the common optical transmission channel 20. For example, the wavelength of the optical signal LSL generated by the electrical signal to optical signal unit 11L in the signal processing unit 10L is different from the wavelength of the optical signal LSL generated by the electrical signal to optical signal unit 11R on the signal processing unit 10R, or the polarization of the optical signal LSL generated by the electrical signal to optical signal unit 11L in the signal processing unit 10L is orthogonal to the polarization of the optical signal LSL generated by the electrical signal to optical signal unit 11R on the signal processing unit 10R. Furthermore, the signal processing unit 10L includes an optical plug-in multiplexer 18L that allows the optical signal LSL from the electrical signal to optical signal unit 11L of the signal processing unit 10L to enter the common optical transmission channel 20 and be transmitted to the signal processing unit 10R, while simultaneously allowing the optical signal LSR from the optical transmission channel 20 to be transmitted to an optical signal to electrical signal unit 34R of the signal processing unit 10L. Similarly, the optical plug-in multiplexer 18R of the signal processing unit 10R allows the optical signal LSR from the light source 11R of the signal processing unit 10R to enter the optical transmission channel 20 and be transmitted to the signal processing unit 10L, while simultaneously allowing the optical signal LSL from the optical transmission channel 20 to be transmitted to an optical signal to electrical signal unit 34L of the signal processing unit 10R.

[0130] refer to Figure 6In the signal processing unit 10L, the transmission channel information signal CSRL transmitted from the signal input and control circuit 36R to the signal output and control circuit 13L includes the transmission channel information signal CSL from the signal processing unit 10L to the signal processing unit 10R and the transmission channel information signal CSR from the signal processing unit 10R to the signal processing unit 10L. After acquiring the transmission channel information signals CSL and CSR, the signal output and control circuit 13L analyzes the transmission channel information signal CSL and uses the analysis result to adjust the analog electrical signal ES1L to maintain or improve the transmission channel signal quality from the signal processing unit 10L to the signal processing unit 10R. It also uses the analysis result to form a channel quality information signal QSL and transmits this QSL to the upper-level network layer for reference in transmission channel management and equipment maintenance. The signal output and control circuit 13L loads the acquired transmission channel information signal CSR into the analog electrical signal ES1L at an appropriate time and transmits it to the signal processing unit 10R. Similarly, in the signal processing unit 10R, the transmission channel information signal CSLR transmitted from the signal input and control circuit 36L to the signal output and control circuit 13R includes the transmission channel information signal CSR and the transmission channel information signal CSL. After acquiring the transmission channel information signal CSR and the transmission channel information signal CSL, the signal output and control circuit 13R analyzes the transmission channel information signal CSR and uses the analysis result to adjust the analog electrical signal ES1R to maintain or improve the transmission channel signal quality from the signal processing unit 10R to the signal processing unit 10L. The analysis result is used to form a channel quality information signal QSR, which is then transmitted to the upper-level network layer for reference in transmission channel management and equipment management and maintenance. The signal output and control circuit 13R loads the acquired transmission channel information signal CSL into the analog electrical signal ES1R at an appropriate time and transmits it to the signal processing unit 10L.

[0131] refer to Figure 6 Taking the signal transmission channel from signal processing unit 10L to signal processing unit 10R as an example, the functions of signal output and control circuits 13L and 13R in this embodiment will be explained as follows. The function of the signal output and control circuit 13L of signal processing unit 10L may include a combination of at least one of the following groups, but is not limited thereto:

[0132] First, it receives the target transmission signal MSL from the upper-level communication layer, which the signal processing unit 10L wants to transmit to the signal processing unit 10R.

[0133] Secondly, it receives the transmission channel information signal CSRL from the signal input and control circuit 36R of the transmitting end processing unit 10L. It then analyzes the transmission channel information signal CSRL to obtain the transmission channel information signals CSR and CSL respectively.

[0134] Third, the target transmission signal MSL and the transmission channel information signal CSR are combined to form the signal transmitted by the signal processing unit 10L to the signal processing unit 10R.

[0135] Fourth, the signal processing unit 10L converts the signals MSL and CSR transmitted by the signal processing unit 10L into analog electrical signals ES1L and outputs them to the optical signal driving and modulation circuit 12L.

[0136] Fifth, acquire and store the information of the analog DC bias electrical signal level corresponding to the light source 11L in the analog electrical signal ES1L.

[0137] Sixth, acquire and store the information of the AC modulated electrical signal corresponding to the light source 11L in the analog electrical signal ES1L.

[0138] Seventh, acquire and store the analog signal level information of each corresponding digital signal digit in the analog electrical signal ES1L that corresponds to the light source 11L.

[0139] Eighth, acquire and store the time-domain signal f of the analog electrical signal ES1L within a certain time interval τ. in_L (t), or its spectral signal F in_L Information about (ω).

[0140] Ninth, the time-domain signal f corresponding to the analog voltage signal ES4L in the aforementioned time period τ is obtained and stored from the transmission channel information signal CSL. out_L (t), or its spectral signal F out_L Information about (ω).

[0141] Tenth, analyze and obtain the frequency response of the transmission channel from the signal processing unit 10L to the signal processing unit 10R.

[0142] Eleventh, adjust the analog electrical signal ES1 of each transmission channel according to the information signal CSL of each transmission channel to improve the quality of each transmission channel.

[0143] Twelfth, based on the frequency response F of each transmission channel C_L (ω) Adjust the analog electrical signal ES1 of each transmission channel to improve the quality of each transmission channel.

[0144] Thirteenth, the quality of each transmission channel is determined based on the CSL (Content Score) of each transmission channel. If the quality of the transmission channel is within acceptable limits, signal transmission on that channel continues. If the quality of the transmission channel is not within acceptable limits, the abnormality is reported to the upper-level communication layer via the QSL (Quality Score) for reference in transmission channel management and equipment maintenance.

[0145] Fourteenth, based on the frequency response F of each transmission channel C_L (ω) Determine the quality of the transmission channel. If the quality of the transmission channel is within acceptable limits, continue signal transmission through that channel. If the quality of the transmission channel is not within acceptable limits, notify the upper-level communication layer of this anomaly via the transmission channel quality signal QSL for reference in transmission channel management and equipment maintenance.

[0146] Fifteenth, in the transmission channel calibration optimization procedure, compare the real-time transmission channel information signal CSL. r With appropriate transmission channel information signal CSL i If the difference between the two is within an acceptable range, the comparison result is used to adjust the analog electrical signal ES1. If there is a significant difference, the transmission channel quality signal QSL is used to notify the upper-level communication layer of this anomaly, so as to serve as a reference for transmission channel management and equipment management and maintenance.

[0147] Sixteenth, in the transmission channel calibration optimization procedure, compare the instantaneous frequency response F. C_L_r (ω) and appropriate frequency response F C_L_i (ω). If the difference between the two is still within an acceptable range, the signal transmission of the transmission channel continues. If there is a significant difference, the abnormality is reported to the upper communication layer through the transmission channel quality signal QSL for reference in transmission channel management and equipment management and maintenance.

[0148] Seventeenth, a Quality Signal (QSL) is generated to transmit the quality status of each transmission channel to the upper-level communication layer for reference in transmission channel management and equipment management and maintenance.

[0149] refer to Figure 6 Taking the signal transmission channel from signal processing unit 10L to signal processing unit 10R as an example, the functions of signal input and control circuits 36L and 36R in this embodiment are explained as follows. The function of signal input and control circuit 36L of signal processing unit 10R may include:

[0150] First, it receives an analog voltage signal ES4L from a transimpedance amplifier 35L of the signal processing unit 10R, and analyzes the analog voltage signal ES4L to obtain a target transmission signal MSL, a transmission channel information signal CSL, and a transmission channel information signal CSR that the signal processing unit 10L wants to transmit to the signal processing unit 10R.

[0151] Secondly, the target transmission signal MSL that the signal processing unit 10L wants to transmit to the signal processing unit 10R is transmitted to the upper-level communication layer.

[0152] Third, the transmission channel information signal CSL and the transmission channel information signal CSR are transmitted to the signal output and control circuit 13R of the signal processing unit 10R.

[0153] refer to Figure 6 Similarly, the functions of the signal output and control circuit 13R and the signal input and control circuit 35R of the channel through which the signal processing unit 10R transmits signals to the signal processing unit 10L can be understood from the above.

[0154] Figure 7This is a schematic diagram of the fourth embodiment of the system for improving optical communication quality according to this utility model. The signal processing, monitoring, and control methods in this embodiment are the same as those in the third embodiment of the system for improving optical communication quality; however, this embodiment uses external modulation to generate optical signals LSL and LSR. Therefore, in the signal processing unit 10L, a light source 11CL and an external optical signal modulator 17L are combined to form an electrical signal to optical signal unit 110 as in the first embodiment of the system for improving optical communication quality. Similarly, in the signal processing unit 10R, a light source 11CR and an external optical signal modulator 17R are combined to form an electrical signal to optical signal unit 110 as in the first embodiment of the system for improving optical communication quality. In the signal processing unit 10L, an optical signal driving and modulation circuit 12L outputs a light source driving signal ES21L to the light source 11CL, causing the light source 11CL to generate a continuous light wave LS0L. Simultaneously, it outputs a light source modulation signal ES22L to an external optical signal modulator 17L, causing the external optical signal modulator 17L to modulate the continuous light wave LS0L into an optical signal LSL. Similarly, in the signal processing unit 10R, an optical signal driving and modulation circuit 12R outputs a light source driving signal ES21R to the light source 11CR, causing the light source 11CR to generate a continuous light wave LS0R. Simultaneously, it outputs a light source modulation signal ES22R to an external optical signal modulator 17R, causing the external optical signal modulator 17R to modulate the continuous light wave LS0R into an optical signal LSR. Furthermore, in this embodiment, the signal output and control circuits 13L and 13R, the signal input and control circuits 36L and 36R, the optical plug multiplexers 18L and 18R, the optical detectors 34L and 34R, and the transimpedance amplifiers 35L and 35R all have the same functions as the corresponding components in the third embodiment of the system for improving optical communication quality.

[0155] Figure 8 This is a schematic diagram of a fifth embodiment of the system for improving optical communication quality according to the present invention. In this example, one signal processing unit 10L and another signal processing unit 10R transmit signals to each other through several optical transmission channels. Specifically, the signal processing unit 10L transmits signals to the signal processing unit 10R through several transmission channels, where each transmission channel corresponds to one optical transmission channel. Figure 8 The diagram shows four optical transmission channels: 20La, 20Lb, 20Lc, and 20Ld (but this illustration does not limit the number of optical transmission channels in this embodiment). The signal processing unit 10R transmits signals to the signal processing unit 10L through several other transmission channels, with each transmission channel corresponding to one optical transmission channel.

[0156] refer to Figure 8In the signal processing unit 10L, the transmission channel information signal CSRL transmitted from the signal input and control circuit 36R to the signal output and control circuit 13L includes the transmission channel information signals CSLa, CSLb, CSLc, and CSLd of each transmission channel from the signal processing unit 10L to the signal processing unit 10R, and the transmission channel information signals CSRa, CSRb, CSRc, and CSRd of each transmission channel from the signal processing unit 10R to the signal processing unit 10L. After acquiring the individual transmission channel information signals CSLa, CSLb, CSLc, CSLd, CSRa, CSRb, CSRc, and CSRd, the signal output and control circuit 13L analyzes the transmission channel information signals CSLa, CSLb, CSLc, and CSLd. Using the analysis results, it adjusts the corresponding analog electrical signals ES1La, ES1Lb, ES1Lc, and ES1Ld to maintain or improve the signal quality of each transmission channel from the signal processing unit 10L to the signal processing unit 10R. The analysis results are then used to form a channel quality information signal QSL containing the quality information of each transmission channel from the signal processing unit 10L to the signal processing unit 10R. This channel quality information signal QSL is then transmitted to the upper-level network layer for reference in transmission channel management and equipment maintenance. The signal output and control circuit 13L transmits the acquired transmission channel information signals CSRa, CSRb, CSRc, and CSRd of each transmission channel to the analog electrical signals ES1La, ES1Lb, ES1Lc, and ES1Ld of each transmission channel at an appropriate time, regardless of whether the transmission channel is fixed or specific, to the signal processing unit 10R. Similarly, in the signal processing unit 10R, the transmission channel information signal CSLR transmitted from the signal input and control circuit 36L to the signal output and control circuit 13R includes the transmission channel information signals CSRa, CSRb, CSRc, and CSRd of each transmission channel from the signal processing unit 10R to the signal processing unit 10L, and the transmission channel information signals CSLa, CSLb, CSLc, and CSLd of each transmission channel from the signal processing unit 10L to the signal processing unit 10R.After acquiring the individual transmission channel information signals CSLa, CSLb, CSLc, CSLd, CSRa, CSRb, CSRc, and CSRd, the signal output and control circuit 13R analyzes the transmission channel information signals CSRa, CSRb, CSRc, and CSRd. The analysis results are then used to adjust the corresponding analog electrical signals ES1Ra, ES1Rb, ES1Rc, and ES1Rd to maintain or improve the signal quality of each transmission channel from the signal processing unit 10R to the signal processing unit 10L. The analysis results are then used to form a channel quality information signal QSR containing the quality information of each transmission channel from the signal processing unit 10R to the signal processing unit 10L. This channel quality information signal QSR is then transmitted to the upper-level network layer for reference in transmission channel management and equipment maintenance. The signal output and control circuit 13R loads the acquired transmission channel information signals CSLa, CSLb, CSLc, and CSLd of each transmission channel into the analog electrical signals ES1Ra, ES1Rb, ES1Rc, and ES1Rd of each transmission channel at an appropriate time, regardless of whether the transmission channel is fixed or specific, and transmits them to the signal processing unit 10L.

[0157] refer to Figure 8 Taking the signal transmission channel from signal processing unit 10L to signal processing unit 10R as an example, the functions of signal output and control circuits 13L and 13R in this embodiment will be explained as follows. The function of the signal output and control circuit 13L of signal processing unit 10L may include a combination of at least one of the following groups, but is not limited thereto:

[0158] First, it receives the target transmission signal MSL from the signal processing unit 10L of the upper communication layer, which is intended to be transmitted to the signal processing unit 10R.

[0159] Secondly, it receives the transmission channel information signal CSRL from a signal input and control circuit 36R of the signal processing unit 10L, and analyzes the transmission channel information signal CSRL to obtain individual transmission channel information signals CSLa, CSLb, CSLc, CSLd, CSRa, CSRb, CSRc, and CSRd.

[0160] Third, the target transmission signal MSL and the transmission channel information signals CSRa, CSRb, CSRc, and CSRd are combined to form the signal transmitted by the signal processing unit 10L to the signal processing unit 10R.

[0161] Fourth, the digital signals transmitted by the signal processing unit 10L to the signal processing unit 10R are split and converted into analog electrical signals ES1La, ES1Lb, ES1Lc, and ES1Ld corresponding to each transmission channel, and then transmitted to the optical signal driving and modulation circuits 12La, 12Lb, 12Lc, and 12Ld corresponding to each transmission channel.

[0162] Fifth, acquire and store the information of the DC bias electrical signal analog level corresponding to the light source 11La, 11Lb, 11Lc, and 11Ld in the analog electrical signals ES1La, ES1Lb, ES1Lc, and ES1Ld of each transmission channel.

[0163] Sixth, acquire and store the AC modulated electrical signals corresponding to the light sources 11La, 11Lb, 11Lc, and 11Ld in the analog electrical signals ES1La, ES1Lb, ES1Lc, and ES1Ld of each transmission channel.

[0164] Seventh, acquire and store the analog signal level information of the corresponding digital signals of the light sources 11La, 11Lb, 11Lc, and 11Ld in the analog electrical signals ES1La, ES1Lb, ES1Lc, and ES1Ld of each transmission channel.

[0165] Eighth, acquire and store the individual time-domain signals f of the analog electrical signals ES1La, ES1Lb, ES1Lc, and ES1Ld within a certain time interval τ. in_L_a (t), f in_L_b (t), f in_L_c (t), f in_L_d (t), or its spectral signal F in_L_a (ω), F in_L_b (ω), F in_L_c (ω), F in_L_d Information about (ω).

[0166] Ninth, obtain the individual time-domain signals f from the analog voltage signals ES4La, ES4Lb, ES4Lc, and ES4Ld corresponding to each transmission channel in the aforementioned time interval τ from the transmission channel information signals CSLa, CSLb, CSLc, and CSLd. out_L_a (t), f out_L_b (t), f out_L_c (t), f out_L_d (t) or the corresponding spectral signal F out_L_a (ω), F out_L_b (ω), F out_L_c (ω), F out_L_d (ω).

[0167] Tenth, analyze the frequency response of each transmission channel from the signal processing unit 10L to the signal processing unit 10R.

[0168] Eleventh, based on the transmission channel information signals CSLa, CSLb, CSLc, and CSLd of each transmission channel, the analog electrical signals ES1La, ES1Lb, ES1Lc, and ES1Ld of each transmission channel are adjusted respectively to improve the quality of each transmission channel.

[0169] Twelfth, based on the frequency response F of each transmission channel C_L_a (ω), F C_L_b (ω), F C_L_c (ω), F C_L_d (ω) Adjust the analog electrical signals ES1La, ES1Lb, ES1Lc, and ES1Ld of each transmission channel to improve the quality of each transmission channel.

[0170] Thirteenth, the quality of each transmission channel is determined based on the transmission channel information signals CSLa, CSLb, CSLc, and CSLd. If the quality of the transmission channel is within acceptable limits, signal transmission continues on that channel. If the quality of the transmission channel is outside acceptable limits, the abnormality is reported to the higher-level communication layer via the transmission channel quality signal QSL for reference in transmission channel management and equipment maintenance.

[0171] Fourteenth, based on the frequency response F of each transmission channel C_L_a (ω), F C_L_b (ω), F C_L_c (ω), F C_L_d (ω) Determine the quality of the transmission channel. If the quality of the transmission channel is within acceptable limits, continue signal transmission through that channel. If the quality of the transmission channel is not within acceptable limits, notify the upper-level communication layer of this anomaly via the transmission channel quality signal QSL for reference in transmission channel management and equipment maintenance.

[0172] Fifteenth, in the transmission channel calibration and optimization procedure, the real-time transmission channel information signal CSLa of each transmission channel is compared respectively. r CSLb r ,CSLc r ,CSLd r With appropriate transmission channel information signal CSLa i CSLb i ,CSLc i ,CSLd iIf the difference between the two is still within an acceptable range, signal transmission on that channel will continue. If there is a significant difference, the abnormality will be reported to the upper-level communication layer via the Transmission Channel Quality Signal (QSL) for reference in transmission channel management and equipment maintenance.

[0173] Sixteenth, in the transmission channel calibration optimization procedure, compare the instantaneous frequency response F of each transmission channel. C_L_a_r (ω), F C_L_b_r (ω), F C_L_c_r (ω), F C_L_d_r (ω) and appropriate frequency response F C_L_a_i (ω), F C_L_b_i (ω), F C_L_c_i (ω), F C_L_d_i (ω). If the difference between the two is still within an acceptable range, the signal transmission of the transmission channel continues. If there is a significant difference, the abnormality is reported to the upper communication layer through the transmission channel quality signal QSL for reference in transmission channel management and equipment management and maintenance.

[0174] Seventeenth, the Quality Signal (QSL) is generated to transmit the transmission channel quality status of each transmission channel to the upper-level communication layer for reference in transmission channel management and equipment management and maintenance.

[0175] refer to Figure 8 Taking the signal transmission channel from signal processing unit 10L to signal processing unit 10R as an example, the functions of signal input and control circuits 36L and 36R in this embodiment are explained as follows. The function of the signal input and control circuit 36L of the signal processing unit 10R may include a combination of at least one of the following groups, but is not limited thereto:

[0176] First, the analog voltage signals ES4La, ES4Lb, ES4Lc, and ES4Ld from the transimpedance amplifiers 35La, 35Lb, 35Lc, and 35Ld of each transmission channel of the signal processing unit 10R are received, and each analog voltage signal ES4La, ES4Lb, ES4Lc, and ES4Ld is analyzed to obtain the target transmission signal MSL that the signal processing unit 10L wants to transmit to the signal processing unit 10R and the transmission channel information signals CSLa, CSLb, CSLc, CSLd, CSRa, CSRb, CSRc, and CSRd of each transmission channel.

[0177] Secondly, the target transmission signal MSL that the signal processing unit 10L wants to transmit to the signal processing unit 10R is transmitted to the upper-level communication layer.

[0178] Third, the transmission channel information signals CSLa, CSLb, CSLc, CSLd, CSRa, CSRb, CSRc, and CSRd of each transmission channel are transmitted to the signal output and control circuit 13R of the signal processing unit 10R.

[0179] refer to Figure 8 Similarly, the functions of the signal output and control circuit 13R and the signal input and control circuit 36R of the channel through which the signal processing unit 10R transmits signals to the signal processing unit 10L can be understood.

[0180] refer to Figure 8 Furthermore, the functions of the optical signal driving and modulation circuits 12La, 12Lb, 12Lc, 12Ld, 12Ra, 12Rb, 12Rc, 12Rd in each transmission channel, the detectors 34La, 34Lb, 34Lc, 34Ld, 34Ra, 34Rb, 34Rc, 34Rd, and the transimpedance amplifiers 35La, 35Lb, 35Lc, 35Ld, 35Ra, 35Rb, 35Rc, 35Rd are the same as the functions of the corresponding components in the third embodiment of the system for improving optical communication quality.

[0181] Figure 9 This is a schematic diagram of the sixth embodiment of the system for improving optical communication quality according to this utility model. The signal processing, monitoring, and control methods in this embodiment are the same as those in the fifth embodiment of the system for improving optical communication quality. However, this embodiment uses external modulation to generate optical signals LSLa, LSLb, LSLc, LSLd and optical signals LSRa, LSRb, LSRc, LSRd. Therefore, in this embodiment, one light source 11CLa and one external optical signal modulator 17La, one light source 11CLb and one external optical signal modulator 17Lb, one light source 11CLc and one external optical signal modulator 17Lc, and one light source 11CLd and one external optical signal modulator 17Ld in the signal processing unit 10L are respectively combined to form a total of four electrical signal to optical signal units 110 in the first embodiment of the system for improving optical communication quality. Similarly, in the signal processing unit 10R, a light source 11CRa is combined with an external optical signal modulator 17Ra, a light source 11CRb is combined with an external optical signal modulator 17Rb, a light source 11CRc is combined with an external optical signal modulator 17Rc, and a light source 11CRd is combined with an external optical signal modulator 17Rd to form four other electrical signal to optical signal units 110 in the first embodiment of the system for improving optical communication quality.

[0182] refer to Figure 9In the signal processing unit 10L, the optical signal driving and modulation circuits 12La, 12Lb, 12Lc, and 12Ld of each transmission channel output light source driving electrical signals ES21La, ES21Lb, ES21Lc, and ES21Ld respectively to each light source 11CLa, 11CLb, 11CLc, and 11CLd corresponding to the transmission channel, so that each light source 11CLa, 11CLb, 11CLc, and 11CLd generates continuous light waves LS0La, LS0Lb, and LS0 respectively. Lc, LS0Ld, and on the other hand, the external optical signal modulators 17La, 17Lb, 17Lc, 17Ld corresponding to the transmission channel output light source modulation electrical signals ES22La, ES22Lb, ES22Lc, ES22Ld respectively, so that the external optical signal modulators 17La, 17Lb, 17Lc, 17Ld modulate the continuous light waves LS0La, LS0Lb, LS0Lc, LS0Ld into optical signals LSLa, LSLb, LSLc, LSLd respectively. Similarly, in the signal processing unit 10R, the optical signal driving and modulation circuits 12Ra, 12Rb, 12Rc, and 12Rd of each transmission channel output light source driving electrical signals ES21Ra, ES21Rb, ES21Rc, and ES21Rd respectively to each light source 11CRa, 11CRb, 11CRc, and 11CRd corresponding to that transmission channel, so that each light source 11CRa, 11CRb, 11CRc, and 11CRd generates continuous light waves LS0Ra, LS0Rb, and L respectively. S0Rc, LS0Rd, and on the other hand, the external optical signal modulators 17Ra, 17Rb, 17Rc, 17Rd corresponding to the transmission channel output light source modulation electrical signals ES22Ra, ES22Rb, ES22Rc, ES22Rd respectively, so that the external optical signal modulators 17Ra, 17Rb, 17Rc, 17Rd modulate the continuous light waves LS0Ra, LS0Rb, LS0Rc, LS0Rd into optical signals LSRa, LSRb, LSRc, LSRd respectively.

[0183] refer to Figure 9 Furthermore, the functions of the signal output and control circuits 13L and 13R, the signal input and control circuits 36L and 36R, the optical detectors 34La, 34Lb, 34Lc, 34Ld, 34Ra, 34Rb, 34Rc, 34Rd, and the transimpedance amplifiers 35La, 35Lb, 35Lc, 35Ld, 35Ra, 35Rb, 35Rc, and 35Rd of each transmission channel in this embodiment are all the same as the functions of the corresponding components in the fifth embodiment of the system for improving optical communication quality.

[0184] Figure 10This is a schematic diagram of the seventh embodiment of the system for improving optical communication quality according to the present invention. In this embodiment, one signal processing unit 10L and another signal processing unit 10R transmit signals to each other through an optical transmission channel. Specifically, the signal processing unit 10L transmits signals to the signal processing unit 10R through several transmission channels, all of which share a single optical transmission channel 20L. Similarly, the signal processing unit 10R transmits signals to the signal processing unit 10L through several other transmission channels, all of which share another optical transmission channel 20R.

[0185] refer to Figure 10 In this signal processing unit 10L, the wavelengths or polarizations of the light sources 11La, 11Lb, 11Lc, 11Ld, and the optical signals LSLa, LSLb, LSLc, and LSLd in each transmission channel are different. For example, the wavelengths of optical signals LSLa and LSLb are different. Or, the polarizations of optical signals LSLa and LSLc are orthogonal. Similarly, in the signal processing unit 10R, the wavelengths or polarizations of the light sources 11Ra, 11Rb, 11Rc, 11Rd, and the optical signals LSRa, LSRb, LSRc, and LSRd in each transmission channel are different.

[0186] refer to Figure 10 An optical combiner 19L in the signal processing unit 10L combines the optical signals LSR, LSRb, LSRc, and LSRd from each transmission channel into an optical signal LSL, which is then transmitted to the signal processing unit 10R via a single optical transmission channel 20L. The optical combiner 19L can be composed of several optical wavelength combiners or several optical polarization combiners. Similarly, an optical combiner 19R in the signal processing unit 10R combines the optical signals LSR, LSRb, LSRc, and LSRd from each transmission channel into an optical signal LSR, which is then transmitted to the signal processing unit 10L via another optical transmission channel 20R. The optical combiner 19R can also be composed of several optical wavelength combiners or several optical polarization combiners.

[0187] refer to Figure 10The optical splitter 39L of the signal processing unit 10R splits the optical signals LSLa, LSLb, LSLc, and LSLd from the optical signal LSL of the optical transmission channel 20L according to their respective wavelengths or polarization characteristics, and transmits them to the corresponding detectors 34La, 34Lb, 34Lc, and 34Ld of the transmission channel. The optical splitter 39L can be composed of several optical wavelength splitters or several optical polarization splitters. Similarly, the optical splitter 39R of the signal processing unit 10L splits the optical signals LSRa, LSRb, LSRc, and LSRd from the optical signal LSR of the optical transmission channel 20R according to their respective wavelengths or polarization characteristics, and transmits them to the corresponding detectors 34Ra, 34Rb, 34Rc, and 34Rd of the transmission channel. The optical splitter 39R can be composed of several optical wavelength splitters or several optical polarization splitters.

[0188] refer to Figure 10 That is, when signal processing unit 10L transmits a signal to signal processing unit 10R, the optical channel through which optical combiner 19L transmits optical signal LSL to optical splitter 39L corresponds to optical channel 20 in the first embodiment of the system for improving optical communication quality. When signal processing unit 10R transmits a signal to signal processing unit 10L, the optical channel through optical combiner 19R to optical splitter 39R transmits optical signal LSR, corresponding to optical channel 20 in the first embodiment of the system for improving optical communication quality.

[0189] refer to Figure 10 Furthermore, the signal output and control circuits 13L and 13R, the signal input and control circuits 36L and 36R, the optical signal driving and modulation circuits 12La, 12Lb, 12Lc, 12Ld, 12Ra, 12Rb, 12Rc, and 12Rd of each transmission channel, the optical detectors 34La, 34Lb, 34Lc, 34Ld, 34Ra, 34Rb, 34Rc, and 34Rd of each transmission channel, and the transimpedance amplifiers 35La, 35Lb, 35Lc, 35Ld, 35Ra, 35Rb, 35Rc, and 35Rd of each transmission channel in this embodiment all have the same functions as the corresponding components in the fifth embodiment of the system for improving optical communication quality.

[0190] Figure 11This is a schematic diagram of the eighth embodiment of the system for improving optical communication quality according to this utility model. The signal processing, monitoring, and control methods in this embodiment are the same as those in the seventh embodiment of the system for improving optical communication quality. However, this embodiment uses external modulation to generate optical signals LSLa, LSLb, LSLc, LSLd and optical signals LSRa, LSRb, LSRc, LSRd. Therefore, in this embodiment, one light source 11CLa and one external optical signal modulator 17La, one light source 11CLb and one external optical signal modulator 17Lb, one light source 11CLc and one external optical signal modulator 17Lc, and one light source 11CLd and one external optical signal modulator 17Ld in the signal processing unit 10L are respectively combined to form a total of four electrical signal to optical signal units 110 in the first embodiment of the system for improving optical communication quality. Similarly, in the signal processing unit 10R, a light source 11CRa is combined with an external optical signal modulator 17Ra, a light source 11CRb is combined with an external optical signal modulator 17Rb, a light source 11CRc is combined with an external optical signal modulator 17Rc, and a light source 11CRd is combined with an external optical signal modulator 17Rd to form four other electrical signal to optical signal units 110 in the first embodiment of the system for improving optical communication quality.

[0191] refer to Figure 11In the signal processing unit 10L, the optical signal driving and modulation circuits 12La, 12Lb, 12Lc, and 12Ld of each transmission channel output light source driving electrical signals ES21La, ES21Lb, ES21Lc, and ES21Ld to the light sources 11CLa, 11CLb, 11CLc, and 11CLd corresponding to each transmission channel, respectively, so that each light source 11CLa, 11CLb, 11CLc, and 11CLd generates continuous light waves LS0La, LS0Lb, and LS0, respectively. Lc, LS0Ld, and on the other hand, output light source modulation electrical signals ES22La, ES22Lb, ES22Lc, ES22Ld to the external optical signal modulators 17La, 17Lb, 17Lc, 17Ld corresponding to each transmission channel, so that each external optical signal modulator 17La, 17Lb, 17Lc, 17Ld modulates the continuous light waves LS0La, LS0Lb, LS0Lc, LS0Ld into optical signals LSLa, LSLb, LSLc, LSLd respectively. Similarly, in the signal processing unit 10R, the optical signal driving and modulation circuits 12Ra, 12Rb, 12Rc, and 12Rd of each transmission channel output light source driving electrical signals ES21Ra, ES21Rb, ES21Rc, and ES21Rd to the light sources 11CRa, 11CRb, 11CRc, and 11CRd corresponding to each transmission channel, respectively, so that each light source 11CRa, 11CRb, 11CRc, and 11CRd generates continuous light waves LS0Ra, LS0Rb, and L respectively. S0Rc, LS0Rd, and on the other hand, the external optical signal modulators 17Ra, 17Rb, 17Rc, 17Rd corresponding to each transmission channel output light source modulation electrical signals ES22Ra, ES22Rb, ES22Rc, ES22Rd respectively, so that each external optical signal modulator 17Ra, 17Rb, 17Rc, 17Rd modulates the continuous light waves LS0Ra, LS0Rb, LS0Rc, LS0Rd into optical signals LSRa, LSRb, LSRc, LSRd respectively.

[0192] refer to Figure 11 This embodiment is similar to the seventh embodiment of the system for improving optical communication quality. When the signal processing unit 10L transmits a signal to the signal processing unit 10R, the optical channel through which the optical signal LSL is transmitted from the optical combiner 19L to the optical splitter 39L via the optical channel 20L corresponds to the optical channel 20 of the first embodiment of the system for improving optical communication quality. When the signal processing unit 10R transmits a signal to the signal processing unit 10L, the optical channel through which the optical combiner 19R transmits the optical signal LSR to the optical splitter 39R via the optical channel 20R corresponds to the optical channel 20 of the first embodiment of the system for improving optical communication quality.

[0193] refer to Figure 11Furthermore, the signal output and control circuits 13L and 13R, the signal input and control circuits 36L and 36R, the optical combiners 19L and 19R, the optical splitters 39L and 39R, the light sources 11CLa, 11CLb, 11CLc, 11CLd, 11CRa, 11CRb, 11CRc, and 11CRd of each transmission channel, the photodetectors 34La, 34Lb, 34Lc, 34Ld, 34Ra, 34Rb, 34Rc, and 34Rd of each transmission channel, and the transimpedance amplifiers 35La, 35Lb, 35Lc, 35Ld, 35Ra, 35Rb, 35Rc, and 35Rd of each transmission channel all have the same functions as the corresponding components in the seventh embodiment.

[0194] Figure 12 This is a schematic diagram of the ninth embodiment of the system for improving optical communication quality according to this utility model. In this embodiment, continuous light waves from several transmission channels with different wavelengths or polarization characteristics are combined into a common optical transmission channel by an optical combiner. Then, several designated channel external optical signal modulators on the common optical transmission channel sequentially modulate the continuous light waves of each transmission channel to generate optical signals for each transmission channel. That is, a light source 11Cla, an optical combiner 19L, a common optical transmission channel, and a designated channel external optical signal modulator 17mLa in the signal processing unit 10L are combined to form an electrical signal to optical signal conversion unit 110 for one transmission channel in the first embodiment of the system for improving optical communication quality. Figure 12 As shown, four electrical signal to optical signal conversion units 110, corresponding to the four transmission channels in the first embodiment of the system for improving optical communication quality, can be combined in the signal processing unit 10L. Similarly, as... Figure 12 As shown, the signal processing unit 10R can be combined into four electrical signal to optical signal conversion units 110 corresponding to the four transmission channels in the first embodiment of the system for improving the quality of optical communication.

[0195] refer to Figure 12 Furthermore, in this embodiment, optical signals from several transmission channels with different wavelengths or polarization characteristics, located in the same common optical transmission channel, sequentially pass through designated channel detectors to generate electrical signals corresponding to each transmission channel, and then are sent to the transimpedance amplifiers of each transmission channel. That is, a common optical transmission channel in the signal processing unit 10R and a designated channel detector 34mLa are combined to form an optical signal to electrical signal unit 340 for one transmission channel in the first embodiment of a system that improves optical communication quality. For example... Figure 12 As shown, four optical signal to electrical signal conversion units 340, corresponding to the four transmission channels in the first embodiment of the system for improving optical communication quality, can be combined in the signal processing unit 10R. Similarly, as... Figure 12As shown, the signal processing unit 10L can be combined into four optical signal to electrical signal units 340 corresponding to the four transmission channels in the first embodiment of the system for improving the quality of optical communication.

[0196] refer to Figure 12 In this embodiment, an external modulation method is used to generate the optical signal. Specifically, the light source driving circuit 12L0 of the signal processing unit 10L receives the driving analog electrical signal ES1L0 from the signal output and control circuit 13L, and generates light source driving electrical signals ES21La, ES21Lb, ES21Lc, and ES21Ld for each transmission channel, so that each light source 11CLa, 11CLb, 11CLc, and 11CLd generates the continuous light waves LS0La, LS0Lb, LS0Lc, and LS0Ld corresponding to each transmission channel, respectively. Similarly, the light source driving circuit 12L0 of the signal processing unit 10R receives the driving analog electrical signal ES1R0 from the signal output and control circuit 13L, and generates light source driving electrical signals ES21Ra, ES21Rb, ES21Rc, and ES21Rd for each transmission channel, so that each light source 11CRa, 11CRb, 11CRc, and 11CRd generates continuous light waves LS0Ra, LS0Rb, LS0Rc, and LS0Rd corresponding to each transmission channel.

[0197] refer to Figure 12 The wavelengths or polarizations of the continuous light waves LS0La, LS0Lb, LS0Lc, and LS0Ld generated by the light sources 11CLa, 11CLb, 11CLc, and 11CLd in each transmission channel of the signal processing unit 10L are different. The optical combiner 19L of the signal processing unit 10L combines the continuous light waves LS0La, LS0Lb, LS0Lc, and LS0Ld from each transmission channel into a continuous light wave LS0L. The optical combiner 19L can be composed of several optical wavelength combiners or several optical polarization combiners. Similarly, the wavelengths or polarizations of the continuous light waves LS0Ra, LS0Rb, LS0Rc, and LS0Rd generated by the light sources 11CRa, 11CRb, 11CRc, and 11CRd in each transmission channel of the signal processing unit 10R are different. The optical combiner 19R of the signal processing unit 10R combines the continuous optical waves LS0Ra, LS0Rb, LS0Rc, and LS0Rd from each transmission channel into a continuous optical wave LS0R. The optical combiner 19R can be composed of several optical wavelength combiners or several optical polarization combiners.

[0198] refer to Figure 12In the signal processing unit 10L, the light source modulation circuits 12Lma, 12Lmb, 12Lmc, and 12Lmd of each transmission channel receive the modulated analog electrical signals ES1La, ES1La, ES1La, and ES1La from each transmission channel of the signal output and control circuit 13L, and output the light source modulation electrical signals ES22La, ES22Lb, ES22Lc, and ES22Ld of each transmission channel to the designated external optical signal modulators 17mLa, 17mLb, 17mLc, and 17mLd of each transmission channel, respectively. Similarly, in the signal processing unit 10R, the light source modulation circuits 12Rma, 12Rmb, 12Rmc, and 12Rmd of each transmission channel receive the modulated analog electrical signals ES1Ra, ES1Ra, ES1Ra, and ES1Ra from each transmission channel of the signal output and control circuit 13R, and output the light source modulation electrical signals ES22Ra, ES22Rb, ES22Rc, and ES22Rd of each transmission channel to the designated external optical signal modulators 17mRa, 17mRb, 17mRc, and 17mRd of each transmission channel, respectively.

[0199] refer to Figure 12In this example, the designated channel external optical signal modulators 17mLa, 17mLb, 17mLc, 17mLd, 17mRa, 17mRb, 17mRc, and 17mRd modulate the optical signal only for continuous light waves with specific wavelengths and polarization characteristics in a specific transmission channel, while allowing continuous light waves or signals from non-specific transmission channels to pass through. In the signal processing unit 10L, the designated channel external optical signal modulator 17mLa modulates only the continuous light wave LS0La of a specific transmission channel within the continuous light wave LS0L, generating a combined optical signal LSLa and an optical signal LS0aL from the continuous light waves LS0Lb, LS0Lc, and LS0Ld. The designated channel external optical signal modulator 17mLb modulates only the continuous light wave LS0Lb of a specific transmission channel within the continuous light wave LS0aL, generating a combined optical signal LSLa, LSLb and an optical signal LS0abL from the continuous light waves LS0Lc and LS0Ld. The designated channel external optical signal modulator 17mLc modulates only the continuous optical wave LS0Lc of a specific transmission channel in the continuous optical wave LS0abL, generating the optical signal LS0abcL, which combines the optical signals LSLa, LSLb, LSLc, and the continuous optical wave LS0Ld. Similarly, the designated channel external optical signal modulator 17mLd modulates only the continuous optical wave LS0Ld of a specific transmission channel in the continuous optical wave LS0abcL, generating the optical signal LSL, which combines the optical signals LSLa, LSLb, LSLc, and LSLd of each transmission channel. Likewise, in the signal processing unit 10R, the designated channel external optical signal modulator 17mRa modulates only the continuous optical wave LS0Ra of a specific transmission channel in the continuous optical wave LS0R, generating the optical signal LSRa, which combines the optical signals LS0Rb, LS0Rc, and LS0Rd. The designated channel external optical signal modulator 17mRb modulates only the continuous optical wave LS0Rb of a specific transmission channel within the continuous optical wave LS0aR, generating a combined optical signal LS0abR that integrates the optical signals LSRa, LSRb, and the continuous optical waves LS0Rc, LS0Rd. The designated channel external optical signal modulator 17mRc modulates only the continuous optical wave LS0Rc of a specific transmission channel within the continuous optical wave LS0abR, generating a combined optical signal LS0abcR that integrates the optical signals LSRa, LSRb, LSRc, and LS0Rd. The designated channel external optical signal modulator 17mRd modulates only the continuous optical wave LS0Rd of a specific transmission channel within the continuous optical wave LS0abcR, generating a combined optical signal LSR that integrates the optical signals LSRa, LSRb, LSRc, and LSRd from all transmission channels.

[0200] refer to Figure 12In this embodiment, the designated channel detectors 34mLa, 34mLb, 34mLc, 34mLd, 34mRa, 34mRb, 34mRc, and 34mRd only detect optical signals from specific transmission channels with specific wavelengths and polarization characteristics to form corresponding electrical signals, while allowing continuous light waves or signals from non-specific transmission channels to pass through. In the signal processing unit 10R, the designated channel detector 34mLa only detects the optical signal LSaL from a specific transmission channel in the optical signal LSL to form the corresponding analog current signal ES3La for that transmission channel. The optical signal LSL, which combines the optical signals LSLa, LSLb, LSLc, and LSLd, becomes the optical signal LSLbcd after passing through the designated channel detector 34mLa. The designated channel detector 34mLb only detects the optical signal LSLb from a specific transmission channel in the optical signal LSLbcd to form the corresponding analog current signal ES3Lb for that transmission channel. After passing through the designated channel detector 34mLb, the optical signal LSLbcd becomes the optical signal LSLcd, which combines the optical signals LSLc and LSLd. The designated channel detector 34mLc detects only the optical signal LSLc from a specific transmission channel within the optical signal LSLcd to form the corresponding analog current signal ES3Lc. Similarly, in the signal processing unit 10L, the designated channel detector 34mRa detects only the optical signal LSaR from a specific transmission channel within the optical signal LSR to form the corresponding analog current signal ES3Ra. The optical signal LSR, which combines the optical signals LSRra, LSRb, LSRc, and LSRd, becomes the optical signal LSRbcd, which combines the optical signals LSRb, LSRc, and LSRd, after passing through the designated channel detector 34mRa. The designated channel detector 34mRb detects only the optical signal LSRb of a specific transmission channel within the optical signal LSRbcd, forming the corresponding analog current signal ES3Rb for that transmission channel. After passing through the designated channel detector 34mRb, the optical signal LSRbcd becomes the combined optical signal LSRcd, which includes the optical signals LSRc and LSRd. The designated channel detector 34mRc detects only the optical signal LSRc of a specific transmission channel within the optical signal LSRcd, forming the corresponding analog current signal ES3Rc for that transmission channel. After passing through the designated channel detector 34mRc, the optical signal LSRcd becomes the optical signal LSRd. The designated channel detector 34mRd detects the corresponding analog current signal ES3Rd within the optical signal LSRd.

[0201] refer to Figure 12Furthermore, in this embodiment, the signal output and control circuits 13L and 13R, the signal input and control circuits 36L and 36R, and the transimpedance amplifiers 35La, 35Lb, 35Lc, 35Ld, 35Ra, 35Rb, 35Rc, and 35Rd of each transmission channel all have the same functions as the corresponding components in the fifth embodiment of the system for improving optical communication quality.

[0202] Figure 13 This is a schematic diagram of the tenth embodiment of the system for improving optical communication quality according to this utility model. The signal processing, monitoring, and control methods in this embodiment are the same as those in the ninth embodiment of the system for improving optical communication quality. However, in this embodiment, a multi-channel light source capable of generating continuous light waves with different wavelengths or polarization characteristics replaces the combination of multiple light sources converging into the optical combiner in the ninth embodiment of the system for improving optical communication quality. That is, a multi-channel light source 11mL in the signal processing unit 10L, a common optical transmission channel, and a designated channel external optical signal modulator 17mLa are combined to form an electrical signal to optical signal unit 110 for one transmission channel in the first embodiment of the system for improving optical communication quality. (As...) Figure 13 As shown, four electrical signal to optical signal conversion units 110, corresponding to the four transmission channels in the first embodiment of the system for improving optical communication quality, can be combined in the signal processing unit 10L. Similarly, as... Figure 13 As shown, the signal processing unit 10R can be combined into four electrical signal to optical signal conversion units 110 corresponding to the four transmission channels in the first embodiment of the system for improving the quality of optical communication.

[0203] refer to Figure 13 Furthermore, the composition of the optical signal to electrical signal unit 340 of the transmission channel in the first embodiment of the system for improving optical communication quality is the same as that in the ninth embodiment of the system for improving optical communication quality, and therefore will not be described again.

[0204] refer to Figure 13The optical signal driving circuit 12L0 of the signal processing unit 10L receives the driving analog electrical signal ES1L0 from the signal output and control circuit 13L, generates a light source driving electrical signal ES21L, and outputs the light source driving electrical signal ES21L to the multi-channel light source 11mL, causing the multi-channel light source 11mL to generate a continuous light wave LS0L. The continuous light wave LS0L comprises continuous light waves LS0La, LS0Lb, LS0Lc, and LS0Ld with different wavelengths or polarization characteristics, corresponding to the transmission channels. Similarly, the optical signal driving circuit 12R0 of the signal processing unit 10R receives the driving analog electrical signal ES1R0 from the signal output and control circuit 13R, generates a light source driving electrical signal ES21R, and outputs the light source driving electrical signal ES21R to the multi-channel light source 11mR, causing the multi-channel light source 11mR to generate a continuous light wave LS0R. Among them, the continuous light wave LS0R has different wavelengths or polarization characteristics, corresponding to the continuous light waves LS0Ra, LS0Rb, LS0Rc, and LS0Rd of each transmission channel.

[0205] refer to Figure 13 Furthermore, in this embodiment, the signal output and control circuits 13L and 13R, the signal input and control circuits 36L and 36R, the optical transmission channels 20L and 20R, the optical signal modulation circuits 12Lma, 12Lmb, 12Lmc, 12Lmc, 12Rma, 12Rmb, 12Rmc, and 12Rmc for each transmission channel, and the designated channel external optical signal modulators 17mLa, 17mLb, 17mLc, 17mLd, and 17mRa for each transmission channel are also included. The functions of the optical detectors 34mLa, 34mLb, 34mLc, 34mLd, 34mRa, 34mRb, 34mRc, and 34mRd for each transmission channel, and the transimpedance amplifiers 35La, 35Lb, 35Lc, 35Ld, 35Ra, 35Rb, 35Rc, and 35Rd for each transmission channel are the same as those of the components corresponding to the components in the ninth embodiment of the system for improving optical communication quality.

[0206] The above are merely preferred embodiments of the present utility model and are illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalent alterations can be made to the present utility model within the spirit and scope defined by the claims, but all such changes will fall within the protection scope of the present utility model.

[0207] In addition, refer to Figure 2 The system of this utility model may include the following steps in specific use, but is not limited thereto:

[0208] Step 1, provide a... Figure 2 The aforementioned signal transmission system.

[0209] Step two: The transmitting end signal processing unit 100 receives the target transmission signal MS0 from the upper-level communication layer of the transmitting end, and converts this target transmission signal MS0 into a physical medium signal PS0 for each transmission channel that can be transmitted in the transmission channels 200 connecting the two signal processing units. Each transmission channel 200 connecting the two signal processing units transmits the physical medium signal PS0 of each transmission channel to the receiving end signal processing unit 300.

[0210] Step three: After analyzing the physical medium signal PS0 of the transmission channel, the receiving signal processing unit 300 obtains the target transmission signal MS0 and the transmission channel information signal CS0 of each transmission channel. The receiving signal processing unit 300 transmits the target transmission signal MS0 to the upper-level communication layer of the receiving end, thereby achieving the purpose of transmitting the target transmission signal. In addition, the receiving signal processing unit 300 also feeds back the transmission channel information signal CS0 of each transmission channel to the transmitting signal processing unit 100 at an appropriate time.

[0211] Step four: The transmitting end signal processing unit 100 uses the received transmission channel information signal CS0 of each transmission channel to adjust the physical medium signal PS0 of each subsequent transmission channel, thereby maintaining or improving the communication quality of each transmission channel.

[0212] Furthermore, the transmitting end signal processing unit 100 generates a transmission channel quality signal QS0 based on the transmission channel information signal CS0 of each transmission channel, and transmits the transmission channel quality signal QS0 to the upper-level communication layer of the transmitting end signal processing unit 100 for reference by the upper-level network layer in transmission channel management and equipment management and maintenance.

[0213] The appropriate timing for the receiving signal processing unit 300 to feed back the transmission channel information signal CS0 of each transmission channel to the transmitting signal processing unit 100 may include, but is not limited to, a combination of at least one of the following groups:

[0214] Firstly, it is immediate.

[0215] Secondly, a specific cycle.

[0216] Third, when the average analog level of the physical medium signal PS0 received by the receiving end signal processing unit 300 is abnormal.

[0217] Fourth, when the analog level corresponding to each digital signal of the physical medium signal PS0 received by the receiving end signal processing unit 300 is abnormal.

[0218] Fifth, when the bit error rate (BER) of the physical medium signal PSO received by the receiving end signal processing unit 300 increases.

[0219] Sixth, when the noise ratio of the physical medium signal PSO received by the receiving end signal processing unit 300 increases.

[0220] Seventh, when the frequency response of the transmission channel is abnormal.

[0221] Eighth, when performing device diagnostics on the communication system 0.

[0222] Furthermore, the transmission channel information signal CS0 of each transmission channel may include a combination of at least one of the following groups:

[0223] Firstly, it represents the average analog level of the physical medium signal PS0 received by the receiving end signal processing unit 300 from each transmission channel.

[0224] Secondly, it represents the analog level information corresponding to each digital signal digit of the physical medium signal PS0 of each transmission channel received by the receiving end signal processing unit 300.

[0225] Third, the time-domain signal f represents the physical medium signals of each transmission channel received by the receiving end signal processing unit 300 in a certain time interval τ. out (t), or its spectral signal F out Information about (ω).

[0226] Fourth, the bit error rate of the physical medium signal PS0 of each transmission channel received by the receiving end signal processing unit 300.

[0227] Fifth, the noise ratio of the physical medium signal PSO of each transmission channel received by the receiving end signal processing unit 300.

[0228] The transmitting signal processing unit 100 further extracts partial features of the physical medium signal PS0 of each transmitted transmission channel and compares them with the received transmission channel information signal CS0 of each transmission channel. This analysis result is used to adjust the physical medium signal PS0 of each transmission channel, thereby maintaining or improving the signal quality of each transmission channel. The partial features of the physical medium signal PS0 of each transmitted transmission channel extracted by the transmitting signal processing unit 100 may include a combination of at least one of the following groups:

[0229] Firstly, it represents the average value of the analog level of the physical medium signal PS0.

[0230] Secondly, it represents the information of the analog bit level of each digital signal corresponding to the physical medium signal PS0.

[0231] Thirdly, it represents the corresponding f out(t) In the time interval τ, the time-domain signal f of the physical medium signal PS0 output by the transmitting signal processing unit 100 in (t), or its spectral signal F in Information about (ω).

[0232] Fourth, the frequency response representing the transmission channel. Information.

[0233] The method by which the transmitting end signal processing unit 100 analyzes the transmission channel information signal CS0 and adjusts the physical medium signal PS0 of each transmission channel may include a combination of at least one of the following groups, but is not limited thereto:

[0234] Firstly, when the average analog level of the physical medium signal PS0 received by the receiving end signal processing unit 300 is lower than the expected average or an acceptable average range, the average analog level of the physical medium signal PS0 transmitted by the transmitting end signal processing unit 100 is increased.

[0235] Secondly, when the average analog level of the physical medium signal PS0 received by the receiving end signal processing unit 300 is higher than the expected average or the acceptable average range, the average analog level of the physical medium signal PS0 transmitted by the transmitting end signal processing unit 100 is reduced.

[0236] Third, when the analog level of a certain digital signal of the physical medium signal PSO received by the receiving end signal processing unit 300 is lower than the expected analog level of the digital signal or the acceptable analog level range of the digital signal, the analog level of the physical medium signal PSO output by the transmitting end signal processing unit 100 to the digital signal is increased.

[0237] Fourth, when the analog level of a certain digital signal of the physical medium signal PSO received by the receiving end signal processing unit 300 is higher than the expected analog level of the digital signal or the acceptable analog level range of the digital signal, the analog level of the physical medium signal PSO output by the transmitting end signal processing unit 100 to the digital signal is reduced.

[0238] Fifth, the physical medium signal analog level A corresponding to the smallest digital signal of the physical medium signal PS0 transmitted by the transmitting end signal processing unit 100. in_min The value is zero. Therefore, the physical medium signal analog level A corresponding to the smallest digital signal received by the receiving end signal processing unit 300 is zero. out_min It is also zero.

[0239] Sixth, adjust the analog level A of the physical medium signal corresponding to the maximum digital signal of the physical medium signal PS0 sent by the signal processing unit 100 at the transmitting end.in_max This makes the physical medium signal analog level A corresponding to the maximum digital signal received by the receiving end signal processing unit 300. out_max The minimum analog level value for the physical medium signal PS0 received by the receiving end signal processing unit 300 under the condition of an acceptable bit error rate.

[0240] Seventh, adjust the analog level A of the physical medium signal corresponding to the maximum digital signal of the physical medium signal PS0 sent by the signal processing unit 100 at the transmitting end. in_max This makes the physical medium signal analog level A corresponding to the maximum digital signal received by the receiving end signal processing unit 300. out_max The minimum analog level value of the physical medium signal PS0 received by the receiving signal processing unit 300 under acceptable noise ratio conditions.

[0241] Eighth, the physical medium signal analog level corresponding to the maximum digital signal transmitted by the transmitting end signal processing unit 100 is set to... Among them, A out_max The minimum analog level of the physical medium signal corresponding to the maximum digital signal that the receiving signal processing unit 300 can receive under conditions where it has appropriate signal transmission capabilities. A in_max_ -For the transmitting signal processing unit 100 in a certain time period τ - The analog level of the physical medium signal corresponding to the maximum digital signal transmitted. A out_max_ -For the receiving end signal processing unit 300 in the previous time period τ - The analog level of the physical medium signal corresponding to the received maximum digital signal.

[0242] Ninth, adjust the analog physical medium signal level corresponding to each digital signal digit of the physical medium signal PSO transmitted by the transmitting end signal processing unit 100, so that there is an equal difference between the analog physical medium signal levels corresponding to all adjacent large and small digital signal digits (such as 00 and 01, 01 and 10, 10 and 11 in PAM4) received by the receiving end signal processing unit 300 from the transmission channel. Taking the PAM4 digital signal as an example, the analog physical medium signal level corresponding to digital signal digit 00 received by the receiving end signal processing unit 300 is A. 00 The physical medium signal analog level corresponding to digital signal 0 and 1 is A. 01 The physical medium signal analog level corresponding to the digital signal digit 10 is A. 10 The physical medium signal analog level corresponding to the digital signal digit 11 is A. 11 Then A 11 -A 10 =A10 -A 01 =A 01 -A 00 .

[0243] Tenth, adjust the physical medium signal PS0 transmitted by the transmitting end signal processing unit 100, so that the transmitting end signal processing unit 100 in a subsequent time period τ + The time-domain signal of the physical medium signal PS0 of a certain transmission channel is: in, For the conversion of fulvegetal, For the inverse Fourier transform. f out+ (t) represents the subsequent time interval τ in that corresponding time period. + To enable the receiving end signal processing unit 300 to receive the time-domain signal of the physical medium signal PSO of the transmission channel, F out+ (ω)=F(f out+ (t) is its spectral signal. in- (t) represents the previous time interval τ. - The time-domain signal of the physical medium signal PS0 output by the transmitting end signal processing unit 100 to the transmission channel, F in- (ω)=F(f in- (t) is its spectral signal. out- (t) corresponds to the time interval τ before this. - The time-domain signal of the physical medium signal PSO of the transmission channel, received by the receiving end signal processing unit 300, F out- (ω)=F(f out- (t) is its spectral signal. That is, when the transmitting end signal processing unit 100 outputs the desired signal f... in+ The frequency response of the transmission channel between the transmitting end signal processing unit 100 and the receiving end signal processing unit 300 stored at time (t).

[0244] To further optimize the quality of each transmission channel of the communication system, the following transmission channel calibration and optimization procedures can be performed sequentially using the system of this utility model.

[0245] Step one: Before formal signal transmission, adjust the settings of the communication system to ensure that each transmission channel has the appropriate signal transmission function. Under these conditions, the transmitting end signal processing unit captures and stores the physical medium signal PS0 of each transmission channel. i The characteristics are set, and the transmission channel information signal CS0 of each received transmission channel is stored. i In addition, the receiving end signal processing unit captures and stores the physical medium signal PSO received from each transmission channel.i The characteristics of each transmission channel are used to form the transmission channel information signal of each transmission channel, and this signal is fed back to the transmitting end signal processing unit. For the sake of precision, it will be referred to below as the appropriate transmission physical medium signal PS0 sent by the transmitting end signal processing unit when each transmission channel has the appropriate transmission signal function. in_i The physical medium signal PS0 received by the signal processing unit at the receiving end from each transmission channel is the appropriate physical medium signal PS0. out_i The transmission channel information signal for each transmission channel is the appropriate transmission channel information signal CS0. i .

[0246] In step one, the condition that each transmission channel has the appropriate signal transmission function may include a combination of at least one of the following groups:

[0247] First, the appropriate physical transmission medium signal PS0 transmitted by the transmitting end signal processing unit 100. in_i The smallest digital signal bit (such as 0 in PAM2 or 00 in PAM4) corresponds to the physical medium signal analog level A. in_min The value is zero. Therefore, the physical medium signal analog level A corresponding to the smallest digital signal received by the receiving end signal processing unit 300 is zero. out_min It is also zero.

[0248] Secondly, the appropriate physical medium signal PS0 received by the receiving end signal processing unit 300. out_i The physical medium signal analog level A corresponding to the maximum digital signal bit (such as 1 in PAM2 or 11 in PAM4) out_max To ensure that the appropriate physical medium signal PS0 received by the receiving signal processing unit 300 is received out_i The minimum analog bit level value under acceptable bit error rate conditions.

[0249] Third, the appropriate physical medium signal PS0 received by the receiving end signal processing unit 300. out_i The maximum digital signal corresponds to the physical medium signal analog level A out_max To ensure that the appropriate physical medium signal PS0 received by the receiving signal processing unit 300 is received out_i The minimum analog level value under acceptable noise ratio conditions.

[0250] Fourth, the appropriate physical medium signal PS0 received by the receiving end signal processing unit 300. out_iAll adjacent digital signal levels (such as between 00 and 01, 01 and 10, 10 and 11 in PAM4) have an equal difference between their corresponding physical medium signal analog levels. Taking the PAM4 digital signal as an example, the physical medium signal analog level corresponding to digital signal level 00 received by the receiving signal processing unit 300 is A. 00 The physical medium signal analog level corresponding to digital signal 0 and 1 is A. 01 The physical medium signal analog level corresponding to the digital signal digit 10 is A. 10 The physical medium signal analog level corresponding to the digital signal digit 11 is A. 11 Then A 11 -A 10 =A 10 -A 01 =A 01 -A 00 .

[0251] Fifth, the appropriate physical medium signal PS0 received by the receiving end signal processing unit 300. out_i The bit error rate is lower than the acceptable bit error rate.

[0252] Sixth, the appropriate physical medium signal PS0 received by the receiving end signal processing unit 300. out_i The noise ratio is lower than the acceptable noise ratio.

[0253] Step 2: Analyze the appropriate transmission channel information signal CS0 for each transmission channel. i The appropriate physical transmission medium signal PS0 of each transmission channel transmitted by the transmitting end signal processing unit 100 in_i The information obtained is channel information under the condition that each transmission channel has appropriate signal transmission function, which may include a combination of at least one of the following groups:

[0254] Firstly, it represents the appropriate physical transmission medium signal PS0 transmitted by the transmitting end signal processing unit 100. in_i Information on the average analog level.

[0255] Secondly, it represents the appropriate physical transmission medium signal PS0 transmitted by the transmitting end signal processing unit 100. in_i The information corresponding to the analog bit level of each digital signal.

[0256] Third, the appropriate physical medium signal PS0 received by the receiving signal processing unit 300. out_i Information on the average analog level.

[0257] Fourth, the appropriate physical medium signal PS0 received by the receiving signal processing unit 300. out_iThe information corresponding to the analog bit level of each digital signal.

[0258] Fifth, representing the appropriate physical medium signal PS0 received by the receiving end signal processing unit 300. out_i Information on bit error rate.

[0259] Sixth, representing the appropriate physical medium signal PS0 received by the receiving end signal processing unit 300. out_i Information on the noise ratio.

[0260] Seventh, representing the appropriate physical transmission medium signal PS0 transmitted by the transmitting end signal processing unit 100. in_i Corresponding to a certain time interval τ i The time-domain signal f in_i (t), or its spectral signal F in_i Information about (ω).

[0261] Eighth, representing the appropriate physical medium signal PS0 received by the receiving end signal processing unit 300. out_i Corresponding to this time interval τ i The time-domain signal f out_i (t), or its spectral signal F out_i Information about (ω).

[0262] Ninth, representing the appropriate transmission frequency response of the transmission channel. Information.

[0263] Step 3: Setting up the transmission channel 200 that connects the two signal processing units.

[0264] Step four: During subsequent signal transmission, the receiving end signal processing unit 300 captures and stores the characteristics of the received physical medium signal PS0 in real time, and obtains the transmission channel information signal CS0 of each transmission channel in real time, and feeds it back to the transmitting end signal processing unit 100. The transmitting end signal processing unit 100 captures and stores the characteristics of the transmitted physical medium signal PS0 in real time, and obtains and stores the transmission channel information signal CS0 of each transmission channel received from the receiving end signal processing unit 300 in real time. For precise explanation, the physical medium signal PS0 of each transmission channel transmitted by the transmitting end signal processing unit in the subsequent signal transmission process will be referred to as the real-time transmitted physical medium signal PS0. in_r The physical medium signal PS0 received by the signal processing unit at the receiving end from each transmission channel is the real-time received physical medium signal PS0. out_r The transmission channel information signal for each transmission channel is the real-time transmission channel information signal CS0. r .

[0265] Step 5: During subsequent signal transmission, the transmitting end signal processing unit 100 analyzes the received real-time transmission channel information signals CS0 of each transmission channel. r The physical medium signal PS0 for real-time transmission of signals from each transmission channel in_r This is to obtain real-time channel information for each transmission channel. It may include a combination of at least one of the following groups:

[0266] Firstly, it represents the instantaneous transmission physical medium signal PS0 sent by the transmitting end signal processing unit 100. in_r Information on the average analog level.

[0267] Secondly, it represents the real-time transmission physical medium signal PS0 sent by the transmitting end signal processing unit 100. in_r The information corresponding to the analog bit level of each digital signal.

[0268] Third, it represents the real-time received physical medium signal PS0 received by the receiving end signal processing unit 300. out_r Information on the average analog level.

[0269] Fourth, the real-time received physical medium signal PS0 received by the receiving end signal processing unit 300. out_r The information corresponding to the analog bit level of each digital signal.

[0270] Fifth, representing the real-time received physical medium signal PS0 received by the receiving end signal processing unit 300. out_r Information on bit error rate.

[0271] Sixth, representing the real-time received physical medium signal PS0 received by the receiving end signal processing unit 300. out_r Information on the noise ratio.

[0272] Seventh, representing the real-time transmission physical medium signal PS0 sent by the transmitting end signal processing unit 100. in_r Corresponding to a certain time interval τ r The time-domain signal f in_r (t), or its spectral signal F in_r Information about (ω).

[0273] Eighth, representing the real-time received physical medium signal PS0 received by the receiving end signal processing unit 300. out_r Corresponding to this time interval τ i The time-domain signal f out_r (t), or its spectral signal F out_r Information about (ω).

[0274] Ninth, representing the instantaneous transmission frequency response of the transmission channel. Information.

[0275] Step six: The transmitting end signal processing unit 100 compares and analyzes the appropriate transmission channel information of each transmission channel obtained in step two with the real-time transmission channel information of each transmission channel obtained in step five. Based on the comparison and analysis results, it adjusts the physical medium signal PSO output by the transmitting end signal processing unit 100 to each transmission channel to improve the quality of each transmission channel. Alternatively, the transmitting end signal processing unit 100 generates a transmission channel quality signal QS0 to inform the upper-level communication layer of the quality status of each channel. This signal may include a combination of at least one of the following groups:

[0276] Firstly, if the physical medium signal PS0 is received immediately... out_r Average analog level A out_avg_r Below the appropriate physical medium signal PS0 out_i Average analog level A out_avg_i If the physical medium signal PS0 output by the transmitting end signal processing unit 100 is adjusted, the average analog level of the physical medium signal PS0 received by the receiving end signal processing unit 300 will be increased.

[0277] Secondly, if the physical medium signal PS0 is received immediately... out_r Average analog level A out_avg_r Higher than the appropriate physical medium signal PS0 out_i Average analog level A out_avg_i If the physical medium signal PS0 output by the transmitting end signal processing unit 100 is adjusted, the average analog level of the physical medium signal PS0 received by the receiving end signal processing unit 300 will be reduced.

[0278] Third, if the physical medium signal PS0 is received immediately. out_r In this context, the analog level of the optical signal corresponding to a certain digital signal is lower than that of the appropriate receiving physical medium signal PS0. out_i The analog level corresponding to the digital signal is adjusted by adjusting the physical medium signal PS0 output by the transmitting end signal processing unit 100 to increase the analog level of the physical medium signal PS0 received by the receiving end signal processing unit 300 corresponding to the digital signal.

[0279] Fourth, if the physical medium signal PS0 is received immediately. out_r In this context, the analog level of the optical signal corresponding to a certain digital signal is higher than that of the appropriate receiving physical medium signal PS0. out_i The analog level corresponding to the digital signal is adjusted by adjusting the physical medium signal PS0 output by the transmitting end signal processing unit 100 to reduce the analog level of the physical medium signal PS0 received by the receiving end signal processing unit 300 corresponding to the digital signal.

[0280] Fifth, if the physical medium signal is lost in real time Signal loss greater than that of a suitable physical medium This anomaly is then communicated to the higher-level communication layer via the transmission channel quality signal QS0, serving as a reference for transmission channel management and equipment management and maintenance. Among these, A... in_avg_r To transmit physical medium signals PS0 in real time in_r The average simulated level, A out_avg_r To receive physical medium signals PS0 in real time out_r The average simulated level, A in_avg_i To properly transmit the physical medium signal PS0 in_i The average simulated level, A out_avg_i To properly receive the physical medium signal PS0 out_i The average value of the simulated level.

[0281] Sixth, compare the instantaneous frequency response. With appropriate frequency response If the difference between the two exceeds the allowable range, this anomaly is reported to the upper-level communication layer via the transmission channel quality signal QS0, serving as a reference for transmission channel management and equipment management and maintenance. Among these, f in_r (t) represents the instantaneous transmission of the physical medium signal PS0. in_r For comparison, a certain time interval τ before the comparison r The time-domain signal, F in_r (ω)=F(f in_r (t) is its spectral signal. out_r (t) represents the instantaneous reception of the physical medium signal PS0. out_r In the time interval τ r The time-domain signal, F out_r (ω)=F(f out_r (t) is its spectral signal. in_i (t) is for properly transmitting the physical medium signal PS0 in_i In another time period τ i The time-domain signal, F in_i (ω)=F(f in_i (t) is its spectral signal. out_i (t) is for proper reception of physical medium signal PS0 out_i In the time interval τ i The time-domain signal, F out_i (ω)=F(f out_i (t) is its spectral signal.

[0282] Seventh, compare the instantaneous reception of the physical medium signal PS0. out_r The bit error rate and the appropriate physical medium signal PS0 are related. out_iIf the difference between the two exceeds the allowable range, the abnormality will be reported to the upper communication layer via the transmission channel quality signal QS0, so as to serve as a reference for transmission channel management and equipment management and maintenance.

[0283] Eighth, compare the instantaneous reception of the physical medium signal PS0. out_r The noise ratio and the appropriate physical medium signal PSO out_i If the difference between the two is greater than the allowable range, the abnormality will be reported to the upper communication layer through the transmission channel quality signal QS0, so as to serve as a reference for transmission channel management and equipment management and maintenance.

[0284] In addition, refer to Figure 4 The system of this utility model may include the following steps in specific use, but is not limited thereto:

[0285] Step 1, provide a reference as follows Figure 4 The optical communication system 1.

[0286] Step Two: During the signal transmission process from the transmitting end signal processing unit 10 to the receiving end signal processing unit 30, the signal output and control circuit 13 of the transmitting end signal processing unit 10 receives the target transmission signal MS0 from the upper-level communication layer of the transmitting end and converts this target transmission signal MS0 into an analog electrical signal ES1 output to the optical signal driving and modulation circuits of each transmission channel. Each optical signal driving and modulation circuit generates and outputs the light source driving and modulation electrical signal ES20 of each transmission channel to the electrical signal to optical signal conversion unit 110 of each transmission channel. The electrical signal to optical signal conversion unit 110 of each transmission channel converts the light source driving and modulation electrical signal ES20 of each transmission channel into the optical signal LS of each transmission channel. The optical signal LS of each transmission channel is output to the receiving end signal processing unit 30 through the optical transmission channel 20 connecting the two signal processing units.

[0287] Step 3: The optical signals LS from each transmission channel entering the receiving end signal processing unit 30 are transmitted to the optical signal to electrical signal conversion unit 340 of each transmission channel. The optical signal to electrical signal conversion unit 340 of each transmission channel converts the optical signals LS of each transmission channel into analog current signals ES3 of each transmission channel. The transimpedance amplifier 35 of each transmission channel converts the analog current signals ES3 of each transmission channel into analog voltage signals ES4 of each transmission channel. The signal input and control circuit 36 ​​receives and analyzes the analog voltage signals ES4 of each transmission channel from the transimpedance amplifier 35, and obtains the target transmission signal MS and the transmission channel information signal CS of each transmission channel. The signal input and control circuit 36 ​​transmits the target transmission signal MS to the upper-level communication layer of the receiving end, thereby achieving the purpose of transmitting the target transmission signal MS. Furthermore, the signal input and control circuit 36 ​​also feeds back the transmission channel information signal CS of each transmission channel to the signal output and control circuit 13 of the transmitting end signal processing unit 10 at an appropriate time.

[0288] Step four, the signal output and control circuit 13 of the sending end signal processing unit 10 uses the received transmission channel information signal CS of each transmission channel to adjust the analog electrical signal ES1 of the optical signal drive and modulation circuit 12 subsequently output to each transmission channel, thereby maintaining or improving the communication quality of each transmission channel.

[0289] Furthermore, the signal output and control circuit 13 of the transmitting end signal processing unit 10 generates a transmission channel quality signal QS based on the transmission channel information signal CS of each transmission channel, and transmits the transmission channel quality signal QS to the upper-level communication layer of the transmitting end signal processing unit 10 for reference by the upper-level network layer in transmission channel management and equipment management and maintenance.

[0290] The appropriate timing for the signal input and control circuit 36 ​​of the receiving end signal processing unit 30 to feed back the transmission channel information signal CS of each transmission channel to the signal output and control circuit 13 of the transmitting end signal processing unit 10 includes a combination of at least one of the following groups:

[0291] Firstly, it is immediate.

[0292] Secondly, a specific cycle.

[0293] Third, when the average power of the optical signal LS received by the optical signal to electrical signal unit 340 of the receiving end signal processing unit 30 is abnormal.

[0294] Fourth, when the analog level of the optical signal LS corresponding to each digital signal received by the optical signal to electrical signal unit 340 of the receiving end signal processing unit 30 is abnormal.

[0295] Fifth, when the bit error rate of the analog voltage signal ES4 received by the signal input and control circuit 36 ​​from the transmission channel increases.

[0296] Sixth, when the noise ratio of the analog voltage signal ES4 received by the signal input and control circuit 36 ​​from the transmission channel increases.

[0297] Seventh, when the frequency response of the transmission channel is abnormal.

[0298] Eighth, when performing equipment diagnostics on the optical communication system 1.

[0299] Furthermore, the transmission channel information signal CS of each of the above transmission channels shall include a combination of at least one of the following groups:

[0300] Firstly, it represents the information on the average power of the optical signal LS received by the optical signal to electrical signal unit 340 of the transmission channel, which corresponds to the analog voltage signal ES4 output by the transimpedance amplifier 35 of the transmission channel.

[0301] Secondly, the analog voltage signal ES4 output by the transimpedance amplifier 35 of the transmission channel corresponds to the analog level information of the optical signal LS received by the optical signal to electrical signal unit 340 of the transmission channel, which corresponds to each digital signal digit (e.g., 0 and 1 of PAM2 or 00, 01, 10, 11, etc. of PAM4).

[0302] Third, the time-domain signal f of the analog voltage signal ES4 output by the transimpedance amplifier 35 representing the transmission channel during a certain time interval τ. out (t), or its spectral signal F out Information about (ω).

[0303] Fourth, the bit error rate of the analog voltage signal ES4 received by the signal input and control circuit 36 ​​from the transmission channel.

[0304] Fifth, the noise ratio of the signal input to the analog voltage signal ES4 received by the control circuit 36 ​​from the transmission channel.

[0305] The signal output and control circuit 13 of the transmitting end signal processing unit 10 further extracts partial characteristics of the analog electrical signal ES1 output to the optical signal driving and modulation circuit 12 of each transmission channel, compares it with the transmission channel information signal CS subsequently received from each transmission channel, and uses this analysis result to adjust the analog electrical signal ES1 subsequently output to the optical signal driving and modulation circuit 12 of each transmission channel, thereby maintaining or improving the signal quality of each transmission channel. The characteristics of the analog electrical signal ES1 output from each transmission channel by the signal output and control circuit 13 include a combination of at least one of the following groups:

[0306] Firstly, it represents the information of the DC bias electrical signal analog level of the electrical signal to optical signal unit 110 of the transmission channel in the analog electrical signal ES1 output by the signal output and control circuit 13 to the transmission channel.

[0307] Secondly, the information in the analog electrical signal ES1 output by the signal output and control circuit 13 to the transmission channel corresponds to the AC modulated electrical signal of the electrical signal to optical signal unit 110 of the transmission channel.

[0308] Thirdly, the information on the modulated analog signal level of the electrical signal to optical signal unit 110 corresponding to each digital signal digit of the transmission channel in the analog electrical signal ES1 output by the signal output and control circuit 13 to the transmission channel.

[0309] Fourth, it represents the corresponding f out (t) During the time interval τ, the analog electrical signal ES1 output by the signal output and control circuit 13 to the optical signal drive and modulation circuit 12 of the transmission channel is the time domain signal f. in (t), or its spectral signal F in Information about (ω).

[0310] Fifth, the frequency response of the transmission channel. Information.

[0311] The signal output and control circuit 13 of the transmitting end signal processing unit 10 further analyzes the information signal CS of each transmission channel and uses it to adjust the analog electrical signal ES1 output to the optical signal drive and modulation circuit 12 of each transmission channel in a manner that includes at least one of the following groups:

[0312] Firstly, when the average power of the optical signal LS detected by the optical signal to electrical signal unit 340 of the receiving end signal processing unit 30 is lower than expected, the analog electrical signal ES1 output by the transmitting end signal processing unit 10 to the optical signal driving and modulation circuit 12 is adjusted to increase the average power of the optical signal transmitted by the electrical signal to optical signal unit 110.

[0313] Secondly, when the average power of the optical signal LS detected by the optical signal to electrical signal unit 340 of the receiving end signal processing unit 30 is higher than expected, the analog electrical signal ES1 output by the transmitting end signal processing unit 10 to the optical signal driving and modulation circuit 12 is adjusted to reduce the average power of the optical signal LS transmitted by the electrical signal to optical signal unit 110.

[0314] Third, when the analog level of the optical signal corresponding to a certain digital signal detected by the optical signal to electrical signal unit 340 of the receiving end signal processing unit 30 is lower than expected, the analog electrical signal ES1 output by the transmitting end signal processing unit 10 to the optical signal driving and modulation circuit 12 is adjusted to increase the analog level of the optical signal LS output by the electrical signal to optical signal unit 110 of the transmitting end signal processing unit 10 corresponding to the digital signal.

[0315] Fourth, when the optical signal to electrical signal unit 340 of the receiving end signal processing unit 30 detects that the analog level of the optical signal corresponding to a certain digital signal is higher than expected, the analog electrical signal ES1 output by the transmitting end signal processing unit 10 to the optical signal driving and modulation circuit 12 is adjusted to reduce the analog level of the optical signal LS output by the electrical signal to optical signal unit 110 of the transmitting end signal processing unit 10 corresponding to the digital signal.

[0316] Fifth, the analog electrical signal ES1 output by the signal output and control circuit 13 of the transmitting end signal processing unit 10 to the optical signal driving and modulation circuit 12 is adjusted so that the power corresponding to the minimum digital signal of the optical signal LS transmitted by the electrical signal to optical signal unit 110 of this channel is zero. Therefore, the power of the minimum digital signal of the optical signal LS received by the optical signal to electrical signal unit 340 of the receiving end signal processing unit 30 is also zero.

[0317] Sixth, adjust the analog electrical signal ES1 output by the signal output and control circuit 13 of the transmitting end signal processing unit 10 to the optical signal driving and modulation circuit 12, so that the power of the maximum digital signal of the optical signal LS received by the optical signal to electrical signal unit 340 of the receiving end signal processing unit 30 is the minimum value that makes the analog voltage signal ES4 received by the signal input and control circuit 36 ​​at an acceptable bit error rate.

[0318] Seventh, adjust the analog electrical signal ES1 output by the signal output and control circuit 13 of the transmitting end signal processing unit 10 to the optical signal drive and modulation circuit 12 of the transmission channel, so that the power of the maximum digital signal of the optical signal LS received by the optical signal to electrical signal unit 340 of the receiving end signal processing unit 30 is the minimum value that makes the analog voltage signal ES4 received by the signal input and control circuit 36 ​​have an acceptable noise ratio.

[0319] Eighth, adjust the analog electrical signal ES1 output by the signal output and control circuit 13 of the transmitting end signal processing unit 10 to the optical signal drive and modulation circuit 12 of a certain transmission channel, so that the power of the optical signal LS transmitted by the electrical signal to optical signal unit 110 corresponds to the maximum digital signal power. Among them, P out_maxUnder conditions where appropriate signal transmission functionality is required, the minimum power of the optical signal LS that the optical signal to electrical signal unit 340 of the receiving end signal processing unit 30 can receive corresponds to the maximum digital signal bit. in_max_ - For the electrical signal to optical signal conversion unit 110 of the transmitting end signal processing unit 10, in a certain time period τ before, - The transmitted optical signal LS corresponds to the power of the maximum digital signal. F out_max_ - For the optical signal to electrical signal conversion unit 340 of the transmission channel of the receiving end signal processing unit 10, in the previous time period τ - The received optical signal LS corresponds to the power of the maximum digital signal.

[0320] Ninth, adjust the analog electrical signal ES1 output by the signal output and control circuit 13 of the transmitting end signal processing unit 10 to the optical signal drive and modulation circuit 12 of the transmission channel, so that the analog voltage levels corresponding to all adjacent large and small digital signal digits (such as between 00 and 01, 01 and 10, 10 and 11 in PAM4, etc.) of the analog voltage signal ES4 output by the transimpedance amplifier 35 of the subsequent receiving end signal processing unit 30 have equal differences. Taking the PAM4 digital signal as an example, the output voltage of the transimpedance amplifier 35 corresponding to the digit 00 is V. 00 The output voltage corresponding to digital 01 is V. 01 The corresponding output voltage for digital 10 is V. 10 The output voltage corresponding to digital 11 is V. 11 Then V 11 -V 10 =V 10 -V 01 =V 01 -V 00 .

[0321] Tenth, adjust the analog electrical signal ES1 output by the signal output and control circuit 13 of the transmitting end signal processing unit 10 to the optical signal drive and modulation circuit 12 of the transmission channel, so that the signal output and control circuit 13 of the transmitting end signal processing unit 10 is adjusted in a subsequent corresponding time period τ. + The time-domain signal of the analog electrical signal ES1 output to the optical signal drive and modulation circuit 12 of the transmission channel is: in, For the conversion of fulvegetal, For the inverse Furier transition. F in+ (ω)=F(f in+ (t) is f in+ The spectral signal of (t). out+ (t) represents the subsequent time interval τ in that corresponding time period. +To enable the signal input of the receiving end signal processing unit 30 and the control circuit 36 ​​to receive the time-domain signal of the analog voltage signal ES4 from the transimpedance amplifier 35 of the transmission channel, F out+ (ω)=F(f out+ (t) is its spectral signal. in- (t) represents a previous time interval τ - The time-domain signal of the analog electrical signal ES1 output by the signal output and control circuit 13 of the transmitting end signal processing unit 10 to the optical signal drive and modulation circuit 12 of each transmission channel, F in- (ω)=F(f in- (t) is its spectral signal. out- (t) represents the previous time interval τ - The time-domain signal of the analog voltage signal ES4 received by the signal input and control circuit 36 ​​of the receiving end signal processing unit 30 from the transimpedance amplifier 35 of the transmission channel, F out- (ω)=F(f out- (t) is its spectral signal. The signal output and control circuit 13 of the transmitting end signal processing unit 10 transmits f in+ The frequency response of the transmission channel stored at time (t).

[0322] Eleventh, if the optical signal driving and modulation circuit 12 modulates the pulse wave amplitude of the laser with the light source driving and modulation current, the analog electrical signal ES1 output by the signal output and control circuit 13 of the transmitting end signal processing unit 10 to the optical signal driving and modulation circuit 12 of the transmission channel is adjusted so that the analog level of the light source driving and modulation current corresponding to the minimum digital signal (e.g., 0 of PAM2 or 00 of PAM4) is slightly equal to or slightly greater than the critical current of the laser.

[0323] To further optimize the quality of each transmission channel of the optical communication system, the following transmission channel calibration and optimization procedures can be performed sequentially using the system of this embodiment.

[0324] Step 1: Before formal signal transmission, adjust the settings of the optical communication system to ensure that each transmission channel has appropriate signal transmission functionality. In this state, the signal input and control circuit 36 ​​of the receiving end signal processing unit 30 generates the transmission channel information signal CS for each transmission channel and feeds it back to the signal output and control circuit 13 of the transmitting end signal processing unit 10. The signal output and control circuit 13 of the transmitting end signal processing unit 10 captures and stores the characteristics of the analog electrical signal ES1 of each transmission channel, and acquires and stores the transmission channel information signal CS received from the signal input and control circuit 36. The transmission channel information signal CS acquired under this appropriate signal transmission functionality is defined as the appropriate transmission channel information signal CS. i The analog electrical signal ES1 of each transmission channel is defined as the analog electrical signal ES1 output by the appropriate signal output and control circuit. i The light source drive and modulation signal ES2 for each transmission channel is defined as the appropriate light source drive and modulation signal ES2. i The analog electrical signal ES4 of each transmission channel is defined as the analog voltage signal ES4 output by the appropriate transimpedance amplifier. i The light source drive and modulation signal ES20 for each transmission channel is defined as the appropriate light source drive and modulation signal ES20. i The optical signal LS transmitted by the electrical signal to optical signal unit 110 of each transmission channel is defined as the appropriate transmitted optical signal LS. in_i The optical signal LS received by the optical signal to electrical signal unit 340 of each transmission channel is defined as the appropriate received optical signal LS. out_i .

[0325] In step one, the condition that each transmission channel has the appropriate signal transmission function may include a combination of at least one of the following groups:

[0326] Firstly, if the optical signal driving and modulation circuit 12 modulates the pulse wave amplitude of the laser using the light source driving and modulation current, the appropriate light source driving and modulation current ES2 corresponding to the minimum digital signal (e.g., 0 in PAM2 or 00 in PAM4) i The simulated level is approximately equal to or slightly greater than the critical current of the laser.

[0327] Secondly, the appropriate transmitted optical signal LS output by the electrical signal to optical signal unit 110. in_i The analog level corresponding to the smallest digital signal digit (e.g., 0 in PAM2 or 00 in PAM4) is 0 or slightly greater than 0.

[0328] Third, the appropriate transmitted optical signal LS output by the electrical signal to optical signal unit 110. in_iThe analog level corresponding to the maximum digital signal digit (such as 1 in PAM2 or 11 in PAM4) is such that the signal input and the analog voltage signal ES4 output by the appropriate transimpedance amplifier received by the control circuit 36 ​​are synchronized. i The minimum value of the optical signal analog level corresponding to the maximum digital signal bit rate at an acceptable bit error rate.

[0329] Fourth, the appropriate transmitted optical signal LS output by the electrical signal to optical signal unit 110. in_i The analog level corresponding to the maximum digital signal digit (such as 1 in PAM2 or 11 in PAM4) is such that the signal input and the analog voltage signal ES4 output by the appropriate transimpedance amplifier received by the control circuit 36 ​​are synchronized. i The minimum value of the optical signal analog level corresponding to the maximum digital signal bit at an acceptable noise ratio.

[0330] Fifth, the output of the transimpedance amplifier 35 is an appropriate analog voltage signal ES4. i All adjacent digital signal digits (such as 0 and 1 in PAM2, or 00 and 01, 01 and 10, 10 and 11 in PAM4, etc.) have an equal difference between their corresponding analog voltage levels. Taking the PAM4 digital signal as an example, the output voltage of the transimpedance amplifier 35 corresponding to digit 00 is V. 00 The output voltage corresponding to digital 01 is V. 01 The corresponding output voltage for digital 10 is V. 10 The output voltage corresponding to digital 11 is V. 11 Then V 11 -V 10 =V 10 -V 01 =V 01 -V 00 .

[0331] Sixth, the signal input and control circuit 36 ​​receives the analog voltage signal ES4 from the output of the appropriate transimpedance amplifier. i The bit error rate is lower than the acceptable bit error rate.

[0332] Seventh, the signal input and control circuit 36 ​​receives the analog voltage signal ES4 from the output of the appropriate transimpedance amplifier. i The noise ratio is lower than the acceptable noise ratio.

[0333] Step 2: Analyze the appropriate transmission channel information signal CS for each transmission channel. i The appropriate signal output and control circuit of each transmission channel outputs analog electrical signal ES1. i To obtain channel information under the condition that each transmission channel has appropriate transmission signal function, it may include a combination of at least one of the following groups:

[0334] Firstly, the appropriate signal output and control circuit 13 outputs the analog electrical signal ES1. i In the middle, the appropriate light source driving and modulation signal ES20 received by the electrical signal to optical signal unit 110 corresponding to the transmission channel. i The information of the analog level of the DC bias electrical signal.

[0335] Secondly, the appropriate signal output and control circuit 13 outputs the analog electrical signal ES1. i In the middle, the appropriate light source driving and modulation signal ES20 received by the electrical signal to optical signal unit 110 corresponding to the transmission channel. i Information about AC modulated electrical signals.

[0336] Thirdly, the appropriate signal output and control circuit 13 outputs the analog electrical signal ES1. i In this process, the electrical signal to optical signal unit 110 corresponding to the transmission channel outputs an appropriate transmit optical signal LS. in_i The power is information about the average optical power.

[0337] Fourth, the appropriate signal output and control circuit outputs analog electrical signal ES1, representing the output of signal output and control circuit 13. i In the middle, the corresponding electrical signal to optical signal conversion unit 110 outputs an appropriate transmitted optical signal LS. in_i The power is the information of the optical power corresponding to each digital signal.

[0338] Fifth, the appropriate analog voltage signal ES4 output by the transimpedance amplifier 35. i In the middle, the corresponding optical signal to electrical signal unit 340 receives the appropriate received optical signal LS. out_i The power is information about the average optical power.

[0339] Sixth, representing the appropriate analog voltage signal ES4 output by the transimpedance amplifier 35. i In the middle, the corresponding optical signal to electrical signal unit 340 receives the appropriate received optical signal LS. out_i The power is the information of the optical power corresponding to each digital signal.

[0340] Seventh, the analog voltage signal ES4 is received by the appropriate transimpedance amplifier of the signal input and control circuit 36. i Information on the bit error rate.

[0341] Eighth, the analog voltage signal ES4 is received by the appropriate transimpedance amplifier of the signal input and control circuit 36. i Information on the noise ratio.

[0342] Ninth, the analog electrical signal ES1 output by the appropriate signal output and control circuit 13 is represented by the signal output and control circuit 13. i In, corresponding to a certain time interval τ i The time-domain signal f in_i (t), or its spectral signal F in_i Information about (ω).

[0343] Tenth, representing the analog voltage signal ES4 output by the appropriate transimpedance amplifier received by the signal input and control circuit 36. i In the middle, corresponding to the time interval τ i The time-domain signal f out_i (t), or its spectral signal F out_i Information about (ω).

[0344] Eleventh, representing the appropriate transmission frequency response of the transmission channel. Information.

[0345] Step 3: Setting up the optical transmission channel 20 that connects the two signal processing units.

[0346] Step four: During subsequent signal transmission, the signal input and control circuit 36 ​​of the receiving end signal processing unit 30 generates transmission channel information signals CS for each transmission channel and feeds them back to the signal output and control circuit 13 of the transmitting end signal processing unit 10. The signal output and control circuit 13 of the transmitting end signal processing unit 10 captures and stores the characteristics of the analog electrical signal ES1 of each transmission channel, and acquires and stores the transmission channel information signals CS received from the signal input and control circuit 36 ​​for each transmission channel. The transmission channel information signals CS acquired in real time during subsequent signal transmission are defined as real-time transmission channel information signals CS. i The analog electrical signal ES1 of each transmission channel is defined as the analog electrical signal ES1 output by the instantaneous signal output and the control circuit output. i The light source drive and modulation signal ES2 for each transmission channel is defined as the instantaneous light source drive and modulation signal ES2. i The analog electrical signal ES4 of each transmission channel is defined as the analog voltage signal ES4 output by the instantaneous transimpedance amplifier. i The light source drive and modulation signal ES20 for each transmission channel is defined as the instantaneous light source drive and modulation signal ES20. i The optical signal LS transmitted by the electrical signal to optical signal unit 110 of each transmission channel is defined as the instantaneous transmission optical signal LS. in_i The optical signal LS received by the optical signal to electrical signal unit 340 of each transmission channel is defined as the instantaneous received optical signal LS. out_i .

[0347] Step 5: During subsequent signal transmission, the signal output and control circuit 13 of the transmitting end signal processing unit 10 analyzes the real-time transmission channel information signal CS of each received transmission channel. r The real-time signal output of each transmission channel and the analog electrical signal ES1 output by the control circuit. r To obtain real-time channel information for each transmission channel, which may include a combination of at least one of the following groups:

[0348] Firstly, the real-time signal output and control circuit output analog electrical signal ES1 represents the output of the signal output and control circuit 13. r In the middle, the instantaneous light source drive and modulation signal ES20 received by the electrical signal to optical signal unit 110 corresponding to the transmission channel. r The information of the analog level of the DC bias electrical signal.

[0349] Secondly, the real-time signal output and control circuit output analog electrical signal ES1 represents the output of the signal output and control circuit 13. r In the middle, the instantaneous light source drive and modulation signal ES20 received by the electrical signal to optical signal unit 110 corresponding to the transmission channel. r Information about AC modulated electrical signals.

[0350] Thirdly, the real-time signal output and control circuit output analog electrical signal ES1 represents the output of the signal output and control circuit 13. r In this process, the electrical signal to optical signal unit 110 corresponding to the transmission channel outputs an instantaneous transmission optical signal LS. in_r The power is information about the average optical power.

[0351] Fourth, the real-time signal output and control circuit output analog electrical signal ES1 represents the output of the signal output and control circuit 13. r In the middle, the corresponding electrical signal to optical signal conversion unit 110 outputs an instantaneous optical signal LS. in_r The power is the information of the optical power corresponding to each digital signal.

[0352] Fifth, the instantaneous analog voltage signal ES4 output by the transimpedance amplifier 35 represents the output of the transimpedance amplifier. r In the middle, corresponding to the real-time received optical signal LS received by the optical signal to electrical signal unit 340. out_r The power is information about the average optical power.

[0353] Sixth, representing the instantaneous analog voltage signal ES4 output by the transimpedance amplifier 35. r In the middle, corresponding to the real-time received optical signal LS received by the optical signal to electrical signal unit 340. out_rThe power is the information of the optical power corresponding to each digital signal.

[0354] Seventh, the analog voltage signal ES4 received by the instantaneous transimpedance amplifier from the signal input and control circuit 36 ​​represents the input of the analog voltage signal ES4. r Information on bit error rate.

[0355] Eighth, the analog voltage signal ES4 received by the instantaneous transimpedance amplifier from the signal input and control circuit 36 ​​represents the input of the analog voltage signal ES4. r Information on the noise ratio.

[0356] Ninth, representing the analog electrical signal ES1 output by the instantaneous signal output and control circuit 13. r In, corresponding to a certain time interval τ i The time-domain signal f in_r (t), or its spectral signal F in_r Information about (ω).

[0357] Tenth, representing the analog voltage signal ES4 output by the instantaneous transimpedance amplifier received by the signal input and control circuit 36. r In the middle, corresponding to the time interval τ i The time-domain signal f out_r (t), or its spectral signal F out_r Information about (ω).

[0358] Eleventh, representing the instantaneous transmission frequency response of the transmission channel. Information.

[0359] Step six: The signal output and control circuit 13 of the transmitting end signal processing unit 10 compares and analyzes the appropriate transmission channel information of each transmission channel obtained in step two with the real-time transmission channel information of each transmission channel obtained in step five. Based on the comparison and analysis results, it adjusts the analog electrical signal ES1 output by the signal output and control circuit 13 to each transmission channel to improve the quality of each transmission channel, or the signal output and control circuit 13 generates a transmission channel quality signal QS to inform the upper-level communication layer of the quality status of each channel. This signal may include a combination of at least one of the following groups:

[0360] Firstly, if the optical signal LS is received immediately... out_r Average power P out_avg_r Below the appropriate received optical signal LS out_i Average power P out_avg_i Then, the analog electrical signal ES1 output by the transmitting end signal processing unit 10 to the optical signal driving and modulation circuit 12 of the transmission channel is adjusted to increase the average power of the optical signal LS transmitted by the electrical signal to optical signal unit 110 of the transmission channel.

[0361] Secondly, if the optical signal LS is received immediately... out_r Average power P out_avg_r Higher than the appropriate received optical signal LS out_i Average power P out_avg_i If the analog electrical signal ES1 output by the transmitting end signal processing unit 10 to the optical signal driving and modulation circuit 12 of the transmission channel is adjusted, the average power of the optical signal LS transmitted by the electrical signal to optical signal unit 110 of the transmission channel will be reduced.

[0362] Third, if the optical signal LS is received immediately out_r The optical power of a certain digital signal is lower than that of a suitable received optical signal LS. out_i If the optical power of the corresponding digital signal is obtained, the analog electrical signal ES1 output by the transmitting end signal processing unit 10 to the optical signal drive and modulation circuit 12 of the transmission channel is adjusted to increase the optical power of the corresponding digital signal of the optical signal received by the optical signal to electrical signal unit 340.

[0363] Fourth, if the optical signal LS is received immediately out_r The optical power of a certain digital signal is higher than that of a suitable received optical signal LS. out_i If the optical power of the corresponding digital signal is reduced, the analog electrical signal ES1 output by the transmitting end signal processing unit 10 to the optical signal drive and modulation circuit 12 of the transmission channel is adjusted to reduce the optical power of the corresponding digital signal of the optical signal received by the optical signal to electrical signal unit 340.

[0364] Fifth, if the instantaneous optical signal energy loss... Greater than the appropriate optical signal energy loss This anomaly is then communicated to the higher-level communication layer via the transmission channel quality signal (QS) for reference in transmission channel management and equipment maintenance. Among these, P... in_avg_r For this instantaneous transmission of optical signal LS in_r Average power, P out_avg_r For the instantaneous reception of optical signal LS out_r Average power, P in_avg_i For the appropriate transmission of optical signal LS in_i Average power, P out_avg_i For this appropriate reception of optical signal LS out_i The average power.

[0365] Sixth, compare the instantaneous frequency response. With appropriate frequency response If the difference between the two exceeds the allowable range, this anomaly is reported to the upper-level communication layer via the transmission channel quality signal (QS) for reference in transmission channel management and equipment maintenance. Wherein, f in_r(t) represents the analog electrical signal ES1 output by the instantaneous signal output and control circuit. i For comparison, a certain time interval τ before the comparison r The time-domain signal, F in_r (ω)=F(f in_r (t) is its spectral signal. in_i (t) represents the analog electrical signal ES1 output by the instantaneous signal output and control circuit. i In another time period τ i The time-domain signal, F in_i (ω)=F(f in_i (t) is its spectral signal. out_r (t) represents the analog voltage signal ES4 output by the instantaneous transimpedance amplifier. i Corresponding to time segment τ r The time-domain signal, F out_r (ω)=F(f out_r (t)) its spectral signal. f out_i (t) represents the analog voltage signal ES4 output by the appropriate transimpedance amplifier. i Corresponding to time segment τ i The time-domain signal, F out_i (ω)=F(f out_i (t) is its spectral signal.

[0366] Seventh, compare the output analog voltage signal ES4 of the appropriate transimpedance amplifier. r The bit error rate and the appropriate transimpedance amplifier output analog voltage signal ES4 i If the difference between the two exceeds the allowable range, the abnormality will be reported to the upper communication layer via the transmission channel quality signal QS, so as to serve as a reference for transmission channel management and equipment management and maintenance.

[0367] Eighth, compare the output analog voltage signal ES4 of the appropriate transimpedance amplifier. r The noise ratio and the appropriate transimpedance amplifier output analog voltage signal ES4 i If the difference between the two is greater than the allowable range, the abnormality will be reported to the upper communication layer through the transmission channel quality signal QS, so as to serve as a reference for transmission channel management and equipment management and maintenance.

[0368] The above are merely preferred embodiments of the present utility model and are illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalent alterations can be made to the present utility model within the spirit and scope defined by the claims, but all such changes will fall within the protection scope of the present utility model.

Claims

1. A system for improving communication quality, characterized in that, The system includes a transmitting signal processing unit, at least one transmission channel connecting two signal processing units, and at least one receiving signal processing unit. The transmitting signal processing unit receives a target transmission signal from an upper-level communication layer at the transmitting end and converts the target transmission signal into a corresponding physical medium signal that can be transmitted in each of the transmission channels connecting the two signal processing units. Each transmission channel connecting the two signal processing units transmits each physical medium signal to each receiving signal processing unit. Each receiving signal processing unit obtains the target transmission signal and the transmission channel information signal of each transmission channel based on the physical medium signal. Each receiving signal processing unit transmits the target transmission signal to the upper-level communication layer at the receiving end to achieve the purpose of transmitting the target transmission signal. Each receiving signal processing unit also feeds back the transmission channel information signal of each transmission channel to the transmitting signal processing unit.

2. The system as described in claim 1, characterized in that, The two signal processing units also transmit signals to each other through a transmission channel connecting the two signal processing units. The system includes two signal processing units, and at least one transmission channel connects the two signal processing units. Each signal processing unit includes a transmitting signal processing unit and a receiving signal processing unit. Each transmitting signal processing unit receives a target transmission signal from the upper-level communication layer and converts it into a physical medium signal for each transmission channel, transmitting it to the receiving signal processing unit of the other signal processing unit through the transmission channel connecting the two signal processing units. Each receiving signal processing unit transmits the received target transmission signal to its upper-level communication layer to complete the transmission of the target transmission signal. Each receiving signal processing unit also transmits the transmission channel information signal of each transmission channel from the signal processing unit to the other signal processing unit, as well as the transmission channel information signal from the other signal processing unit to the receiving signal processing unit. The transmission channel information signal of each transmission channel of the signal sent by the signal processing unit is transmitted to the transmitting end signal processing unit of the signal processing unit; each transmitting end signal processing unit adjusts the physical medium signal to be transmitted subsequently based on the transmission channel information signal of each transmission channel of the signal sent by the signal processing unit to the other signal processing unit; wherein each transmitting end signal processing unit also receives the target transmission signal from the upper-level communication layer of the signal processing unit, converts it into a physical medium signal, and transmits it to the receiving end signal processing unit of the other signal processing unit through each transmission channel connecting the two signal processing units; each transmitting end signal processing unit splits the transmission channel information signal of each transmission channel of the signal sent by the other signal processing unit to the signal processing unit and the target transmission signal together into the physical medium signal of each transmission channel, and transmits it to the receiving end signal processing unit of the other signal processing unit through each transmission channel connecting the two signal processing units.

3. The system as described in claim 1, characterized in that, Each transmission channel connecting two signal processing units is an optical transmission channel; the system includes a transmitting signal processing unit, at least one optical transmission channel connecting two signal processing units, and at least one receiving signal processing unit; wherein, the transmitting signal processing unit further includes a signal output and control circuit, at least one optical signal driving and modulation circuit, and at least one electrical signal to optical signal conversion unit; wherein, the signal output and control circuit is used to receive the target transmission signal from the upper-level network layer of the transmitting signal processing unit and the information signal of each transmission channel from the transmitting signal processing unit, and to convert the target signal into an optical signal based on the information signal of each transmission channel. The standard transmission signal is converted into an analog electrical signal output to the optical signal drive and modulation circuit of each transmission channel; wherein, the optical signal drive and modulation circuit of each transmission channel is used to convert the analog electrical signal from the signal output and control circuit of each transmission channel into a light source drive and modulation electrical signal output to each electrical signal to optical signal unit; each electrical signal to optical signal unit is used to convert the light source drive and modulation electrical signal from the optical signal drive and modulation circuit of each transmission channel into an optical signal of each transmission channel and send it to the optical transmission channel of each transmission channel; each optical transmission channel connecting two signal processing units Each of the transmission channels is used to transmit optical signals from the transmitting end signal processing unit to the receiving end signal processing unit; each receiving end signal processing unit includes at least one optical signal to electrical signal unit, at least one transimpedance amplifier, and a signal input and control circuit; wherein each optical signal to electrical signal unit is used to convert the optical signal from each transmission channel into an analog current signal for each transmission channel; wherein each transimpedance amplifier for each transmission channel is used to convert the analog current signal from each optical signal to electrical signal unit into an analog voltage signal for each transmission channel and transmit it to the signal input control circuit; each The signal input and control circuit transmits each target transmission signal to the upper-level communication layer of each receiving end to achieve the purpose of transmitting each target transmission signal. Each signal input and control circuit also forms a transmission channel information signal for each transmission channel based on the acquired transmission channel information, and feeds back the transmission channel information signal for each transmission channel to the signal output and control circuit of the transmitting end signal processing unit, so that the signal output and control circuit can adjust the analog electrical signal subsequently output to the optical signal driving and modulation circuit of each transmission channel according to the transmission channel information signal of each transmission channel.

4. The system as described in claim 3, characterized in that, The system can also generate optical signals using external modulation. Each of the electrical signal to optical signal units of the transmitting end signal processing unit includes a light source to receive a light source driving signal from the optical signal driving and modulation circuit to generate a continuous light wave. Each of the electrical signal to optical signal units of the transmitting end signal processing unit also includes an external optical signal modulator to receive a light source modulation signal from the optical signal driving and modulation circuit, thereby modulating the continuous light wave of the signal of each transmission channel to generate the optical signal of each transmission channel.

5. The system as described in claim 3, characterized in that, Optical signals from at least two transmission channels share the same optical transmission channel that connects two signal processing units.

6. The system as described in claim 5, characterized in that, The optical signals generated by each of the electrical signal to optical signal conversion units of the optical transmission channel that shares the same connection between the two signal processing units have different wavelengths or polarization characteristics. Each of the optical transmission channels connecting the two signal processing units as a common optical transmission channel has at least one optical combiner at one end of the transmitting signal processing unit. The optical combiner combines optical signals of different wavelengths or polarization characteristics from each of the optical transmission channels that share the same optical transmission channel connecting the two signal processing units into the optical transmission channel that serves as a common optical transmission channel connecting the two signal processing units.

7. The system as described in claim 5, characterized in that, The light sources of at least two electrical signal to optical signal units in each transmission channel sharing the same optical transmission channel connecting two signal processing units receive light source drive signals from the optical signal drive and modulation circuit of the corresponding transmission channel to generate continuous light waves of the corresponding transmission channel; wherein each continuous light wave has different wavelengths or polarization characteristics; the transmitting end signal processing unit also includes at least one common optical transmission channel and at least one optical combiner; each optical combiner causes continuous light waves with different wavelengths or polarization characteristics of each transmission channel sharing the same optical transmission channel connecting two signal processing units to converge into each common optical transmission channel; the continuous light waves of each transmission channel sequentially pass through a designated channel external optical signal modulator of the corresponding transmission channel on the common optical transmission channel; each designated channel external optical signal modulator receives light source modulation signals from the optical signal drive and modulation circuit of the corresponding transmission channel and modulates only the continuous light waves of the corresponding transmission channel to generate the optical signal of the corresponding transmission channel. The optical signal of each of the shared optical transmission channels enters the same optical transmission channel that connects the two signal processing units.

8. The system as described in claim 5, characterized in that, The transmitting end signal processing unit has at least one multi-transmission channel light source; each of the multi-transmission channel light sources receives a light source driving signal from each of the optical signal driving and modulation circuits to generate at least two continuous light waves with different wavelengths or polarization characteristics for each of the transmission channels; the continuous light waves of each transmission channel generated by the same multi-transmission channel light source pass sequentially through a designated channel external optical signal modulator of each corresponding transmission channel in the same common optical transmission channel; each designated channel external optical signal modulator receives a light source modulation signal from the optical signal driving and modulation circuit of the corresponding transmission channel and modulates only the continuous light waves of the corresponding transmission channel to generate the optical signal of the corresponding transmission channel; The optical signal of each of the shared optical transmission channels enters the same optical transmission channel that connects the two signal processing units.

9. The system as described in claim 5, characterized in that, Each optical transmission channel that serves as a common optical transmission channel connecting two signal processing units has at least one optical splitter at one end of the receiving signal processing unit; each optical splitter splits optical signals of different wavelengths or polarization characteristics of each transmission channel that shares the same optical transmission channel connecting two signal processing units, and transmits them to the optical signal to electrical signal unit of each corresponding transmission channel respectively.

10. The system as described in claim 5, characterized in that, The optical signal of each transmission channel of the optical transmission channel that shares the same connection between the two signal processing units enters a common optical transmission channel of the receiving signal processing unit; the optical signal of each transmission channel passes sequentially through a designated channel detector corresponding to each transmission channel in the common optical transmission channel; the designated channel detector of each transmission channel only performs absorption detection on the optical signal of the corresponding transmission channel, and thus generates an analog current signal of the corresponding transmission channel, and transmits the analog current signal to each transimpedance amplifier of the corresponding transmission channel.

11. The system as described in claim 3, characterized in that, The system also includes two signal processing units, and the two signal processing units transmit signals to each other through at least one optical transmission channel connecting the two signal processing units. Each of the two signal processing units includes a signal output and control circuit, at least one optical signal driving and modulation circuit, at least one electrical signal to optical signal unit, at least one optical signal to electrical signal unit, at least one transimpedance amplifier, and a signal input and control circuit. Each receiving signal processing unit transmits the received target transmission signal to its upper-level communication layer to complete the transmission of the target transmission signal. Each receiving signal processing unit transmits information signals from each transmission channel of the signal transmitted from itself to the other signal processing unit, and information signals from each transmission channel of the signal transmitted from the other signal processing unit to itself. The information signal is transmitted to the signal output and control circuit of the same signal processing unit; the signal output and control circuit of each signal processing unit is used to adjust the analog electrical signal subsequently output to the optical signal driving and modulation circuit of each transmission channel according to the transmission channel information signal of each transmission channel that transmits the signal from the signal processing unit to another signal processing unit; the signal output and control circuit of each signal processing unit also receives the target transmission signal from the upper-level communication layer of the signal processing unit, converts it into an analog electrical signal that is transmitted to the optical signal driving and modulation circuit of each transmission channel, and transmits it to another signal processing unit; the signal output and control circuit of each signal processing unit loads the transmission channel information signal of each transmission channel that sends the signal from another signal processing unit to the signal processing unit and the target transmission signal together into the analog electrical signal output to the optical signal driving and modulation circuit of each transmission channel, and transmits it to another signal processing unit.

12. The system as claimed in claim 11, characterized in that, At least one optical transmission channel connects two signal processing units, enabling the two signal processing units to transmit signals to each other through this optical transmission channel. Each of the two signal processing units has at least one transmission channel that transmits signals through this optical transmission channel, which serves as a common optical transmission channel for each of the two signal processing units. The optical signals generated by the electrical signal-to-optical signal conversion unit of each transmission channel (which serves as a common optical transmission channel) in all signal processing units have different wavelengths or polarization characteristics. Each optical transmission channel (which serves as a common optical transmission channel) has an optical multiplexer at each end connected to the two signal processing units. Each optical multiplexer causes all optical signals from the connected signal processing units sharing the optical transmission channel to enter the optical transmission channel, and causes all optical signals from the other signal processing unit sharing the optical transmission channel to be transmitted to the corresponding optical signal-to-electrical signal conversion unit in the corresponding transmission channel of the signal processing unit.

Images