Optical communication module and optical communication system using the same

Abstract

The present invention discloses an optical communication module and an optical communication system using the optical communication module. The optical communication module has an outer shape formed based on standard specifications, can communicate with a circuit substrate on a host side equipped with the optical communication module via a predetermined communication interface, inputs a light source signal to the circuit substrate via an optical transmitting unit, couples light source signals of different wavelengths into the same optical fiber, and attaches them to an optical carrier for transmission, divides the light source signal into I / Q components through a modulator, and attaches the I / Q components to an optical carrier, transmits the light source signal through the optical fiber, and an optical receiving unit is used to receive the light source signal and convert it into an electrical signal. The present invention relates to the field of optical communication technology; the optical communication module and the optical communication system using the optical communication module analyze and judge the light signal during the transmission process, and then perform signal processing and reinforcement to monitor the standard of signal output.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technology, and in particular to an optical communication module and an optical communication system using the optical communication module. Background Art

[0002] In the half century since the birth of the Internet, the transmission speed and capacity of communication networks have increased exponentially. In recent years, the emergence and development of high-definition video playback, augmented reality technology, cloud computing technology, big data, artificial intelligence and the Internet of Things have further promoted the continuous growth of network business traffic. In the existing optical communication technology, the optical signal in the transmission is asymmetric due to the bending of the optical fiber, and has different refractive indices in different directions, which will lead to differences in propagation constants in two polarization directions, resulting in time delay difference, which seriously limits the system capacity and transmission distance. Therefore, an optical communication module and an optical communication system using the optical communication module are proposed. Summary of the invention

[0003] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0004] An optical communication system comprises an optical transmitting unit, a wavelength division multiplexing unit, a light source modulation unit, an optical fiber amplification unit, a wavelength division multiplexing unit, a light source detection unit, a light source demodulation unit, a light receiving unit and a light source signal processing unit;

[0005] The optical transmission unit includes a plurality of light source transmission signals of different wavelengths, and is used to receive a plurality of electrical signals, and convert the light source transmission signals into light source signals, and inject them into the optical fiber for transmission;

[0006] The wavelength division multiplexing unit is used to couple several light source signals of different wavelengths into the same optical fiber and attach them to the optical carrier for transmission, thereby doubling the transmission capacity.

[0007] The light source modulation unit is provided with a modulator outside the light source, and an electrical digital signal is applied to the modulator as a modulation signal, so that after the light source signal from the optical carrier passes through the modulator, the parameters of the output light source signal are changed into I / Q components along with the modulation signal;

[0008] The optical fiber amplifier unit performs full optical amplification on the light source signal processed by the light source modulation unit. This is done by applying the energy of the pump light to the light source signal to amplify the energy of the light source signal. The light signal will attenuate during transmission in the optical fiber. The optical signal can be relayed and amplified by the optical fiber amplifier without the need for optical-electrical-optical conversion, which increases the transmission rate and has good "transparency". It is particularly suitable for relay amplification in long-distance optical communications.

[0009] The wavelength division and demultiplexing unit is used to decompose the light source signal coupled into the same optical fiber and attached to the optical carrier for transmission into its original individual light source signals.

[0010] Preferably, the light source detection unit is used to detect the light source signal power incident on its surface and record the light source signal power;

[0011] The light source demodulation unit is used to match the light source signal detected in the light source detection unit with its used power, and combine the matched I / Q components into the light source signal;

[0012] The light receiving unit includes a plurality of light source receiving signals, which are used to receive a plurality of light source signals of different wavelengths and convert the light source signal output into an electrical signal;

[0013] The light source signal processing unit is used to process the damage suffered by the light source signal in the transmission optical fiber link, including signal attenuation, dispersion reduction, I / Q component imbalance and frequency deviation caused by the difference between the local oscillator light and the optical carrier frequency.

[0014] Preferably, the output end of the optical emitting unit is connected to the input end of the wavelength division multiplexing unit, the output end of the wavelength division multiplexing unit is connected to the input end of the light source modulation unit, the output end of the light source modulation unit is connected to the input end of the optical fiber amplification unit, the output end of the optical fiber amplification unit is connected to the input end of the wavelength division multiplexing unit, the optical fiber amplification unit and the optical signal processing unit are connected to each other, the output end of the wavelength division multiplexing unit is connected to the input end of the light source detection unit, the output end of the light source detection unit is connected to the input end of the light source demodulation unit and the optical signal processing unit, and the output end of the light source demodulation unit is connected to the input end of the optical receiving unit.

[0015] Preferably, the optical signal processing unit includes an input module, a light source signal compensation module, a dispersion compensation module, a polarization equalization module, a carrier frequency deviation detection module, a signal judgment module and an output module, and the light source signal compensation module is used to supplement the optical signal intensity in the optical fiber transmission length;

[0016] The dispersion compensation module is used to deal with the dispersion increase problem caused by the optical fiber transmission length during the transmission of the light source signal, so as to offset the dispersion by emitting zero dispersion wavelength, which is conducive to fast optical fiber communication;

[0017] The polarization equalization module is used to solve the problem of differences in polarization propagation constants of I / Q components caused by external bending factors during the transmission of I / Q components in optical fiber communication lines;

[0018] Between the fiber segments, there will be a propagation constant difference between the two polarization states, and its value is random. The method of expressing the polarization of the I / Q component is generally to take its average value. Now the polarization coefficient of single-mode fiber is in the order of magnitude of We can calculate the polarization state value through polarization description, and the polarization description formula is as follows: Where A i represents the group delay between two polarization states,

[0019]

[0020] is the phase shift of the optical signal in the x direction during transmission. Q is the phase shift of the optical signal in the y direction during transmission. θ represents the rotation between two polarization states.

[0021] Preferably, the carrier frequency deviation detection module is used to solve the signal distortion caused by signal instability due to multipath propagation during the transmission process, control the data bit error rate, and ensure the signal reception performance;

[0022] The signal judgment module judges the optical signal after multiple processing to confirm the transmission performance of the optical signal.

[0023] Preferably, the output end of the input module is connected to the input end of the light source signal compensation module, the output end of the light source signal compensation module is connected to the input end of the dispersion compensation module, the output end of the dispersion compensation module is connected to the input end of the polarization equalization module, the output end of the polarization equalization module is connected to the input end of the carrier frequency deviation detection module, the output end of the carrier frequency deviation detection module is connected to the input end of the signal judgment module, and the output end of the signal judgment module is connected to the input end of the output module.

[0024] The application of an optical communication system in an optical communication module has an outer shape formed based on standard specifications, and can communicate with a circuit substrate on the host side of the optical communication module via a predetermined communication interface. A light source signal is input to the circuit substrate through an optical transmitting unit, and a plurality of light source signals of different wavelengths are coupled to the same optical fiber, and attached to an optical carrier for transmission. The light source signal is divided into I / Q components through a modulator, and the I / Q components are attached to an optical carrier, and the light source signal is transmitted through the optical fiber. The light receiving unit is used to receive the light source signal and convert it into an electrical signal.

[0025] The invention provides an optical communication module and an optical communication system using the optical communication module. A wavelength division multiplexing unit is used for coupling a plurality of light source signals of different wavelengths into the same optical fiber, and attaching the light source signals to an optical carrier for transmission, so as to achieve the effect of doubling the transmission capacity. The optical signal is relayed and amplified by an optical fiber amplifier, and no optical-electrical-optical conversion is required, so that the transmission rate is improved and the module has good "transparency", and is particularly suitable for relay amplification of long-distance optical communication. A light source detection unit is used for detecting the light source signal power incident on its surface, and recording the light source signal power, and transmitting the light source signal to a light source signal processing unit for signal processing to ensure the signal output power. The asymmetry of the optical fiber structure and the medium, and the difference in propagation constants of two polarization directions caused by different refractive indices in different directions are solved by the calculation, so as to ensure the time delay performance, thereby ensuring the system capacity and the transmission distance. The asymmetry of the optical fiber structure and the medium, and the difference in propagation constants of two polarization directions caused by different refractive indices in different directions are solved by the polarization description formula, so as to make the I / Q component polarization balanced, ensure the time delay performance, thereby ensuring the system capacity and the transmission distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A block diagram of the optical communication system provided by the present invention;

[0027] Figure 2 A system block diagram of a light source signal processing unit provided by the present invention;

[0028] Figure 3 This is a light source signal communication circuit diagram provided by the present invention. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] Embodiment 1:

[0031] See also Figure 1-3 , this embodiment provides a technical solution based on the first embodiment: an optical communication system, including an optical transmitting unit, a wavelength division multiplexing unit, a light source modulation unit, an optical fiber amplification unit, a wavelength division multiplexing unit, a light source detection unit, a light source demodulation unit, a light receiving unit and a light source signal processing unit;

[0032] The optical transmission unit includes a plurality of light source transmission signals of different wavelengths, and is used to receive a plurality of electrical signals, and convert the light source transmission signals into light source signals and inject them into the optical fiber for transmission;

[0033] The wavelength division multiplexing unit is used to couple several light source signals of different wavelengths into the same optical fiber and attach them to the optical carrier for transmission. By coupling several light source signals of different wavelengths, the transmission capacity can be doubled.

[0034] The light source modulation unit is provided with a modulator outside the light source, and an electrical digital signal is applied to the modulator as a modulation signal, so that after the light source signal from the optical carrier passes through the modulator, the parameters of the output light source signal are changed into I / Q components along with the modulation signal;

[0035] The optical fiber amplifier unit performs full optical amplification on the light source signal processed by the light source modulation unit. This is done by applying the energy of the pump light to the light source signal to amplify the energy of the light source signal. The light signal will attenuate during transmission in the optical fiber. The optical signal can be relayed and amplified by the optical fiber amplifier without the need for optical-electrical-optical conversion, which increases the transmission rate and has good "transparency". It is particularly suitable for relay amplification in long-distance optical communications.

[0036] The wavelength division and demultiplexing unit is used to decompose the light source signal coupled into the same optical fiber and attached to the optical carrier for transmission into its original individual light source signals.

[0037] In this embodiment, the light source detection unit is used to detect the power of the light source signal incident on its surface and record the light source signal power. When the power data cannot be used, the light source signal is transmitted to the light source signal processing unit for signal processing to ensure the signal output power.

[0038] The light source demodulation unit is used to match the light source signal detected in the light source detection unit with its used power, and combine the matched I / Q components into the light source signal;

[0039] The light receiving unit includes a plurality of light source receiving signals, which are used to receive a plurality of light source signals of different wavelengths and convert the light source signal output into an electrical signal;

[0040] The light source signal processing unit is used to process the damage suffered by the light source signal in the transmission optical fiber link, including signal attenuation, dispersion reduction, I / Q component imbalance and frequency deviation caused by the difference between the local oscillator light and the optical carrier frequency.

[0041] In this embodiment, the output end of the optical transmitting unit is connected to the input end of the wavelength division multiplexing unit, the output end of the wavelength division multiplexing unit is connected to the input end of the light source modulation unit, the output end of the light source modulation unit is connected to the input end of the optical fiber amplification unit, the output end of the optical fiber amplification unit is connected to the input end of the wavelength division multiplexing unit, the optical fiber amplification unit and the optical signal processing unit are connected to each other, the output end of the wavelength division multiplexing unit is connected to the input end of the light source detection unit, the output end of the light source detection unit is connected to the input end of the light source demodulation unit and the optical signal processing unit, and the output end of the light source demodulation unit is connected to the input end of the optical receiving unit.

[0042] In this embodiment, the optical signal processing unit includes an input module, a light source signal compensation module, a dispersion compensation module, a polarization equalization module, a carrier frequency deviation detection module, a signal judgment module and an output module. The light source signal compensation module is used to supplement the light signal intensity in the optical fiber transmission length; the dispersion compensation module is used to process the dispersion increase problem caused by the optical fiber transmission length during the transmission of the light source signal, thereby emitting a zero dispersion wavelength and offsetting the dispersion, which is conducive to fast optical fiber communication;

[0043] The polarization equalization module is used to solve the problem of differences in polarization propagation constants of I / Q components caused by external bending factors during the transmission of I / Q components in optical fiber communication lines;

[0044] Between the fiber segments, there will be a propagation constant difference between the two polarization states, and its value is random. The method of expressing the polarization of the I / Q component is generally to take its average value. Now the polarization coefficient of single-mode fiber is in the order of magnitude of We can calculate the polarization state value through polarization description, and the polarization description formula is as follows: Where A i represents the group delay between two polarization states,

[0045]

[0046] is the phase shift of the optical signal in the x direction during transmission. Q is the phase shift of the optical signal in the y direction during transmission. θ Represents the rotation between two polarization states. This calculation solves the asymmetry of the optical fiber structure and the medium, and the difference in propagation constants in the two polarization directions caused by different refractive indices in different directions, so that the I / Q components are polarized balanced, ensuring the delay performance, thereby ensuring the system capacity and transmission distance.

[0047] In this embodiment, the carrier frequency deviation detection module is used to solve the signal distortion caused by the unstable signal due to multipath propagation during the transmission process, control the data bit error rate, and ensure the signal reception performance;

[0048] The signal judgment module judges the optical signal after multiple processing to confirm the transmission performance of the optical signal.

[0049] In this embodiment, the output end of the input module is connected to the input end of the light source signal compensation module, the output end of the light source signal compensation module is connected to the input end of the dispersion compensation module, the output end of the dispersion compensation module is connected to the input end of the polarization equalization module, the output end of the polarization equalization module is connected to the input end of the carrier frequency deviation detection module, the output end of the carrier frequency deviation detection module is connected to the input end of the signal judgment module, and the output end of the signal judgment module is connected to the input end of the output module.

[0050] Embodiment 2:

[0051] See also Figure 1-3 , an optical communication system is applied in an optical communication module, having an outer shape formed based on standard specifications, capable of communicating with a circuit substrate on a host side equipped with the optical communication module via a predetermined communication interface, inputting a light source signal to the circuit substrate through an optical transmitting unit, coupling a plurality of light source signals of different wavelengths into the same optical fiber, and attaching them to an optical carrier for transmission, dividing the light source signal into I / Q components through a modulator inside, and attaching the I / Q components to an optical carrier, transmitting the light source signal through the optical fiber, and an optical receiving unit for receiving the light source signal and converting it into an electrical signal.

[0052] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0053] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An optical communication system, characterized in that: It includes a light transmitting unit, a wavelength division multiplexing unit, a light source modulation unit, a fiber amplification unit, a wavelength division multiplexing unit, a light source detection unit, a light source demodulation unit, a light receiving unit and a light source signal processing unit; The optical transmission unit includes a plurality of light source transmission signals of different wavelengths, and is used to receive a plurality of electrical signals, and convert the light source transmission signals into light source signals, and inject them into the optical fiber for transmission; The wavelength division multiplexing unit is used to couple several light source signals of different wavelengths into the same optical fiber and attach them to the optical carrier for transmission; The light source modulation unit is provided with a modulator outside the light source, and an electrical digital signal is applied to the modulator as a modulation signal, so that after the light source signal from the optical carrier passes through the modulator, the parameters of the output light source signal are changed into I / Q components along with the modulation signal; The optical fiber amplifier unit performs full optical amplification on the light source signal processed by the light source modulation unit, by applying the energy of the pump light to the light source signal to amplify the energy of the light source signal; The wavelength division and demultiplexing unit is used to decompose the optical source signal coupled into the same optical fiber and attached to the optical carrier for transmission into the original individual optical source signals; The light source detection unit is used to detect the light source signal power incident on its surface and record the light source signal power; The light source demodulation unit is used to match the light source signal detected in the light source detection unit with its used power, and combine the matched I / Q components into the light source signal; The light receiving unit includes a plurality of light source receiving signals, which are used to receive a plurality of light source signals of different wavelengths and convert the light source signal output into an electrical signal; The light source signal processing unit is used to process the damage suffered by the light source signal in the transmission optical fiber link, including signal attenuation, dispersion reduction, I / Q component imbalance, and frequency deviation caused by the difference between the local oscillator light and the optical carrier frequency; The output end of the optical transmission unit is connected to the input end of the wavelength division multiplexing unit, the output end of the wavelength division multiplexing unit is connected to the input end of the light source modulation unit, the output end of the light source modulation unit is connected to the input end of the optical fiber amplification unit, the output end of the optical fiber amplification unit is connected to the input end of the wavelength division multiplexing unit, the optical fiber amplification unit and the optical signal processing unit are connected to each other, the output end of the wavelength division multiplexing unit is connected to the input end of the light source detection unit, the output end of the light source detection unit is connected to the input end of the light source demodulation unit and the optical signal processing unit, and the output end of the light source demodulation unit is connected to the input end of the light receiving unit; The optical signal processing unit includes an input module, a light source signal compensation module, a dispersion compensation module, a polarization equalization module, a carrier frequency deviation detection module, a signal decision module and an output module, wherein the light source signal compensation module is used to supplement the light signal intensity in the optical fiber transmission length; The output end of the input module is connected to the input end of the light source signal compensation module, the output end of the light source signal compensation module is connected to the input end of the dispersion compensation module, the output end of the dispersion compensation module is connected to the input end of the polarization equalization module, the output end of the polarization equalization module is connected to the input end of the carrier frequency deviation detection module, the output end of the carrier frequency deviation detection module is connected to the input end of the signal decision module, and the output end of the signal decision module is connected to the input end of the output module; The carrier frequency deviation detection module is used to solve the signal distortion caused by signal instability due to multipath propagation during the transmission process and control the data bit error rate; The signal judgment module judges the optical signal after multiple processing to confirm the transmission performance of the optical signal; The dispersion compensation module is used to deal with the dispersion increase problem caused by the optical fiber transmission length during the transmission of the light source signal, so as to offset the dispersion by emitting zero dispersion wavelength; The polarization equalization module is used to solve the problem of differences in polarization propagation constants of I / Q components caused by external bending factors during the transmission of I / Q components in optical fiber communication lines; Between fiber segments, there will be a propagation constant difference between the two polarization states, and its value is random. The polarization coefficient of a single-mode fiber is on the order of , the polarization state value is calculated through polarization description, and the polarization description formula is as follows: , where A i represents the group delay between two polarization states, , , is the phase shift of the optical signal in the x direction during transmission. Q is the phase shift of the optical signal in the y direction during transmission. θ represents the rotation between two polarization states.

2. An optical communication module of an optical communication system according to any one of claims 1, characterized in that: The optical communication module has an outer shape formed based on standard specifications, and communicates with a circuit substrate on the host side on which the optical communication module is installed via a predetermined communication interface. It is characterized in that a light source signal is input to the circuit substrate through an optical transmitting unit, and several light source signals of different wavelengths are coupled to the same optical fiber, and attached to an optical carrier for transmission. The light source signal is divided into I / Q components through a modulator, and the I / Q components are attached to an optical carrier, and the light source signal is transmitted through the optical fiber. The light receiving unit is used to receive the light source signal and convert it into an electrical signal.

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