Control method and apparatus for channel power slope, and communication device and storage medium

Abstract

The present application belongs to the technical field of optical communications. Disclosed are a control method and apparatus for a channel power slope, and a communication device and a storage medium. The control method for a channel power slope comprises: acquiring a real-time channel optical power spectrum of a line-side amplifier in an optical transmission system; and according to the real-time channel optical power spectrum, controlling the line-side amplifier to adjust a channel power slope.

Description

Channel power slope control method, device, communication equipment and storage medium

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202310909457.3 filed on July 21, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of optical communication technology, and in particular to a method and apparatus for controlling a channel power slope, a communication device, and a computer storage medium. Background Art

[0004] In existing WDM (Wavelength Division Multiplexing) systems, when transmitting optical signals on the line side, the SRS (Stimulated Raman Scattering) effect in the line fiber that transmits the optical signals will become increasingly severe as the optical signal transmission spans accumulate, causing the entire WDM system to malfunction.

[0005] Related technologies address the SRS effect in WDM systems by presetting the gain spectrum of optical amplifiers to a negative gain slope or deploying DGE (Dynamic Gain Equalization) sites after multiple transmission spans for centralized dynamic compensation. However, these approaches still present bottlenecks in addressing the power unevenness caused by the SRS effect in WDM systems.

[0006] Summary of the Invention

[0007] The main purpose of this application is to provide a channel power slope control method, device, communication equipment and computer storage medium, aiming to realize automatic control of channel power slope at OLA (Optical Line Amplifier) ​​site in optical transmission system, so as to efficiently deal with the power unevenness problem caused by SRS effect in the system.

[0008] To achieve the above objectives, an embodiment of the present application provides a method for controlling a channel power slope, the method comprising:

[0009] Obtaining the real-time channel optical power spectrum of the line-side amplifier in the optical transmission system;

[0010] The line-side amplifier is controlled to adjust the channel power slope according to the real-time channel optical power spectrum.

[0011] In addition, to achieve the above-mentioned purpose, an embodiment of the present application further provides a channel power slope control device, the channel power slope control device comprising:

[0012] an optical top-modulation signal processing unit configured to obtain a real-time channel optical power spectrum of a line-side amplifier in an optical transmission system;

[0013] The EDFA gain control unit is configured to control the line-side amplifier to adjust the channel power slope according to the real-time channel optical power spectrum.

[0014] Each functional module of the channel power slope control device implements the steps of the channel power slope control method described above during operation.

[0015] In addition, an embodiment of the present application also provides a communication device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the channel power slope control method as described above.

[0016] In addition, an embodiment of the present application further provides a computer storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the channel power slope control method described above are implemented.

[0017] Embodiments of the present application disclose a method, apparatus, communication device, and computer storage medium for controlling a channel power slope. The control method includes: obtaining a real-time channel optical power spectrum of a line-side amplifier in an optical transmission system; and controlling the line-side amplifier to adjust the channel power slope based on the real-time channel optical power spectrum. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a schematic diagram of the structure of the operating equipment of the hardware operating environment involved in the embodiment of the present application;

[0019] FIG2 is a schematic diagram of the networking of the WDM system involved in the embodiment of the present application;

[0020] FIG3 is a schematic diagram of a flow chart of steps of an embodiment of a method for controlling a channel power slope according to an embodiment of the present application;

[0021] FIG4 is a schematic diagram of the functional module architecture involved in an embodiment of a device for controlling a channel power slope according to an embodiment of the present application;

[0022] FIG5 is a schematic diagram of an application flow involved in an embodiment of a method for controlling a channel power slope according to an embodiment of the present application;

[0023] FIG6 is a schematic diagram of the functional module architecture involved in another embodiment of the channel power slope control device provided in the embodiment of the present application.

[0024] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] Refer to Figure 1, which is a schematic diagram of the operating equipment structure of the hardware operating environment involved in the embodiment of the present application.

[0027] In this embodiment, the operating device of the hardware operating environment involved in the embodiment of the present application can be a communication device including a channel power slope control device, and the communication device can be an OTN network device or any other commercial line-side EDFA module, such as a bidirectionally pumped dual-pump EDFA, etc.

[0028] As shown in Figure 1, the operating device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may include a standard wired interface and a wireless interface (such as a wireless fidelity (WI-FI) interface). The memory 1005 may be a high-speed random access memory (RAM) or a stable non-volatile memory (NVM), such as a disk storage. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0029] Those skilled in the art will understand that the structure shown in FIG1 does not constitute a limitation on the operating device, and may include more or fewer components than shown, or a combination of certain components, or a different arrangement of components.

[0030] As shown in FIG. 1 , the memory 1005 as a storage medium may include an operating system, a data storage module, a network communication module, a user interface module, and a computer program.

[0031] In the operating device shown in FIG1 , the network interface 1004 is mainly used for data communication with other devices; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the operating device of the present application can be set in the operating device, and the operating device calls the computer program stored in the memory 1005 through the processor 1001 and performs the following operations:

[0032] Obtaining the real-time channel optical power spectrum of the line-side amplifier in the optical transmission system;

[0033] The line-side amplifier is controlled to adjust the channel power slope according to the real-time channel optical power spectrum.

[0034] Exemplarily, the processor 1001 may call a computer program stored in the memory 1005 and further perform the following operations:

[0035] Acquiring a modulated optical signal to be measured in the optical transmission system;

[0036] The peak-adjusted optical signal to be measured is processed to obtain a real-time channel optical power spectrum of the line-side amplifier.

[0037] Exemplarily, the processor 1001 may call a computer program stored in the memory 1005 and further perform the following operations:

[0038] Performing noise amplification and digital-to-analog conversion on the photocurrent signal corresponding to the peak-adjusted light signal to be measured to obtain a digital signal;

[0039] Performing digital signal processing on the digital signal by a preset logic unit to obtain a processed signal;

[0040] The intensity of each frequency component of the modulated optical signal to be measured and the modulation digital information are determined according to the processed signal to generate a real-time channel optical power spectrum of the line-side amplifier.

[0041] Exemplarily, the processor 1001 may call a computer program stored in the memory 1005 and further perform the following operations:

[0042] Determining a channel power slope deviation according to the real-time channel optical power spectrum;

[0043] The line-side amplifier is controlled to iteratively adjust the channel power slope according to the channel power slope deviation until the adjusted channel power slope meets a preset condition.

[0044] Exemplarily, the processor 1001 may call a computer program stored in the memory 1005 and further perform the following operations:

[0045] When the adjusted channel level power slope changes to a preset expected channel power slope, it is determined that the adjusted channel level power slope meets the preset condition.

[0046] Exemplarily, the processor 1001 may call a computer program stored in the memory 1005 and further perform the following operations:

[0047] The line side amplifier is controlled to perform an automatic gain control operation so that the average gain of the line side amplifier is kept constant.

[0048] Exemplarily, the processor 1001 may call a computer program stored in the memory 1005 and further perform the following operations:

[0049] While controlling the line-side amplifier to perform channel power slope adjustment according to the real-time channel optical power spectrum, the line-side amplifier is controlled to perform automatic gain control operations so that the average gain of the line-side amplifier is in a constant state during the channel power slope adjustment process.

[0050] Based on the operating device structure of the hardware operating environment involved in the above-mentioned embodiment of the present application, the overall concept of the channel power slope control method provided by the embodiment of the present application is first proposed.

[0051] As the single-wavelength rate of optical fiber communication systems gradually enters the 400G era, the PM-QPSK modulation code type is required in inter-provincial backbone ultra-long-haul transmission scenarios to improve the transmission capacity of the entire optical network. Because the 400G PM-QPSK modulation code type requires support for a single-wavelength 130G+ baud rate, the corresponding single-wavelength spectrum interval needs to be widened to 150GHz. At the same time, to meet the current typical number of service wavelengths (80 wavelengths), the entire optical spectrum needs to be expanded from the current C-band to the C6T+L6T band. As the total transmission band expands, the SRS stimulated Raman scattering effect in line fiber transmission will also be significantly enhanced, resulting in increasingly severe changes in channel optical power, OSNR (Optical Signal to Noise Ratio), and nonlinearity. As shown in Figure 2, in the line-side transmission of a typical WDM system network, the SRS effect becomes increasingly severe as the transmission spans accumulate. That is, the power difference between channels increases with the increase in transmission spans. When it reaches the receiving end, the high-power channel may cause the receiver power to overload, while the low-power channel is lower than the receiver sensitivity, causing the entire WDM system to malfunction.

[0052] Nowadays, in order to deal with the power unevenness caused by the SRS effect, which is caused by the transfer of channel optical power from short wavelength to long wavelength, the following two measures are mainly taken in WDM systems, namely:

[0053] 1. The gain spectrum of the optical amplifier board is pre-set to a negative gain slope (i.e., short-wavelength gain is greater than long-wavelength gain) to compensate for channel power transfer caused by the SRS effect. Manual adjustment is required when conditions change.

[0054] 2. The optical system line side is equipped with a DGE dynamic gain equalization station after multiple transmission spans to centrally and dynamically compensate for the inconsistency of optical fiber loss, EDFA gain, and other optical components' response to wavelength caused by different service configurations or device aging.

[0055] The above two measures demonstrate that current optical systems face the following bottlenecks in handling the power unevenness problem caused by SRS: First, a large number of OLA sites in existing WDM systems lack the ability to detect channel power and unevenness. Only sites equipped with OPMs (Optical Performance Monitors) after multiple spans have this capability. Consequently, OLA sites are unable to respond to changes in channel power in real time. Second, online adjustment of channel power slope is currently only supported at DGE sites. This adjustment method is lumped and subject to time lags. In particular, adjusting the channel power slope after multiple spans of accumulation requires a high dynamic range for DGE power adjustment, making it impossible to control excessively large channel power variations.

[0056] In response to the above problems, an embodiment of the present application discloses a method for controlling the channel power slope, which monitors the optical performance of a line-side amplifier in an optical transmission system to obtain the real-time channel optical power spectrum of the line-side amplifier, and then controls the line-side amplifier according to the real-time channel optical power spectrum to adjust the channel power slope.

[0057] In this way, compared with the traditional configuration of dynamic gain equalization sites to centrally adjust the channel power slope of line-side amplifiers for multiple spans in the system, the channel power slope control method provided in the embodiment of the present application can achieve the automatic adjustment function of the channel power slope in line-side amplifiers such as OLA sites through simple logical changes without adding additional hardware costs, thereby enabling the optical transmission network to have fast, real-time response and distributed channel power slope automatic control capabilities, thereby efficiently handling the power unevenness problem caused by the SRS effect in the system.

[0058] In addition, the embodiment of the present application can greatly alleviate the channel power slope adjustment range requirements of the dynamic gain equalization site and the difficulty of OTN operation and maintenance by automatically adjusting the channel power slope in the line-side amplifier.

[0059] Based on the overall concept of the channel power slope control method provided by the above-mentioned embodiment of the present application, various embodiments of the channel power slope control method of the present application are proposed.

[0060] The channel power slope control method of the present application is applied to the above-mentioned operating equipment, which can be a communication device including a channel power slope control device. Based on the different design requirements of actual applications, in different feasible embodiments, the channel power slope control method of the present application can of course also be applied to other terminal devices. In order to facilitate understanding and explanation of the technical solution, the channel power slope control device (hereinafter referred to as the automatic control device) is used as the execution body of the solution to explain the channel power slope control method of the present application.

[0061] Please refer to Figure 3, which is a schematic flow chart of the steps of the first embodiment of the channel power slope control method of the present application. Although the flow chart shows a logical order, in some cases, the channel power slope control method of the present application can also perform the steps in a different order than shown or described here.

[0062] As shown in FIG3 , in a first embodiment of the method for controlling the channel power slope of the present application, the method for controlling the channel power slope provided by the present application may include the following steps:

[0063] Step S10, obtaining a real-time channel optical power spectrum of a line-side amplifier in an optical transmission system;

[0064] In this embodiment, the automatic control device continuously monitors the optical performance of a line-side amplifier in the optical transmission system during the optical signal transmission process of the optical transmission system, thereby obtaining a real-time channel optical power spectrum of the line-side amplifier.

[0065] In this embodiment and other feasible embodiments, the logic control core of the automatic control device (i.e., the control device for the channel power slope) includes an optical top-modulated signal processing unit and an EDFA gain control unit. As shown in FIG4 , the automatic control device also includes other functional units such as a photoelectric conversion unit, an optical top-modulated signal amplification circuit, a pump drive unit, a slope adjustment unit, and an EDFA module. Among them, the pump drive unit is used to convert the control signal output by the EDFA gain control unit into an actual pump drive current, and then send the pump drive current to the pump laser in the EDFA module to generate the 98 required for a specific gain. The EDFA module is a device that receives pump light of a wavelength of 0nm or 1480nm. The slope adjustment unit converts the control signal output by the EDFA gain control unit into a voltage control signal for the electrically variable optical attenuator (EVOA), which is used to adjust the channel power slope of the EDFA output spectrum. The EDFA module amplifies the input signal light at the desired gain to obtain output signal light with a specific channel power and a specific channel power slope. In one embodiment, the EDFA module generally includes an indefinite number and length of erbium-doped optical fibers, an indefinite number of pump lasers, a coupler, an isolator, a gain-flattening filter, an electrically variable optical attenuator (EVOA), and other components.

[0066] Based on different design requirements of actual applications, in different feasible implementations, the automatic control device may of course include other functional units in addition to the functional units listed here, or the total number of functional units it includes may be less than the functional units listed here. Moreover, in different feasible implementations, the connection between the functional units in the automatic control device may not be limited to the connection method shown in Figure 4. In other words, the channel power slope control method of the present application is not limited to the types and connection relationships of the functional units included in the automatic control device.

[0067] In some feasible implementations, the above-mentioned automatic control device can be integrated into any line-side amplifier of the optical transmission system, or the automatic control device can be connected to one or more line-side amplifiers in the optical transmission system at the same time, so as to realize continuous monitoring of the optical signal passing through the line-side amplifier to obtain the real-time channel power spectrum of the line-side amplifier.

[0068] In some feasible embodiments, the above step S10 may include:

[0069] Acquiring a modulated optical signal to be measured in the optical transmission system;

[0070] The peak-adjusted optical signal to be measured is processed to obtain a real-time channel optical power spectrum of the line-side amplifier.

[0071] In this embodiment, while continuously monitoring the optical performance of a line-side amplifier in an optical transmission system, the automatic control device utilizes optical top-modulation technology to obtain a top-modulated optical signal to be measured from the optical signal transmitted along the main optical path of the optical transmission system. The device then converts the top-modulated optical signal to be measured into a photocurrent signal using its integrated optoelectronic conversion unit. This photocurrent signal is then further processed using its integrated optical top-modulated signal amplification circuit and optical top-modulated signal processing unit to obtain the real-time channel optical power spectrum of the line-side amplifier in the optical transmission system.

[0072] In this and other feasible embodiments, optical top modulation technology refers to a path-based detection technology that modulates characteristic RF signals according to the service wavelength within the main optical signal and implements channel-level optical performance detection and modulated signal transmission in the downstream optical path. This technology enables channel-level power detection capabilities in optical line amplifiers (OLAs) in optical transmission systems such as WDM.

[0073] In some feasible embodiments, the above-mentioned “processing the peak-adjusted optical signal to be measured to obtain the real-time channel optical power spectrum of the line-side amplifier” may include:

[0074] Performing noise amplification and digital-to-analog conversion on the photocurrent signal corresponding to the peak-adjusted light signal to be measured to obtain a digital signal;

[0075] Performing digital signal processing on the digital signal by a preset logic unit to obtain a processed signal;

[0076] The intensity of each frequency component of the modulated optical signal to be measured and the modulation digital information are determined according to the processed signal to generate a real-time channel optical power spectrum of the line-side amplifier.

[0077] In this embodiment, after utilizing optical top-modulation technology to obtain a top-modulated optical signal to be measured from an optical signal transmitted along the main optical path of an optical transmission system, the automatic control device further performs optical-to-electrical conversion on the top-modulated optical signal to convert it into a photocurrent signal. The automatic control device then utilizes its own optical top-modulated signal amplification circuit to convert the photocurrent signal into a readily processable voltage signal. This voltage signal is then further low-noise amplified and then input into a digital-to-analog conversion chip for digital-to-analog conversion, resulting in a digital signal.

[0078] The digital signal is then input into a pre-set logic unit, including the optical top-modulated signal processing unit. The pre-set logic unit then uses the optical top-modulated signal processing unit to perform further digital signal processing on the digital signal, generating a processed signal—a time-domain voltage signal containing various carrier frequency components. Finally, the automatic control device further uses the optical top-modulated signal processing unit to perform Fast Fourier Transform (FFT) processing on the time-domain voltage signal to extract the intensity of each frequency component and demodulate the digital information modulated on each frequency component. This allows the device to detect information such as channel optical power, service rate, modulation pattern, and source / destination address, thereby generating a real-time channel optical power spectrum for the line-side amplifier.

[0079] In this embodiment and other feasible embodiments, since the automatic control device combines optical top-modulating technology to obtain a top-modulated optical signal to be measured from the optical signal transmitted by the main optical path of the optical transmission system, and then converts the top-modulated optical signal to be measured into a photocurrent signal through the optoelectronic conversion unit configured by the automatic control device, the photocurrent signal includes both the total DC optical power information and the RF top-modulating information loaded on each channel.

[0080] Furthermore, the photoelectric conversion unit configured in the automatic control device is generally a photodetector such as a PIN or APD, while the optical top-modulated signal amplification circuit configured in the automatic control device generally includes components such as a transimpedance amplifier circuit, a voltage amplifier circuit, a filter circuit, and an ADC sampling unit. Based on the different design requirements of actual applications, in different feasible implementations, the photoelectric conversion unit can of course also be other types of photodetectors, and the optical top-modulated signal amplification circuit can of course also adopt other components different from those described herein. That is, the channel power slope control method of the present application is not limited to the specific type of the photoelectric conversion unit and the specific components of the optical top-modulated signal amplification circuit described above.

[0081] Step S20: Control the line-side amplifier to adjust the channel power slope according to the real-time channel optical power spectrum.

[0082] In this embodiment, after the automatic control device continuously monitors the optical performance of the line-side amplifier in the optical transmission system to obtain the real-time channel optical power spectrum of the line-side amplifier, the automatic control device can further control the line-side amplifier to adjust the channel power slope according to the real-time channel optical power spectrum.

[0083] In this embodiment and other feasible embodiments, the automatic control device can transmit the acquired real-time channel optical power spectrum of the line-side amplifier to the EDFA gain control unit corresponding to the line-side amplifier, so that the EDFA gain control unit controls the line-side amplifier to adjust the channel power slope according to the real-time channel optical power spectrum.

[0084] In some feasible embodiments, if the automatic control device is simultaneously connected to multiple line-side amplifiers in an optical transmission system, the automatic control device can simultaneously monitor the optical performance of the multiple line-side amplifiers, thereby simultaneously analyzing and determining the real-time channel optical power spectrum of each of the multiple line-side amplifiers. The automatic control device can then transmit each real-time channel optical power spectrum to the EDFA gain control unit corresponding to each of the multiple line-side amplifiers, thereby simultaneously adjusting the channel power slope of the multiple line-side amplifiers.

[0085] In some feasible embodiments, the above step S20 may include:

[0086] Determining a channel power slope deviation according to the real-time channel optical power spectrum;

[0087] The line-side amplifier is controlled to iteratively adjust the channel power slope according to the channel power slope deviation until the adjusted channel power slope meets a preset condition.

[0088] In this embodiment, after the automatic control device generates the real-time channel optical power spectrum of the line-side amplifier by calling the optical top-modulation signal processing unit, it further transmits the real-time channel optical power spectrum to the EDFA gain control unit corresponding to the line-side amplifier. In this way, the EDFA gain control unit can calculate and determine the channel power slope deviation of the optical signal currently transmitted by the line-side amplifier based on the real-time channel optical power spectrum, and then control the line-side amplifier to iteratively adjust the channel power slope based on the channel power slope deviation until the adjusted channel power slope of the line-side amplifier meets the preset conditions.

[0089] In this embodiment and other feasible embodiments, the preset condition is that the channel power slope after adjustment by the line-side amplifier is the same as a preset expected channel power slope of the line-side amplifier.

[0090] In some feasible embodiments, the method for controlling the channel power slope of the present application may further include:

[0091] When the adjusted channel level power slope changes to a preset expected channel power slope, it is determined that the adjusted channel level power slope meets the preset condition.

[0092] In this embodiment, when the automatic control device controls the line-side amplifier to adjust the channel power slope through the EDFA gain control unit, it also continuously monitors the channel power slope of the line-side amplifier after the adjustment. Therefore, when the monitoring determines that the channel-level power slope of the line-side amplifier after the channel power slope adjustment has changed to the preset expected channel power slope of the line-side amplifier, the automatic control device determines that the channel-level power slope of the line-side amplifier after the current adjustment meets the preset conditions.

[0093] Exemplarily, after determining the real-time channel optical power spectrum of the line-side amplifier, the automatic control device further inputs the real-time channel optical power spectrum into the EDFA gain control unit. The EDFA gain control unit supports the automatic channel power slope control (ACPSC) function. Specifically, according to the application process shown in FIG5 , the EDFA gain control unit first calculates the current channel power slope value k1 by processing the real-time channel optical power spectrum input by the optical top modulation signal processing unit. This real-time slope is then compared with the expected channel power slope k0 pre-calculated based on the system configuration to calculate the current channel power slope deviation Δk of the difference signal. The EDFA gain control unit then compares the current channel power slope deviation Δk with the allowable channel power slope deviation threshold Δkth. If Δk is greater than Δkth, the slope adjustment unit is controlled to adjust the channel power slope. This iterative adjustment operation of the channel power slope is repeated, and ultimately the real-time channel power slope is gradually changed to the expected channel power slope.

[0094] In this embodiment, the channel power slope control method of the present application utilizes an automatic control device to continuously monitor the optical performance of a line-side amplifier in an optical transmission system during optical signal transmission in the optical transmission system, thereby obtaining the real-time channel optical power spectrum of the line-side amplifier. After the automatic control device continuously monitors the optical performance of the line-side amplifier in the optical transmission system to obtain the real-time channel optical power spectrum of the line-side amplifier, the automatic control device can further control the line-side amplifier to adjust the channel power slope based on the real-time channel optical power spectrum.

[0095] In this way, compared with the traditional configuration of dynamic gain equalization sites to centrally adjust the channel power slope of line-side amplifiers for multiple spans in the system, the channel power slope control method of the present application can achieve the automatic adjustment function of the channel power slope in line-side amplifiers such as OLA sites through simple logical changes without adding additional hardware costs, thereby enabling the optical transmission network to have fast, real-time response and distributed channel power slope automatic control capabilities, thereby efficiently handling the power unevenness problem caused by the SRS effect in the system.

[0096] In addition, the channel power slope control method of the present application can greatly alleviate the channel power slope adjustment range requirements of the dynamic gain equalization site and the OTN operation and maintenance difficulty by automatically adjusting the channel power slope in the line-side amplifier.

[0097] Based on the first embodiment of the method for controlling the channel power slope of the present application, a second embodiment of the method for controlling the channel power slope of the present application is proposed.

[0098] In the second embodiment of the method for controlling the channel power slope of the present application, the method for controlling the channel power slope of the present application may further include:

[0099] The line side amplifier is controlled to perform an automatic gain control operation so that the average gain of the line side amplifier is kept constant.

[0100] In this embodiment, in addition to controlling the line-side amplifier to adjust the channel power slope through the EDFA gain control unit configured by itself, the automatic control device can also control the line-side amplifier to perform automatic gain control operations, thereby keeping the average gain of the line-side amplifier in a constant state.

[0101] In some feasible embodiments, the operation of “controlling the line-side amplifier to perform automatic gain control so that the average gain of the line-side amplifier is in a constant state” may further include:

[0102] While controlling the line-side amplifier to perform channel power slope adjustment according to the real-time channel optical power spectrum, the line-side amplifier is controlled to perform automatic gain control operations so that the average gain of the line-side amplifier is in a constant state during the channel power slope adjustment process.

[0103] In this embodiment, the automatic control device can control the line-side amplifier to adjust the channel power slope based on the real-time channel optical power spectrum of the above-mentioned line-side amplifier, and at the same time control the line-side amplifier to perform automatic gain control operations. In this way, automatic gain control is performed simultaneously during the process of the line-side amplifier adjusting the channel power slope. Based on the coordination of the two, the average gain of the line-side amplifier during the process of adjusting the channel power slope is maintained in a constant state, and the average gain after the channel power slope adjustment can naturally remain unchanged.

[0104] In this embodiment and other feasible embodiments, the automatic control device can simultaneously maintain a constant average gain of the line-side amplifier through the EDFA gain control unit and the aforementioned pump driver circuit. Specifically, the EDFA gain control unit configured within the automatic control device can first implement a gain lock function, also known as an automatic gain control (AGC) mode. Specifically, when the input optical power in the main optical path of the optical transmission system varies within a certain range, the EDFA gain control unit adjusts the pump current to maintain a constant average gain, i.e., Pout / Pin is a set gain value. In one embodiment, the process of maintaining a constant average gain by adjusting the pump current is a closed-loop control process. Before, during, and after the line-side amplifier performs channel power slope adjustment, the EDFA gain control unit automatically detects the input and output optical powers using detectors at the light input and light output positions. Then, based on a table lookup and PID control, it outputs corresponding control signals to the pump driver circuit to implement the average gain lock function, thereby maintaining a constant average gain of the line-side amplifier during channel power slope adjustment.

[0105] Based on the first embodiment and / or the second embodiment of the channel power slope control method of the present application, a preferred embodiment of the channel power slope control method of the present application is proposed.

[0106] In this embodiment, the automatic control device is shown in Figure 6. The EDFA device in the figure is a bidirectionally pumped dual-pump EDFA, equipped with an EVOA between the two erbium fibers to support gain slope adjustment. Furthermore, Coupler 1, Coupler 2, PD 1, and PD 2, i.e., the corresponding amplifier circuits, are used to extract monitoring optical signals from the input and output main optical path signals according to a specific splitting ratio, enabling real-time monitoring of the input total optical power, output total optical power, and output channel power. The optical top-modulated signal amplifier circuit has a bandpass frequency response, with the passband covering the frequency range of high-carrier top-modulated optical signals. The frequency response is flat within the passband, with a typical passband range of 5-100 MHz. The amplification factor within the passband is generally 20-100 mV / μA, achieving a receiver sensitivity of -45 dBm, an overload optical power of +5 dBm, and a total dynamic range of 50 dB.

[0107] The EDFA module's automatic gain control function implements average gain control. It first calculates the drive current based on the input optical power and the set gain value using a lookup table. This drive current is then transmitted to the pump driver circuit to stimulate the pump laser to emit pump light at a specific power of 1480nm or 980nm. The signal light absorbs energy from the pump light through stimulated emission, achieving power amplification. The current lookup table is calibrated at the factory by the EDFA module. As the device state changes, the gain calculated from the lookup table may differ from the set gain. This error is compensated for by the closed-loop control of the PID module. The operating principle is to calculate the actual gain based on the current input and output optical powers. This actual gain is then entered into the PID controller and compared with the set gain. If the current gain is less than the set gain, the PID module outputs a positive integral value, increasing the drive current to increase the gain, and vice versa.

[0108] In this embodiment, the automatic control gain locking of the EDFA module is average gain locking, where the average gain is the average value of gains at different wavelengths.

[0109] Based on this, the EDFA module is used as a line-side amplifier in the optical transmission system, that is, at the OLA site. In this case, the EDFA module is pre-set to a negative gain slope (i.e., the short-wave gain is greater than the long-wave gain) to compensate for the channel power transfer caused by the SRS effect. The set gain slope corresponds to the desired output channel power slope. When the line changes, the output channel power slope can be changed by setting the gain slope. Specifically, by setting the ratio of the EVOA voltage to the drive current, the gain slope can be changed while the average gain remains unchanged. The adjustable range of the gain slope is usually -1 to -6dB within the transmission C or L band. Since the trigger conditions for this gain slope adjustment method are usually manually configured by humans or network administrators, the adjustment lacks real-time performance. Therefore, based on the above-mentioned channel power slope control method of the present application, the EDFA module uses the real-time channel optical power spectrum calculated by the optical top-modulation signal processing unit to calculate the current channel power slope value, and compares the real-time slope with the expected channel power slope calculated in advance according to the system configuration. When the difference is greater than the allowable difference threshold (generally configured to be 0.5dB), the EDFA gain control unit adjusts the gain slope according to a certain adjustment step through the gain slope adjustment unit, and at the same time obtains feedback of the real-time channel power slope through the optical top-modulation signal processing unit, so that the error between the detected real-time channel power slope and the expected channel power slope is finally less than the threshold.

[0110] In this embodiment, the optical top-modulation signal processing unit can simultaneously obtain information such as channel power, the channel bandwidth of the service wavelength, the modulation information rate, and the code type. Therefore, it can determine the channel power within the unit service bandwidth to support the automatic power slope adjustment function of the flexible grid service in the system. In one embodiment, the EDFA gain control logic unit can be implemented based on a field programmable gate array (FPGA) or an ASIC chip.

[0111] In this embodiment, the channel power slope control method of the present application is based on optical top modulation technology. Without increasing the hardware cost of the optical transmission system (the channel power slope control method of the present application and the above-mentioned automatic control device are compatible with the EDFA module of the OLA site in the optical transmission system, so that only the transmission of the optical top modulation signal in the optical network can be supported to achieve the automatic power slope adjustment function at the OLA site through simple logical changes), the optical amplifier board of the OLA site is equipped with an automatic power slope adjustment function, thereby enabling the OTN transmission network to have a fast, real-time response and distributed channel power slope automatic control capability, greatly alleviating the DGE site channel power slope adjustment range requirements and the operation and maintenance difficulty of the OTN optical network.

[0112] In addition, an embodiment of the present application further provides a device for controlling a channel power slope. The device for controlling a channel power slope of the present application is also applied to the routing device described above.

[0113] Referring to FIG. 4 , the control device for the channel power slope of the present application may include:

[0114] an optical top-modulation signal processing unit configured to obtain a real-time channel optical power spectrum of a line-side amplifier in an optical transmission system;

[0115] The EDFA gain control unit is configured to control the line-side amplifier to adjust the channel power slope according to the real-time channel optical power spectrum.

[0116] In some feasible embodiments of the device for controlling the channel power slope of the present application, the device for controlling the channel power slope of the present application may further include:

[0117] a photoelectric conversion unit configured to obtain a peak-modulated optical signal to be measured in the optical transmission system in combination with an optical peak-modulation technology;

[0118] The optical top-modulated signal processing unit of the channel power slope control device of the present application is further configured to process the top-modulated optical signal to be measured to obtain the real-time channel optical power spectrum of the line-side amplifier.

[0119] In some feasible embodiments of the device for controlling the channel power slope of the present application, the device for controlling the channel power slope of the present application may further include:

[0120] an optical top-modulated signal amplifying circuit configured to perform noise amplification and digital-to-analog conversion processing on a photocurrent signal corresponding to the top-modulated optical signal to be measured to obtain a digital signal;

[0121] The optical top-modulated signal processing unit of the channel power slope control device is further configured to perform digital signal processing on the digital signal through a preset logic unit to obtain a processed signal; and determine the intensity of each frequency component of the top-modulated optical signal to be measured and the modulation digital information based on the processed signal to generate a real-time channel optical power spectrum of the line-side amplifier.

[0122] In some feasible embodiments of the channel power slope control device of the present application, the EDFA gain control unit of the channel power slope control device of the present application is further configured to determine the channel power slope deviation based on the real-time channel optical power spectrum; and, control the line-side amplifier to iteratively adjust the channel power slope based on the channel power slope deviation until the adjusted channel power slope meets the preset conditions.

[0123] In some feasible embodiments of the channel power slope control device of the present application, the EDFA gain control unit of the channel power slope control device of the present application is also configured to determine that the adjusted channel level power slope meets the preset conditions when the adjusted channel level power slope changes to the preset expected channel power slope.

[0124] In some feasible embodiments of the channel power slope control device of the present application, the EDFA gain control unit of the channel power slope control device of the present application is also configured to control the line-side amplifier to perform automatic gain control operations so that the average gain of the line-side amplifier is in a constant state.

[0125] In some feasible embodiments of the channel power slope control device of the present application, the EDFA gain control unit of the channel power slope control device of the present application is further configured to control the line-side amplifier to perform automatic gain control while controlling the line-side amplifier to adjust the channel power slope according to the real-time channel optical power spectrum, so that the average gain of the line-side amplifier is in a constant state during the channel power slope adjustment process.

[0126] The channel power slope control device provided in the embodiments of the present application employs the channel power slope control method of the aforementioned embodiments. Compared to related technologies, the channel power slope control device provided in the embodiments of the present application achieves the same beneficial effects as the channel power slope control method provided in the aforementioned embodiments. Other technical features of the channel power slope control device are the same as those disclosed in the aforementioned embodiments and are not further detailed here.

[0127] In addition, an embodiment of the present application also provides a communication device, which includes: a control device for the channel power slope as described above, a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the computer program is configured to implement the steps of the channel power slope control method as described above.

[0128] In addition, an embodiment of the present application also provides a computer storage medium, which is a computer-readable storage medium. A computer program is stored on the storage medium, and when the computer program is executed by a processor, the steps of the channel power slope control method as described above are implemented.

[0129] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0130] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0131] The above are merely optional embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for controlling a channel power slope, wherein: The method comprises: Obtaining the real-time channel optical power spectrum of the line-side amplifier in the optical transmission system; The line side amplifier is controlled to adjust the channel power slope according to the real-time channel optical power spectrum.

2. The method for controlling the channel power slope as claimed in claim 1, wherein: Obtain the real-time channel optical power spectrum of the line-side amplifier in the optical transmission system, including: Acquire the modulated optical signal to be measured in the optical transmission system; The peak-adjusted optical signal to be measured is processed to obtain a real-time channel optical power spectrum of the line-side amplifier.

3. The method for controlling the channel power slope as claimed in claim 2, wherein: Processing the peak-adjusted optical signal to be measured to obtain a real-time channel optical power spectrum of the line-side amplifier includes: A photocurrent signal corresponding to the peak-adjusted light signal to be measured is subjected to noise amplification and digital-to-analog conversion processing to obtain a digital signal; Performing digital signal processing on the digital signal by a preset logic unit to obtain a processed signal; The intensity of each frequency component of the modulated optical signal to be measured and the modulation digital information are determined according to the processed signal to generate a real-time channel optical power spectrum of the line-side amplifier.

4. The method for controlling the channel power slope as claimed in claim 1, wherein: Controlling the line-side amplifier to adjust the channel power slope according to the real-time channel optical power spectrum includes: Determine a channel power slope deviation according to the real-time channel optical power spectrum; The line-side amplifier is controlled to iteratively adjust the channel power slope according to the channel power slope deviation until the adjusted channel power slope meets a preset condition.

5. The method for controlling the channel power slope as claimed in claim 4, wherein: The method comprises: When the adjusted channel level power slope changes to a preset expected channel power slope, it is determined that the adjusted channel level power slope meets the preset condition.

6. The method for controlling the channel power slope according to any one of claims 1 to 5, wherein: The method further comprises: The line side amplifier is controlled to perform an automatic gain control operation so that the average gain of the line side amplifier is in a constant state.

7. The method for controlling the channel power slope as claimed in claim 6, wherein: Controlling the line side amplifier to perform an automatic gain control operation so that the average gain of the line side amplifier is in a constant state, comprising: While controlling the line side amplifier to adjust the channel power slope according to the real-time channel optical power spectrum, the line side amplifier is controlled to perform automatic gain control operations so that the average gain of the line side amplifier is in a constant state during the channel power slope adjustment process.

8. A control device for channel power slope, wherein: The logic processing unit of the device comprises: An optical modulation signal processing unit configured to obtain a real-time channel optical power spectrum of a line-side amplifier in an optical transmission system; The EDFA gain control unit is configured to control the line-side amplifier to adjust the channel power slope according to the real-time channel optical power spectrum.

9. A communication device, wherein: The communication device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the channel power slope control method according to any one of claims 1 to 7.

10. A computer storage medium, wherein: The computer storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for controlling the channel power slope according to any one of claims 1 to 7 are implemented.

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