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

Abstract

The invention discloses a channel power slope control method and device, communication equipment and a storage medium, and belongs to the technical field of optical communication. The channel power slope control method comprises the following steps: acquiring 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 according to the real-time channel optical power spectrum. By adopting the technical scheme provided by the invention, the function of automatically adjusting the power slope of the channel supported by a line side amplifier such as an OLA site can be realized only through simple logic change under the condition of not additionally increasing hardware cost, so that an optical transmission network has quick and real-time response and distributed channel power slope automatic control capability; therefore, the problem of uneven power caused by the SRS effect in the system is efficiently solved.

Description

Technical Field

[0001] The present application relates to the field of optical communication technology, and in particular to a method and device for controlling a channel power slope, a communication device, and a computer storage medium. Background Art

[0002] In the process of transmitting optical signals on the line side of the existing WDM (Wavelength Division Multiplexing) system, the SRS (Stimulated Raman Scattering) effect in the line optical fiber transmitting the optical signal will become more and more serious with the accumulation of optical signal transmission spans, thereby causing the entire WDM system to malfunction.

[0003] In the related art, the processing of the SRS effect in the WDM system is mainly to pre-set the gain spectrum of the optical amplifier board to a negative gain slope, or to deploy DGE (Dynamic Gain Equalization) sites after multiple transmission spans for centralized dynamic compensation. However, these methods still have certain bottlenecks in dealing with the power unevenness caused by the SRS effect in the WDM system. Summary of the invention

[0004] The main purpose of the present 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 an OLA (Optical Line Amplifier) ​​site in an optical transmission system, so as to efficiently handle the power unevenness problem caused by the SRS effect in the system.

[0005] To achieve the above object, an embodiment of the present application provides a method for controlling a channel power slope, and the method for controlling a channel power slope includes:

[0006] Obtaining the real-time channel optical power spectrum of the line-side amplifier in the optical transmission system;

[0007] The line side amplifier is controlled to adjust the channel power slope according to the real-time channel optical power spectrum.

[0008] In addition, to achieve the above purpose, an embodiment of the present application further provides a channel power slope control device, the channel power slope control device comprising:

[0009] An optical modulation signal processing unit is configured to obtain a real-time channel optical power spectrum of a line-side amplifier in an optical transmission system;

[0010] 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.

[0011] Each functional module of the channel power slope control device implements the steps of the channel power slope control method described above during operation.

[0012] 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.

[0013] In addition, an embodiment of the present application further provides a computer storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the channel power slope control method as described above are implemented.

[0014] An embodiment of the present application discloses a channel power slope control method, device, communication equipment and computer storage medium. 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 according to the real-time channel optical power spectrum.

[0015] Therefore, the embodiment of the present application 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, and then controls the line-side amplifier according to the real-time channel optical power spectrum to adjust the channel power slope.

[0016] In this way, compared with the traditional configuration of dynamic gain equalization sites to centrally adjust the channel power slope of line-side amplifiers of 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.

[0017] In addition, the embodiments of the present application can also greatly alleviate the channel power slope adjustment range requirements of the dynamic gain equalization site and the difficulty of operation and maintenance of the OTN (Optical Transport Network) by automatically adjusting the channel power slope in the line-side amplifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a structural diagram of an operating device of a hardware operating environment involved in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of the networking of a WDM system involved in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of the steps of an embodiment of a method for controlling a channel power slope provided in an embodiment of the present application;

[0021] Figure 4 A schematic diagram of the functional module architecture involved in an embodiment of a channel power slope control device provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of an application flow involved in an embodiment of a method for controlling a channel power slope provided in an embodiment of the present application;

[0023] Figure 6 This 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 purpose, 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] Reference Figure 1 , Figure 1 This 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 control device for the channel power slope. Specifically, 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] like Figure 1As shown, 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 optional user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (WIreless-FIdelity, WI-FI) interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM) memory, or a stable non-volatile memory (Non-Volatile Memory, NVM), such as a disk memory. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0029] Those skilled in the art will understand that Figure 1 The structure shown in the figure does not constitute a limitation on the operating device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0030] like Figure 1 As shown, 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] exist Figure 1 In the running device shown, 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 running device of the present application can be set in the running device, and the running 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] Acquire the 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] 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;

[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] Determine 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 in a constant state.

[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 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.

[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-wave rate of optical fiber communication systems gradually enters the 400G era, in the application scenario of inter-provincial backbone ultra-long-distance transmission, the PM-QPSK modulation code type needs to be adopted to improve the transmission capacity of the entire optical network. Since the 400G PM-QPSK modulation code type requires the support of a single-wave 130G+ baud rate, the corresponding single-wave spectrum interval needs to be widened to 150GHz. At the same time, in order to meet the existing typical number of business wavelengths (80 waves), the entire optical spectrum needs to be expanded from the current C-band to the C6T+L6T band. And with the expansion of the total transmission band, the SRS stimulated Raman scattering effect in the line optical fiber transmission will also be significantly enhanced, and the resulting changes in channel optical power, OSNR (Optical Signal to Noise Ratio), and nonlinearity will also become more serious. Such as Figure 2 As shown in the figure, in the line-side transmission of a typical WDM system network, the SRS effect becomes more serious with the accumulation of transmission spans, that is, the power difference between channels increases with the increase of transmission spans, so that when it reaches the receiving end, the high-power channel may be the receiver power overload, while the low-power channel is lower than the receiver sensitivity, resulting in the entire WDM system not being able to work properly.

[0052] Nowadays, in order to deal with the uneven power caused by the transfer of channel optical power from shortwave to longwave due to the SRS effect, 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., the short-wave gain is greater than the long-wave gain) to compensate for the channel power transfer caused by the SRS effect. Manual adjustment is required after the 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 fiber loss, EDFA gain, and inconsistency in the response of other optical components to wavelengths caused by different service configurations or device aging.

[0055] From the above two measures, it can be seen that the current optical system has the following bottlenecks in dealing with the power unevenness problem caused by SRS: First, a large number of OLA sites in the existing WDM system do not have the ability to detect channel power and unevenness. Only sites equipped with OPM (Optical Performance Monitor) after multiple spans have the detection capability. Therefore, OLA sites cannot respond to changes in channel power in real time; second, the online adjustment function of channel power slope is generally only supported at DGE sites. This channel power adjustment method is lumped and has time lag. Especially when adjusting the channel power slope after multiple spans have accumulated, the dynamic range of DGE power adjustment is relatively large, and it cannot be controlled when the channel power difference is too large.

[0056] In response to the above problems, an embodiment of the present application discloses a method for controlling a channel power slope, which monitors the optical performance of a line-side amplifier in an optical transmission system to obtain a real-time channel optical power spectrum of the line-side amplifier, thereby controlling 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 of 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 also greatly alleviate the channel power slope adjustment range requirement of the dynamic gain equalization site and the difficulty of OTN operation and maintenance by automatically adjusting the channel power slope at the line side amplifier.

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

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

[0061] Please refer to Figure 3 , Figure 3 This is a schematic flow chart of the steps of the first embodiment of the channel power slope control method of the present application. It should be noted that although the logical order is shown in the flow chart, in some cases, the channel power slope control method of the present application can of course perform the steps shown or described in a different order than that here.

[0062] like Figure 3 As shown, in the 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 the line-side amplifier in the optical transmission system during the optical signal transmission process of the optical transmission system, so as to obtain the real-time channel optical power spectrum of the line-side amplifier.

[0065] It should be noted that in this embodiment and other feasible embodiments, the logic control core of the automatic control device (ie, the control device for the above-mentioned channel power slope) includes an optical top modulation signal processing unit and an EDFA gain control unit. Figure 4As shown, the automatic control device also includes other functional units such as: photoelectric conversion unit, optical modulation signal amplification circuit, pump drive unit, slope adjustment unit and 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 pump light of 980nm or 1480nm wavelength required for the specific gain; and the slope adjustment unit is used to convert the control signal output by the EDFA gain control unit into a voltage control signal of the electrically controlled variable optical attenuator (EVOA) for adjusting the channel power slope of the EDFA output spectrum; the EDFA module is used to amplify the input signal light according to the required gain to obtain the output signal light of the specific channel power and the specific channel power slope. Optionally, the EDFA module generally includes an indefinite number and length of erbium-doped optical fibers, an indefinite number of pump lasers, couplers, isolators, gain flattening filters, electrically controlled variable optical attenuators (EVOA), etc.

[0066] It should be understood that, 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 functional units it contains may be less than the functional units listed here, and in different feasible implementations, the connection of the functional units in the automatic control device may not be limited to the following. Figure 4 That is, the control method of the channel power slope of the present application is not limited to the types and connection relationships of the functional units included in the automatic control device.

[0067] Optionally, in some feasible implementations, the above-mentioned automatic control device can be integrated on 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] Optionally, in some feasible embodiments, the above step S10 may include:

[0069] Acquire the 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, the automatic control device continuously monitors the optical performance of the line-side amplifier in the optical transmission system, and obtains the optical signal to be tested that has been top-modulated from the optical signal transmitted by the main optical path of the optical transmission system in combination with the optical top-modulation technology. Then, the optical signal to be tested that has been top-modulated is first converted into a photocurrent signal by the photoelectric conversion unit configured by itself, and then the photocurrent signal is further processed based on the optical top-modulated signal amplification circuit and the optical top-modulated signal processing unit configured by itself, so as to obtain the real-time channel optical power spectrum of the line-side amplifier in the optical transmission system.

[0072] It should be noted that in this embodiment and other feasible embodiments, the optical top modulation technology refers to a path detection technology that modulates different characteristic RF signals according to the service wavelength in the main optical signal and implements channel-level optical performance detection and modulation signal transmission in the downstream optical path. Based on the optical top modulation technology, the optical line amplifier OLA site in the optical transmission system such as WDM can have the channel-level power detection capability.

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

[0074] 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;

[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 the automatic control device obtains the top-modulated optical signal to be measured from the optical signal transmitted by the main optical path of the optical transmission system in combination with the optical top-modulation technology, it further performs photoelectric conversion processing on the top-modulated optical signal to be measured through the photoelectric conversion unit configured by itself, so as to convert the top-modulated optical signal to be measured into a photocurrent signal. Then, the automatic control device calls the optical top-modulated signal amplification circuit configured by itself to convert the photocurrent signal into a voltage signal that is easy to process, and further performs low-noise amplification on the voltage signal, and then inputs the low-noise amplified voltage signal into the digital-to-analog conversion chip for digital-to-analog conversion processing, thereby obtaining a digital signal.

[0078] Then, the digital signal is input into a preset logic unit including the optical modulation signal processing unit, so that the preset logic unit uses the optical modulation signal processing unit to further process the digital signal to obtain a processed signal, which is a time-domain voltage signal containing each carrier frequency component. Finally, the automatic control device can further process the time-domain voltage signal through the optical modulation signal processing unit by FFT fast Fourier transform to extract the intensity of each frequency component, and demodulate the digital information modulated on each frequency component to detect the channel optical power, service rate and modulation code type, source address and other information, and then process and generate the real-time channel optical power spectrum of the line-side amplifier.

[0079] It should be noted that, in this embodiment and other feasible embodiments, since the automatic control device combines the optical top-modulating technology to obtain the 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 itself, the photocurrent signal includes both the total DC optical power information and the RF top-modulating information loaded on each channel.

[0080] In addition, the photoelectric conversion unit configured by the automatic control device is generally a photoelectric detector such as PIN or APD, and the optical top-modulated signal amplification circuit configured by the automatic control device generally includes a transimpedance amplifier circuit, a voltage amplifier circuit, a filter circuit, and an ADC sampling unit. It should be understood that 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 photoelectric detectors, and the optical top-modulated signal amplification circuit can of course also adopt other compositions different from those described herein. That is, the control method of the channel power slope of the present application is not limited to the specific type of the above-mentioned photoelectric conversion unit and the specific composition of the optical top-modulated signal amplification circuit.

[0081] Step S20: controlling 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] It should be noted that 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] Optionally, in some feasible embodiments, if the automatic control device is simultaneously connected to multiple line-side amplifiers in the 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 spectra of the multiple line-side amplifiers. Afterwards, the automatic control device can transmit each real-time channel optical power spectrum to the EDFA gain control unit corresponding to each of the multiple line-side amplifiers, thereby achieving simultaneous adjustment of the channel power slope of the multiple line-side amplifiers.

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

[0086] Determine 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 modulation signal processing unit, the automatic control device 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 according to the channel power slope deviation until the adjusted channel power slope of the line-side amplifier meets the preset conditions.

[0089] It should be noted that, 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 the preset expected channel power slope of the line-side amplifier.

[0090] Optionally, 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 it is determined through monitoring that the channel-level power slope of the line-side amplifier after the adjustment has changed to the expected channel power slope of the line-side amplifier that has been preset, 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 power spectrum of the line-side amplifier, the automatic control device further inputs the real-time channel power spectrum into the EDFA gain control unit, and the EDFA gain control unit supports the automatic channel power slope control function (Auto Channel Power Slope Control, ACPSC), that is, according to the following Figure 5 The application process shown in the figure first calculates the current channel power slope value k1 by processing the real-time channel optical power spectrum input by the optical modulation signal processing unit, and compares the real-time slope with the expected channel power slope k0 calculated in advance according to the system configuration, thereby calculating the current channel power slope deviation Δk of the difference signal. Then, the EDFA gain control unit compares the current channel power slope deviation Δk with the allowed channel optical rate slope deviation threshold Δkth. If Δk is greater than Δkth, the slope adjustment unit is controlled to adjust the channel power slope. The channel power slope adjustment operation is iterated repeatedly, and finally the real-time channel power slope is gradually changed to the expected channel power slope.

[0094] In this embodiment, the control method of the channel power slope of the present application continuously monitors the optical performance of the line-side amplifier in the optical transmission system during the optical signal transmission of the optical transmission system by the automatic control device, so as to obtain 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 according to 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 in 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 also greatly alleviate the channel power slope adjustment range requirements of the dynamic gain equalization site and the operation and maintenance difficulty of the OTN by automatically adjusting the channel power slope in the line side amplifier.

[0097] Furthermore, 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 in a constant state.

[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] Optionally, in some feasible embodiments, the above 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 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.

[0103] In this embodiment, the automatic control device can control the line side amplifier to adjust the channel power slope according to 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 cooperation of the two, the average gain of the line side amplifier during the channel power slope adjustment process is maintained in a constant state, and the average gain after the channel power slope adjustment can naturally remain unchanged.

[0104] It should be noted that in this embodiment and other feasible embodiments, the automatic control device can simultaneously realize the average gain of the line-side amplifier in a constant state through the EDFA gain control unit and the above-mentioned pump drive circuit. That is, the EDFA gain control unit configured by the automatic control device itself can first realize the gain locking function, also known as the automatic gain control (AGC) mode, that is, when the input optical power in the main optical path of the optical transmission system changes within a certain range, the EDFA gain control unit controls the average gain to be constant by adjusting the size of the pump current, that is, Pout / Pin is the set gain value. Optionally, the process of controlling the average gain to be constant by adjusting the size of the pump current is a closed-loop control, and the EDFA gain control unit automatically detects the size of the input optical power and the output optical power through the detectors at the light input and light output positions before, during and after the line-side amplifier performs channel power slope adjustment, and then outputs the corresponding control signal to the pump drive circuit according to the table lookup method and PID control to realize the average gain locking function to make the average gain of the line-side amplifier in the process of channel power slope adjustment in a constant state.

[0105] Furthermore, 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 as follows Figure 6As shown, the EDFA device in the figure is a dual-pump EDFA with bidirectional pumping, and an EVOA is provided between the erbium fibers at both ends to support the gain slope adjustment function. In addition, Coupler1, Coupler2, PD1, PD2 in the figure, 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 certain splitting ratio, so as to realize real-time monitoring of the input total optical power, the output total optical power, and the output channel power. Among them, the frequency response of the optical top-modulated signal amplifier circuit is bandpass, and the passband is the frequency range of the high-carrier frequency top-modulated optical signal. The frequency response in the passband is flat, and the typical value of the passband is 5-100MHz. The amplification factor in the passband is generally 20-100mV / μA, the receiving sensitivity can reach -45dBm, the overload optical power can reach +5dBm, and the dynamic range can reach 50dB in total.

[0107] The automatic gain control function of the EDFA module realizes the control of the average gain. First, the drive current is obtained according to the input light power and the set gain value lookup table, and then the drive current value is sent to the pump drive circuit to stimulate the pump laser to emit a specific power of 1480nm or 980nm wavelength pump light. The signal light absorbs energy from the pump light according to the stimulated radiation effect to achieve power amplification. The size of the current lookup table is calibrated when the EDFA module leaves the factory. When the device state changes, the gain obtained according to the lookup table may have an error with the set gain. This part of the error is compensated by the closed-loop control of the PID module. The working principle is to calculate the current actual gain size according to the current input light power and the output light power, substitute the actual gain into the PID controller and compare it with the set gain. If the current gain is less than the set gain, the PID module outputs a positive integral value to increase the drive current to increase the gain, and vice versa.

[0108] It should be noted that, in this embodiment, the automatic control gain locking of the EDFA module is average gain locking, and the average gain is the average value of the gains of 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. At this time, the EDFA module is pre-set to a negative gain slope (that is, 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. The specific method is to set the ratio of the EVOA voltage to the driving current, so that the gain slope can be changed without changing the average gain. The adjustable range of the gain slope is usually -1 to -6dB in the transmission C or L band. Since the triggering conditions of this gain slope adjustment method are usually manually configured by humans or network management, the real-time adjustment is lacking. Thus, 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 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 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] Optionally, in this embodiment, the optical modulation signal processing unit can simultaneously obtain information such as the channel power and the channel bandwidth, modulation information rate and code type of the service wavelength, so that the channel power within the unit service bandwidth can be obtained to support the automatic power slope adjustment function of the flexible grid service in the system. Optionally, the EDFA gain control logic unit can be implemented based on a field programmable gate array FPGA or ASIC chip.

[0111] In this embodiment, the control method of the channel power slope of the present application is based on the optical top modulation technology. Without increasing the hardware cost of the optical transmission system (the control method of the channel power slope 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 needs to be supported in the optical network, and the automatic power slope adjustment function can be supported 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, so that the OTN transmission network has fast and real-time response and distributed channel power slope automatic control capabilities, which greatly alleviates the channel power slope adjustment range requirements of the DGE site 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 as described above.

[0113] Please refer to Figure 4 , the control device of the channel power slope of the present application may include:

[0114] An optical modulation signal processing unit is 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] Optionally, in some feasible embodiments of the control device for the channel power slope of the present application, the control device for the channel power slope of the present application may further include:

[0117] The photoelectric conversion unit is configured to obtain the modulated optical signal to be measured in the optical transmission system in combination with the optical 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] Optionally, in some feasible embodiments of the control device for the channel power slope of the present application, the control device for the channel power slope of the present application may further include:

[0120] The optical top-modulated signal amplifying circuit is configured to perform noise amplification and digital-to-analog conversion processing on the 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 control device for applying for channel power slope is also 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 according to the processed signal to generate a real-time channel optical power spectrum of the line-side amplifier.

[0122] Optionally, 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 the channel power slope deviation according to the real-time channel optical power spectrum; and, according to the channel power slope deviation, control the line-side amplifier to iteratively adjust the channel power slope until the adjusted channel power slope meets a preset condition.

[0123] Optionally, 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 condition when the adjusted channel level power slope changes to a preset expected channel power slope.

[0124] Optionally, 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 operation so that the average gain of the line side amplifier is in a constant state.

[0125] Optionally, 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 operation 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 control device for the channel power slope provided in the embodiment of the present application adopts the control method for the channel power slope in the above embodiment. Compared with the related art, the beneficial effects of the control device for the channel power slope provided in the embodiment of the present application are the same as the beneficial effects of the control method for the channel power slope provided in the above embodiment, and other technical features in the control device for the channel power slope are the same as the features disclosed in the above embodiment method, which will not be described in detail 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 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.

[0128] In addition, an embodiment of the present application further provides a computer storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. 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 article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including 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 system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including 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 a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an 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 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 only preferred embodiments of the present application, and are not intended to 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: The logic processing unit of the device comprises: An optical modulation signal processing unit is 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, characterized in that: 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, characterized in that: 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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