Optical signal control method and device, optical transmission node and optical transmission system

Abstract

The present application discloses an optical signal control method and device, an optical transmission node and an optical transmission system, which belong to the field of optical communication. The device includes: a light source for outputting a first optical signal; an optical switch module, the optical switch module having a first input end, a second input end and an output end, the first input end being used to receive the first optical signal, the second input end being used to receive an external second optical signal, and the output end being used to output a third optical signal; a detection module being used to detect that the power change of the second optical signal in at least one wavelength channel is greater than a preset power change threshold; the optical switch module is used to adjust the on-off state of at least one wavelength channel of the received first optical signal and the second optical signal after the detection module detects that the power change of at least one wavelength channel is greater than the power change threshold, so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain a third optical signal. The present application can reduce the performance degradation of the wavelength channel.

Description

Technical Field

[0001] The present application relates to the field of optical communications, and in particular to an optical signal control method and device, an optical transmission node, and an optical transmission system. Background Art

[0002] In a wavelength division multiplexing (WDM) optical transmission system, the service information to be transmitted is modulated at different optical frequencies, that is, transmitted on different wavelength channels.

[0003] When service information is transmitted through a wavelength division multiplexed optical signal in a target band (such as a C band), since the wavelength channels in the wavelength division multiplexed optical signal affect each other, if the power of a wavelength channel of the wavelength division multiplexed optical signal varies greatly, for example, the wavelength channel is in a dropped state or added state, the optical transmission performance of the remaining wavelength channels in the optical signal except for the wavelength channel will be degraded under the effects of the optical amplifier of the optical transmission system and the stimulated Raman scattering (SRS) effect of the optical fiber. Summary of the invention

[0004] Embodiments of the present application provide an optical signal control method and device, an optical transmission node, and an optical transmission system.

[0005] In a first aspect, an optical signal control device is provided, the device comprising:

[0006] The light source is used to output a first optical signal; the first optical signal is usually an optical signal that does not carry service information and can be called a false optical signal. The light source is a wide-spectrum light source, and its wavelength covers a preset target wavelength.

[0007] The optical switch module has a first input end, a second input end and an output end, wherein the first input end is used to receive the first optical signal, the second input end is used to receive an external second optical signal, and the output end is used to output a third optical signal. The second optical signal is usually an optical signal carrying service information, which can be called a true wave signal.

[0008] The detection module is used to detect that the power change of the second optical signal in at least one wavelength channel is greater than a preset power change threshold. Wherein, the power change of the at least one wavelength channel greater than the power change threshold indicates a drop state or a gain state, the drop state is a state where the at least one wavelength channel changes from having a wave to having no wave, and the gain state is a state where the at least one wavelength channel changes from having no wave to having a wave.

[0009] The optical switch module is further used to adjust the on-off state of the at least one wavelength channel in the received first optical signal and the second optical signal after the detection module detects that the power change of the at least one wavelength channel is greater than the power change threshold, so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal.

[0010] The optical switch module of the optical signal control device provided in the embodiment of the present application adjusts the on-off state of the at least one wavelength channel in the received first optical signal and the second optical signal after the detection module detects that the power change of at least one wavelength channel of the second optical signal is greater than the power change threshold, so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal, and the third optical signal is output. When the power change of at least one wavelength channel of the second optical signal is large, it is updated to the third optical signal output, effectively reducing the degradation of the optical transmission performance of the remaining wavelength channels caused by the power change of the at least one wavelength channel.

[0011] The optical switch module can be used to realize the mutual replacement of the first wavelength channel of the first optical signal and the second optical signal, and the mutual replacement process includes: replacing the first wavelength channel of the second optical signal with the first wavelength channel of the first optical signal, or replacing the first wavelength channel of the first optical signal with the first wavelength channel of the second optical signal; the first wavelength channel of the second optical signal and the first wavelength channel of the first optical signal have the same wavelength. In this way, the wavelength channel combination of the third optical signal finally outputted relative to the second optical signal emitted by the previous transmitting end (such as the second optical signal before adding or dropping the wavelength) can be unchanged.

[0012] In an optional implementation, the wavelength channel carrying service information in the second optical signal is modulated with a pilot signal having multiple pilot frequencies, and the multiple pilot frequencies correspond to multiple wavelength channels respectively. The detection module is used to detect the pilot signal; the optical switch module is used to: after the detection module detects that at least one pilot frequency switches from a signal non-lost state to a signal lost state, determine that the wavelength channel corresponding to the at least one pilot frequency is in the wave drop state; after the detection module detects that at least one pilot frequency switches from a signal lost state to a signal non-lost state, determine that the wavelength channel corresponding to the at least one pilot frequency is in the wave add state. By detecting the pilot signal, the state of the wavelength channel can be quickly detected.

[0013] For example, the detection module can periodically detect the state of the pilot frequency point, and determine whether the pilot frequency point has a state switch based on the state of the pilot frequency point in each two adjacent detection cycles. When the state of the pilot frequency point in the current detection cycle is a signal non-lost state, and the state of the pilot frequency point in the previous detection cycle is a signal lost state, it is determined that the pilot frequency point switches from a signal non-lost state to a signal lost state; when the state of the pilot frequency point in the current detection cycle is a signal lost state, and the state of the pilot frequency point in the previous detection cycle is a signal non-lost state, it is determined that the pilot frequency point switches from a signal lost state to a signal non-lost state.

[0014] Assume that the optical signal control device is arranged between a wavelength selective switch (WSS) and an optical amplifier. The input end (i.e., the detection end) of the detection module can be connected to the output end x of the WSS, i.e., the multiplexing port of the WSS. In an optional implementation, the detection module further includes at least one other input end, which is respectively connected to at least one of the output end y of the optical signal control device and the output end z of the optical amplifier.

[0015] Among them, the output end y of the optical signal control device is the output end c of the aforementioned third optical signal. When the other input ends of the detection module are connected to the output end y, the detection module can also detect the relationship between the optical signals obtained from the aforementioned output ends x and output end y, and determine whether the optical switch module fails based on the relationship of the optical signals. When it is determined that the optical signal control device fails, an alarm message indicating that the optical signal control device fails is issued.

[0016] When the other input ends of the detection module are respectively connected to the output end y and the output end z, the detection module can also detect the relationship between the optical signals obtained from the aforementioned output end y and output end z, and determine whether the optical amplifier has a fault based on the relationship of the optical signals. When it is determined that the optical amplifier has a fault, an alarm message indicating that the optical amplifier has a fault is issued.

[0017] When the other input terminals of the detection module are connected to the output terminal z, the detection module can also detect the relationship between the optical signals obtained from the aforementioned output terminals x and z, and determine whether the optical amplifier has a fault based on the relationship between the optical signals. When it is determined that the optical amplifier has a fault, an alarm message indicating that the optical amplifier has a fault is issued.

[0018] By detecting the aforementioned output end y and / or output end z, the function of the optical transmission node can be calibrated in time to avoid service interruption or transmission error caused by failure of optical devices in the optical transmission node.

[0019] In an optional implementation, the optical switch module is used to: after determining that the first wavelength channel of the second optical signal is in the wavelength drop state, control the first wavelength channel of the first optical signal received by the first input end to be turned on, and control the first wavelength channel of the second optical signal received by the second input end to be turned off; or, after determining that the first wavelength channel of the second optical signal is in the wavelength add state, control the first wavelength channel of the first optical signal received by the first input end to be turned off, and control the first wavelength channel of the second optical signal received by the second input end to be turned on, and the first wavelength channel of the first optical signal and the first wavelength channel of the second optical signal have the same wavelength.

[0020] For example, the optical switch module is used to: perform a first filtering process on the first wavelength channel to make the first wavelength channel turned on, and the wavelength of the turned-on first wavelength channel is within the bandpass filtering range; perform a second filtering process on the first wavelength channel to make the first wavelength channel turned off, and the wavelength of the turned-off first wavelength channel is within the bandstop filtering range.

[0021] The first filtering process and the second filtering process are opposite filtering processes, which can be implemented in a variety of ways. The present application embodiment takes the following two implementations as examples for illustration:

[0022] In a first implementation, the first filtering process and the second filtering process are overall filtering processes loaded on the optical signal. Assuming that the first wavelength channel is the first wavelength channel of any optical signal M of the first optical signal and the second optical signal, the process of performing the first filtering process on the first wavelength channel to make the first wavelength channel conductive includes: loading a first filtering curve for the optical signal M, the filtering characteristics of the first filtering curve at the first wavelength channel are conductive characteristics, and the filtering characteristics at other wavelength channels outside the first wavelength channel are disconnected characteristics; performing the second filtering process on the first wavelength channel to shut down the first wavelength channel includes: loading a second filtering curve for the optical signal M, the filtering characteristics of the second filtering curve at the first wavelength channel are disconnected characteristics, and the filtering characteristics at other wavelength channels outside the first wavelength channel are conductive characteristics.

[0023] Through the first implementation, the filtering curve loaded on the optical signal is only the first filtering curve or the second filtering curve, and the processing process is simple.

[0024] In the second implementation, the first filtering process and the second filtering process are partial filtering processes loaded on the optical signal. An optical signal control device, such as an optical switch module, is configured with multiple grid windows in the target band, and the multiple grid windows include grid windows corresponding to multiple specified wavelength channels of the target band. The division method of the multiple grid windows can refer to the division method of the wavelength division multiplexing system grid windows defined by the International Telecommunication Union Telecommunication Standardization Sector (ITU Telecommunication Standardization Sector, ITU-T) G.694.1 standard, that is, the center wavelength of each grid window is preset. Through the second implementation, segmented filtering of the optical signal is performed by means of grid windows, and precise filtering can be achieved.

[0025] The detection module can detect the aforementioned pilot signal in a variety of ways. For example, the optical signal control device also includes: an optical splitter, which is used to separate a fourth optical signal with a portion of the power of the second optical signal; for example, the ratio of the power of the fourth optical signal to the power of the second optical signal ranges from 1% to 10%, for example, 5%. A photoelectric converter, which is used to convert the fourth optical signal into an electrical signal and output the converted electrical signal to the detection module. For example, the photoelectric converter can be a photodiode (PhotoDiode, PD).

[0026] In the embodiment of the present application, the optical switch module 202 has two input ports and one output port, which can realize the scheduling of optical signals, and thus can be regarded as a 2×1WSS (i.e., a WSS with two input ports and one output port). The structure of the 2×1WSS can have multiple optional implementations. The embodiment of the present application takes the following two optional implementations as examples for explanation:

[0027] In a first optional implementation, the optical switch module mainly includes at least two optical filters. For example, the optical switch module includes:

[0028] A first optical filter having an input end and an output end, the input end of the first optical filter being the first input end, and the first optical filter being used to filter a received first optical signal; a second optical filter having an input end and an output end, the input end of the second optical filter being the second input end, and the second optical filter being used to filter a received second optical signal, and for wavelength channels of the same wavelength, the filtering characteristics of the first optical filter and the second optical filter are opposite; an optical combiner, the optical combiner having two input ends and one output end, the two input ends being respectively connected to the output end of the first optical filter and the output end of the second optical filter, the output end of the optical combiner being the output end of the optical switch module, and the optical combiner being used to combine the filtered first optical signal received by the two input ends and the filtered second optical signal to obtain the third optical signal.

[0029] For example, at least one of the first optical filter and the second optical filter is a wavelength blocker (WB). For example, both the first optical filter and the second optical filter are wavelength blockers. The wavelength blocker has a wavelength selection characteristic.

[0030] In an optional manner, the first optical filter and the second optical filter can be implemented using one of the following technologies: Liquid Crystal On Silicon (LCOS) technology, Digital Light Processing (DLP) technology, Planar Lightwave Circuit (PLC) technology, Liquid Crystal (LC) technology or Micro-Electro-Mechanical System (MEMS) technology.

[0031] In an embodiment of the present application, the splitting ratio of the input end of the optical combiner connected to the first optical filter is not equal to the splitting ratio of the input end of the optical combiner connected to the second optical filter. For example, the splitting ratio of the input end of the optical combiner connected to the first optical filter is less than the splitting ratio of the input end of the optical combiner connected to the second optical filter. The splitting ratio refers to the ratio of the optical signal of the branch path (i.e., one path connected by the optical combiner to the first optical filter or another path connected by the optical combiner to the second optical filter) to the optical signal of the combined path (one path output by the optical combiner).

[0032] By setting the splitting ratio of the input end connected to the optical combiner and the first optical filter to be smaller than the splitting ratio of the input end connected to the second optical filter, it can be ensured that the optical power of the first optical signal accounts for a smaller proportion in the third optical signal finally outputted, and the optical power of the second optical signal accounts for a larger proportion. This makes the insertion loss of the path from the input end connected to the first optical filter to the output end of the optical combiner smaller than the insertion loss of the path from the input end connected to the second optical filter to the output end. This reduces the insertion loss of the second optical signal actually transmitted in the optical combiner, and avoids the loss of service information.

[0033] In a second optional implementation, the optical switch module 202 mainly includes a plurality of optical switches (also called an optical switch array). For example, the optical switch module includes:

[0034] A first optical splitter having an input end and n third output ends, a second optical splitter having an input end and n fourth output ends, n optical switches and an optical combiner, wherein n is a positive integer greater than 1, each of the n optical switches has a third input end, a fourth input end and a fifth output end, and the optical combiner has n input ends and 1 output end; the input end of the first optical splitter is the first input end, the first optical splitter is used to split the received first optical signal to obtain optical signals of n wavelength channels, and input the optical signals of the n wavelength channels to the third input ends of the n optical switches through the n third output ends respectively; the input end of the second optical splitter is the second input end, the The second optical splitter is used to split the received second optical signal to obtain optical signals of n wavelength channels, and input the optical signals of the n wavelength channels to the fourth input ends of the n optical switches through the n fourth output ends respectively; the wavelengths of the optical signals received by the third input end and the fourth input end of each optical switch are the same, and each optical switch is used to select one of the optical signals received by the third input end and the optical signal received by the fourth input end to output from the fifth output end; the output end of the optical combiner is the output end of the optical switch module, the n input ends of the optical combiner are used to respectively receive the n optical signals output by the n optical switches, and the optical combiner is used to combine the n optical signals to obtain the third optical signal.

[0035] In summary, after the detection module detects that the power change of at least one wavelength channel of the second optical signal is greater than the power change threshold, the optical switch module of the optical signal control device provided in the embodiment of the present application adjusts the on-off state of at least one wavelength channel in the received first optical signal and the second optical signal, so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal, and output the third optical signal. When the power change of at least one wavelength channel of the second optical signal is large, the wavelength channel with large power change is replaced with the corresponding wavelength channel in the first optical signal, so as to obtain the third optical signal, and the power of the third optical signal is stable. In this way, the combination change of the wavelength channels in the target band can be reduced, the gain change of each wavelength channel inside the optical amplifier and the optical power change of each wavelength channel caused by SRS can be reduced, thereby reducing the degradation of the optical power and signal-to-noise ratio of the wavelength channel, reducing the bit error of the receiver, and reducing the performance impact on the optical transmission system.

[0036] Furthermore, when the third optical signal is an optical signal in a full wavelength state in the target wavelength band, the performance degradation of the remaining wavelength channels can be further reduced.

[0037] The optical signal control device provided in the embodiment of the present application is arranged outside the WSS of the optical transmission node. On the one hand, it is not necessary to occupy the additional port of the WSS device, which simplifies the structure of the WSS of the optical transmission node and reduces the manufacturing cost of the WSS. On the other hand, due to the simplification of the structure of the optical signal control device compared with the traditional WSS, it is possible to achieve rapid replacement of false optical signals and true wave signals, and the replacement speed is increased from the traditional second level to the millisecond level, thereby reducing the possible service interruption time, or compressing the service interruption time to within 50ms, and achieving an interruption delay that is not perceived by the upper-layer service.

[0038] In a second aspect, an optical transmission node is provided, the optical transmission node comprising a WSS and / or an optical amplifier, and further comprising an optical signal control device as described in any one of the first aspects.

[0039] In an optional implementation, the optical transmission node includes one or more WSSs, and an optical signal control device is disposed after at least one WSS. For example, an optical signal control device is disposed after each WSS.

[0040] Optionally, the optical transmission node comprises: one or more of the WSSs, and a first-level optical amplifier arranged after each WSS, and each optical signal control device is located between a WSS and a first-level optical amplifier;

[0041] Alternatively, the optical transmission node includes a multi-stage optical amplifier, and the optical signal control device is located between any two adjacent stages of the multi-stage optical amplifier. The optical amplifier may be an erbium doped fiber amplifier (EDFA) or a Raman amplifier.

[0042] Illustratively, the target wavelength band of the second optical signal is an S-band, a C-band or an L-band.

[0043] In summary, in the optical transmission node provided by the embodiment of the present application, after detecting that the power change of at least one wavelength channel of the second optical signal is greater than the power change threshold, the optical signal control device adjusts the on / off state of the at least one wavelength channel in the received first optical signal and the second optical signal, so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal, and output the third optical signal. When the power change of at least one wavelength channel of the second optical signal is large, it is updated to the third optical signal output, effectively reducing the degradation of the optical transmission performance of the remaining wavelength channels caused by the power change of the at least one wavelength channel.

[0044] In a third aspect, an optical transmission system is provided, which includes at least two optical transmission nodes, and the optical transmission node is any one of the optical transmission nodes in the second aspect; different optical transmission nodes correspond to different target bands.

[0045] In an optional manner, each of the optical transmission nodes includes an optical amplifier, and the optical transmission system also includes: a power detection module, used to detect power information of the at least two optical transmission nodes; and a gain control module, used to perform optical amplifier gain control of at least two target bands corresponding to the at least two optical transmission nodes based on the power information of the at least two optical transmission nodes.

[0046] The power information is an instantaneous power value, and the gain control module is used to:

[0047] Based on the instantaneous power values ​​of the at least two optical transmission nodes, the power change value of each of the at least two optical transmission nodes is calculated; based on the power change value of each of the optical transmission nodes, the optical amplifier gain control of the at least two target bands is performed.

[0048] Assume that the optical transmission system has one or more optical transmission structures, wherein the first optical transmission structure is one of the one or more optical transmission structures, and the first optical transmission structure includes Q optical transmission nodes, Q≥2, for example, 2≤Q≤3. The first optical transmission structure includes a power detection module 401 and a gain control module 402.

[0049] In the first optical transmission structure, the power detection module 401 is used to determine the instantaneous power value of the optical power of each band in the Q target bands based on the received electrical signals transmitted by the Q photoelectric converters 406, wherein the instantaneous power value of the optical power of each band in the Q target bands refers to the instantaneous power value of Q optical amplifiers belonging to different target bands and at the same level. The Q optical amplifiers are the optical amplifiers used for detection by the power detection module 401.

[0050] Accordingly, the gain control module 402 is further used to perform gain control on the optical amplifiers of the Q target bands based on the power change value of each of the Q target bands, for example, to reversely compensate for the power change caused by the stimulated Raman effect, thereby making the system performance more stable.

[0051] In a fourth aspect, a method for controlling an optical signal is provided, the method comprising:

[0052] It is detected that the power change of the second optical signal outside the optical signal control device in at least one wavelength channel is greater than a preset power change threshold; after detecting that the power change of the at least one wavelength channel is greater than the power change threshold, the on-off state of the at least one wavelength channel in the first optical signal and the second optical signal generated by the optical signal control device is adjusted so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal.

[0053] The optical signal control method provided by the embodiment of the present application, after detecting that the power change of at least one wavelength channel of the second optical signal is greater than the power change threshold, adjusts the on-off state of at least one wavelength channel in the received first optical signal and the second optical signal, so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal, and output the third optical signal. When the power change of at least one wavelength channel of the second optical signal is large (such as in the wave adding state or the wave dropping state), the wavelength channel with a large power change is replaced with the corresponding wavelength channel in the first optical signal, thereby obtaining the third optical signal, and the power of the third optical signal is stable. In this way, the combination change of the wavelength channel of the target band can be reduced, the gain change of each wavelength channel inside the optical amplifier and the optical power change of each wavelength channel caused by SRS can be reduced, thereby reducing the degradation of the optical power and signal-to-noise ratio of the wavelength channel, reducing the bit error of the receiver, and reducing the performance impact on the optical transmission system.

[0054] Furthermore, when the third optical signal is an optical signal in a full wavelength state in the target wavelength band, the performance degradation of the remaining wavelength channels can be further reduced.

[0055] In an optional manner, the power change of the at least one wavelength channel greater than the power change threshold indicates a wavelength drop state or a wavelength add state, wherein the wavelength drop state is the state in which the at least one wavelength channel changes from having a wavelength to having no wavelength, and the wavelength add state is the state in which the at least one wavelength channel changes from having no wavelength to having a wavelength.

[0056] For example, the wavelength channel carrying service information in the second optical signal is modulated with a pilot signal having multiple pilot frequencies, and the multiple pilot frequencies correspond to the multiple wavelength channels respectively. The method also includes: after detecting that at least one pilot frequency switches from a signal non-lost state to a signal lost state, determining that the wavelength channel corresponding to the at least one pilot frequency is in the wavelength drop state; after detecting that at least one pilot frequency switches from a signal lost state to a signal non-lost state, determining that the wavelength channel corresponding to the at least one pilot frequency is in the wavelength gain state.

[0057] In one example, after detecting that the power change of the at least one wavelength channel is greater than a power change threshold, adjusting the on / off state of the at least one wavelength channel in the first optical signal and the second optical signal generated by the optical signal control device so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal, including: after determining that the first wavelength channel of the second optical signal is in the wavelength drop state, controlling the first wavelength channel of the first optical signal to be turned on and controlling the first wavelength channel of the second optical signal to be turned off; or after determining that the first wavelength channel of the second optical signal is in the wavelength add state, controlling the first wavelength channel of the first optical signal to be turned off and controlling the first wavelength channel of the second optical signal to be turned on, the first wavelength channel of the first optical signal and the first wavelength channel of the second optical signal having the same wavelength.

[0058] Optionally, controlling the first wavelength channel of the first optical signal to be turned on includes: performing a first filtering process on the first wavelength channel to turn on the first wavelength channel, and the wavelength of the turned-on first wavelength channel is within a bandpass filtering range; controlling the first wavelength channel of the second optical signal to be turned off includes: performing a second filtering process on the first wavelength channel to turn off the first wavelength channel, and the wavelength of the turned-off first wavelength channel is within a bandstop filtering range.

[0059] Optionally, after detecting that the power change of the at least one wavelength channel is greater than a power change threshold, adjusting the on-off state of the at least one wavelength channel in the first optical signal and the second optical signal generated by the optical signal control device so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal, including: replacing the first wavelength channel of the second optical signal with the first wavelength channel of the first optical signal, or replacing the first wavelength channel of the first optical signal with the first wavelength channel of the second optical signal; the first wavelength channel of the second optical signal and the first wavelength channel of the first optical signal have the same wavelength, and the first wavelength channel of the second optical signal is one or more wavelength channels of at least one wavelength channel whose power change is detected to be greater than the threshold.

[0060] Optionally, the method further includes: detecting power information of at least two optical transmission nodes; and performing optical amplifier gain control of at least two target bands corresponding to the at least two optical transmission nodes based on the power information of the at least two optical transmission nodes.

[0061] For example, the process of performing optical amplifier gain control of at least two target bands corresponding to at least two optical transmission nodes based on power information of at least two optical transmission nodes includes: calculating the power change value of each optical transmission node in the at least two optical transmission nodes based on the instantaneous power values ​​of the at least two optical transmission nodes; and performing optical amplifier gain control of at least two target bands based on the power change value of each optical transmission node.

[0062] For example, it is assumed that the optical transmission system includes one or more optical transmission structures, wherein the first optical transmission structure is one of the one or more optical transmission structures, and the first optical transmission structure includes Q optical transmission nodes, Q ≥ 2, for example, 2 ≤ Q ≤ 3. For the optical transmission structure, based on the stimulated Raman effect model and the instantaneous power value of the optical power of each of the Q target bands, the power change value of each of the Q target bands is determined. Based on the determined power change value of each of the Q target bands, the optical amplifiers of the Q target bands are gain controlled respectively. For example, the power change caused by the stimulated Raman effect is reversely compensated, so that the system performance is more stable.

[0063] In a fifth aspect, a method for controlling an optical signal is provided, the method comprising:

[0064] Detect power information of at least two optical transmission nodes; and perform optical amplifier gain control of at least two target bands corresponding to the at least two optical transmission nodes based on the power information of the at least two optical transmission nodes.

[0065] Optionally, the process of performing optical amplifier gain control of at least two target bands corresponding to at least two optical transmission nodes based on power information of at least two optical transmission nodes includes:

[0066] Based on the instantaneous power values ​​of at least two optical transmission nodes, the power change value of each of the at least two optical transmission nodes is calculated; based on the power change value of each optical transmission node, optical amplifier gain control of at least two target bands is performed.

[0067] For example, it is assumed that the optical transmission system includes one or more optical transmission structures, wherein the first optical transmission structure is an optical transmission structure among the one or more optical transmission structures, and the first optical transmission structure includes Q optical transmission nodes, Q ≥ 2, for example, 2 ≤ Q ≤ 3. Based on the stimulated Raman effect model and the instantaneous power value of the optical power of each of the Q target bands, the power change value of each of the Q target bands is determined. Based on the determined power change value of each of the Q target bands, the optical amplifiers of the Q target bands are gain controlled respectively. For example, the power change caused by the stimulated Raman effect is reversely compensated, so that the system performance is more stable.

[0068] In a sixth aspect, the present application provides an optical signal control device, which may include at least one module, and the at least one module may be used to implement the optical signal control method provided by the fourth aspect or various possible implementations of the fourth aspect, and / or to implement the optical signal control method provided by the fifth aspect or various possible implementations of the fifth aspect.

[0069] In a seventh aspect, the present application provides a computer device, the computer device comprising a processor and a memory. The memory stores computer instructions; the processor executes the computer instructions stored in the memory, so that the computer device executes the optical signal control method provided by the fourth aspect or various possible implementations of the fourth aspect, and / or executes the optical signal control method provided by the fifth aspect or various possible implementations of the fifth aspect.

[0070] In an eighth aspect, the present application provides a computer-readable storage medium, in which computer instructions are stored, and the computer instructions instruct the computer device to execute the optical signal control method provided by the fourth aspect or various possible implementations of the fourth aspect, and / or execute the optical signal control method provided by the fifth aspect or various possible implementations of the fifth aspect.

[0071] In a ninth aspect, the present application provides a computer program product, the computer program product comprising computer instructions, the computer instructions being stored in a computer-readable storage medium. A processor of a computer device may read the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the optical signal control method provided in the fourth aspect or various possible implementations of the fourth aspect, and / or executes the optical signal control method provided in the fifth aspect or various possible implementations of the fifth aspect.

[0072] In a tenth aspect, a chip is provided, which may include a programmable logic circuit and / or program instructions, and when the chip is running, it is used to implement the optical signal control method provided in the fourth aspect or various possible implementations of the fourth aspect, and / or to implement the optical signal control method provided in the fifth aspect or various possible implementations of the fifth aspect.

[0073] In summary, the optical signal control device, optical transmission node and optical transmission system provided by the embodiment of the present application, after the detection module detects that the power change of at least one wavelength channel of the second optical signal is greater than the power change threshold, adjusts the on-off state of at least one wavelength channel in the received first optical signal and the second optical signal, so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal, and output the third optical signal. When the power change of at least one wavelength channel of the second optical signal is large (such as in the wave adding state or the wave dropping state), the wavelength channel with a large power change is replaced with the corresponding wavelength channel in the first optical signal, thereby obtaining the third optical signal, and the power of the third optical signal is stable. In this way, the combination change of the wavelength channels of the target band can be reduced, the gain change of each wavelength channel inside the optical amplifier and the optical power change of each wavelength channel caused by SRS can be reduced, thereby reducing the degradation of the optical power and signal-to-noise ratio of the wavelength channel, reducing the bit error of the receiver, and reducing the performance impact on the optical transmission system.

[0074] Furthermore, when the third optical signal is an optical signal in a full wavelength state in the target wavelength band, the performance degradation of the remaining wavelength channels can be further reduced.

[0075] The optical signal control device provided in the embodiment of the present application is arranged outside the WSS of the optical transmission node. On the one hand, it does not need to occupy the additional port of the WSS device, simplifies the WSS structure of the optical transmission node, and reduces the manufacturing cost of the WSS. On the other hand, due to the simplification of the structure of the optical signal control device compared with the traditional WSS, it can realize the rapid replacement of the false optical signal and the true wave signal, and the replacement speed is increased from the traditional second level to the millisecond level, thereby reducing the possible service interruption time, or compressing the service interruption time to within 50ms, and realizing the interruption delay that the upper layer service does not perceive. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] Figure 1 This is a schematic diagram of an application environment of an optical transmission system in which an optical signal control device provided in an embodiment of the present application is located;

[0077] Figure 2 This is a schematic diagram of an application environment of an optical transmission system in which another optical signal control device provided in an embodiment of the present application is located;

[0078] Figure 3A This is a schematic diagram of gain variation of a wavelength channel in an optical amplifier provided by an embodiment of the present application;

[0079] Figure 3B This is a schematic diagram of the application principle of a stimulated Raman effect in an optical transmission system provided by an embodiment of the present application;

[0080] Figure 4is a structural schematic diagram of an optical signal control device provided in an embodiment of the present application;

[0081] Figure 5 A schematic diagram of a second optical signal modulated by a transmitting end with a pilot signal having a plurality of pilot frequency points;

[0082] Figure 6 This is a schematic diagram of pilot frequency point detection provided by an embodiment of the present application;

[0083] Figure 7 is a schematic structural diagram of another schematic optical signal control device provided in an embodiment of the present application;

[0084] Figure 8 It is a structural schematic diagram of an optical transmission node where an optical signal control device provided in an embodiment of the present application is located;

[0085] Fig. 9 It is a schematic diagram of the principle of wavelength channel control provided by an embodiment of the present application;

[0086] Fig.10 is a schematic diagram of a first filtering curve and a second filtering curve provided in an embodiment of the present application;

[0087] Fig.11 is a schematic diagram of a third filtering curve and a fourth filtering curve provided in an embodiment of the present application;

[0088] Fig.12 is a schematic diagram of a third filtering curve and a fourth filtering curve provided in an embodiment of the present application;

[0089] Fig.13 is a schematic structural diagram of an optical switch module provided in an embodiment of the present application;

[0090] Fig.14 is a schematic structural diagram of an optical switch module provided in an embodiment of the present application;

[0091] Fig.15 is a structural schematic diagram of an optical transmission node provided in an embodiment of the present application;

[0092] Fig.16 is a structural schematic diagram of an optical transmission node provided in an embodiment of the present application;

[0093] Fig.17 is a schematic diagram of the structure of another optical transmission node provided in an embodiment of the present application;

[0094] Fig.18 is a structural diagram of a specific optical transmission node provided in an embodiment of the present application;

[0095] Fig.19is a structural schematic diagram of an optical transmission system provided in an embodiment of the present application;

[0096] Fig. 20 is a schematic diagram of the structure of another optical transmission system provided in an embodiment of the present application;

[0097] Fig.21 is a structural schematic diagram of another optical transmission system provided in an embodiment of the present application;

[0098] Fig. 22 is a schematic diagram of a power amplifier control structure provided in an embodiment of the present application;

[0099] Fig.23 This is a flowchart of an optical signal control method provided by an embodiment of the present application;

[0100] Fig.24 This is a flowchart of an optical signal control method provided by an embodiment of the present application;

[0101] Fig.25 It is a possible basic hardware architecture of the computer device provided in the embodiment of the present application. DETAILED DESCRIPTION

[0102] In order to make the principles and technical solutions of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0103] Optical fiber (also called line fiber) communication is a communication method that uses optical signals as information carriers and optical fibers as transmission media. It has the advantages of wide transmission bandwidth, high anti-interference and low signal attenuation. Figure 1 and Figure 2 This is a schematic diagram of the application environment of an optical transmission system (also called an optical fiber communication system) in which the optical signal control device provided in an embodiment of the present application is located. The optical transmission system is based on optical fiber communication, and includes one or more optical transmission nodes (English: Optical Transmission node), and the optical transmission node may include at least one optical device, such as an optical amplifier. Figure 1 Assume that the optical transmission system includes an optical transmission node 10, and the optical transmission node 10 includes a wavelength selective switch (Wavelength Selective Switching, WSS) 101 and an optical amplifier 102; Figure 2 Assume that the optical transmission system includes one optical transmission node 10, and the optical transmission node 10 includes two WSSs 101 and two optical amplifiers 102. The embodiment of the present application does not limit the number and type of optical devices included in the optical transmission system. Figure 1 and Figure 2The optical transmission system in the network can use wavelength division multiplexing (WDM) technology to transmit business information through optical signals, and the business information is modulated on different wavelength channels.

[0104] Since the wavelength channels in the optical signal affect each other, if the power of a wavelength channel of the wavelength division multiplexing optical signal changes greatly, for example, the wavelength channel appears to be in a drop state or an add state, the optical transmission performance of the remaining wavelength channels will be degraded due to the effects of the optical amplifier of the optical transmission system and the stimulated Raman scattering effect of the optical fiber. Figure 3A This is a schematic diagram of gain variation of a wavelength channel in an optical amplifier provided in an embodiment of the present application. Figure 3A The horizontal axis represents the wavelength channel, and the vertical axis represents the gain. Figure 3A As shown, the gains of each wavelength channel in the optical amplifier are usually coupled to each other, and the gains of different wavelength channels will be affected by the gain competition between wavelength channels. Assume that when the target band is in the full-wave state, the gain curve is curve A. Curves B, C and D are the gain curves of the remaining wavelength channels when the combination of three different wavelength channels in the target band changes (such as some wavelength channels change from a state of having waves to a state of not having waves or from a state of not having waves to a state of having waves). The target band refers to a pre-set service band, and the full-wave state refers to the power of all designated wavelength channels of the target band (these wavelength channels are used to carry service information) is greater than the preset power threshold. That is, all wavelength channels have waves, that is, there are optical signals, and the optical signals can be optical signals carrying service information or optical signals that do not carry service information. For example, the target band is the C band, and its optical wavelength range is 1530nm (nanometers) to 1565nm. There are 80 designated wavelength channels in the C band. When all 80 wavelength channels have waves, the C band is in the full-wave state. By Figure 3A It can be seen that the gain curve of the target band in the full-wave state is relatively smooth. When the power change of a certain wavelength channel is greater than the power change threshold, the gain curve changes significantly, and the gain curves of the remaining wavelength channels deviate greatly from the gain curve of the full-wave state.

[0105] Figure 3B This is a schematic diagram of the application principle of the stimulated Raman effect in an optical transmission system provided by an embodiment of the present application. The stimulated Raman effect refers to the fact that after the optical signal is transmitted through the optical fiber, the energy of the short-wavelength optical signal will be transferred to the long-wavelength optical signal, and finally a spectral distribution with a certain slope is formed in which the optical power of the short-wavelength optical signal is low and the optical power of the long-wavelength optical signal is high. When the wavelength band of the optical transmission system is the C+L band, the power transfer caused by the stimulated Raman effect is more intense.

[0106] Affected by the gain competition of each wavelength channel in the optical amplifier and the stimulated Raman effect, once the combination of wavelength channels in the target band changes, the gain and optical power of each wavelength channel inside the optical amplifier will also change dramatically. This drastic change may cause the gain and optical power of some wavelength channels to be too high or too low. After transmission through multiple optical fibers and multiple optical amplifiers, the optical power and signal-to-noise ratio of these wavelength channels will be seriously degraded, causing bit errors in the receiver, which seriously affects the performance of the optical transmission system.

[0107] For example, in an optical transmission system, the wavelength division multiplexing optical signal initially transmitted is an optical signal of 80 wavelengths in the C band, and the 80 wavelength channels are wavelength channels 1 to 80. During the transmission process, wavelength channels 1 to 40 are in a drop-out state. On the one hand, affected by the gain competition of each wavelength channel in the optical amplifier, the gain of the remaining wavelength channels 41 to 80 is no longer balanced by the previous wavelength channels 1 to 40, resulting in a significant change in the gain relative to the original C band in a full-wave state; on the other hand, affected by the stimulated Raman effect, if the C band is in a full-wave state, wavelength channels 41 to 80 will absorb energy from wavelength channels 1 to 40, but once wavelength channels 1 to 40 drop out, the remaining wavelength channels 41 to 80 cannot absorb energy from wavelength channels 1 to 40, resulting in a significant drop in optical power relative to the original C band in a full-wave state. Therefore, affected by the above two aspects, the optical transmission performance of wavelength channels 41 to 80 is significantly degraded.

[0108] An embodiment of the present application provides an optical signal control device, which can be arranged in the optical transmission system to control the on-off state of the wavelength channel to reduce the degradation of the optical transmission performance of the remaining wavelength channels caused by the change of the wavelength channel.

[0109] Figure 4 1 is a schematic diagram of the structure of an optical signal control device 20 provided in an embodiment of the present application, wherein the optical signal control device 20 is used to control different wavelength channels of a first optical signal inside the device and a second optical signal outside the device in a target wavelength band. The device 20 can be applied to Figure 1 or Figure 2 In the optical transmission system shown, the device 20 comprises:

[0110] The light source 201 is used to output a first optical signal. The first optical signal is usually an optical signal that does not carry business information and can be called a dummy light signal. The target band corresponding to the optical signal control device is pre-set. The band of the first optical signal output by the light source 201 is usually greater than or equal to the target band, that is, the light source is a wide-spectrum light source, and its band covers the target band, so that the subsequent control of each wavelength channel of the first optical signal in the target band can be guaranteed.

[0111] The optical switch module 202 has a first input terminal a, a second input terminal b and an output terminal c, wherein the first input terminal a is used to receive the first optical signal, the second input terminal b is used to receive an external second optical signal, and the output terminal c is used to output a third optical signal, for example, outputting the third optical signal to the main line of the optical link. The external second optical signal refers to an optical signal from outside the optical signal control device 20, that is, an optical signal received by the optical signal control device 20 from an optical link of the optical transmission system in which it is located, and the optical link is a link for transmitting optical signals, for example, it is an optical fiber. The second optical signal is usually an optical signal carrying business information, which can be called a true wave signal.

[0112] The detection module 203 is used to detect the presence or absence of the second optical signal, for example, to detect whether the power change of the second optical signal in at least one wavelength channel is greater than a preset power change threshold. It should be noted that when the detection module 203 detects that the power change of the second optical signal in the wavelength channel does not exist and is greater than the preset power change threshold, the next detection is performed.

[0113] Among them, the power change of at least one wavelength channel greater than the preset power change threshold indicates a drop state or a gain state, the drop state is the state of the at least one wavelength channel from having a wave (i.e., having an optical signal) to having no wave (i.e., having no optical signal), and the gain state is the state of the at least one wavelength channel from having no wave to having a wave. If the target band is the C band, there are 80 designated wavelength channels in its full wave state. If at least one wavelength channel is in the drop state, the number of designated wavelength channels with waves decreases and is less than 80. If at least one wavelength channel is in the gain state, the number of designated wavelength channels with waves increases and is less than or equal to 80.

[0114] The optical switch module 202 is used to adjust the on-off state of the at least one wavelength channel in the received first optical signal and the second optical signal after the detection module detects that the power change of the at least one wavelength channel is greater than the power change threshold, so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the aforementioned third optical signal.

[0115] The adjusting the on-off state of the at least one wavelength channel in the received first optical signal and the second optical signal refers to changing the on-off state of the at least one wavelength channel in the first optical signal and the second optical signal. For example, after the detection module 203 determines that the wavelength channel λ1 of the second optical signal changes from a state of no wave to a state of wave, the original on-off state of the wavelength channel λ1 of the first optical signal is on, then the wavelength channel λ1 of the first optical signal is adjusted to off, and the original on-off state of the wavelength channel λ1 of the second optical signal is off, then the wavelength channel λ1 of the second optical signal is adjusted to on. In this way, the wavelength channel λ1 of the output third optical signal is in a state of wave, and its optical signal is the optical signal in the wavelength channel λ1 of the second optical signal. For another example, after the detection module 203 determines that the wavelength channel λ1 of the second optical signal changes from a state with a wave to a state without a wave, if the original on-off state of the wavelength channel λ1 of the first optical signal is off, the wavelength channel λ1 of the first optical signal is adjusted to be on, and if the original on-off state of the wavelength channel λ1 of the second optical signal is on, the wavelength channel λ1 of the second optical signal is adjusted to be off. In this way, the wavelength channel λ1 of the output third optical signal is in a state with a wave, and its optical signal is the optical signal in the wavelength channel λ1 of the first optical signal. It can be seen that, due to the adjustment of the on-off state of the at least one wavelength channel in the first optical signal and the second optical signal, the power change and gain change of at least one wavelength channel of the combined third optical signal can be compensated relative to the second optical signal, thereby keeping the combination of wavelength channels in the target band unchanged or with a small change.

[0116] In summary, the optical switch module of the optical signal control device provided in the embodiment of the present application adjusts the on-off state of the at least one wavelength channel in the received first optical signal and the second optical signal after the detection module detects that the power change of at least one wavelength channel of the second optical signal is greater than the power change threshold, so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal, and the third optical signal is output. When the power change of at least one wavelength channel of the second optical signal is large (such as in the add-wave state or drop-wave state), it is updated to the third optical signal output, effectively reducing the degradation of the optical transmission performance of the remaining wavelength channels caused by the power change of the at least one wavelength channel.

[0117] In the embodiment of the present application, the detection module 203 can detect the wave drop state or the wave add state by detecting the pilot signal. In an optional example, the wavelength channel carrying the service information in the second optical signal is modulated with a pilot signal having multiple pilot frequencies. For example, when the transmitter transmits the second optical signal, on the optical signal carrying the service information (i.e., the true wave signal), a pilot signal having multiple pilot frequencies is modulated, and the multiple pilot frequencies correspond to the multiple wavelength channels respectively, for example, one-to-one correspondence with multiple designated wavelength channels of the target frequency band. Optionally, when the transmitter transmits the second optical signal, on the optical signal that does not carry the service information (i.e., the false optical signal), the pilot signal is not modulated. The frequency point refers to the absolute frequency value. It is the center frequency set in the modulation signal. In the embodiment of the present application, the multiple pilot frequencies are different from each other, for example, the multiple pilot frequencies include 1MHz or 10MHz, so that the detection module 203 can realize the effective identification of the pilot frequency points.

[0118] Figure 5 It is a schematic diagram of a second optical signal modulated by a transmitting end with a pilot signal having multiple pilot frequencies. For example, assuming that each wavelength channel of the second optical signal carries service information, that is, a true wave signal, the pilot signal can be a low-frequency pilot signal, and its frequency is less than a preset frequency threshold, and the frequency threshold can be 10MHz. By modulating the low-frequency pilot signal when sending the second optical signal, the top of the second optical signal can be adjusted. The top of the optical wave corresponding to the second optical signal before modulation is flush, that is, the height of the wave crest is the same, and the top of the optical wave corresponding to the second optical signal after modulation is no longer flush, that is, a fluctuation is formed.

[0119] The detection module 203 is used to detect the pilot signal. For example, the detection module 203 may be a detection circuit.

[0120] The optical switch module 202 is used to: after the detection module 203 detects that at least one pilot frequency point switches from a signal non-lost state (i.e., there is a signal) to a signal loss (i.e., no signal) state, determine that the wavelength channel corresponding to the at least one pilot frequency point is in a wave drop state; after the detection module 203 detects that at least one pilot frequency point switches from a signal loss state to a signal non-lost state, determine that the wavelength channel corresponding to the at least one pilot frequency point is in a wave add state. For example, the detection module 203 can periodically detect the state of the pilot frequency point, and determine whether the state of the pilot frequency point switches based on the state of the pilot frequency point in each two adjacent detection cycles. When the state of the pilot frequency point in the current detection cycle is a signal non-lost state, and the state of the pilot frequency point in the previous detection cycle is a signal loss state, determine that the pilot frequency point switches from a signal non-lost state to a signal loss state; when the state of the pilot frequency point in the current detection cycle is a signal loss state, and the state of the pilot frequency point in the previous detection cycle is a signal non-lost state, determine that the pilot frequency point switches from a signal loss state to a signal non-lost state. In actual implementation, when the state of the pilot frequency point in the current detection cycle is the signal loss state, it is also possible to directly determine whether the pilot frequency point is switched from the signal loss state to the signal loss state without detecting whether the state of the pilot frequency point in the previous detection cycle is the signal loss state.

[0121] Figure 6 This is a schematic diagram of pilot frequency detection provided in an embodiment of the present application. Figure 6 In the figure, the horizontal axis represents frequency and the vertical axis represents power. 1 to 13 are the numbers of the corresponding pilot frequencies and do not represent the frequency size. Figure 6 The solid arrow with a circle in the middle indicates that the pilot frequency point switches from the signal loss state to the signal non-loss state, the dashed arrow with a cross indicates that the pilot frequency point switches from the signal non-loss state to the signal loss state, and the other solid arrows indicate that the pilot frequency point does not switch state. Figure 6 It can be seen that the pilot frequencies numbered 6, 8, 9, 11, 12, and 13 switch from the signal non-loss state to the signal loss state, which means that the wavelength channels corresponding to the pilot frequencies numbered 6, 8, 9, 11, 12, and 13 are in the wave drop state. The pilot frequencies numbered 4 and 5 switch from the signal loss state to the signal non-loss state, which means that the wavelength channels corresponding to the pilot frequencies numbered 4 and 5 are in the wave add state.

[0122] It is worth noting that, since the wavelength channel carrying service information in the second optical signal received by the optical signal control device 20 has been modulated with a pilot signal having multiple pilot frequencies, in an optional implementation, the wavelength channel carrying service information in the output third optical signal by the optical signal control device 20 is still modulated with the pilot signal. Assuming that a certain wavelength channel λ2 of the third optical signal does not carry service information and is a false optical signal, the certain wavelength channel λ2 does not modulate the pilot signal, and the optical signal control device 20 will not modulate the pilot signal for the certain wavelength channel λ2. The pilot frequency corresponding to the certain wavelength channel λ2 is detected as a signal loss state in the subsequent detection process.

[0123] In the embodiment of the present application, the detection module 203 can detect the pilot signal in multiple ways. Figure 7 2 is a schematic diagram of another schematic structure of an optical signal control device 20 provided in an embodiment of the present application. Figure 7 As shown, the optical signal control device 20 further includes: an optical splitter 204 and a photoelectric converter 205 .

[0124] The optical splitter 204 is used to separate a part of the power of the second optical signal into a fourth optical signal. The optical splitter 204 can be set on an optical link for transmitting the second optical signal. It has an input end and two output ends. The optical splitter 204 divides the second optical signal input at the input end into two paths, namely the fourth optical signal and the new second optical signal. The power of the new second optical signal is reduced relative to the power of the second optical signal input to the optical splitter, but the business information carried is not reduced. The process realizes the use of the separated part of the second optical signal for pilot signal detection. For example, the ratio of the power of the fourth optical signal to the power of the second optical signal ranges from 1% to 10%, for example, the ratio of the power of the fourth optical signal to the power of the second optical signal is 5%. In this way, it can be ensured that the branching of the optical signal has little effect on the power of the second optical signal.

[0125] The photoelectric converter 205 is used to convert the fourth optical signal into an electrical signal, and output the converted electrical signal to the detection module 203. For example, the photoelectric converter 205 can be a photodiode (PD). The photoelectric converter 205 is a conversion device that matches the pilot signal. For example, if the pilot signal is a low-frequency pilot signal, the photoelectric converter 205 is a conversion device for detecting the low-frequency pilot signal, which can convert the detected low-frequency pilot signal into an electrical signal.

[0126] Figure 8It is a structural diagram of an optical transmission node 30 in which an optical signal control device 20 is provided in an embodiment of the present application. The optical transmission node 30 includes a WSS301 and an optical amplifier 302. It is assumed that an optical signal control device 20 is arranged between the WSS301 and the optical amplifier 302. Among them, the input end (i.e., the detection end) of the detection module 203 can be connected to the output end x of the WSS301, i.e., the multiplexing port of the WSS301. In an optional implementation, the detection module 203 also includes at least one other input end, and the at least one other input end is respectively connected to the output end y of the optical signal control device 20 and at least one of the output end z of the optical amplifier 302.

[0127] Among them, the output end y of the optical signal control device 20 is the output end c of the aforementioned third optical signal. When the other input ends of the detection module 203 are connected to the output end y, the detection module 203 can also detect the relationship between the optical signals obtained from the aforementioned output ends x and output ends y, and determine whether the optical switch module has a fault based on the relationship of the optical signals. When it is determined that the optical signal control device 20 has a fault, an alarm message indicating that the optical signal control device has a fault is issued. For example, by detecting the optical signals obtained at the output ends x and output ends y, it can be known that when the power change of the second optical signal in at least one wavelength channel is greater than the preset power change threshold, the optical switch module does not adjust the optical signal, or there is a problem in the adjustment.

[0128] When the other input terminals of the detection module 203 are connected to the output terminal y and the output terminal z respectively, the detection module 203 can also detect the relationship between the optical signals obtained from the aforementioned output terminal y and the output terminal z, determine whether the optical amplifier 302 fails based on the relationship of the optical signals, and issue an alarm indicating that the optical amplifier fails when it is determined that the optical amplifier 302 fails. For example, by detecting the optical signals obtained from the output terminal y and the output terminal z, it can be known that the optical amplifier does not amplify the signal, or the signal amplification ratio is less than the preset ratio.

[0129] When the other input end of the detection module 203 is connected to the output end z, the detection module 203 can also detect the relationship between the optical signals obtained from the aforementioned output end x and the output end z, determine whether the optical amplifier 302 is faulty based on the relationship of the optical signals, and issue an alarm indicating that the optical amplifier is faulty when it is determined that the optical amplifier 302 is faulty. For example, by detecting the optical signals obtained from the output end x and the output end z, it can be known that the optical amplifier does not amplify the signal, or the signal amplification ratio is less than the preset ratio.

[0130] By detecting the output terminal y and / or the output terminal z, the function of the optical transmission node can be calibrated in time to avoid the interruption of services or transmission errors caused by the failure of the optical device in the optical transmission node. It is worth noting that the detection module 203 can also integrate other detection functions. This embodiment of the present application will not be repeated.

[0131] As mentioned above, if the power of a wavelength channel of the wavelength division multiplexing optical signal changes greatly, for example, the wavelength channel is in a dropped or added state, ensuring that the wavelength channel combination of the optical transmission system does not change can effectively ensure the stability of the performance of the remaining wavelength channels. Fig. 9 It is a schematic diagram of the principle of wavelength channel control provided in an embodiment of the present application. Fig. 9 The dashed arrows in the middle represent the wavelength channels of the second optical signal, and the solid arrows represent the wavelength channels of the first optical signal. The optical switch module 202 is used to fill the first optical signal or the second optical signal in the designated wavelength channel of the target wavelength band, thereby minimizing the wavelength channel combination of the optical transmission system from changing or changing slightly. For example, the target wavelength band meets the preset state, such as the full wavelength state. Assuming that the first wavelength channel of the second optical signal is one or more wavelength channels of at least one wavelength channel whose power change is greater than the threshold, based on Fig. 9 According to the principle, the optical switch module 202 can be used to realize the mutual replacement of the first wavelength channel of the first optical signal and the second optical signal, and the mutual replacement process includes: replacing the first wavelength channel of the second optical signal with the first wavelength channel of the first optical signal (that is, filling the first wavelength channel of the first optical signal into the first wavelength channel of the second optical signal), or replacing the first wavelength channel of the first optical signal with the first wavelength channel of the second optical signal (that is, keeping the first wavelength channel of the second optical signal conductive and blocking the first wavelength channel of the first optical signal); the first wavelength channel of the second optical signal and the first wavelength channel of the first optical signal have the same wavelength. In this way, the wavelength channel combination of the third optical signal finally outputted relative to the second optical signal before the input optical switch module 202 (such as the second optical signal before adding or dropping waves) does not change.

[0132] In the first case, the optical switch module 202 is used to: after determining that the first wavelength channel of the second optical signal is in the dropped state, control the first wavelength channel of the first optical signal received by the first input end a to be turned on, and control the first wavelength channel of the second optical signal received by the second input end b to be turned off. In actual implementation, when the optical switch module 202 determines that the first wavelength channel of the second optical signal is in the dropped state, since there is no optical signal in the first wavelength channel of the second optical signal, after controlling the first wavelength channel of the first optical signal received by the first input end a to be turned on, it is not necessary to control the on-off state of the second optical signal received by the second input end b (that is, the on-off state of the second optical signal is not controlled). For example, if the original on-off state of the first wavelength channel of the second optical signal is off, the first wavelength channel of the second optical signal is kept off, or if the original on-off state of the first wavelength channel of the second optical signal is on, the first wavelength channel of the second optical signal is kept on. In this way, the on-off state control process of the wavelength channel can be reduced, and the control complexity can be reduced.

[0133] In the second case, the optical switch module 202 is used to: after determining that the first wavelength channel of the second optical signal is in the wavelength adding state, control the first wavelength channel of the first optical signal received by the first input end a to be turned off, and control the first wavelength channel of the second optical signal received by the second input end b to be turned on. The first wavelength channel of the first optical signal and the first wavelength channel of the second optical signal have the same wavelength.

[0134] In the embodiment of the present application, the optical switch module 202 can control the on / off of the wavelength channel by filtering. For example, the optical switch module 202 is used for:

[0135] By performing a first filtering process on the first wavelength channel, the first wavelength channel is turned on, and the wavelength of the turned-on first wavelength channel is within the bandpass filtering range; by performing a second filtering process on the first wavelength channel, the first wavelength channel is turned off, and the wavelength of the turned-off first wavelength channel is within the bandstop filtering range.

[0136] The first filtering process and the second filtering process are opposite filtering processes, which can be implemented in a variety of ways. The present application embodiment takes the following two implementations as examples for illustration:

[0137] In a first implementation, the first filtering process and the second filtering process are overall filtering processes loaded on the optical signal. Assuming that the first wavelength channel is the first wavelength channel of any optical signal M of the first optical signal and the second optical signal, the process of performing the first filtering process on the first wavelength channel to make the first wavelength channel conductive includes: loading a first filtering curve for the optical signal M, the filtering characteristics of the first filtering curve at the first wavelength channel are conductive characteristics, and the filtering characteristics at other wavelength channels outside the first wavelength channel are disconnected characteristics; performing the second filtering process on the first wavelength channel to shut down the first wavelength channel includes: loading a second filtering curve for the optical signal M, the filtering characteristics of the second filtering curve at the first wavelength channel are disconnected characteristics, and the filtering characteristics at other wavelength channels outside the first wavelength channel are conductive characteristics.

[0138] Fig.10 It is a schematic diagram of the first filtering curve and the second filtering curve provided in the embodiment of the present application. Fig.10 In the figure, the horizontal axis represents wavelength, and its unit is nm (nanometer); the vertical axis represents attenuation, and its unit is dB (decibel). The on characteristic indicates that there is no attenuation, or the attenuation is less than or equal to the first preset attenuation value, for example, the first preset attenuation value is 1dB, and the off characteristic indicates that the attenuation is greater than or equal to the second preset attenuation value, for example, the second preset attenuation value is 35dB. Assuming that the wavelength of the first wavelength channel is λ, the filter curve loaded on the first wavelength channel of the first optical signal and the filter curve loaded on the first wavelength channel of the second optical signal at the same time are respectively one of the first filter curve and the first filter curve. For example, after determining that the first wavelength channel of the second optical signal is in a drop wave state, the first optical signal received by the first input end a is controlled to load the first filter curve, and the second optical signal received by the second input end b is controlled to load the second filter curve; after determining that the first wavelength channel of the second optical signal is in a gain wave state, the first optical signal received by the first input end a is controlled to load the second filter curve, and the second optical signal received by the second input end b is controlled to load the first filter curve.

[0139] In the second implementation, the first filtering process and the second filtering process are partial filtering processes loaded on the optical signal. An optical signal control device, such as an optical switch module, is configured with a plurality of grid windows in the target band, and the plurality of grid windows include grid windows corresponding to a plurality of designated wavelength channels of the target band. The division method of the plurality of grid windows can refer to the division method of the wavelength division multiplexing grid windows defined by the G.694.1 standard of the International Telecommunication Union Telecommunication Standardization Sector (ITU-T), that is, the central wavelength of each grid window is preset. For example, for a grid window with a central wavelength of 50 GHz, when filtering, only the optical signal within the range of the grid window with a central wavelength of 50 GHz is filtered.

[0140] Assuming that the first wavelength channel is the first wavelength channel of any optical signal M in the first optical signal and the second optical signal, the process of performing a first filtering process on the first wavelength channel to make the first wavelength channel conductive includes: loading a third filtering curve for the grid window corresponding to the first wavelength channel of the optical signal M, and the filtering characteristic of the third filtering curve is a conductive characteristic; performing a second filtering process on the first wavelength channel to turn off the first wavelength channel includes: loading a fourth filtering curve for the grid window corresponding to the first wavelength channel of the optical signal M, and the filtering characteristic of the fourth filtering curve is a shutoff characteristic. It is worth noting that the other wavelength channels in the second optical signal except the first wavelength channel are usually in a conductive state. In an optional manner, the other wavelength channels are not filtered; in another optional manner, the third filtering curve is loaded for the grid window corresponding to the other wavelength channels of the second optical signal, and the filtering characteristic of the third filtering curve is a conductive characteristic.

[0141] Fig.11 and Fig.12 They are schematic diagrams of the third filtering curve and the fourth filtering curve provided in the embodiments of the present application. Fig.11 and Fig.12 In the figure, the horizontal axis represents wavelength, and its unit is nm; the vertical axis represents attenuation, and its unit is dB. The on characteristic indicates no attenuation, or the attenuation is less than or equal to the first preset attenuation value, for example, the first preset attenuation value is 1dB, and the off characteristic indicates attenuation to be less than or equal to the second preset attenuation value, for example, the second preset attenuation value is 35dB. At the same time, the filtering curve of the first wavelength channel loaded on the first optical signal and the filtering curve of the first wavelength channel loaded on the second optical signal are respectively one of the third filtering curve and the fourth filtering curve. Among them, assuming that the central wavelength of the first wavelength channel is 50GHz, the third filtering curve refers to Fig.11 The fourth filter curve refers to the curve within the range of the 50GHz grid window. Fig.12 The curve within the range of the 50GHz grid window.

[0142] For example, after determining that the first wavelength channel of the second optical signal is in a wavelength drop state, the first optical signal received by the first input end a is controlled to load a third filter curve in the grid window corresponding to the first wavelength channel, and the second optical signal received by the second input end b is controlled to load a fourth filter curve in the grid window corresponding to the first wavelength channel; after determining that the first wavelength channel of the second optical signal is in a wavelength add state, the first optical signal received by the first input end a is controlled to load a fourth filter curve in the grid window corresponding to the first wavelength channel, and the second optical signal received by the second input end b is controlled to load a third filter curve in the grid window corresponding to the first wavelength channel.

[0143] In the embodiment of the present application, the optical switch module 202 has two input ports and one output port, which can realize the scheduling of optical signals, and thus can be regarded as a 2×1WSS (i.e., a WSS with two input ports and one output port). The structure of the 2×1WSS can have multiple optional implementations. The embodiment of the present application takes the following two optional implementations as examples for explanation:

[0144] In a first optional implementation manner, the optical switch module 202 mainly includes at least two optical filters. Fig.13 is a schematic structural diagram of an optical switch module 202 provided in an embodiment of the present application, such as Fig.13 As shown, the optical switch module 202 includes:

[0145] A first optical filter 2021 having an input end and an output end, wherein the input end of the first optical filter 2021 is the first input end a, and the first optical filter 2021 is used to filter the received first optical signal.

[0146] A second optical filter 2022 having an input end and an output end, the input end of the second optical filter 2022 being the second input end b, and the second optical filter 2022 being used to filter the received second optical signal. For wavelength channels of the same wavelength, the filtering characteristics of the first optical filter and the second optical filter 2022 are opposite (also called complementary). For example, for wavelength channels of the same wavelength, when the filtering characteristic of the first optical filter is turned on, the filtering characteristic of the second optical filter 2022 is turned off; when the filtering characteristic of the first optical filter is turned off, the filtering characteristic of the second optical filter 2022 is turned on.

[0147] The optical combiner 2023 has two input ends and one output end, the two input ends are respectively connected to the output end of the first optical filter 2021 and the output end of the second optical filter 2022, the output end of the optical combiner 2023 is the output end c of the optical switch module 202, and the optical combiner 2023 is used to combine the filtered first optical signal and the filtered second optical signal received by the two input ends to obtain the third optical signal. The combination refers to power combination.

[0148] For example, in a default state, the first optical filter has a shutoff characteristic (i.e., a full-off characteristic) for all wavelength channels of the received optical signal, and in a default state, the second optical filter has an open characteristic (i.e., a full-pass characteristic) for all wavelength channels of the received optical signal. In an optional example, at least one of the first optical filter and the second optical filter is a wavelength blocker (WB). For example, both the first optical filter and the second optical filter are wavelength blockers. The wavelength blocker has a wavelength selection characteristic.

[0149] In an optional manner, the first optical filter and the second optical filter can be implemented using one of the following technologies: Liquid Crystal On Silicon (LCOS) technology, Digital Light Processing (DLP) technology, Planar Lightwave Circuit (PLC) technology, Liquid Crystal (LC) technology or Micro-Electro-Mechanical System (MEMS) technology.

[0150] In an embodiment of the present application, the splitting ratio of the input end of the optical combiner connected to the first optical filter is not equal to the splitting ratio of the input end of the optical combiner connected to the second optical filter. For example, the splitting ratio of the input end of the optical combiner connected to the first optical filter is less than the splitting ratio of the input end of the optical combiner connected to the second optical filter. The splitting ratio refers to the ratio of the optical signal of the branch path (i.e., one path connected by the optical combiner to the first optical filter or another path connected by the optical combiner to the second optical filter) to the optical signal of the combined path (one path output by the optical combiner).

[0151] By setting the splitting ratio of the input end connected to the optical combiner and the first optical filter to be smaller than the splitting ratio of the input end connected to the second optical filter, it can be ensured that the optical power of the first optical signal accounts for a smaller proportion in the third optical signal finally outputted, and the optical power of the second optical signal accounts for a larger proportion. This makes the insertion loss of the path from the input end connected to the first optical filter to the output end of the optical combiner smaller than the insertion loss of the path from the input end connected to the second optical filter to the output end. This reduces the insertion loss of the second optical signal actually transmitted in the optical combiner, and avoids the loss of service information.

[0152] In a second optional implementation, the optical switch module 202 mainly includes a plurality of optical switches (also called an optical switch array). Fig.14 is a schematic structural diagram of an optical switch module 202 provided in an embodiment of the present application, such as Fig.14 As shown, the optical switch module 202 includes:

[0153] A first optical splitter 2024 having an input end and n third output ends, a second optical splitter 2025 having an input end and n fourth output ends, n optical switches 2026 and an optical combiner 2027, where n is a positive integer greater than 1, and n is usually equal to the number of designated wavelength channels in the target band. For example, if the number of designated wavelength channels is 80, then n=80. Each of the n optical switches 2026 has a third input end d, a fourth input end e and a fifth output end f, and the optical combiner 2027 has n input ends and 1 output end.

[0154] The input end of the first optical splitter 2024 is the first input end a. The first optical splitter 2024 is used to split (or branch) the received first optical signal to obtain optical signals of n wavelength channels, and input the optical signals of the n wavelength channels to the third input ends d of the n optical switches 2026 through the n third output ends respectively.

[0155] The input end of the second optical splitter 2025 is the second input end b. The second optical splitter 2025 is used to split the received second optical signal to obtain optical signals of n wavelength channels, and input the optical signals of the n wavelength channels to the fourth input ends e of the n optical switches 2026 through the n fourth output ends respectively.

[0156] Each optical switch 2026 is a 2×1 optical switch (i.e., an optical switch with two input terminals and one output terminal). The wavelength channels of the optical signals received by the third input terminal d and the fourth input terminal e of each optical switch 2026 are the same, and each optical switch 2026 is used to select one of the optical signals received by the third input terminal d and the optical signals received by the fourth input terminal e to be output from the fifth output terminal f.

[0157] The output end of the optical combiner 2027 is the output end c of the optical switch module 202, and the n input ends of the optical combiner 2027 are used to respectively receive the n optical signals output by the n optical switches 2026, and the optical combiner 2027 is used to combine the n optical signals to obtain the third optical signal. The combination refers to power combination.

[0158] It is worth noting that the aforementioned optical switch module 202 may also include other structures. For example, for the aforementioned first optional implementation, the optical switch module 202 may also include a controller, which is used to control the filtering characteristics of the two optical filters; for the aforementioned second optional implementation, the optical switch module 202 may also include a controller, which is used to control the routing of each of the aforementioned optical switches. The controller may be a central processing unit (CPU) or a peripheral control circuit, etc. Optionally, the optical switch module 202 may also be connected to a controller in the optical signal control device in which it is located or a controller of the optical transmission node, and under the control of a control signal outside the optical switch module 202, the on-off state of at least one wavelength channel in the first optical signal and the second optical signal is adjusted.

[0159] In summary, the optical switch module of the optical signal control device provided in the embodiment of the present application adjusts the on-off state of the at least one wavelength channel in the received first optical signal and the second optical signal after the detection module detects that the power change of at least one wavelength channel of the second optical signal is greater than the power change threshold, so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal, and output the third optical signal. When the power change of at least one wavelength channel of the second optical signal is large (such as in the wave adding state or the wave dropping state), the wavelength channel with a large power change is replaced with the corresponding wavelength channel in the first optical signal, thereby obtaining the third optical signal, and the power of the third optical signal is stable. In this way, the combination change of the wavelength channels of the target band can be reduced, the gain change of each wavelength channel inside the optical amplifier and the optical power change of each wavelength channel caused by SRS can be reduced, thereby reducing the degradation of the optical power and signal-to-noise ratio of the wavelength channel, reducing the bit error of the receiver, and reducing the performance impact on the optical transmission system.

[0160] Furthermore, when the third optical signal is an optical signal in a full wavelength state in the target wavelength band, the performance degradation of the remaining wavelength channels can be further reduced.

[0161] The WSS in the traditional optical transmission node can allocate an additional port, which is used to receive the false optical signal. While performing various complex functions such as adjusting the bandwidth of different wavelength channels, scheduling different wavelengths between different ports, and adjusting the wavelength channel optical power attenuation, the WSS can replace the false optical signal with the real wave signal. However, due to the complex functions of the WSS in the optical transmission node, the hardware performance cannot support the rapid replacement of the false optical signal and the real wave signal, resulting in a long service interruption time during the replacement process, resulting in interruption delay that can be perceived by the upper-layer service.

[0162] The optical signal control device provided in the embodiment of the present application is arranged outside the WSS of the optical transmission node. On the one hand, it does not need to occupy the additional port of the WSS device, simplifies the WSS structure of the optical transmission node, and reduces the manufacturing cost of the WSS. On the other hand, due to the simplification of the structure of the optical signal control device compared with the traditional WSS, it can realize the rapid replacement of the false optical signal and the true wave signal, and the replacement speed is increased from the traditional second level to the millisecond level, thereby reducing the possible service interruption time, or compressing the service interruption time to within 50ms, and realizing the interruption delay that the upper layer service does not perceive.

[0163] The optical signal control device 20 provided in the embodiment of the present application can be set at any position of the optical transmission system according to the needs of the optical transmission system. For example, it can be set in an optical transmission node. Figures 15 to 17 It is a schematic diagram of the structure of three optical transmission nodes 30 provided in an embodiment of the present application, and the optical transmission node 30 includes a WSS 301 and / or an optical amplifier 302. For example, the optical transmission node 30 is a reconfigurable optical add-drop multiplexer (ROADM) or an optical amplifier node, and the optical amplifier node includes one or more optical amplifiers.

[0164] In an optional manner, the optical transmission node 30 includes one or more WSS301, and an optical signal control device 20 provided in an embodiment of the present application is disposed after at least one WSS301. For example, an optical signal control device 20 is disposed after each WSS301. In another optional manner, the optical transmission node 30 includes one or more optical amplifiers 302, and an optical signal control device 20 provided in an embodiment of the present application is disposed before at least one optical amplifier 302. For example, an optical signal control device 20 is disposed before each optical amplifier 302.

[0165] In the embodiment of the present application, the optical transmission node 30 can have a variety of structures, and its structure can refer to Figure 1 and Figure 2 , Figure 8 , Fig.15 , Fig.16 and Fig.17 , and the aforementioned structures may also be deformed. The present application embodiment does not limit the structure of the optical transmission node. Figure 8 In the embodiment, a first-stage optical amplifier 302 is arranged after each WSS 301 , and each optical signal control device 20 is located between one WSS 301 and one first-stage optical amplifier 302 .

[0166] Fig.16 and Fig.17 In the embodiment, the optical transmission node 30 includes a multi-stage optical amplifier 302, and the optical signal control device 20 is located between any two adjacent optical amplifiers 302 of the multi-stage optical amplifier 302. It is worth noting that the optical signal control device 20 can also be located before the first optical amplifier (also called the optical amplifier input stage) of the multi-stage optical amplifier 302.

[0167] Fig.18 It is a structural diagram of a specific optical transmission node 30 provided in an embodiment of the present application. Fig.18 In the description, an example is taken in which the optical switch module 202 of the optical signal control device 20 is located between two-stage optical amplifiers 302 . The optical switch module 202 may also be located between the WSS 301 and the first-stage amplifier 302 .

[0168] In the embodiment of the present application, the optical amplifier may be an erbium doped fiber amplifier (EDFA) or a Raman amplifier.

[0169] In the embodiment of the present application, the target wavelength band of the second optical signal may be an S-band, a C-band or an L-band. For example, the wavelength range of the S-band is 1460nm to 1530nm, the wavelength range of the C-band is 1530nm to 1565nm, and the wavelength range of the L-band is 1565nm to 1625nm.

[0170] In summary, in the optical transmission node provided by the embodiment of the present application, after detecting that the power change of at least one wavelength channel of the second optical signal is greater than the power change threshold, the optical signal control device adjusts the on-off state of the at least one wavelength channel in the received first optical signal and the second optical signal, so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal, and output the third optical signal. When the power change of at least one wavelength channel of the second optical signal is large (such as being in a wavelength-adding state or a wavelength-dropping state), it is updated to the third optical signal output, effectively reducing the degradation of the optical transmission performance of the remaining wavelength channels caused by the power change of the at least one wavelength channel.

[0171] An embodiment of the present application provides an optical transmission system, which may include an optical signal control device 20 provided in an embodiment of the present application. Fig.19 It is a structural schematic diagram of an optical transmission system 40 provided in an embodiment of the present application. The optical transmission system 40 includes at least two optical transmission nodes, and the optical transmission node is any one of the optical transmission nodes 30 in the aforementioned embodiments; the target bands corresponding to different optical transmission nodes 30 are different from each other. For example, the target bands corresponding to the at least two optical transmission nodes are any two or three of the S band, the C band, and the L band. For example, the optical transmission system 40 includes two optical transmission nodes 30, and the corresponding target bands are the C band and the L band, respectively, then the band of the optical transmission system 40 can be called the C+L band; or, the optical transmission system 40 includes three optical transmission nodes 30, and the corresponding target bands are the C band, the L band, and the S band, respectively, then the band of the optical transmission system 40 can be called the S+C+L band.

[0172] Fig. 20 is a schematic diagram of the structure of another optical transmission system 40 provided in an embodiment of the present application. The optical transmission system 40 can reduce the influence of the stimulated Raman effect on the optical power. Each of the at least two optical transmission nodes includes an optical amplifier, and the optical transmission system 40 also includes:

[0173] The power detection module 401 is used to detect power information of the at least two optical transmission nodes 30. The power information is optical power information.

[0174] The gain control module 402 is used to perform optical amplifier gain control of at least two target bands corresponding to the at least two optical transmission nodes 30 based on the power information of the at least two optical transmission nodes 30 .

[0175] Optionally, the power detection module 401 is further configured to output alarm information indicating that the power information of a certain optical transmission node 30 is lower than a preset power value when it is detected that the power information of the optical transmission node 30 is lower than a preset power value.

[0176] In an embodiment of the present application, based on the power information of at least two optical transmission nodes 30, the optical amplifier gains of the at least two target bands are controlled to reduce the power transfer caused by the stimulated Raman effect based on the adjustment of the optical amplifier gains, thereby improving the reliability of the optical transmission system.

[0177] The embodiment of the present application provides an optical transmission structure, which includes the aforementioned at least two optical transmission nodes 30. The aforementioned embodiment is described by taking an optical transmission system including one optical transmission structure as an example. In actual implementation, the optical transmission system may include multiple optical transmission structures. Fig.21 FIG. 4 is a schematic diagram of the structure of another optical transmission system 40 provided in an embodiment of the present application. Fig.21As shown, the optical transmission system 40 includes multiple optical transmission structures, each of which includes multiple optical transmission nodes, and at least one optical transmission structure includes the aforementioned power detection module 401 and gain control module 402. Fig.21 The optical transmission system 40 includes two optical transmission structures as an example for description, and the two optical transmission structures are respectively a first optical transmission structure and a second optical transmission structure. The first optical transmission structure includes a plurality of optical transmission nodes, each optical transmission node 30 includes an optical signal control device 20, and the second optical transmission structure includes a plurality of optical transmission nodes. Fig.21 It is described by taking an example that the optical transmission node 30 included in the first optical transmission structure is a ROADM and the optical transmission node 30 included in the second optical transmission structure is an optical amplifier node.

[0178] Taking an optical transmission structure provided with a power amplifier control structure in an optical transmission system as an example, the optical transmission structure includes s groups of power amplifier control structures (not shown in the figure), s is a positive integer, and each group of power amplifier control structures includes a power detection module 401 and a gain control module 402. The power detection module 401 in each group of power amplifier control structures is used to feed back the detected power information to the corresponding gain control module 402. The aforementioned optical transmission structure includes one or more stages of optical amplifiers, and a group of power amplifier control structures can be set after at least one stage of optical amplifiers. For example, a group of power amplifier control structures can be set after each stage of optical amplifier R, and the group of power amplifier control structures is used to control the optical amplifier R of that stage. Optionally, the i-th stage optical amplifier of the optical transmission structure includes the i-th optical amplifier arranged along the optical signal transmission direction (i.e., the direction in which the optical signal is transmitted on the main line of the optical fiber) of each optical transmission node of the at least two optical transmission nodes. 1≤i≤I, I is the total number of optical amplifiers on each optical transmission node. Optionally, s≤I, for example, I=s. Fig.21 It is respectively assumed that the first optical transmission structure and the second optical transmission structure both include a stage of optical amplifier, that is, in the two optical transmission structures, I=1, and a group of power amplifier control structures are arranged after each stage of optical amplifier.

[0179] Each optical amplifier has an input end, an output end and a control end, and the optical amplifier is arranged in the main line of the optical link through the input end and the output end. Assuming that the power amplifier control structure M1 is used to control a certain level of optical amplifier M2 in the optical transmission system 40, the power detection module 401 in the power amplifier control structure M1 is used to obtain the power information of the output end of each optical amplifier in the certain level of optical amplifier M2; the gain control module 402 in the power amplifier control structure M1 is used to output a control signal to the control end of each optical amplifier in the certain level of optical amplifier M2, so as to control the optical gain of the optical amplifier.

[0180] In an embodiment of the present application, the optical transmission structure also includes other structures. For example, the optical transmission structure also includes a wavelength combiner / demultiplexer, and the wavelength combiner / demultiplexer is used to combine and / or demultiplex optical signals. Fig.21 Schematically, in the optical transmission system 40, the first optical transmission structure includes the first combiner / demultiplexer 403, and the second optical transmission structure includes the second combiner / demultiplexer 404 and the third combiner / demultiplexer 405 as an example for description, but the number and position of the combiners / demultiplexers are not limited. Fig.21 Only the optical signal control device 20 is provided in the first optical transmission structure as an example for description. In actual implementation, while the optical signal control device 20 is provided in the first optical transmission structure, the optical signal control device 20 may also be provided in the second optical transmission structure. Alternatively, the optical signal control device 20 is not provided in the first optical transmission structure, and the optical signal control device 20 is provided in the second optical transmission structure.

[0181] In an optional manner, the power information is an instantaneous power value. For each group of power amplifier control structures, the gain control module 402 is used to: calculate the power change value of each of the at least two optical transmission nodes based on the instantaneous power value of the at least two optical transmission nodes; and perform optical amplifier gain control of the at least two target bands based on the power change value of each of the optical transmission nodes.

[0182] Fig. 22 Schematic diagram of a power amplifier control structure provided in an embodiment of the present application. Assume that an optical transmission structure provided with a power amplifier control structure includes Q optical transmission nodes, Q ≥ 2, for example, 2 ≤ Q ≤ 3. The power amplifier control structure also includes: Q optical splitters 405 and a photoelectric converter 406 connected to each optical splitter. The Q optical splitters 405 correspond one-to-one to the Q optical transmission nodes.

[0183] Each optical splitter 405 is used to split the fifth optical signal of the target band of the corresponding optical transmission node into a sixth optical signal of part of the power. The optical splitter 405 can be set on the optical link used to transmit the fifth optical signal. It has an input end and two output ends. The optical splitter 405 divides the fifth optical signal input at the input end into two paths, namely the sixth optical signal of the target band and the seventh optical signal of the target band. The seventh optical signal is the new fifth optical signal, and its power is reduced relative to the power of the fifth optical signal input to the optical splitter, but the business information it carries is not reduced. This process uses the split part of the fifth optical signal for power information detection. For example, the ratio of the power of the seventh optical signal to the power of the fifth optical signal ranges from 1% to 10%, for example, the ratio of the power of the seventh optical signal to the power of the fifth optical signal is 5%. In this way, it can be ensured that the splitting of the optical signal has little effect on the power of the seventh optical signal.

[0184] The photoelectric converter 406 is used to convert the received sixth optical signal into an electrical signal, and output the converted electrical signal to the power detection module 401. By way of example, the photoelectric converter 406 may be a PD.

[0185] For a set of power amplifier control structures, the power detection module 401 is used to determine the instantaneous power value of the optical power of each band in the Q target bands based on the received electrical signals transmitted by the Q photoelectric converters 406, wherein the instantaneous power value of the optical power of each band in the Q target bands refers to the instantaneous power value of Q optical amplifiers belonging to different target bands and at the same level. The Q optical amplifiers are the optical amplifiers used for detection by the power detection module 401.

[0186] In an optional manner, the gain control module 402 is used to determine the power change value of each of the Q target bands based on the stimulated Raman effect model and the instantaneous power value of the optical power of each of the Q target bands. The stimulated Raman effect model satisfies:

[0187] (ΔP_1,ΔP_2,...ΔP_Q)=f(P_1,P_2,...P_Q);

[0188] Wherein, f represents a stimulated Raman effect model, P_1 to P_Q represent the instantaneous power value of the optical power of each of the Q target bands, respectively; ΔP_1 to ΔP_Q represent the power change value of each of the Q target bands, respectively. For example, the stimulated Raman effect model can be a machine learning model.

[0189] Optionally, the stimulated Raman effect model also needs to determine the power change value of each of the Q target bands based on other parameters and the instantaneous power value of the optical power of each of the Q target bands. The other parameters include: fiber length, fiber type, optical amplifier type parameters, fixed insertion loss and / or setting coefficients corresponding to the Q target bands. Among them, the fiber length refers to the fiber length between the combining port of Q optical transmission nodes to the demultiplexing port of the next group of optical transmission nodes, that is, the fiber length between one optical transmission structure to the next optical transmission structure. Fig.21 For example, the fiber length of the first optical transmission structure refers to the fiber length between the first optical transmission structure and the second optical transmission structure. Similarly, the fiber type refers to the fiber type between the wavelength combining port of Q optical transmission nodes and the wavelength splitting port of the next group of optical transmission nodes.

[0190] The other parameters may be pre-issued to the gain control module 402 by the main controller or network management in the optical transmission system, and the other parameters may be updated periodically to ensure the accuracy of the parameters. The gain control module 402 may store the other parameters in the form of a parameter table. For example, as shown in Table 1, Table 1 is a schematic table of the parameter table stored by the gain control module 402. Taking the table marked as K1 as an example, the other parameters recorded include: the optical fiber length is 80 km (kilometers), the optical fiber type is G.652, the optical amplifier type is OA_x, and the fixed insertion loss is IL01.

[0191] Table 1

[0192]

[0193] Correspondingly, the gain control module 402 is also used to: perform gain control on the optical amplifiers of the Q target bands respectively based on the power change value of each band in the determined Q target bands: ΔP_1, ΔP_2, ... ΔP_Q. For example, reverse compensation for the power change caused by the stimulated Raman effect makes the system performance more stable. For example, assuming ΔP_1 = 5dB, the corresponding optical amplifier of band 1 is controlled to subtract 5dB of the power change value; ΔP_1 = -5dB, the corresponding optical amplifier of band 1 is controlled to increase the power change value of 5dB.

[0194] It should be noted that the aforementioned optical transmission system 40 may also include other structures, such as one or more of an optical transmitter, an optical receiver, a network management, a main controller, a wavelength division multiplexer or an optical modulator, which will not be elaborated in the embodiments of the present application.

[0195] The optical signal control device, optical transmission node, and optical transmission system provided in the embodiments of the present application can be applied to the methods described below. The workflow and working principle of each module in the embodiments of the present application can be found in the description of each embodiment below.

[0196] Fig.23 This application is a flowchart of an optical signal control method provided by an embodiment. The method can be applied to the aforementioned optical signal control device, such as Fig.23 As shown, the method includes:

[0197] S501: Detect whether a power change of a second optical signal outside an optical signal control device in at least one wavelength channel is greater than a preset power change threshold.

[0198] In an optional implementation, the power change of the at least one wavelength channel greater than the power change threshold indicates a wavelength drop state or a wavelength add state, wherein the wavelength drop state is the state where the at least one wavelength channel changes from having a wavelength to having no wavelength, and the wavelength add state is the state where the at least one wavelength channel changes from having no wavelength to having a wavelength.

[0199] S502: After detecting that the power change of the at least one wavelength channel is greater than a power change threshold, adjust the on / off state of the at least one wavelength channel in the first optical signal and the second optical signal generated by the optical signal control device, so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal.

[0200] refer to Fig. 9 The process of adjusting the on-off state of at least one wavelength channel in the first optical signal and the second optical signal by the optical signal control device includes: controlling the mutual replacement of wavelength channels of the same wavelength of the first optical signal and the second optical signal, and the mutual replacement process includes: replacing the first wavelength channel of the second optical signal with the first wavelength channel of the first optical signal, or replacing the first wavelength channel of the first optical signal with the first wavelength channel of the second optical signal; the first wavelength channel of the second optical signal and the first wavelength channel of the first optical signal have the same wavelength. In this way, the wavelength channel combination of the third optical signal finally outputted relative to the second optical signal (i.e., the second optical signal before adding or dropping wavelength) emitted by the transmitting end can be kept unchanged.

[0201] In an optional manner, the optical signal control device (such as the detection module 203) can detect the wavelength drop state or the wavelength add state by detecting the pilot signal. In an optional example, the wavelength channel carrying the service information in the second optical signal is modulated with a pilot signal having multiple pilot frequency points, and the multiple pilot frequency points correspond to multiple wavelength channels respectively. After detecting that at least one pilot frequency point switches from a signal non-lost state to a signal lost state, the optical signal control device determines that the wavelength channel corresponding to the at least one pilot frequency point is in a wavelength drop state; after detecting that at least one pilot frequency point switches from a signal lost state to a signal non-lost state, the optical signal control device determines that the wavelength channel corresponding to the at least one pilot frequency point is in a wavelength add state.

[0202] Accordingly, in an optional implementation manner, in S502, after detecting that the power change of the at least one wavelength channel is greater than the power change threshold, adjusting the on-off state of the at least one wavelength channel in the first optical signal and the second optical signal generated by the optical signal control device so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal, the process includes:

[0203] After determining that the first wavelength channel of the second optical signal is in a wavelength drop state, the first wavelength channel of the first optical signal is controlled to be turned on, and the first wavelength channel of the second optical signal is controlled to be turned off. For example, the first wavelength channel is turned on by performing a first filtering process on the first wavelength channel, and the wavelength of the turned-on first wavelength channel is within a bandpass filtering range.

[0204] In another optional implementation, in S502, after detecting that the power change of the at least one wavelength channel is greater than the power change threshold, adjusting the on-off state of the at least one wavelength channel in the first optical signal and the second optical signal generated by the optical signal control device so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal, includes:

[0205] After determining that the first wavelength channel of the second optical signal is in a wavelength adding state, the first wavelength channel of the first optical signal is controlled to be turned off, and the first wavelength channel of the second optical signal is controlled to be turned on, and the first wavelength channel of the first optical signal and the first wavelength channel of the second optical signal have the same wavelength. For example, by performing a second filtering process on the first wavelength channel, the first wavelength channel is turned off, and the wavelength of the turned-off first wavelength channel is within the band-stop filtering range.

[0206] The above-mentioned on-off control process of the wavelength channel may refer to the corresponding process performed by the above-mentioned optical switch module 202 .

[0207] The optical signal control method provided by the embodiment of the present application, after detecting that the power change of at least one wavelength channel of the second optical signal is greater than the power change threshold, adjusts the on-off state of at least one wavelength channel in the received first optical signal and the second optical signal, so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal, and output the third optical signal. When the power change of at least one wavelength channel of the second optical signal is large (such as in the wave adding state or the wave dropping state), the wavelength channel with a large power change is replaced with the corresponding wavelength channel in the first optical signal, thereby obtaining the third optical signal, and the power of the third optical signal is stable. In this way, the combination change of the wavelength channel of the target band can be reduced, the gain change of each wavelength channel inside the optical amplifier and the optical power change of each wavelength channel caused by SRS can be reduced, thereby reducing the degradation of the optical power and signal-to-noise ratio of the wavelength channel, reducing the bit error of the receiver, and reducing the performance impact on the optical transmission system.

[0208] Furthermore, when the third optical signal is an optical signal in a full wavelength state in the target wavelength band, the performance degradation of the remaining wavelength channels can be further reduced.

[0209] It should be noted that the sequence of the optical signal control method provided in the embodiment of the present application can be appropriately adjusted, and the steps can be increased or decreased accordingly according to the situation. Any technician familiar with the technical field can easily think of the changed methods within the technical scope disclosed in the present application, and they should be included in the protection scope of the present application, so they will not be repeated here.

[0210] Fig.24This is a flow chart of an optical signal control method provided by an embodiment of the present application. The method can be applied to the aforementioned optical transmission system, which includes at least two optical transmission nodes, and the target bands corresponding to different optical transmission nodes are different. Fig.24 As shown, the method includes:

[0211] S601. Detect power information of at least two optical transmission nodes.

[0212] The aforementioned power information is an instantaneous power value, that is, an instantaneous power value of optical power. For each optical transmission node, the instantaneous power value can be determined by dividing a sixth optical signal with a portion of the power of a fifth optical signal transmitted by the main line of the optical link, converting the sixth optical signal into an electrical signal, and determining the instantaneous power value of the optical transmission node based on the converted electrical signal.

[0213] S602: Based on power information of at least two optical transmission nodes, perform optical amplifier gain control of at least two target bands corresponding to the at least two optical transmission nodes.

[0214] For example, the process of performing optical amplifier gain control in S602 may include:

[0215] A1. Based on the instantaneous power values ​​of at least two optical transmission nodes, calculate the power change value of each of the at least two optical transmission nodes.

[0216] For example, it is assumed that the optical transmission system 40 includes one or more optical transmission structures, wherein the first optical transmission structure is one of the one or more optical transmission structures, and the first optical transmission structure includes Q optical transmission nodes, Q ≥ 2, for example, 2 ≤ Q ≤ 3. Then for the first optical transmission structure, based on the stimulated Raman effect model and the instantaneous power value of the optical power of each of the Q target bands, the power change value of each of the Q target bands is determined. The stimulated Raman effect model satisfies:

[0217] (ΔP_1,ΔP_2,...ΔP_Q)=f(P_1,P_2,...P_Q);

[0218] Wherein, f represents a stimulated Raman effect model, P_1 to P_Q represent the instantaneous power value of the optical power of each of the Q target bands, respectively; ΔP_1 to ΔP_Q represent the power change value of each of the Q target bands, respectively. For example, the stimulated Raman effect model can be a machine learning model.

[0219] Optionally, the stimulated Raman effect model also needs to determine the power change value of each of the Q target bands based on other parameters and the instantaneous power value of the optical power of each of the Q target bands. The other parameters include: the length of the optical fiber connected to the Q optical transmission nodes, the optical fiber type, the optical amplifier type parameter, the fixed insertion loss and / or the setting coefficient corresponding to the Q target bands. The other parameters can be pre-sent to the gain control module 402 by the main controller or network management in the optical transmission system, and the other parameters can be periodically updated to ensure the accuracy of the parameters. The gain control module 402 can store the other parameters in the form of a parameter table as shown in Table 1.

[0220] A2. Based on the power change value of each optical transmission node, perform optical amplifier gain control in at least two target bands.

[0221] For example, based on the power change value of each of the Q target bands: ΔP_1, ΔP_2, ... ΔP_Q (i.e., the power change value of each optical transmission node), the optical amplifiers of the Q target bands are gain controlled respectively. For example, the power change caused by the stimulated Raman effect is reversely compensated, so that the system performance is more stable.

[0222] The aforementioned optical signal control method can be executed by a group of power amplifier control structures in an optical transmission system. In actual implementation, at least two optical transmission nodes include one or more optical amplifiers, and a group of power amplifier control structures can be set after at least one optical amplifier. For example, a group of power amplifier control structures can be set after each optical amplifier R, and the group of power amplifier control structures is used to control the optical amplifier R of the stage, and each group of power amplifier control structures is used to execute the aforementioned S601 and S602.

[0223] In an embodiment of the present application, based on power information of at least two optical transmission nodes, the optical amplifier gains of the at least two target bands are controlled to reduce the power transfer caused by the Raman effect based on the adjustment of the optical amplifier gains, thereby improving the reliability of the optical transmission system.

[0224] The foregoing Fig.23 and Fig.24 The provided optical signal control method may also be executed by the same computer device, which may be a main controller of the optical transmission system.

[0225] It should be noted that the sequence of the optical signal control method provided in the embodiment of the present application can be appropriately adjusted, and the steps can be increased or decreased accordingly according to the situation. Any technician familiar with the technical field can easily think of the changed methods within the technical scope disclosed in the present application, and they should be included in the protection scope of the present application, so they will not be repeated here.

[0226] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific steps of the method described above can refer to the corresponding processes in the embodiments of the aforementioned optical signal control device, optical transmission node and optical transmission system, and will not be repeated here.

[0227] Optionally, Fig.25 It is a possible basic hardware architecture of the computer device provided in the embodiment of the present application.

[0228] See also Fig.25 , the computer device 700 includes a processor 701 , a memory 702 , a communication interface 703 and a bus 704 .

[0229] In the computer device 700, the number of processors 701 may be one or more. Fig.25 Only one of the processors 701 is shown. Optionally, the processor 701 may be a CPU. If the computer device 700 has multiple processors 701, the types of the multiple processors 701 may be different or the same. Optionally, the multiple processors 701 of the computer device 700 may also be integrated into a multi-core processor.

[0230] The memory 702 stores computer instructions and data; the memory 702 may store computer instructions and data required to implement the optical signal control method provided in the present application, for example, the memory 702 stores instructions for implementing the steps of the optical signal control method. The memory 702 may be any one or any combination of the following storage media: non-volatile memory (e.g., read-only memory (ROM), solid-state drive (SSD), hard disk (HDD), optical disk), volatile memory.

[0231] The communication interface 703 may be any one or any combination of the following devices: a network interface (eg, an Ethernet interface), a wireless network card, or other device with a network access function.

[0232] The communication interface 703 is used for the computer device 700 to perform data communication with other computer devices or terminals.

[0233] The bus 704 can connect the processor 701 to the memory 702 and the communication interface 703. In this way, the processor 701 can access the memory 702 through the bus 704, and can also use the communication interface 703 to exchange data with other computer devices or terminals.

[0234] In the present application, the computer device 700 executes the computer instructions in the memory 702, so that the computer device 700 implements the optical signal control method provided in the present application, or the computer device 700 deploys the optical signal control device.

[0235] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory including instructions, and the above instructions can be executed by a processor of a computer device to complete the optical signal control method shown in various embodiments of the present application. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0236] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product, and the computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server, data center, etc. that contains one or more available media integrated. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium, or a semiconductor medium (e.g., a solid-state hard disk), etc.

[0237] In the present application, the terms "first", "second" and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. The term "at least one" means one or more, and the term "plurality" means two or more, unless otherwise expressly defined. A refers to B, which means that A is the same as B or A is a simple variation of B. The correspondence between wavelength channel A and wavelength channel B means that the wavelength of wavelength channel A is the same as that of wavelength channel B. The "wavelength" in the foregoing embodiments of the present application refers to the wavelength of light, and the "power" refers to the optical power.

[0238] It should be noted that: when the optical signal control device provided in the above embodiment executes the optical signal control method, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the optical signal control device, optical transmission node, optical transmission system and optical signal control method embodiment provided in the above embodiment belong to the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0239] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0240] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An optical signal control device, characterized in that: The device comprises: A light source, used to output a first optical signal, wherein the first optical signal is an optical signal that does not carry service information and is located in a wavelength band greater than or equal to a target wavelength band, wherein the target wavelength band is a wavelength band of a second optical signal transmitted on an optical link of an optical transmission node where the optical signal control device is located; An optical switch module, the optical switch module having a first input end, a second input end and an output end, the first input end is used to receive the first optical signal, the second input end is used to receive the second optical signal, and the output end is used to output a third optical signal to an optical link of an optical transmission node where the optical signal control device is located; A detection module, used to detect that a power change of the second optical signal in at least one wavelength channel is greater than a preset power change threshold; The optical switch module is used to adjust the on-off state of the at least one wavelength channel in the received first optical signal and the second optical signal after the detection module detects that the power change of the at least one wavelength channel is greater than the power change threshold, so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal.

2. The optical signal control device according to claim 1, characterized in that: The power change of at least one wavelength channel greater than the power change threshold indicates a wavelength drop state or a wavelength add state, wherein the wavelength drop state is the state where at least one wavelength channel changes from having wavelength to having no wavelength, and the wavelength add state is the state where at least one wavelength channel changes from having no wavelength to having wavelength.

3. The optical signal control device according to claim 2, characterized in that: The wavelength channel carrying the service information in the second optical signal is modulated with a pilot signal having a plurality of pilot frequencies, and the plurality of pilot frequencies correspond to the plurality of wavelength channels respectively. The detection module is used to detect the pilot signal; The optical switch module is used for: After the detection module detects that at least one pilot frequency point switches from a signal non-lost state to a signal lost state, determining that the wavelength channel corresponding to the at least one pilot frequency point is in the wavelength dropped state; After the detection module detects that at least one pilot frequency point switches from a signal loss state to a signal non-loss state, it is determined that the wavelength channel corresponding to the at least one pilot frequency point is in the wavelength addition state.

4. The optical signal control device according to claim 2, characterized in that: The optical switch module is used for: After determining that the first wavelength channel of the second optical signal is in the wavelength drop state, controlling the first wavelength channel of the first optical signal received by the first input end to be turned on, and controlling the first wavelength channel of the second optical signal received by the second input end to be turned off; or, After determining that the first wavelength channel of the second optical signal is in the wavelength-adding state, the first wavelength channel of the first optical signal received by the first input end is controlled to be turned off, and the first wavelength channel of the second optical signal received by the second input end is controlled to be turned on, and the first wavelength channel of the first optical signal and the first wavelength channel of the second optical signal have the same wavelength.

5. The optical signal control device according to claim 4, characterized in that: The optical switch module is used for: The first wavelength channel is subjected to a first filtering process so as to be turned on, and the wavelength of the turned on first wavelength channel is within a bandpass filtering range; the first wavelength channel is subjected to a second filtering process so as to be turned off, and the wavelength of the turned off first wavelength channel is within a bandstop filtering range.

6. The optical signal control device according to any one of claims 1 to 5, characterized in that: The optical switch module is used for: The first wavelength channel of the second optical signal is replaced by the first wavelength channel of the first optical signal, or the first wavelength channel of the first optical signal is replaced by the first wavelength channel of the second optical signal; the first wavelength channel of the second optical signal and the first wavelength channel of the first optical signal have the same wavelength, and the first wavelength channel of the second optical signal is one or more wavelength channels of at least one wavelength channel whose detected power change is greater than a threshold.

7. The optical signal control device according to any one of claims 1 to 5, characterized in that: The optical signal control device further includes: an optical splitter, configured to split the second optical signal into a fourth optical signal with a partial power; A photoelectric converter is used to convert the fourth optical signal into an electrical signal, and output the converted electrical signal to the detection module.

8. The optical signal control device according to any one of claims 1 to 5, characterized in that: The optical switch module comprises: a first optical filter having an input end and an output end, the input end of the first optical filter being the first input end, and the first optical filter being used to filter a received first optical signal; a second optical filter having an input end and an output end, the input end of the second optical filter being the second input end, the second optical filter being used to filter the received second optical signal, and for wavelength channels of the same wavelength, the filtering characteristics of the first optical filter and the second optical filter are opposite; An optical combiner, wherein the optical combiner has two input ends and one output end, the two input ends are respectively connected to the output end of the first optical filter and the output end of the second optical filter, the output end of the optical combiner is the output end of the optical switch module, and the optical combiner is used to combine the filtered first optical signal and the filtered second optical signal received by the two input ends to obtain the third optical signal.

9. The optical signal control device according to claim 8, characterized in that: At least one of the first optical filter and the second optical filter is a wavelength blocker.

10. The optical signal control device according to claim 8, characterized in that: The splitting ratio of the input end of the optical combiner connected to the first optical filter is smaller than the splitting ratio of the input end of the optical combiner connected to the second optical filter.

11. The optical signal control device according to any one of claims 1 to 5, characterized in that: The optical switch module comprises: A first optical splitter having an input end and n third output ends, a second optical splitter having an input end and n fourth output ends, n optical switches and an optical combiner, wherein n is a positive integer greater than 1, each of the n optical switches having a third input end, a fourth input end and a fifth output end, and the optical combiner having n input ends and 1 output end; The input end of the first optical splitter is the first input end, and the first optical splitter is used to split the received first optical signal to obtain optical signals of n wavelength channels, and input the optical signals of the n wavelength channels to the third input ends of the n optical switches through the n third output ends respectively; The input end of the second optical splitter is the second input end, and the second optical splitter is used to split the received second optical signal to obtain optical signals of n wavelength channels, and input the optical signals of the n wavelength channels to the fourth input ends of the n optical switches through the n fourth output ends respectively; The wavelengths of the optical signals received by the third input end and the fourth input end of each optical switch are the same, and each optical switch is used to select one of the optical signal received by the third input end and the optical signal received by the fourth input end to be output from the fifth output end; The output end of the optical combiner is the output end of the optical switch module, the n input ends of the optical combiner are used to respectively receive n optical signals output by n optical switches, and the optical combiner is used to combine the n optical signals to obtain the third optical signal.

12. An optical transmission node, characterized in that: The optical transmission node comprises a wavelength selective switch WSS and / or an optical amplifier, and the optical transmission node further comprises an optical signal control device as claimed in any one of claims 1 to 11.

13. The optical transmission node according to claim 12, characterized in that: The optical transmission node comprises: one or more WSSs, and a first-level optical amplifier arranged after each WSS, and each optical signal control device is located between one WSS and one first-level optical amplifier; Alternatively, the optical transmission node includes a multi-stage optical amplifier, and the optical signal control device is located between any two adjacent stages of the multi-stage optical amplifier.

14. The optical transmission node according to claim 12 or 13, characterized in that: The target wavelength band of the second optical signal is the S wavelength band, the C wavelength band or the L wavelength band.

15. An optical transmission system, characterized in that: The optical transmission system comprises at least two optical transmission nodes, and the optical transmission nodes are the optical transmission nodes according to any one of claims 12 to 14; Different optical transmission nodes correspond to different target bands.

16. The optical transmission system according to claim 15, characterized in that: Each of the optical transmission nodes includes an optical amplifier, and the optical transmission system further includes: A power detection module, used to detect power information of the at least two optical transmission nodes; The gain control module is used to perform optical amplifier gain control of at least two target bands corresponding to the at least two optical transmission nodes based on the power information of the at least two optical transmission nodes.

17. The optical transmission system according to claim 16, characterized in that: The power information is an instantaneous power value, and the gain control module is used to: Calculating a power change value of each of the at least two optical transmission nodes based on the instantaneous power values ​​of the at least two optical transmission nodes; Based on the power change value of each of the optical transmission nodes, optical amplifier gain control of the at least two target wavelength bands is performed.

18. A method for controlling an optical signal, characterized in that: The method comprises: receiving and detecting that a power change of a second optical signal on an optical link of an optical transmission node where an optical signal control device is located in at least one wavelength channel is greater than a preset power change threshold; After detecting that the power change of the at least one wavelength channel is greater than the power change threshold, adjusting the on-off state of the at least one wavelength channel in the first optical signal and the second optical signal generated by the optical signal control device, so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain a third optical signal, and the third optical signal is output to the optical link of the optical transmission node, wherein the first optical signal is an optical signal that does not carry service information, and the wavelength band of the first optical signal is greater than or equal to the target wavelength band, and the target band is the wavelength band of the second optical signal.

19. The method according to claim 18, characterized in that The power change of at least one wavelength channel greater than the power change threshold indicates a wavelength drop state or a wavelength add state, wherein the wavelength drop state is the state where at least one wavelength channel changes from having wavelength to having no wavelength, and the wavelength add state is the state where at least one wavelength channel changes from having no wavelength to having wavelength.

20. The method according to claim 19, characterized in that The wavelength channel carrying the service information in the second optical signal is modulated with a pilot signal having a plurality of pilot frequencies, and the plurality of pilot frequencies correspond to the plurality of wavelength channels respectively. The method further includes: After detecting that at least one pilot frequency point switches from a signal non-lost state to a signal lost state, determining that a wavelength channel corresponding to the at least one pilot frequency point is in the wavelength dropped state; After detecting that at least one pilot frequency point switches from a signal loss state to a signal non-loss state, it is determined that a wavelength channel corresponding to the at least one pilot frequency point is in the wavelength addition state.

21. The method according to claim 19, characterized in that After detecting that the power change of the at least one wavelength channel is greater than a power change threshold, adjusting the on / off state of the at least one wavelength channel in the first optical signal and the second optical signal generated by the optical signal control device so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal, comprising: After determining that the first wavelength channel of the second optical signal is in the wavelength drop state, controlling the first wavelength channel of the first optical signal to be turned on, and controlling the first wavelength channel of the second optical signal to be turned off; or, After determining that the first wavelength channel of the second optical signal is in the wavelength adding state, the first wavelength channel of the first optical signal is controlled to be turned off, and the first wavelength channel of the second optical signal is controlled to be turned on, and the first wavelength channel of the first optical signal and the first wavelength channel of the second optical signal have the same wavelength.

22. The method according to claim 21, characterized in that The controlling the first wavelength channel of the first optical signal to be turned on comprises: Performing a first filtering process on the first wavelength channel so as to make the first wavelength channel conductive, wherein the wavelength of the conductive first wavelength channel is within a bandpass filtering range; The controlling the first wavelength channel of the second optical signal to be turned off includes: The first wavelength channel is shut down by performing a second filtering process on the first wavelength channel, and the wavelength of the shut-down first wavelength channel is within a band-stop filtering range.

23. The method according to any one of claims 18 to 22, characterized in that: After detecting that the power change of the at least one wavelength channel is greater than a power change threshold, adjusting the on / off state of the at least one wavelength channel in the first optical signal and the second optical signal generated by the optical signal control device so that the adjusted first optical signal and the adjusted second optical signal are combined to obtain the third optical signal, comprising: The first wavelength channel of the second optical signal is replaced by the first wavelength channel of the first optical signal, or the first wavelength channel of the first optical signal is replaced by the first wavelength channel of the second optical signal; the first wavelength channel of the second optical signal and the first wavelength channel of the first optical signal have the same wavelength, and the first wavelength channel of the second optical signal is one or more wavelength channels of at least one wavelength channel whose detected power change is greater than a threshold.

24. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions instruct a computer device to execute the optical signal control method according to any one of claims 18 to 23.

25. A chip, characterized in that: The chip includes a programmable logic circuit and / or program instructions, and is used to execute the optical signal control method according to any one of claims 18 to 23 when the chip is running.

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