Signal flatness adjustment method, electronic device and computer-readable medium

Abstract

Provided in the embodiments of the present application are a signal flatness adjustment method, an electronic device and a computer-readable medium. The method comprises: determining signal flatness of each optical channel among a plurality of optical channels of a multiple section to be adjusted in a DWDM system; taking an optical channel, the signal flatness of which does not meet a predetermined threshold value, among the plurality of optical channels as a target optical channel; and adjusting a power attenuation amount of the target optical channel until the signal flatness of an optical signal which is transmitted by means of the target optical channel meets the predetermined threshold value.

Description

Signal flatness adjustment method, electronic device and computer readable medium

[0001] Cross-references

[0002] The present invention claims priority to a Chinese patent application filed with the Patent Office of China on June 29, 2023, with application number 2023107945260, entitled “A method, device and electronic device for adjusting signal flatness”. The entire contents of the application are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of optical communication technology, and in particular to a method for adjusting signal flatness, an electronic device, and a computer-readable storage medium. Background Art

[0004] With the rapid development of bandwidth-intensive services such as 5G, cloud computing, mobile internet, and ultra-high-definition video, network traffic will continue to grow rapidly. For example, major domestic and foreign operators have put forward transmission requirements for high-performance 400G and beyond 400G (such as 600G, 800G, etc.) large-capacity dense wavelength division multiplexing (DWDM) systems.

[0005] However, for high-performance 400G and beyond-400G DWDM systems, how to ensure signal transmission performance remains a technical problem that urgently needs to be solved in this field.

[0006] Summary of the Invention

[0007] The purpose of the embodiments of the present application is to provide a method for adjusting signal flatness, an electronic device, and a computer-readable medium.

[0008] To solve the above technical problems, the embodiments of the present application are implemented through the following aspects.

[0009] In a first aspect, an embodiment of the present application provides a method for adjusting signal flatness, the method comprising: determining the signal flatness of each optical channel among multiple optical channels of a multiplexing section to be adjusted in a DWDM system; selecting an optical channel among the multiple optical channels whose signal flatness does not meet a predetermined threshold as a target optical channel; and adjusting the power attenuation of the target optical channel until the signal flatness of the optical signal transmitted through the target optical channel meets the predetermined threshold.

[0010] In a second aspect, an embodiment of the present application provides an electronic device comprising: a memory, a processor, and computer-executable instructions stored on the memory and executable on the processor, wherein the computer-executable instructions, when executed by the processor, implement the steps of the method described in the first aspect.

[0011] In a third aspect, an embodiment of the present application provides a computer-readable storage medium, which is used to store computer-executable instructions. When the computer-executable instructions are executed by a processor, the steps of the method described in the first aspect are implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0013] FIG1 shows a schematic structural diagram of a DWDM system provided in an embodiment of the present application.

[0014] FIG2 shows a schematic structural diagram of a ROADM provided in an embodiment of the present application.

[0015] FIG3 is a schematic flow chart showing a method for adjusting signal flatness provided in an embodiment of the present application.

[0016] FIG4 shows a schematic diagram of adjusting the power attenuation of a sub-channel provided in an embodiment of the present application.

[0017] FIG5 a shows one of the schematic diagrams of the signal spectrum provided in an embodiment of the present application.

[0018] FIG5 b shows a second schematic diagram of a signal spectrum provided in an embodiment of the present application.

[0019] FIG5c shows a third schematic diagram of a signal spectrum provided in an embodiment of the present application.

[0020] FIG5 d shows a fourth schematic diagram of a signal spectrum provided in an embodiment of the present application.

[0021] FIG6 shows a schematic structural diagram of a signal flatness adjustment device provided in an embodiment of the present application.

[0022] FIG7 is a schematic diagram of the hardware structure of an electronic device that executes the signal flatness adjustment method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] To help those skilled in the art better understand the technical solutions in this application, the following will provide a clear and complete description of the technical solutions in the embodiments of this application, in conjunction with the accompanying drawings. Obviously, the described embodiments are only a portion of the embodiments of this application, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of this application without inventive effort shall fall within the scope of protection of this application.

[0024] Regarding the problem of poor transmission performance in high-performance 400G and beyond-400G (600G, 800G, etc.) DWDM systems proposed in the related art, this application takes into account that the implementation of high-performance 400G and beyond-400G (such as 600G, 800G, etc.) DWDM systems requires a higher baud rate (Baud), and as a result, the channel bandwidth occupied by signal transmission will also increase. According to the loss coefficient curve of the optical fiber, it can be seen that the attenuation coefficient of the optical fiber is different at different frequency points. Among them, when the frequency range occupied by the transmission channel is small, the attenuation curve in the transmission channel can be considered to be constant. When the frequency range occupied by the transmission channel increases, the attenuation difference between the maximum frequency and the minimum frequency points in the entire transmission channel cannot be ignored. As the attenuation difference between the maximum frequency point and the minimum frequency point in the transmission channel increases, the unevenness of the transmission channel will also become non-negligible. Then, when the signal is transmitted through this transmission channel, the unevenness of the transmission channel will be transmitted to the signal, resulting in poor signal flatness and a decrease in the signal-to-noise ratio on the side with low signal power. In severe cases, effective information of the signal will be lost, affecting the transmission performance of the signal and resulting in poor transmission performance of the DWDM system.

[0025] To this end, the present application provides a signal flatness adjustment method, electronic device, and computer-readable medium. By adjusting the flatness of an optical signal transmitted in a DWDM system, the flatness of the optical signal is compensated for the unevenness of the transmission channel caused by optical fiber loss, thereby avoiding the loss of effective components in the optical signal. After the signal passes through this DWDM system, the flatness of the entire signal can meet the reception performance requirements, thereby achieving the purpose of improving the transmission performance of the DWDM system.

[0026] For ease of understanding, as shown in Figure 1, a structural diagram of a DWDM system provided in one embodiment of the present application is shown. The DWDM system includes a reconfigurable optical add-drop multiplexer (ROADM) network (unidirectional), which can dynamically adjust the wavelength of the add or drop service through remote reconfiguration.

[0027] Taking a service path in the DWDM system as an example, the optical signal to be transmitted passes through the starting point of the optical termination multiplexer (OTM) site, optical multiplexing sections (such as MSN 1, MSN 2, and MSN 3), and ROADM sites (such as ROADM1 and ROADM1) to reach the end point of the OTM site, completing the transmission of the optical signal. The structural diagram of the ROADM site can be, but is not limited to, that shown in Figure 2. The optical signal arriving at the ROADM site is input via A-In (or B-In or OTU) and output via B-Out (or A-Out) to achieve optical signal transmission. The following is an introduction to the components involved in the DWDM system.

[0028] Optical Transform Unit (OUT): Access processing of optical signals.

[0029] OTM: Used to insert data and other service signals on optical transmission equipment (SDH) into DWDM lines through wavelength conversion and multiplexing units, and to separate them from DWDM lines through demultiplexing units.

[0030] Wavelength selectors (WSSs) can control the channel bandwidth (dynamically setting the channel spacing as needed) and the direction of signal light transmission. They can also split a wide channel into multiple sub-channels and adjust the power of each sub-channel. Currently, mainstream WSS manufacturers offer WSS devices with minimum frequency spacing of 12.5 GHz or 6.25 GHz.

[0031] Optical Amplifier (OA): When signals pass through lossy equipment such as optical fibers or WSS, they experience attenuation. To ensure system transmission performance, an OA compensates for this attenuation and restores the signal power to the desired level. Typically, a site has only one optical power amplifier, known as an optical amplifier site. For example, OA1 in Figure 2 constitutes an optical amplifier site.

[0032] In addition, as shown in Figures 1 and 2, OBA is a power amplifier, OPM is an optical power meter or optical monitoring module, and OPA is a preamplifier.

[0033] It is understandable that FIG1 and FIG2 are only schematic diagrams of a DWDM system. In actual applications, a DWDM system may include more or fewer devices than those shown in FIG1 and FIG2 , and this is not limited here.

[0034] Based on this, the technical solution provided by this application is further introduced below in combination with the accompanying drawings and embodiments, as follows.

[0035] FIG3 shows a flow chart of a method 300 for adjusting signal flatness provided in an embodiment of the present application. The method 300 may include but is not limited to the following steps.

[0036] S310 , determining the signal flatness of each optical channel among multiple optical channels of a multiplex section to be adjusted in a DWDM system.

[0037] The multiplexing sections in the DWDM system can be defined according to actual needs. For example, as shown in FIG1 , the transmission channel in the DWDM system can be defined as three multiplexing sections, such as multiplexing section 1, multiplexing section 2, and multiplexing section 3.

[0038] Based on this, the multiplex section to be adjusted may include, but is not limited to, one or more of the defined multiplex sections. In this embodiment, there may be multiple ways to determine the multiplex section to be adjusted. For example, the multiplex section to be adjusted may be determined based on monitoring the flatness of the optical signal in the DWDM system. For example, the transmission channel in the DWDM system may be divided into multiple multiplex sections (e.g., multiplex section 1, multiplex section 2, and multiplex section 3). When the flatness of the optical signal transmitted through a certain multiplex section does not meet a predetermined threshold (which may be determined based on the receiving requirements of the receiving end), the certain multiplex section is determined as the multiplex section to be adjusted.

[0039] Alternatively, the multiplex section to be adjusted may also be specified by the user based on experience, such as specifying a multiplex section among multiple multiplex sections as the multiplex section to be adjusted, which is not limited here.

[0040] In this case, as a possible implementation, there are multiple ways to determine the signal flatness of multiple optical channels in the multiplex section to be adjusted in the DWDM system. For example, the spectral shape of each optical channel in the multiplex section to be adjusted can be monitored by an OPM, and the signal flatness of each optical channel can be determined based on the spectral shape of each optical channel. As shown in Figure 1, the OPM can be installed at the signal output end of the multiplex section to be adjusted. In other words, the signal flatness described above refers to the flatness of the output signal.

[0041] S120 : Taking an optical channel whose signal flatness does not meet a predetermined threshold among the multiple optical channels as a target optical channel.

[0042] As mentioned above, the predetermined threshold can be determined based on, but not limited to, the receiving performance requirements of the DWDM system, and is not limited here. In addition, there can be one or more target optical channels, and is not limited here.

[0043] S130: Adjust the power attenuation of the target optical channel until the signal flatness of the optical signal transmitted through the target optical channel meets the predetermined threshold.

[0044] In this embodiment, signal flatness adjustment (also known as pre-configuration or compensation) is performed at the granularity of a single optical channel to achieve the purpose of adjusting the flatness of the optical signal in the multiplexing section to be adjusted, so that the signal flatness after passing through this DWDM system can meet the reception performance requirements, thereby ensuring the transmission performance of the DWDM system.

[0045] It is worth noting that, if there are multiple multiplex sections to be adjusted in the DWDM system, the signal flatness of each multiplex section to be adjusted can be adjusted sequentially according to the optical signal transmission direction of the DWDM system until the signal flatness of each multiplex section to be adjusted meets the predetermined threshold. The signal flatness adjustment process for each multiplex section to be adjusted can refer to the relevant description in S110-S130 above, and the same or corresponding technical effects can be achieved, and will not be repeated here. It is understood that the predetermined thresholds for different multiplex sections can be the same or different.

[0046] Based on this, in one implementation, in addition to the aforementioned adjustment based on a single optical channel as the granularity, the present application can further divide the single optical channel when adjusting the power attenuation of the target optical channel, and adjust the signal flatness based on the divided sub-channels as the granularity to improve the adjustment accuracy and further improve the transmission performance of the DWDM system.

[0047] For example, as shown in Figures 1 and 2, considering that the DWDM system includes a WSS, the WSS supports n×6.25GHz bandwidth power adjustment function, and the service signal will pass through the WSS after passing through the multiplexer / demultiplexer and ROADM site, therefore, in this embodiment, for adjusting the power attenuation of the target optical channel, the target optical channel is divided into multiple sub-channels through the WSS, and then the power attenuation of the optical signal input to each sub-channel is adjusted respectively until the signal flatness of the optical signal transmitted through the target optical channel meets the predetermined threshold. Wherein, the WSS is set at the signal input end of the multiplex section to be adjusted.

[0048] In some embodiments, when the target optical channel is divided into multiple sub-channels by the WSS, the target optical channel can be divided into multiple sub-channels according to the signal flatness and bandwidth of the target optical channel, wherein there is no frequency gap overlap between the multiple sub-channels.

[0049] For example, when the signal flatness of the target optical channel is less than a first threshold, the target optical channel is divided into L first sub-channels according to the bandwidth of the target optical channel.

[0050] When the signal flatness of the target optical channel is not less than the first threshold but less than the second threshold, the target optical channel is divided into M second sub-channels according to the bandwidth of the target optical channel.

[0051] When the signal flatness of the target optical channel is not less than the second threshold, the target optical channel is divided into N third sub-channels according to the bandwidth of the target optical channel.

[0052] Wherein, L, M, and N are all integers greater than 1, and L < M < N, and the bandwidth of the first sub-channel is greater than the bandwidth of the second sub-channel, and the bandwidth of the second sub-channel is greater than the bandwidth of the third sub-channel.

[0053] Exemplarily, assuming that the bandwidth of the target optical channel is 150 GHz, the first threshold is 3 dB, and the second threshold is 7 dB, then when the signal flatness is less than 3 dB, the target optical channel can be divided into 3 sub-channels with a bandwidth of 50 GHz; when the signal flatness is greater than 3 dB but less than 7 dB, the target optical channel can be divided into 4 sub-channels with a bandwidth of 37.5 GHz; when the signal flatness is greater than 7 dB, the target optical channel can be divided into 6 sub-channels with a bandwidth of 25 GHz.

[0054] It should be noted that when performing the foregoing division of sub-channels in this application, in addition to the same bandwidth of each sub-channel provided in the foregoing example, according to different actual requirements, the bandwidth of each divided sub-channel can also be different to ensure the flexibility and adaptability of signal flatness adjustment.

[0055] Of course, the more the number of sub-channels, the better the signal flatness of the multiplexing section to be adjusted is optimized, but the algorithm complexity will increase.

[0056] Based on this, in one implementation manner, when adjusting the power attenuation amount of each sub-channel respectively, the reference power can be determined first according to the signal flatness of the target optical channel, and then for each sub-channel, the power attenuation amount of the sub-channel is adjusted according to the difference between the reference power and the power at the center frequency of the sub-channel. Among them, there are various ways to determine the reference power. For example, the optical power corresponding to a frequency point in the frequency range corresponding to the target optical channel (or sub-channel) can be selected as the reference power, etc., which is not limited herein.

[0057] For example, please refer to Figure 4. Assuming that the determined reference power is P, the powers at the center frequencies of the divided sub-channels are P1, P2, P3, and P4 respectively. Then, the attenuation a corresponding to sub-channel 1 is a=P-P1, the attenuation b corresponding to sub-channel 2 is a=P-P2, the attenuation c corresponding to sub-channel 3 is a=P-P3, and the attenuation d corresponding to sub-channel 4 is a=P-P4. When adjusting the power attenuation of each sub-channel, if a, b, c, and d are positive numbers, it can be considered that the attenuation of the corresponding sub-channel is increased; if they are negative numbers, it can be considered that the attenuation is decreased.

[0058] In one implementation, considering the scenario where the transmission channel bandwidth occupied by signal transmission in a DWDM system is relatively wide (e.g., channel bandwidth greater than 100 GHz), the different gains of the optical power amplifier will also cause the transmission channel to be uneven, affecting the transmission performance of the DWDM system. For example, the gain of the optical power amplifier varies at different frequency points. When the frequency range occupied by the transmission channel is small, the gain within the transmission channel can be considered constant. As the frequency range occupied by the transmission channel increases, the gain difference between the maximum and minimum frequency points within the entire transmission channel cannot be ignored, and thus the gain unevenness within the transmission channel cannot be ignored. Based on this, when the signal (also called an optical signal or service signal) is transmitted through this transmission channel, the gain unevenness of the optical power amplifier in the transmission channel will be transmitted to the signal, causing the signal-to-noise ratio on the side with low signal power to decrease, which can seriously lead to the loss of effective information of the signal, affecting the transmission performance of the DWDM system.

[0059] In this regard, in this embodiment, after completing the signal flatness adjustment caused by optical fiber attenuation through WSS, the total output power of each optical power amplifier in the multiplexing segment to be adjusted can be further adjusted to the target power, wherein the target power can be determined in the network planning stage, such as 192.1THz wavelength single-wave power 5dBm, etc.

[0060] It's worth noting that since the optical power amplifier port cannot maintain single-channel signal power, the total output power of the optical power amplifier can be adjusted to equal the single-channel power multiplied by the total wavenumber. In this case, the single-wavelength power can be considered to have met the target power requirement. For example, if the target power of a 192.1THz single-channel wavelength is 5dBm and the total wavenumber of the system is 40, then the output power of each optical power amplifier through which the 192.1THz channel service signal is transmitted end-to-end is: 5 + 10 * log10 (40) = 21dBm.

[0061] In this embodiment, for scenarios where the channel bandwidth occupied by signal transmission in a DWDM system is relatively wide, the transmission channel occupied by the signal is divided into multiple sub-channels by using WSS, and combined with the uneven characteristics of optical fiber loss and optical power amplifier gain, the sub-channels of WSS are used to pre-edit the entire multiplexing segment to be adjusted to compensate for the uneven transmission channel caused by optical fiber loss and uneven optical power amplifier gain, so that the flatness of the entire signal after passing through this transmission system can meet the receiving performance requirements.

[0062] Of course, this application can also be applied to scenarios where the channel bandwidth occupied by signal transmission is relatively small. However, it is worth noting that, since the channel non-flatness is very small within a relatively small channel bandwidth, and is limited by the accuracy of WSS in adjusting the channel flatness, the benefits of continuing to use the aforementioned signal flatness adjustment solution provided by this application will be significantly reduced, and the algorithm complexity will be significantly increased compared to the solution without WSS channel pre-editing. Therefore, the impact of channel non-flatness on the service signal can be ignored within a relatively small channel bandwidth.

[0063] Based on the description of the aforementioned signal flatness adjustment method, the signal flatness adjustment process provided in the present application is further exemplarily illustrated below in combination with FIG. 1 , FIG. 2 , and FIG. 5 a - FIG. 5 d , as follows.

[0064] Among them, it is assumed that the signal flatness adjustment scheme provided in this application is applied to the transmission scenario of 400G quadrature phase shift keying (QPSK) 130G Baud signal at a spacing of 150GHz, that is, according to the transmission and channel configuration requirements of the DWDM system, assuming that the DWDM system is a 40-wave system, the service signal wavelength output by the OTU is 192.1THz, 400G QPSK 130GBaud, and the channel occupied by the end-to-end transmission of the signal is 150GHz. First, the channel bandwidth of all WSSs with a central wavelength of 192.1THz through which the service is transmitted end-to-end is configured to 150GHz, that is, the channel bandwidth of the central wavelength of 192.1THz of WSS1, WSS3 and WSS4 of the ROADM1 site, WSS3 and WSS4, and WSS2 of the ROADM2 site is configured to be 150GHz.

[0065] And according to the system power requirements, the 192.1THz signal power at each OA output end in the link is adjusted to the target power (set in the network planning stage), such as 5dBm single-wave power at 192.1THz wavelength.

[0066] Based on this, assuming that the signal in each multiplexing section is affected by the unevenness of optical fiber loss and optical power amplifier gain, that is, there are target optical channels in each multiplexing section that do not meet the predetermined threshold, then for the DWDM system, the signal flatness adjustment process involved is as follows.

[0067] S501: Divide the multiplexing sections in the DWDM system. As shown in Figure 1, the section from the OTM site to the ROADM1 site is defined as multiplexing section 1, the section from the ROADM1 site to the ROADM2 site is defined as multiplexing section 2, and the section from the ROADM2 site to the OTM site is defined as multiplexing section 3. The signal flatness of the 192.1 THz channel within each multiplexing section is adjusted one by one.

[0068] S502: Assuming that the signal flatness of the 192.1 THz channel of multiplex section 1 is adjusted first, then, as shown in Figure 1, OPM1 can be used to detect the spectrum of the signal transmitted by multiplex section 1 (as shown in Figure 5a). This spectrum only passes through WSS1 and OBA and is close to the OTU output spectrum.

[0069] As shown in Figure 2, the 192.1 THz channel received signal spectrum can be detected using OPM3 at the ROADM1 site. This spectrum is the signal spectrum of the signal sent by the OTU at the starting point of the OTM site after passing through WSS1, OBA, fiber span 1, OA1, fiber span 2, and ROADM1 site OA7, as shown in Figure 5b.

[0070] S503, in conjunction with OPM3 at the ROADM1 site, detects the spectral flatness of the signal received on the 192.1 THz channel. The 192.1 THz channel is divided into several sub-channels as needed through WSS1. Each sub-channel has a bandwidth of n × 6.25 GHz (n ≥ 1). The bandwidth of each sub-channel can be different, and there is no frequency gap overlap between each sub-channel. The sum of the bandwidths of all sub-channels is 150 GHz.

[0071] It is worth noting that when dividing the sub-channels, according to the characteristics of WSS, the minimum bandwidth of the sub-channel can be 6.25 GHz, that is, the entire channel can be divided into a maximum of 24 6.25 GHz sub-channels, as shown in Figure 5c.

[0072] S504 , combining with OPM3 at the ROADM1 site to detect the signal spectrum flatness of the 192.1 THz channel receiving signal, and adjusting the power attenuation of each sub-channel respectively. The adjustment process is shown in FIG4 .

[0073] S505 , using OPM3 at the ROADM1 site to detect the spectral flatness of the 192.1 THz channel received signal (the spectrum is shown in FIG5 d ) to determine whether the signal flatness of the adjusted signal meets a predetermined threshold.

[0074] S506: If the spectral flatness of the received signal of the 192.1 THz channel detected by OPM3 at the ROADM1 site does not meet the predetermined threshold, S504 and S505 are repeated to continue adjusting the power attenuation of each sub-channel of WSS1 until the signal flatness meets the predetermined threshold.

[0075] S507 , if the spectral flatness of the received signal of the 192.1 THz channel detected by OPM3 at the ROADM1 site meets the predetermined threshold, then according to S503 - S506 , the signal flatness of each optical channel in the multiplex section 1 is adjusted.

[0076] S508: After the signal flatness of each channel of multiplex section 1 is adjusted, since the output power of each OA in multiplex section 1 may vary, the gain of each OA is further adjusted so that the output power of each OA meets the OA output power requirement, such as reaching the target power.

[0077] S509: After completing the signal flatness adjustment for multiplex section 1, continue adjusting the signal flatness of each optical channel in multiplex sections 2 and 3 according to S503-S508. In multiplex section 2, the signal flatness of each channel is detected by OPM3 at the ROADM2 site and signal flatness is adjusted by WSS4 at the ROADM1 site. In multiplex section 3, the signal flatness of each channel is detected by OPM2 at the OTM site endpoint and signal flatness is adjusted by WSS4 at the ROADM2 site.

[0078] S510 , signal flatness adjustment of each channel of multiplex section 1, multiplex section 2, and multiplex section 3 is completed, ie, it is determined that the flatness adjustment of each signal in the end-to-end transmission of the DWDM system is completed.

[0079] It can be understood that the implementation process of the above-mentioned S501-S510 can refer to the relevant description in the above-mentioned method embodiment, and will not be repeated here.

[0080] FIG6 is a schematic structural diagram of a signal flatness adjustment device 600 provided in an embodiment of the present application. The device 600 includes: a determination module 610 for determining the signal flatness of each optical channel in a multiplex section to be adjusted in a DWDM system, and selecting an optical channel among the multiple optical channels whose signal flatness does not meet a predetermined threshold as a target optical channel; and an adjustment module 620 for adjusting the power attenuation of the target optical channel until the signal flatness of the optical signal transmitted through the target optical channel meets the predetermined threshold.

[0081] In some embodiments, the adjustment module 620 adjusts the power attenuation amount of the target optical channel until the signal flatness of the optical signal transmitted through the target optical channel meets the predetermined threshold, including: dividing the target optical channel into multiple sub-channels by a wavelength selector WSS, where the WSS is disposed at the signal input end of the to-be-adjusted multiplexing section; respectively adjusting the power attenuation amounts of the optical signals input to each of the sub-channels until the signal flatness of the optical signal transmitted through the target optical channel meets the predetermined threshold.

[0082] In some embodiments, the adjustment module 620 divides the target optical channel into multiple sub-channels by a wavelength selector WSS, including: dividing the target optical channel into multiple sub-channels according to the signal flatness and bandwidth size of the target optical channel; where there is no frequency gap overlap between the multiple sub-channels.

[0083] In some embodiments, the adjustment module 620 divides the target optical channel into multiple sub-channels according to the signal flatness and bandwidth size of the target optical channel, including at least one of the following: when the signal flatness of the target optical channel is less than a first threshold, dividing the target optical channel into L first sub-channels according to the bandwidth size of the target optical channel; when the signal flatness of the target optical channel is not less than the first threshold but less than a second threshold, dividing the target optical channel into M second sub-channels according to the bandwidth size of the target optical channel; when the signal flatness of the target optical channel is not less than the second threshold, dividing the target optical channel into N third sub-channels according to the bandwidth size of the target optical channel; where L, M, and N are all integers greater than 1, and L < M < N, and the bandwidth size of the first sub-channel is greater than the bandwidth size of the second sub-channel, and the bandwidth size of the second sub-channel is greater than the bandwidth size of the third sub-channel.

[0084] In some embodiments, the bandwidth size of each sub-channel is the same.

[0085] In some embodiments, the adjustment module 620 respectively adjusts the power attenuation amounts of each of the sub-channels, including: determining a reference power according to the signal flatness of the target optical channel; for each of the sub-channels, adjusting the power attenuation amount of the sub-channel according to the difference between the reference power and the power at the center frequency of the sub-channel.

[0086] In some embodiments, the determination module 610 determines the signal flatness of multiple optical channels in a multiplexing section to be adjusted in a DWDM system, including: monitoring the spectral shape of each optical channel in the multiplexing section to be adjusted through an optical monitoring module OPM, wherein the OPM is set at the signal output end of the multiplexing section to be adjusted; and determining the signal flatness of each optical channel according to the spectral shape of each optical channel.

[0087] In some embodiments, the adjustment module 620 adjusts the power attenuation of the target optical channel until the signal flatness of the optical signal transmitted through the target optical channel meets the predetermined threshold, and the method further includes: adjusting the total output power of each optical power amplifier in the multiplexing section to be adjusted to the target power.

[0088] In some embodiments, the adjustment module 620 is further used to adjust the signal flatness of each of the multiplexing sections to be adjusted in turn according to the optical signal transmission direction in the DWDM system when there are multiple multiplexing sections to be adjusted in the DWDM system until the signal flatness of each of the multiplexing sections to be adjusted meets the predetermined threshold.

[0089] The device 600 provided in the embodiment of the present application can execute the various methods described in the above method embodiments and realize the functions and beneficial effects of the various methods described in the above method embodiments, which will not be repeated here.

[0090] FIG7 shows a schematic diagram of the hardware structure of an electronic device that implements an embodiment of the present application. Referring to the figure, at the hardware level, the electronic device includes a processor, and in some embodiments, an internal bus, a network interface, and a memory. Among them, the memory may include a memory, such as a high-speed random access memory (RAM), and may also include a non-volatile memory (non-volatile memory), such as at least one disk storage. Of course, the electronic device may also include hardware required for other services.

[0091] The processor, network interface, and memory can be interconnected via an internal bus, such as an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus. These buses can be classified as address buses, data buses, and control buses. For ease of illustration, the figure uses only one bidirectional arrow, but this does not imply that there is only one bus or only one type of bus.

[0092] The memory is used to store programs. Specifically, the program may include program code, which includes computer operating instructions. The memory may include internal memory and non-volatile memory, and provides instructions and data to the processor.

[0093] The processor reads the corresponding computer program from the non-volatile memory into the internal memory and then runs it, logically forming a device for locating a specific user. The processor executes the program stored in the memory and is specifically configured to perform the method disclosed in the embodiment shown in FIG2 and to achieve the functions and benefits of the various methods described in the method embodiments above, which will not be further described here.

[0094] The method disclosed in the embodiment shown in FIG2 of the present application can be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by hardware integrated logic circuits in the processor or software instructions. The above processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The various methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in conjunction with the embodiments of the present application can be directly embodied as being executed by a hardware decoding processor, or can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium well-known in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. The storage medium is located in the memory, and the processor reads the information in the memory and, in conjunction with its hardware, completes the steps of the above method.

[0095] The electronic device can also execute the methods described in the above method embodiments and realize the functions and beneficial effects of the methods described in the above method embodiments, which will not be described in detail here.

[0096] Of course, in addition to software implementation, the electronic device of this application does not exclude other implementation methods, such as logic devices or a combination of software and hardware, etc. That is to say, the execution subject of the following processing flow is not limited to each logic unit, but can also be hardware or logic devices.

[0097] It can be understood that the aforementioned electronic device can be the master control device of the DWDM system to realize signal control in the DWDM system, such as adjusting the flatness of the optical signal, etc., or it can be a control device set at a certain site in the DWDM system to be used for signal control at the site, such as adjusting the flatness of the optical signal, etc., without limitation here.

[0098] An embodiment of the present application also proposes a computer-readable storage medium, which stores one or more programs. When the one or more programs are executed by an electronic device including multiple applications, the electronic device executes the method disclosed in the embodiment shown in Figure 2 and realizes the functions and beneficial effects of the various methods described in the previous method embodiments, which will not be repeated here.

[0099] The computer-readable storage medium includes a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0100] Furthermore, an embodiment of the present application also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the following process is implemented: the method disclosed in the embodiments shown in Figures 1 to 3 and the functions and beneficial effects of the various methods described in the previous method embodiments are implemented, which will not be repeated here.

[0101] In short, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

[0102] The systems, devices, modules, or units described in the above embodiments may be implemented by computer chips or entities, or by products having certain functions. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0103] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0104] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0105] The various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiments are generally similar to the method embodiments, so the description is relatively simple. For relevant parts, refer to the description of the method embodiments.

Claims

1. A method for adjusting signal flatness, wherein: The method includes: Determining the signal flatness of each optical channel among multiple optical channels of a multiplex section to be adjusted in a DWDM system; Regarding the optical channels with signal flatness not meeting a predetermined threshold among the multiple optical channels as target optical channels; Adjusting the power attenuation amount of the target optical channels until the signal flatness of the optical signals transmitted through the target optical channels meets the predetermined threshold.

2. The method of claim 1, wherein: The adjusting the power attenuation amount of the target optical channels until the signal flatness of the optical signals transmitted through the target optical channels meets the predetermined threshold includes: Dividing the target optical channel into multiple sub-channels by a wavelength selector WSS, where the WSS is disposed at the signal input end of the multiplex section to be adjusted; Respectively adjusting the power attenuation amount of the optical signals input to each of the sub-channels until the signal flatness of the optical signals transmitted through the target optical channel meets the predetermined threshold.

3. The method of claim 2, wherein: The dividing the target optical channel into multiple sub-channels by the wavelength selector WSS includes: Dividing the target optical channel into multiple sub-channels according to the signal flatness and bandwidth size of the target optical channel; Among them, there is no frequency gap overlap between the multiple sub-channels.

4. The method of claim 3, wherein: Dividing the target optical channel into multiple sub-channels according to the signal flatness and bandwidth size of the target optical channel includes at least one of the following: When the signal flatness of the target optical channel is less than a first threshold, dividing the target optical channel into L first sub-channels according to the bandwidth size of the target optical channel; When the signal flatness of the target optical channel is not less than the first threshold but less than a second threshold, dividing the target optical channel into M second sub-channels according to the bandwidth size of the target optical channel; When the signal flatness of the target optical channel is not less than the second threshold, dividing the target optical channel into N third sub-channels according to the bandwidth size of the target optical channel; Wherein, L, M, and N are all integers greater than 1, and L < M < N, and the bandwidth size of the first sub-channel is greater than the bandwidth size of the second sub-channel, and the bandwidth size of the second sub-channel is greater than the bandwidth size of the third sub-channel.

5. The method of claim 3, wherein: The bandwidth size of each sub-channel is the same.

6. The method of claim 2, wherein: The respectively adjusting the power attenuation amount of each of the sub-channels includes: Determining a reference power according to the signal flatness of the target optical channel; For each of the sub-channels, adjusting the power attenuation amount of the sub-channel according to the difference between the reference power and the power at the center frequency of the sub-channel.

7. The method of claim 1, wherein: The determining the signal flatness of multiple optical channels in the multiplex section to be adjusted in the DWDM system includes: Monitoring the spectral shape of each optical channel in the multiplex section to be adjusted through an optical monitoring module OPM, where the OPM is disposed at the signal output end of the multiplex section to be adjusted; Determining the signal flatness of each optical channel according to the spectral shape of each optical channel.

8. The method according to any one of claims 1 to 7, wherein: After adjusting the power attenuation amount of the target optical channels until the signal flatness of the optical signals transmitted through the target optical channels meets the predetermined threshold, the method further includes: The total output power of each optical power amplifier in the multiplex section to be adjusted is adjusted to the target power.

9. The method according to any one of claims 1 to 7, wherein: The method further comprises: In the case where there are multiple multiplex sections to be adjusted in the DWDM system, According to the optical signal transmission direction in the DWDM system, the signal flatness of each of the multiplex sections to be adjusted is adjusted in turn until the signal flatness of each of the multiplex sections to be adjusted meets the predetermined threshold.

10. An electronic device, wherein: include: processor; as well as A memory arranged to store computer executable instructions which, when executed, cause the processor to perform the steps of the method of any one of claims 1 to 9.

11. A computer-readable medium, wherein: The computer-readable medium stores one or more programs, which, when executed by an electronic device including a plurality of application programs, enable the electronic device to perform the steps of the method according to any one of claims 1 to 9.

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