Control method for multiband optical transmission system, communication equipment, and storage medium

Abstract

This application discloses a control method for a multiband optical transmission system, communication equipment, and a storage medium, all belonging to the field of optical network communication technology. The control method for the multiband optical transmission system includes the steps of determining a plurality of power adjustment points in the optical signal transmission multiplexing unit of the multiband optical transmission system, and maintaining a uniform optical transmission power within the multiband optical transmission system by controlling the plurality of power adjustment points to jointly adjust the power within a band and the power between bands.

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application with the application number 202310801200.6, filed on June 30, 2023, and the entire content thereof is incorporated herein by reference.

[0002] This application relates to the field of optical communication technologies, and particularly to a control method for a multi-band optical transmission system, a communication device, and a computer-readable storage medium.

Background Art

[0003] In the field of optical communication, the SRS (Stimulated Raman Scattering) effect is an important factor affecting the performance of broadband multi-band optical transmission systems. This is because the SRS effect causes a power shift from short wavelengths to long wavelengths, resulting in a power unevenness phenomenon reaching approximately 100 nm in the Raman gain spectrum. As a result, the entire broadband multi-band optical transmission system cannot support long-distance transmission of optical signals. In addition, when a broadband multi-band optical transmission system transmits optical signals at high power, significant non-linear costs may occur, and the non-linear effect in the optical transmission system is also an important factor limiting the transmission distance of the system.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The main objective of this application is to provide a control method for a multi-band optical transmission system, a communication device, and a computer-readable storage medium.

[0005] To achieve the above objectives, an embodiment of the present invention provides a control method for a multiband optical transmission system. The method includes the steps of determining a plurality of power adjustment points in the optical signal transmission multiplexing section of the multiband optical transmission system, and maintaining a uniform optical transmission power in the multiband optical transmission system by controlling the plurality of power adjustment points to jointly adjust the power within a band and the power between bands.

[0006] Furthermore, embodiments of the present application provide a communication device, the communication device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the control method for the multiband optical transmission system described above.

[0007] Furthermore, embodiments of the present invention provide a computer-readable storage medium. A computer program is stored in the storage medium, and when the computer program is executed by a processor, the steps of the control method for the multiband optical transmission system described above are realized. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram of the structure of the operating equipment in the hardware operating environment according to the embodiment of the present invention. [Figure 2] This is a schematic flowchart showing the steps of one embodiment of the control method for a multiband optical transmission system according to the embodiment of the present invention. [Figure 3] This is a schematic diagram of a power adjustment point according to one embodiment of the control method for a multiband optical transmission system according to an embodiment of the present invention. [Figure 4] This is a schematic diagram of a power adjustment application process according to one embodiment of the control method for a multiband optical transmission system according to an embodiment of the present invention. [Figure 5] This is a schematic diagram illustrating the uniformity effect of the power adjustment receiving end according to one embodiment of the control method for a multiband optical transmission system according to an embodiment of the present invention.

[0009] The realization of the objectives, functional features, and advantages of this application will be further explained with reference to the attached drawings, along with the examples provided. [Modes for carrying out the invention]

[0010] Please understand that the specific embodiments described herein are used solely for illustrative purposes and are not intended to limit the scope of this application.

[0011] Referring to Figure 1, Figure 1 is a schematic diagram of the structure of the operating equipment in the hardware operating environment according to an embodiment of the present application.

[0012] In this embodiment, the operating device of the hardware operating environment according to the solution of the embodiment of the present application may be a communication device that is integrated into a multiband optical transmission system or is connected to the multiband optical transmission system in advance and thereby can effectively control the multiband optical transmission system, and the communication device may be a terminal such as a smartphone, PC, or tablet.

[0013] As shown in Figure 1, the operating device may include a processor 1001 such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and memory 1005. The communication bus 1002 is used to enable connection and communication between these components. The user interface 1003 may include a display and an input unit such as a keyboard. Optionally, the user interface 1003 may further include a standard wired interface or a wireless interface. Optionally, the network interface 1004 may include a standard wired interface, a wireless interface (such as a Wireless-Fidelity, Wi-Fi) interface, etc. The memory 1005 may be high-speed random access memory (RAM) or stable non-volatile memory (NVM) such as disk memory. Optionally, the memory 1005 may be a storage device independent of the processor 1001.

[0014] Those skilled in the art will understand that the structure shown in Figure 1 is not limiting to the operating equipment, and may include more or fewer components than shown in the figure, or may be a combination of specific components or different components.

[0015] As shown in Figure 1, the memory 1005 as a storage medium may include an operating system, a data storage module, a network communication module, a user interface module, and a computer program.

[0016] In the operating device shown in Figure 1, the network interface 1004 is mainly used for data communication with other devices, and the user interface 1003 is mainly used for data interaction with the user. The processor 1001 and memory 1005 in the operating device of this invention may be located in the operating device, and the operating device calls a computer program stored in the memory 1005 via the processor 1001 and performs the following operations: Determine a plurality of power adjustment points in the optical signal transmission multiplexing section of the multiband optical transmission system. Maintain a uniform optical transmission power in the multiband optical transmission system by controlling the plurality of power adjustment points to jointly adjust the power within a band and the power between bands.

[0017] Exemplary examples include an optical power amplifier, an optical line amplifier, and an optical preamplifier.

[0018] The processor 1001 can call a computer program stored in memory 1005 and perform the following operations: control and adjust the optical line amplifier and the optical preamplifier until the total output power of the optical line amplifier, the optical preamplifier and the optical power amplifier in each band satisfies a first preset condition; after the total output power satisfies the first preset condition, control the optical power amplifier to adjust the power between each band so that the output power between each band satisfies a second preset condition; and then control the optical power amplifier, the optical line amplifier and the optical preamplifier to adjust the power slope within each band.

[0019] For example, the processor 1001 can call a computer program stored in memory 1005 and perform the following operations: If the total output power does not satisfy a first preset condition, it repeatedly performs operations to control and adjust the optical line amplifier and optical preamplifier.

[0020] Exemplarily, the processor 1001 can call a computer program stored in the memory 1005 and further execute the following operations. When the difference between the first total output power and the second total output power is less than a first preset threshold, the total output power is determined to satisfy a first preset condition. Here, the difference between the first total output power is the difference in the total output power between the adjusted optical line amplifier and the optical power amplifier. The difference between the second total output power is the difference in the total output power between the adjusted optical preamplifier and the optical power amplifier.

[0021] Exemplarily, the multi-band optical signal transmitted by the multi-band optical transmission system includes a first band optical signal, a second band optical signal, and a third band optical signal.

[0022] The processor 1001 can call a computer program stored in the memory 1005 and further execute the following operations. Control the optical power amplifier to increase the first output power of the first band optical signal, decrease the second output power of the second band optical signal, and based on the adjustment amounts of the first output power and the second output power, control the optical power amplifier to adjust the third output power of the third band optical signal.

[0023] Exemplarily, the processor 1001 can call a computer program stored in the memory 1005 and further execute the following operations. In the process of controlling the optical power amplifier to adjust the power between bands, continuously monitor the total output power of the multi-band optical signal from the optical power amplifier. When the total output power of the multi-band optical signal from the optical power amplifier is constant, monitor the power difference between the first output power, the second output power, and the third output power. When the power difference is less than a second preset threshold, determine that the output power between each band satisfies a second preset condition.

[0024] Exemplarily, the processor 1001 can call a computer program stored in the memory 1005 and further execute the following operations. Based on the channel-level output power spectrum of the optical preamplifier at the end of the optical signal transmission multiplexing unit, determine the adjustment amount of the band slope of each band. Control the optical power amplifier, the optical line amplifier, and the optical preamplifier to adjust the power slope within each band according to the adjustment amount of each band slope.

[0025] Exemplarily, the processor 1001 can call a computer program stored in the memory 1005 and further execute the following operations. Measure the channel-level output power spectrum of the optical preamplifier at the end of the optical signal transmission multiplexing unit by an optical performance monitor, determine the band slope of each band of the optical signal by fitting based on the channel-level output power spectrum, and calculate the adjustment amount of the band slope of each band respectively based on each band slope.

[0026] Exemplarily, the processor 1001 can call a computer program stored in the memory 1005 and further execute the following operations. Based on the adjustment amount of the band slope, determine the slope adjustment ratio of each of the optical power amplifier, the optical line amplifier, and the optical preamplifier, and control the optical power amplifier, the optical line amplifier, and the optical preamplifier to adjust the power slope within each band according to each of the band slope adjustment ratios.

[0027] The processor 1001 calls a computer program stored in memory 1005 and controls the optical power amplifier, the optical line amplifier, and the optical preamplifier to adjust the power slope within each band according to the adjustment amount of each band slope. After this operation, the processor 1001 further performs the following operations: If the third preset condition is not met, the processor repeatedly controls the optical power amplifier to adjust the power between each band and controls the optical power amplifier, the optical line amplifier, and the optical preamplifier to adjust the power slope within each band. Here, the third preset condition is that the output power adjustment amount between each band is less than the third preset threshold, and the adjustment amount of the band slope for each band is less than the fourth preset threshold.

[0028] For example, if the third preset condition is met, the processor 1001 may call a computer program stored in memory 1005 and perform the following operations: determine a target output power spectrum based on the actual output power spectrum of the optical signal transmission multiplexer; determine the amount of channel-level power uniformity of the optical signal transmission multiplexer; determine the maximum nonlinear cost of the multiband optical transmission system based on the amount of channel-level power uniformity; and, if the maximum nonlinear cost satisfies the preset nonlinear effect conditions, determine and output the optical signal input power of the multiband optical transmission system.

[0029] For example, the processor 1001 may call a computer program stored in memory 1005 to determine the maximum nonlinear cost of the multiband optical transmission system according to the channel-level power uniformity, and then perform the following operations: If the maximum nonlinear cost does not satisfy the nonlinear effect condition, the processor may repeatedly control a plurality of power adjustment points to jointly adjust the power within the band and the power between bands until the maximum nonlinear cost satisfies the nonlinear effect condition.

[0030] Exemplary examples include the preset nonlinear effect conditions being that the value of the maximum nonlinear cost is less than a fifth preset threshold, the value of the filtering cost for optical signal transmission is less than a sixth preset threshold, and the optical signal-to-noise ratio margins of the worst-case waves in each band are equal and greater than or equal to a seventh preset threshold.

[0031] Based on the operating device structure of the hardware operating environment according to the embodiment of the present invention described above, we first propose an overall concept for a control method of a multiband optical transmission system according to the embodiment of the present invention.

[0032] In the field of optical communications, the SRS (Stimulated Raman Scattering) effect is a significant factor affecting the performance of broadband multiband optical transmission systems. This is because the SRS effect causes a power shift from short wavelengths to long wavelengths, resulting in a power unevenness phenomenon in the Raman gain spectrum reaching approximately 100 nm. As a result, broadband multiband optical transmission systems cannot support long-distance transmission of optical signals. Furthermore, broadband multiband optical transmission systems can incur significant nonlinear costs when transmitting optical signals at high power, and nonlinear effects in optical transmission systems are a significant factor limiting the transmission distance of the system.

[0033] In response to the above phenomenon, the embodiment of the present invention proposes a control method for a multiband optical transmission system. By determining a plurality of power adjustment points in the optical signal transmission multiplexing section of the multiband optical transmission system and controlling these power adjustment points to jointly adjust the power within a band and the power between bands, the optical transmission power within the multiband optical transmission system is maintained in a uniform state. That is, by jointly adjusting the power and power slope within and between bands, the SRS effect is sequentially made uniform, and the flatness of the power and optical signal-to-noise ratio OSNR at the optical receiving end is ensured. This avoids the low flatness of power due to the SRS effect and the nonlinear cost of exceeding the limit in the optical transmission system, thereby realizing highly reliable multiband, wideband, and long-distance transmission in the optical transmission system.

[0034] Based on the overall concept of the control method for a multiband optical transmission system according to the embodiment of the present invention described above, we propose various embodiments of the control method for a multiband optical transmission system according to the present invention.

[0035] The control method for a multiband optical transmission system of this application is applicable to the above-mentioned operating equipment, which may be a communication device integrated into or connected to the multiband optical transmission system. It should be understood that, based on different design requirements in actual use, the control method for a multiband optical transmission system of this application is applicable to other terminal equipment in various feasible embodiments. However, to facilitate understanding and explanation of the technical solution, the following description will explain the control method for a multiband optical transmission system of this application using a communication device as the implementing body of the solution.

[0036] Referring to Figure 2, Figure 2 is a schematic flowchart showing the steps of a first embodiment of the control method for a multiband optical transmission system of the present invention. Although the flowchart shows a logical sequence, in some cases the control method for a multiband optical transmission system of the present invention may perform the steps shown or described herein in a different order than those shown herein.

[0037] As shown in Figure 2, in the first embodiment of the control method for a multiband optical transmission system of the present invention, the control method for a multiband optical transmission system according to the embodiment of the present invention may include the following steps.

[0038] Step S10: Multiple power adjustment points are determined in the optical signal transmission multiplexing section of the multiband optical transmission system.

[0039] In this embodiment, during long-distance transmission of multiband optical signals by a multiband optical transmission system, a communication device determines multiple power adjustment points in the optical signal transmission multiplexing section of the multiband optical transmission system.

[0040] In this embodiment and other viable embodiments, the multiband optical transmission system may be an S+C+L optical transmission system for long-distance transmission of optical signals including the S-band, C-band, and L-band. Specifically, the S+C+L optical transmission system may be a long-distance 800G×80λ system applied to a next-generation OTN (optical transport network) network. It should also be understood that, based on different design requirements in actual use, the multiband optical transmission system may, of course, be other systems for transmitting optical signals including multiple bands.

[0041] For example, assuming that the above multiband optical transmission system uses a spectrally efficient 800G 85GBd PCS-64QAM modulation code and is configured as a high-capacity transmission system with an 87.5GHz raster, i.e., a C6T+L6T+S6T optical transmission system, the single-core capacitance of the C6T+L6T+S6T optical transmission system can support up to 800 × 204λ = 163.2 Tbit / s. However, as shown in Figure 3, when a communication device controls the C6T+L6T+S6T optical transmission system to transmit optical signals including S-band, C-band, and L-band over long distances, the optical power amplifier OBA, optical line amplifier OLA, and optical preamplifier OPA within each optical signal transmission multiplexer of the C6T+L6T+S6T optical transmission system can be determined as power adjustment points where band-level power adjustment is required.

[0042] In step S20, the optical transmission power within the multiband optical transmission system is maintained uniformly by controlling multiple power adjustment points to jointly adjust the power within a band and the power between bands.

[0043] In this embodiment, the communication equipment determines a plurality of power adjustment points in the optical signal transmission multiplexing section of the multiband optical transmission system, and then controls these power adjustment points to perform band-level power coordination for the power within a band and the power between bands, thereby maintaining the optical transmission power of the multiband optical transmission system in a uniform state at all times during the transmission of multiband optical signals.

[0044] For example, as shown in Figure 3, when a C6T+L6T+S6T optical transmission system transmits optical signals including S-band, C-band, and L-band signals over long distances, the wavelength division multiplexed signals of the S-band, C-band, and L-band optical signals pass through an optical cross-connect site, where channel attenuation and raster are configured for each service. At the optical cross-connect site, the entire band is completed by operating placeholder wavelength dummy light. After the total power of the optical signals is adjusted by optical attenuation, they enter the optical signal transmission multiplexing unit. At this point, the communication equipment controls the C6T+L6T+S6T optical transmission system to amplify the optical signal by an optical power amplifier OBA in the optical signal transmission multiplexer, then combine it by an optical band multiplexer OBM, and transmit it through the optical fiber link. Optical attenuation after the optical fiber is used to adjust span loss. Subsequently, the optical band multiplexer OBM separates the S-band, C-band, and L-band of the optical signal, the optical line amplifier OLA amplifies the service optical signal for each band, and then combines it again by the optical band multiplexer (OBM). Thus, after the optical signal has repeatedly passed through N-1 optical signal transmission multiplexer spans in this manner, and after passing through the last fiber span, it is divided by the optical band multiplexer OBM, enters the optical preamplifier OPA at the receiving end, and is power amplified. Finally, the optical signal transmission multiplexing unit reaches multiple optical cross-connect sites, where the direction of the S-band, C-band, and L-band optical signals is determined, and dummy light of placeholder wavelengths is also dropped / blocked at these optical cross-connect sites.

[0045] In this embodiment, the control method for a multiband optical transmission system according to the present invention determines a plurality of power adjustment points in the optical signal transmission multiplexing section of the multiband optical transmission system, and controls these plurality of power adjustment points to jointly adjust the power within a band and the power between bands. This maintains a uniform optical transmission power within the multiband optical transmission system, that is, by jointly adjusting the power and power slope within and between bands, the SRS effect is sequentially made uniform, and the flatness of the power and optical signal-to-noise ratio (OSNR) at the optical receiving end is ensured. This avoids the low flatness of power due to the SRS effect and the nonlinear cost of exceeding the limit in the optical transmission system, thereby realizing highly reliable multiband, wideband, and long-distance transmission of the optical transmission system.

[0046] In some functional embodiments of the control method for a multiband optical transmission system according to the present invention, the power adjustment points include an optical power amplifier OBA, an optical line amplifier OLA, and an optical preamplifier OPA. Based on this, the operation of "controlling a plurality of the power adjustment points to jointly adjust the power within a band and the power between bands" includes the steps of: controlling and adjusting the optical line amplifier and the optical preamplifier until the total output power of the optical line amplifier, the optical preamplifier and the optical power amplifier in each band satisfies a first preset condition; after the total output power satisfies the first preset condition, controlling the optical power amplifier to adjust the power between each band so that the output power between each band satisfies a second preset condition; and after adjusting the power between each band, controlling the optical power amplifier, the optical line amplifier and the optical preamplifier to adjust the power slope within each band.

[0047] In this embodiment, the communication equipment controls the optical power amplifier OBA, optical line amplifier OLA, and optical preamplifier OPA in each optical signal transmission multiplexing section of the multiband optical transmission system to jointly adjust the power within a band and between bands. In this process, the equipment can first control the optical line amplifier OLA and optical preamplifier OPA to adjust the power until the total output power of each of the optical line amplifier OLA and optical preamplifier OPA within each optical signal band, along with the optical power amplifier OBA, satisfies a first preset condition.

[0048] Subsequently, if the total output power of the optical line amplifier OLA and optical preamplifier OPA and the optical power amplifier OBA within each band of the optical signal satisfies the first preset condition, the communication device can further control the optical power amplifier OBA to perform power adjustment operations between the bands of the optical signal, and can repeat the power adjustment operations between the bands of the optical signal by controlling the optical power amplifier OBA until the output power between the bands of the optical signal satisfies the second preset condition.

[0049] Furthermore, the communication equipment can control the optical power amplifier OBA to adjust the power between each band of the optical signal, and then, together with the optical line amplifier OLA and optical preamplifier OPA, synchronously or asynchronously, control the optical power amplifier OBA to perform adjustment operations on the power slope within each band of the optical signal. In this way, the communication equipment controls the optical power amplifier OBA, optical line amplifier OLA, and optical preamplifier OPA of the optical signal transmission multiplexing unit, and jointly adjusts the power within a band and the power between bands, thereby maintaining a uniform optical transmission power for the entire multiband optical transmission system.

[0050] In some executable embodiments of the control method for a multiband optical transmission system according to the present invention, the control method for a multiband optical transmission system according to the present invention is If the total output power does not satisfy the first preset condition, the procedure may further include repeatedly performing operations to control and adjust the optical line amplifier and the optical preamplifier.

[0051] In this embodiment, the communication device continuously monitors the total output power of each of the optical line amplifier OLA and optical preamplifier OPA and the optical power amplifier OBA within each band of the optical signal during the process of controlling the optical line amplifier OLA and optical preamplifier OPA to adjust the power, and determines whether the total output power satisfies the first preset condition described above. In this way, each time the communication device controls the optical line amplifier OLA and optical preamplifier OPA to adjust the power, if it determines that the total output power still does not satisfy the first preset condition, it continues to repeat the operation of controlling the optical line amplifier OLA and optical preamplifier OPA to adjust the power. In this manner, the process of controlling the optical line amplifier OLA and optical preamplifier OPA to adjust the power is repeated until the total output power satisfies the first preset condition.

[0052] In some functional embodiments of the control method for a multiband optical transmission system of the present invention, the first preset condition described above may be that the difference in total output power between the optical line amplifier and the optical power amplifier after power adjustment is less than the first preset threshold, or that the difference in total output power between the optical preamplifier and the optical power amplifier after power adjustment is less than the first preset threshold. Here, the first preset threshold may specifically be 0.1 dB. In different functional embodiments based on different design requirements in actual use, the specific value of the first preset threshold may of course be other values, that is, the control method for a multiband optical transmission system of the present invention does not limit the specific value of the first preset threshold.

[0053] Based on this, the control method for the multiband optical transmission system of the present invention may further include the step of determining that the total output power satisfies a first preset condition if the difference between a first total output power and a second total output power is less than a first preset threshold.

[0054] In this embodiment, the first difference in total output power is the difference in total output power between the optical line amplifier and the optical power amplifier after power adjustment, while the second difference in total output power is the difference in total output power between the optical preamplifier and the optical power amplifier after power adjustment.

[0055] In this embodiment, the communication device controls the optical line amplifier OLA and the optical preamplifier OPA to adjust their power, and in the process of doing so, continuously monitors the total output power of each of the optical line amplifier OLA and the optical preamplifier OPA and the optical power amplifier OBA within each band of the optical signal. The device then calculates and determines the difference in total output power between the optical line amplifier and the optical power amplifier after power adjustment, i.e., the first difference in total output power, and / or calculates and determines the difference in total output power between the optical line amplifier and the optical power amplifier after power adjustment, i.e., the second difference in total output power.

[0056] Subsequently, the communication device compares the difference in the first total output power and / or the difference in the second total output power with the first preset threshold, and determines that the total output power of the optical line amplifier OLA and / or the optical preamplifier OPA and optical power amplifier OBA in each band of the optical signal satisfies the first preset condition only if the difference in the first total output power and / or the difference in the second total output power is less than the first preset threshold. Conversely, if the difference in the first total output power and / or the difference in the second total output power is greater than or equal to the first preset threshold, the communication device determines that the total output power does not satisfy the first preset condition.

[0057] TIFF2026522326000002.tif56170

[0058]

number

[0059] Here, N is the number of fiber spans included in a single optical signal transmission multiplexer, and Num_S, Num_C, and Num_L are the total number of wavelengths in the S, C, and L bands of the optical signal, respectively.

[0060] Furthermore, the communication equipment controls the optical line amplifier OLA and optical preamplifier OPA to adjust the power within the band and pre-equalize the total power within the band. In the process, it synchronously records the difference in total output power between the optical line amplifier OLA and / or optical preamplifier OPA and the optical power amplifier OBA in each optical fiber span within each signal transmission multiplexing unit as ΔOTS. If the maximum value of ΔOTS is less than a first preset threshold of 0.1 dB, it is determined that the total output power of the optical line amplifier OLA and / or optical preamplifier OPA and the optical power amplifier OBA in each band of the optical signal satisfies the first preset condition, and the next step can be taken to control the optical power amplifier OBA to perform power adjustment operations between the S, C, and L bands of the optical signal. Otherwise, the communication equipment periodically controls the optical line amplifier OLA and optical preamplifier OPA to adjust the power within the band.

[0061] In some functional embodiments of the control method for a multiband optical transmission system of the present invention, the multiband optical signals transmitted by the multiband optical transmission system include a first band optical signal—an S-band optical signal, a second band optical signal—an L-band optical signal, and a third band optical signal—a C-band optical signal. Based on this, the above-described step of "controlling the optical power amplifier to adjust the power between bands" may include the steps of controlling the optical power amplifier to increase the first output power of the first band optical signal and decrease the second output power of the second band optical signal, and controlling the optical power amplifier to adjust the third output power of the third band optical signal based on the adjustment amounts of the first and second output powers.

[0062] In this embodiment, when the communication device controls the optical power amplifier OBA to adjust the output power between each band of the optical signal, it can control the optical power amplifier OBA to increase the first output power of the first band optical signal—the S-band optical signal—and simultaneously decrease the second output power of the second band optical signal—the L-band optical signal. Furthermore, the communication device controls the optical power amplifier OBA to adjust the third output power of the third band optical signal, i.e., the C-band optical signal, according to the adjustment amount of the first and second output powers, thereby preventing the total output power between each band of the optical signal from changing.

[0063] In this embodiment, when a communication device controls an optical power amplifier (OBA) to adjust the output power between each band of the optical signal, thereby equalizing the power between each band, it is necessary to control the OBA so that the total input power of the multiband optical signal remains constant before and after power adjustment in order to converge the power adjustment strategy. Thus, when the multiband optical signal includes a first band optical signal (S-band optical signal), a second band optical signal (L-band optical signal), and a third band optical signal (C-band optical signal), the communication device can control the OBA to increase the output power of the S-band and decrease the output power of the L-band. However, the amount of adjustment for the C-band needs to be adjusted in accordance with the amount of adjustment for the output power of the S-band and L-band so that the total output power of the OBA for the optical signal does not change. Since the influence of the C-band on the overall signal is relatively small, the amount of adjustment for the C-band is adjusted in accordance with the S+L bands.

[0064] Furthermore, in some other viable embodiments of the control method for a multiband optical transmission system of the present invention, the communication equipment can control an optical power amplifier to equalize the power between each band of the multiband optical signal and adjust the output power of the first band optical signal—the S-band optical signal, the second band optical signal—the L-band optical signal, and the third band optical signal—the C-band optical signal, with the only requirement being to minimize the power difference between the three bands. Based on this, the control method for a multiband optical transmission system of the present invention may further include the steps of: continuously monitoring the total output power of the multiband optical signal from the optical power amplifier in the process of controlling the optical power amplifier to adjust the power between bands; monitoring the power difference between the first output power, the second output power, and the third output power if the total output power of the multiband optical signal from the optical power amplifier is constant; and determining that the output power between each band satisfies a second preset condition if the power difference is less than a second preset threshold.

[0065] In this embodiment, when the communication device controls the optical power amplifier OBA to adjust the output power between each band of the optical signal, the communication device can also continuously monitor the total output power of the optical power amplifier OBA transmitting for different bands of the multiband optical signal. Therefore, if the optical power amplifier OBA maintains that the total output power does not change, the communication device continuously monitors the power differences between the first band optical signal (first output power for the S-band optical signal), the second band optical signal (second output power for the L-band optical signal), and the third band optical signal (third output power for the C-band optical signal) from the optical power amplifier OBA and detects whether the maximum value of these power differences is less than a preset second threshold. Thus, if the maximum value is less than the second preset threshold, and it is determined that all power differences are less than the second preset threshold, the communication device controls the optical power amplifier OBA to adjust the output power between each band of the optical signal, and then determines that the current output power between the bands satisfies the second preset condition.

[0066] In this embodiment, the second preset threshold may specifically be 0.1 dB. In different feasible embodiments, based on different design requirements in actual use, the specific value of the second preset threshold may, of course, be other values ​​such as 0.2 dB, 0.3 dB, or 0.5 dB. In other words, it should be understood that the control method for the multiband optical transmission system of this application does not limit the specific value of the second preset threshold.

[0067] TIFF2026522326000004.tif42170

[0068]

number

[0069] TIFF2026522326000006.tif41170

[0070] TIFF2026522326000007.tif36170

[0071]

number

[0072] TIFF2026522326000009.tif25170

[0073] Furthermore, in order to maintain a constant total input power of the multiband optical signal before and after power adjustment by the optical power amplifier OBA, the communication equipment needs to calculate the correction amount δi for each span of the S / C / L bands using the following formula.

[0074]

number

[0075] Here, db2pow and pow2db represent the conversion from dB units to linear mW units and the conversion from linear mW units to dB units, respectively.

[0076] From the above, it can be seen that the adjustment amounts ΔPInter-band required for the S-band, C-band, and L-band spans are ΔPS+δi / 3, ΔPC+δi / 3, and ΔPL+δi / 3, respectively. Therefore, the communication equipment can adjust the output power of the C-band optical signal by controlling the optical power amplifier OBA according to ΔPC+δi / 3 in the adjustment amount ΔPInter-band.

[0077] In some executable embodiments of the control method for a multiband optical transmission system of the present invention, the step of "controlling the optical power amplifier, the optical line amplifier, and the optical preamplifier to adjust the power slope of each band" may include the steps of determining the amount of adjustment of the band slope for each band based on the channel-level output power spectrum of the optical preamplifier located at the end of the optical signal transmission multiplexer, and controlling the optical power amplifier, the optical line amplifier, and the optical preamplifier to adjust the power slope within each band according to the respective amount of adjustment of the band slope.

[0078] In this embodiment, when the communication device controls the optical power amplifier OBA together with the optical line amplifier OLA and the optical preamplifier OPA to adjust the power slope within each band of the optical signal, first, it calculates and determines the amount of adjustment for each band slope of the optical signal based on the channel-level output power spectrum of the optical preamplifier OPA located at the end of the optical signal transmission multiplexing section, and then controls the optical power amplifier OBA, the optical line amplifier OLA and the optical preamplifier OPA to adjust the power slope within each band according to the determined amount of adjustment for each band slope.

[0079] In some executable embodiments of the control method for a multiband optical transmission system of the present invention, the step of "determining the amount of adjustment for the band slope of each band based on the channel-level output power spectrum of the optical preamplifier at the end of the optical signal transmission multiplexer" may include the steps of: measuring the channel-level output power spectrum of the optical preamplifier at the end of the optical signal transmission multiplexer using an optical performance monitor; fitting and determining the band slope of each band of the optical signal based on the channel-level output power spectrum; and calculating the amount of adjustment for the band slope of each band based on each of the band slopes.

[0080] In this embodiment, the communication equipment measures the channel-level output power spectrum of the optical preamplifier OPA located at the end of the optical signal transmission multiplexing section via optical performance monitors OPMs positioned at the beginning and end of the optical signal transmission multiplexing section. Based on the channel-level output power spectrum, it fits and determines the band slopes of the optical signal bands S, L, and C. Furthermore, based on the band slopes of the optical signal bands S, L, and C, it calculates and determines the adjustment amounts for the band slopes of the optical signal bands S, L, and C.

[0081] TIFF2026522326000011.tif45170

[0082] In some executable embodiments of the control method for a multiband optical transmission system of the present invention, the step of "controlling the optical power amplifier, the optical line amplifier, and the optical preamplifier to adjust the power slope in each band according to the adjustment amount of each band slope" may include the steps of determining the respective slope adjustment ratios of the optical power amplifier, the optical line amplifier, and the optical preamplifier based on the adjustment amount of the band slope, and controlling the optical power amplifier, the optical line amplifier, and the optical preamplifier to adjust the power slope in each band according to the respective band slope adjustment ratios.

[0083] In this embodiment, the communication device can determine the adjustment amount for the S-band, L-band, and C-band band slopes in the optical signal based on the above calculation, and then determine the respective slope adjustment ratios for the optical power amplifier OBA, optical line amplifier OLA, and optical preamplifier OPA based on the adjustment amount for each band slope. As a result, the communication device can control the optical power amplifier OBA, the optical line amplifier OLA, and the optical preamplifier OPA to adjust the power slopes within the S-band, L-band, and C-band according to their respective slope adjustment ratios.

[0084] TIFF2026522326000012.tif60170

[0085] Here, the specific value of γ may be 1 / 2. In different feasible embodiments based on different design requirements in actual use, the value of γ may of course be other values, that is, it should be understood that the control method for the multiband optical transmission system of this application does not particularly limit the value of γ.

[0086] In some executable embodiments of the control method for a multiband optical transmission system of the present invention, after the communication equipment has performed the above-described step of "controlling the optical power amplifier, the optical line amplifier, and the optical preamplifier to adjust the power slope in each band according to the adjustment amount of each band slope", the control method for a multiband optical transmission system of the present invention If a third preset condition is not met, the procedure further includes repeatedly performing the operations of controlling the optical power amplifier to adjust the power between each band, and controlling the optical power amplifier, the optical line amplifier, and the optical preamplifier to adjust the power slope within each band, wherein the third preset condition is that the amount of output power adjustment between bands is less than a third preset threshold, and the amount of band slope adjustment for each band is less than a fourth preset threshold.

[0087] In this embodiment, the communication equipment controls the optical power amplifier OBA to adjust the output power between each band of the multiband optical signal, and controls the optical power amplifier OBA, optical line amplifier OLA, and optical preamplifier OPA to adjust the power slope of each band of the multiband optical signal. After the optical power amplifier OBA has performed power adjustment, it continuously monitors whether the output power adjustment amount ΔPInter-band between each band of the multiband optical signal is less than a third preset threshold, and controls the optical power amplifier OBA, optical line amplifier OLA, and optical preamplifier OPA. When controlling A to adjust the power slope of each band of the multiband optical signal, the system monitors whether the band slope adjustment amount ΔPtilt is less than a fourth preset threshold. If the output power adjustment amount ΔPInter-band between each band is less than a third preset threshold, and the band slope adjustment amount ΔPtilt for each band is less than a fourth preset threshold, the system controls the optical power amplifier OBA, the optical line amplifier OLA, and the optical preamplifier OPA to determine that the power adjustment currently being performed jointly satisfies the third preset condition.

[0088] Conversely, if the communication equipment monitors that the output power adjustment amount ΔPInter-band between each band is greater than or equal to a third preset threshold, or that the band slope adjustment amount ΔPtilt for each band is greater than or equal to a fourth preset threshold, it determines that the power adjustment currently being performed jointly does not meet the third preset condition. The communication equipment then repeatedly performs the operations described above: "controlling the optical power amplifier to adjust the power between each band" and "controlling the optical power amplifier, the optical line amplifier, and the optical preamplifier to adjust the power slope within each band," until it determines through monitoring that the power adjustment currently being performed jointly meets the third preset condition.

[0089] In this embodiment, the third preset threshold and the fourth preset threshold may specifically be 0.1 dB. Similarly, in different feasible embodiments based on different design requirements in actual use, the specific values ​​of the third preset threshold and the fourth preset threshold may, of course, be other values. In other words, it should be understood that the control method for the multiband optical transmission system of this application does not limit the specific values ​​of the third preset threshold and the fourth preset threshold, respectively.

[0090] In some feasible embodiments of the control method for a multiband optical transmission system of the present invention, if a communication device determines through monitoring that the power adjustment currently being performed jointly satisfies a third preset condition, the control method for a multiband optical transmission system of the present invention may further include the steps of: determining a target output power spectrum based on the actual output power spectrum of the optical signal transmission multiplexer; determining the channel-level power uniformity of the optical signal transmission multiplexer; determining the maximum nonlinear cost of the multiband optical transmission system based on the channel-level power uniformity; and determining and outputting the optical signal input power of the multiband optical transmission system if the maximum nonlinear cost satisfies a preset nonlinear effect condition.

[0091] In this embodiment, the communication equipment monitors whether the output power adjustment amount between each band of the multiband optical signal is less than the third preset threshold and whether the band slope adjustment amount for each band is less than the fourth preset threshold, and controls the optical power amplifier OBA, optical line amplifier OLA, and optical preamplifier OPA. If it determines that the power adjustment currently being performed jointly satisfies the third preset condition, it determines the target output power spectrum based on the actual output power spectrum of the optical signal transmission multiplexer after joint power adjustment. Furthermore, the communication equipment determines the channel-level power uniformity amount of the optical signal transmission multiplexer and, based on the channel-level power uniformity amount, determines the maximum nonlinear cost of the currently controlled multiband optical transmission system. If the maximum nonlinear cost satisfies the preset nonlinear effect condition, it determines and outputs the optical signal input power of the multiband optical transmission system.

[0092] In this embodiment, the above-described preset nonlinear effect conditions include the maximum nonlinear cost being less than a fifth preset threshold, the filtering cost for optical signal transmission being less than a sixth preset threshold, and the worst-case optical signal-to-noise ratio margins for each band being equal and greater than or equal to a seventh preset threshold. Here, the fifth and sixth preset thresholds are the same and may both be set to 0.1 dB, while the seventh preset threshold may specifically be set to 2 dB. In different feasible embodiments based on different design requirements in actual use, the specific values ​​of the fifth, sixth, and seventh preset thresholds may, of course, be other values, that is, the control method for the multiband optical transmission system of this application does not particularly limit the specific values ​​of the fifth, sixth, and seventh preset thresholds.

[0093] For example, as shown in Figure 4, if the communication equipment controls the optical power amplifier OBA to adjust the output power between each band of the multiband optical signal, and the maximum value of the output power adjustment amount ΔPInter-band for adjusting the output power of each band is less than a third preset threshold of 0.1 dB, and the communication equipment controls the optical power amplifier OBA, optical line amplifier, and optical preamplifier OPA to adjust the power slope within each band of the optical signal, and the maximum value of the band slope adjustment amount ΔPtilt for each band is also less than a fourth preset threshold of 0.1 dB, then it means that after the optical power amplifier OBA, optical line amplifier, and optical preamplifier OPA jointly adjust the power of the optical signal, the total power between bands is uniform, and the slopes within each band are also evenly allocated to each span according to the span.

[0094] However, if the maximum value of the output power adjustment amount ΔPInter-band is determined to be greater than or equal to the third preset threshold of 0.1 dB, or if the maximum value of the band slope adjustment amount ΔPtilt is greater than or equal to the fourth preset threshold of 0.1 dB, the communication equipment must return to the operation of "controlling and adjusting the optical line amplifier and the optical preamplifier" described above and continue a new round of the joint band-level power adjustment cycle of the optical signal transmission multiplexing unit; otherwise, it proceeds to the next step, "channel-level power equalization".

[0095] However, while performing the "channel-level power equalization" operation, the communication equipment monitors the actual output power spectrum of the entire optical signal transmission multiplexer via optical performance monitors (OPMs) located at the beginning and end of the optical signal transmission multiplexer, and calculates the target output power spectrum based on the fitted slope of the actual output power spectrum, without changing the total power of the optical signal transmission multiplexer. Therefore, the communication equipment can obtain the amount of channel-level power equalization for the entire optical signal transmission multiplexer (i.e., the channel-level attenuation ΔPOCH of the band selection switch WSS at the optical cross-connect site) by dividing the difference between the target output power spectrum and the actual output power by α (where α is 1 / 2 and represents the ratio of system non-uniformity shared by the transmitting and receiving ends).

[0096] In some functional embodiments of the control method for a multiband optical transmission system of the present invention, the communication equipment specifically inputs a channel-level power uniformity amount calculated based on the target output power spectrum and actual output power, after the input power spectrum has been formed following optimization of the power co-adjustment of the current optical signal transmission multiplexer, into an extended Gaussian noise EGN model to evaluate the maximum nonlinear cost (which is generally located in the S-band short wavelength in an S+C+L optical signal transmission system), and determines whether the above nonlinear effect conditions are met based on the value of the maximum nonlinear cost.

[0097] Therefore, if, by comparison, the value of the maximum nonlinear cost is less than the fifth preset threshold of 0.1 dB, and similarly, the value of the filtering cost for optical signal transmission of the entire multiband optical signal transmission system obtained by evaluation using the extended Gaussian noise EGN model is less than the sixth preset threshold of 0.1 dB, and the worst-case optical signal-to-noise ratio OSNR margin in the S / L / C bands is equal and greater than or equal to the seventh preset threshold of 2 dB, the communication equipment controls the optical power amplifier OBA, line amplifier OLA, and optical preamplifier OPA in the current optical signal transmission multiplexer to jointly adjust the power, and then determines and outputs the final power adjustment amount for each device in the entire system and the optical signal input power, by determining that the maximum nonlinear cost of the entire optical signal transmission multiplexer satisfies the nonlinear effect condition, that is, the overall performance of the multiband optical signal transmission system has been optimized with the input power of the optical signal transmission multiplexer after the current adjustment.

[0098] In some other viable embodiments of the control method for a multiband optical transmission system of the present invention, after the step of "determining the maximum nonlinear cost of the multiband optical transmission system in accordance with the amount of uniform power at the channel level" as described above, the control method for a multiband optical transmission system of the present invention may further include the step of repeatedly controlling a plurality of the power adjustment points to jointly adjust the power within the band and the power between bands until the maximum nonlinear cost does not satisfy the nonlinear effect condition.

[0099] In this embodiment, if the communication device, after calculating and determining the maximum nonlinear cost of the multiband optical transmission system currently being controlled by the above process, detects that the maximum nonlinear cost still does not satisfy the above nonlinear effect conditions, the communication device must continue to perform the operation of "controlling the multiple power adjustment points to jointly adjust the power within the band and the power between bands" until the maximum nonlinear cost satisfies the nonlinear effect conditions, and then determine and output the optical signal input power of the multiband optical transmission system.

[0100] For example, as shown in Figure 4, the communication equipment calculates the channel-level power uniformity amount determined based on the target output power spectrum and actual output power, inputs it into an extended Gaussian noise EGN model to evaluate the maximum nonlinear cost, and then, by comparison, the value of the maximum nonlinear cost is greater than or equal to a fifth preset threshold of 0.1 dB, or the value of the filtering cost for optical signal transmission of the entire multiband optical signal transmission system, obtained by evaluation by the extended Gaussian noise EGN model, is greater than or equal to a sixth preset threshold of 0.1 dB, or the worst-case optical signal-to-noise ratio (OSNR) margins in each band of the optical signal S / L / C are equal, and a seventh preset threshold If the difference is less than 2 dB, the communication device controls the optical power amplifier OBA, line amplifier OLA, and optical preamplifier OPA of the current optical signal transmission multiplexing unit to jointly adjust the power, and then determines that the maximum nonlinear cost of the entire optical signal transmission multiplexing unit does not satisfy the nonlinear effect condition. Thus, the communication device determines that it is necessary to further adjust the single-wavelength input power of the optical power amplifier OBA for each band of the optical signal, and so it repeats the iterative process of "controlling multiple power adjustment points to jointly adjust the power within a band and the power between bands" until it determines that the maximum nonlinear cost of the entire optical signal transmission multiplexing unit satisfies the nonlinear effect condition.

[0101] In this embodiment, the control method for the multiband optical transmission system of the present invention determines the amount of channel-level power uniformity of the optical signal transmission multiplexer using communication equipment, determines the maximum nonlinear cost of the multiband optical transmission system based on the amount of channel-level power uniformity, determines and outputs the optical signal input power of the multiband optical transmission system when the maximum nonlinear cost satisfies a preset nonlinear effect condition, and if the maximum nonlinear cost does not satisfy the nonlinear effect condition, the control method repeatedly controls multiple power adjustment points to jointly adjust the power within the band and the power between bands until the maximum nonlinear cost satisfies the nonlinear effect condition. In this way, the control method for the multiband optical transmission system of the present invention can effectively limit the nonlinear cost of the S+C+L multiband optical signal during transmission and limit the input power distribution, thereby making the maximum nonlinear cost conform to engineering standards.

[0102] Furthermore, the control method for the multiband optical transmission system of the present invention can effectively adjust the OSNR margin of each band of the S+C+L multiband signal to meet engineering standards by evaluating the transmission OSNR and cost of the worst-case wave of each band and rationally controlling the input power distribution.

[0103] In a feasible embodiment of the control method for a multiband optical transmission system of the present invention, the multiband optical signal transmission system controlled by the communication equipment is a first S+C+L band optical transmission system, and the first S+C+L band optical transmission system is specifically an 800G PCS-16QAM 183GBd 80-wave system, with the raster configured at 200GHz, the system operating bands occupying a total of 16THz of S+C+L, and it is assumed that in the multiband optical signal transmitted by the system, the S band occupies a total of 20 waves totaling 4THz, the C band occupies a total of 30 waves totaling 6THz, and the L band occupies a total of 30 waves totaling 6THz. The transmission environment is a single multiplexed section of equal span lengths (5 spans in total, N=5, G.654E optical fiber) with a single span length of 75km and a span loss of 20dB / span. The control method for the multiband optical transmission system of this invention is applied to the first S+C+L band optical transmission system, and the effect of homogenizing the channel power and the optical signal-to-noise ratio (OSNR) is shown in Figure 5.

[0104] Here, the allowable B2BOSNR of the modulation coding type of the first S+C+L band optical transmission system is 20.5 dB. This system employs multi-subcarrier multiplexing technology, i.e., the spectral width is 183 GBd, and it is composed of eight subcarriers. The average loss coefficients of the S / C / L bands in the G.654 optical fiber are 0.182 dB, 0.171 dB, and 0.173 dB, respectively. Considering the OBM cascade structure, the insertion losses in the S band, C band, and L band are 1.4 dB, 1.2 dB, and 0.8 dB, respectively. The noise figures of the optical amplifiers in the S band, C band, and L band are 8 dB, 5.5 dB, and 7 dB, respectively. The evaluation results showed that the filtering loss due to this coding type is negligibly small in the current configuration.

[0105] However, if the communication equipment controls the optical power amplifier OBA, optical line amplifier OLA, and optical preamplifier OPA within a specific optical signal transmission multiplexer of the first S+C+L band optical transmission system to jointly adjust the power within the band and the power between bands, the optical power amplifier OBA can be configured to have an initial input power of +6 dBm in the single-wavelength S / C / L band. As shown in Figure 5, after repeating the four rounds (steps 1-3) of Figure 4, it can be seen that the power flatness at the receiving end (connected to the output of the optical preamplifier OPA) is continuously optimized. However, due to the limitations of nonlinear effects, the initial input power needs to be updated, and after the initial input power is updated, steps 1-4 of Figure 4 are repeated, thereby ultimately obtaining average single-wavelength input powers of 9.45, 3.65, and 1.79 dB in the S / C / L bands, respectively. At this point, it can be seen that the maximum OSNR flatness in the S / C / L band is still less than 1 dB and the power flatness is within 1.5 dB, which is as expected.

[0106] The maximum transmission distance of the modulation code type of the S+C+L band optical transmission system on G.654 optical fiber in the S+C+L bands was engineered using communication equipment, specifically controlled so that the OSNR margins of the worst-case waves in the S / C / L bands are equal and approximately equal to 2 dB, and the system's nonlinearity and filtering cost are controlled to less than 1 dB. According to the evaluation results, on G.654E fiber, the modulation code type supports transmission over 1200 km, with average single-wavelength input powers of 9.45, 3.65, and 1.79 dB in the S / C / L bands, respectively. The Raman additional losses for the S / C / L bands were 1.94, -0.83, and -2.79, respectively. The OSNR non-flatness for the S / C / L bands was 0.35, 0.75, and 0.25 dB, respectively. The maximum nonlinear costs for the S / C / L bands were 0.94, 0.27, and 0.01 dB. At this point, the OSNR margins for the worst-case waves in the S / C / L bands were 2.1, 2.1, and 2.1 dB, respectively, indicating that the OSNR reached a uniform state.

[0107] As described above, by controlling the power within and between bands to be jointly adjusted via communication equipment, the first S+C+L system becomes capable of long-distance transmission of multiband optical signals. Furthermore, jointly adjusting the power within and between bands by controlling it via communication equipment results in faster convergence and lower overall computational complexity.

[0108] In another feasible embodiment of the control method for a multiband optical transmission system of the present invention, the transmission optical fiber of the first S+C+L band optical transmission system is replaced with a more commonly used G.652 optical fiber, thereby setting the average loss coefficients for the S / C / L bands in the G.652 optical fiber to 0.206 dB, 0.194 dB, and 0.194 dB, respectively, and changing the span loss to 22 dB, thereby forming a second S+C+L band optical transmission system without changing other conditions. The control method for a multiband optical transmission system of the present invention is then applied to this second S+C+L band optical transmission system to further optimize the system.

[0109] Similarly, for each power adjustment point in each optical signal transmission multiplexer of the second S+C+L band optical transmission system, joint adjustment of intraband power and interband power was performed using the same procedure as described above. Then, the maximum transmission distance of the modulation code type in the S+C+L band G.652 optical fiber was engineered, i.e., controlled so that the OSNR margin of the worst-case waves in the S / C / L bands is equal and equal to approximately 2 dB, and the system's nonlinearity and filtering cost are controlled to less than 1 dB. According to the evaluation results, in G.654E fiber, the modulation code type supports transmission of 1200 km, and the average single-wavelength input powers in the S / C / L bands are 8.73, 1.82, and -1.01 dB, respectively. The Raman additional losses for the S / C / L bands were 2.49, -1.19, and -1.01 dB, respectively. The OSNR non-flatness for the S / C / L bands was 0.60, 0.94, and 0.60 dB, respectively. The maximum nonlinear costs for the S / C / L bands were 1.04, 0.22, and 0.01 dB. At this point, the OSNR margins for the worst-case waves in the S / C / L bands were 2.1, 2.1, and 2.0 dB, respectively, indicating that the OSNR had reached a uniform state.

[0110] Therefore, by controlling the power within and between bands to be jointly adjusted via communication equipment, the second S+C+L system becomes capable of long-distance transmission of multiband optical signals. In other words, the control method for the multiband optical transmission system of the present invention can cover most network scenarios in the S+C+L bands.

[0111] Furthermore, embodiments of the present application provide communication equipment. The communication equipment includes a control device, memory, processor, and a computer program stored in the memory and executable on the processor for the multiband optical transmission system described above, wherein the computer program is configured to implement steps of the control method for the multiband optical transmission system described above.

[0112] Furthermore, embodiments of the present invention provide a computer-readable storage medium. A computer program is stored in the storage medium, and when the computer program is executed by a processor, the steps of the control method for the multiband optical transmission system described above are realized.

[0113] In this specification, the terms “includes,” “contains,” or other variations thereof are intended to cover non-exclusive inclusion, and a process, method, article, or system containing a set of elements includes not only those elements but also other elements not expressly listed, or elements specific to such process, method, article, or system. Without further limitation, an element defined by the statement “includes one…” does not preclude the presence of additional identical elements in a process, method, article, or system containing that element.

[0114] Through the above description of the embodiments, those skilled in the art will clearly understand that the methods of the embodiments may be implemented by software and a necessary general hardware platform, or by hardware alone, and that in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present application can essentially implement the part that contributes to the prior art in the form of a software product, which is stored in the above-mentioned storage medium (e.g., ROM / RAM, disk, optical disk) and includes several instructions for causing a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to perform the method of each embodiment of the present application.

[0115] The foregoing are merely preferred embodiments of the present application and do not limit the scope of the patent. Equivalent structural or process transformations, or direct or indirect applications in other related technical fields, using the contents of the specification and drawings of the present application are all included within the scope of the patent protection of the present application.

Claims

1. A method for controlling a multiband optical transmission system, A step of determining multiple power adjustment points in the optical signal transmission multiplexing section of a multiband optical transmission system, A method for controlling a multiband optical transmission system, comprising the step of controlling a plurality of power adjustment points to jointly adjust the power within a band and the power between bands, thereby maintaining a uniform optical transmission power within the multiband optical transmission system.

2. The power adjustment point includes an optical power amplifier, an optical line amplifier, and an optical preamplifier. The step of controlling multiple power adjustment points to jointly adjust the power within a band and the power between bands is: The steps include controlling and adjusting the optical line amplifier and the optical preamplifier until the total output power of the optical line amplifier, the optical preamplifier, and the optical power amplifier within each band satisfies a first preset condition, After the total output power satisfies a first preset condition, the optical power amplifier is controlled to adjust the power between each band so that the output power between each band satisfies a second preset condition. A control method for a multiband optical transmission system according to claim 1, comprising the steps of adjusting the power between each of the aforementioned bands, and then controlling the optical power amplifier, the optical line amplifier, and the optical preamplifier to adjust the power slope within each band.

3. The aforementioned method, A control method for a multiband optical transmission system according to claim 2, further comprising the step of repeatedly performing an operation to control and adjust the optical line amplifier and the optical preamplifier if the total output power does not satisfy a first preset condition.

4. The aforementioned method, The process further includes the step of determining that the total output power satisfies the first predetermined condition if the difference between the first total output power and the difference between the second total output power is less than a first predetermined threshold, The control method for a multiband optical transmission system according to claim 2 or 3, wherein the first difference in total output power is the difference in total output power between the adjusted optical line amplifier and the optical power amplifier, and the second difference in total output power is the difference in total output power between the adjusted optical preamplifier and the optical power amplifier.

5. The multiband optical signal transmitted by the multiband optical transmission system includes a first band optical signal, a second band optical signal, and a third band optical signal. The step of controlling the optical power amplifier to adjust the interband power is, The steps include controlling the optical power amplifier to increase the first output power of the first band optical signal and decrease the second output power of the second band optical signal, A method for controlling a multiband optical transmission system according to claim 2, comprising the step of controlling the optical power amplifier to adjust the third output power of the third band optical signal based on the adjustment amounts of the first output power and the second output power.

6. The aforementioned method, The process of controlling the optical power amplifier to adjust the interband power includes the step of continuously monitoring the total output power of the multiband optical signal from the optical power amplifier, When the total output power of the multiband optical signal from the optical power amplifier is constant, the step of monitoring the power difference between the first output power, the second output power, and the third output power, A method for controlling a multiband optical transmission system according to claim 5, comprising the step of determining that the output power between each band satisfies a second preset condition if the power difference is less than a second preset threshold.

7. The step of controlling the optical power amplifier, the optical line amplifier, and the optical preamplifier to adjust the power slope within each band is: The steps include determining the amount of adjustment for the band slope of each band based on the output power spectrum of the channel level of the optical preamplifier located at the end of the optical signal transmission multiplexing unit, A control method for a multiband optical transmission system according to claim 2, comprising the step of controlling the optical power amplifier, the optical line amplifier, and the optical preamplifier to adjust the power slope in each band according to the adjustment amount of each band slope.

8. The step of determining the amount of adjustment for the band slope of each band based on the output power spectrum of the channel level of the optical preamplifier located at the end of the optical signal transmission multiplexing unit is as follows: The steps include: measuring the channel-level output power spectrum of the optical preamplifier at the end of the optical signal transmission multiplexing unit using an optical performance monitor; The steps include: fitting the output power spectrum of the channel level to determine the band slope of each band of the optical signal; A control method for a multiband optical transmission system according to claim 7, comprising the step of calculating the amount of adjustment for the band slope of each band based on each of the band slopes.

9. The step of controlling the optical power amplifier, the optical line amplifier, and the optical preamplifier to adjust the power slope within each band according to the adjustment amount of each band slope is: The steps include determining the slope adjustment ratio for each of the optical power amplifier, the optical line amplifier, and the optical preamplifier based on the adjustment amount of the band slope, A method for controlling a multiband optical transmission system according to claim 7, comprising the steps of controlling the optical power amplifier, the optical line amplifier, and the optical preamplifier to adjust the power slope in each band according to the respective band slope adjustment ratios.

10. After the step of controlling the optical power amplifier, the optical line amplifier, and the optical preamplifier to adjust the power slope within each band according to the adjustment amount of each band slope, the method then: A method for controlling a multiband optical transmission system according to claim 7, further comprising the steps of repeatedly performing an operation to control the optical power amplifier to adjust the power between each band, and an operation to control the optical power amplifier, the optical line amplifier, and the optical preamplifier to adjust the power slope within each band, wherein the third preset condition is that the amount of output power adjustment between each band is less than a third preset threshold, and the amount of band slope adjustment for each band is less than a fourth preset threshold.

11. If the third predetermined condition is met, the method proceeds as follows: The steps include determining the target output power spectrum based on the actual output power spectrum of the optical signal transmission multiplexing unit and determining the channel level power uniformity amount of the optical signal transmission multiplexing unit, The steps include determining the maximum nonlinear cost of the multiband optical transmission system based on the channel-level power uniformity, A method for controlling a multiband optical transmission system according to claim 10, further comprising the step of determining and outputting the optical signal input power of the multiband optical transmission system when the maximum nonlinear cost satisfies a preset nonlinear effect condition.

12. After the step of determining the maximum nonlinear cost of the multiband optical transmission system based on the channel-level power uniformity, the method: A method for controlling a multiband optical transmission system according to claim 11, further comprising the step of performing an operation to jointly adjust the power within a band and the power between bands by repeatedly controlling a plurality of power adjustment points until the maximum nonlinear cost satisfies the nonlinear effect condition, if the maximum nonlinear cost does not satisfy the nonlinear effect condition.

13. A method for controlling a multiband optical transmission system according to claim 11 or 12, wherein the preset nonlinear effect conditions include the value of the maximum nonlinear cost being less than a fifth preset threshold, the value of the filtering cost for optical signal transmission being less than a sixth preset threshold, and the worst-case optical signal-to-noise ratio margins in each band being equal and greater than or equal to a seventh preset threshold.

14. A communication device comprising memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement steps of a method for controlling a multiband optical transmission system according to any one of claims 1 to 13.

15. A computer-readable storage medium in which a computer program is stored, wherein when the computer program is executed by a processor, a step of the control method for a multiband optical transmission system according to any one of claims 1 to 13 is realized.

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