Control method of multiband optical transmission system, communication device and storage medium

Abstract

The present application belongs to the technical field of optical network communication. Disclosed are a control method of a multiband optical transmission system, a communication device and a storage medium. The control method of the multiband optical transmission system comprises: determining a plurality of power adjustment points in an optical signal transmission multiplexing section of the multiband optical transmission system; and controlling the plurality of power adjustment points to perform joint adjustment on intra-band power and inter-band power, such that the optical transmission power of the multiband optical transmission system is in an equalization state.

Description

Control method, communication device and storage medium of multi-band optical transmission system

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202310801200.6 filed on June 30, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of optical communication technology, and in particular to a control method, communication equipment, and computer-readable storage medium for a multi-band optical transmission system. Background Art

[0004] In the field of optical communications, the Stimulated Raman Scattering (SRS) effect is a key factor affecting the performance of broadband multi-band optical transmission systems. This effect causes power shift from short wavelengths to long wavelengths, resulting in power unevenness in the Raman gain spectrum, reaching approximately 100 nm. This can lead to the entire broadband multi-band optical transmission system being unable to support long-distance optical signal transmission. Furthermore, in some cases, broadband multi-band optical transmission systems incur significant nonlinear penalties when transmitting optical signals at high power. This nonlinear effect of the optical transmission system is also a significant factor limiting the system's transmission distance.

[0005] Summary of the Invention

[0006] The main purpose of this application is to provide a control method, communication equipment and computer-readable storage medium for a multi-band optical transmission system.

[0007] To achieve the above-mentioned objectives, an embodiment of the present application provides a control method for a multi-band optical transmission system, the method comprising: determining multiple power adjustment points in an optical signal transmission multiplexing segment of the multi-band optical transmission system; and controlling the multiple power adjustment points to perform joint adjustment of intra-band power and inter-band power so that the optical transmission power of the multi-band optical transmission system is in a balanced state.

[0008] In addition, an embodiment of the present application also provides a communication device, which includes: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the computer program is configured to implement the steps of the control method for the multi-band optical transmission system as described above.

[0009] In addition, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the control method of the multi-band optical transmission system described above are implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG1 is a schematic diagram of the structure of the operating equipment of the hardware operating environment involved in the embodiment of the present application;

[0011] FIG2 is a schematic diagram of a step flow diagram of an embodiment of a method for controlling a multi-band optical transmission system according to an embodiment of the present application;

[0012] FIG3 is a schematic diagram of power adjustment points involved in an embodiment of a control method for a multi-band optical transmission system provided in an embodiment of the present application;

[0013] FIG4 is a schematic diagram of a power regulation application process involved in an embodiment of a control method for a multi-band optical transmission system provided in an embodiment of the present application;

[0014] FIG5 is a schematic diagram of the equalization effect of the power regulation receiving end involved in an embodiment of the control method of the multi-band optical transmission system provided in the embodiment of the present application.

[0015] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0016] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0017] Refer to Figure 1, which is a schematic diagram of the operating equipment structure of the hardware operating environment involved in the embodiment of the present application.

[0018] In this embodiment, the operating device of the hardware operating environment involved in the embodiment of the present application can be a communication device integrated in the multi-band optical transmission system or first connected to the multi-band optical transmission system, so that it can effectively control the multi-band optical transmission system. The communication device can be a terminal such as a smart phone, PC, or tablet.

[0019] As shown in Figure 1, the operating device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and optionally the user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (WI-FI) interface). The memory 1005 may be a high-speed random access memory (RAM) memory, or a stable non-volatile memory (NVM), such as a disk memory. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0020] Those skilled in the art will understand that the structure shown in FIG1 does not constitute a limitation on the operating device, and may include more or fewer components than shown, or a combination of certain components, or a different arrangement of components.

[0021] As shown in FIG. 1 , the memory 1005 as a storage medium may include an operating system, a data storage module, a network communication module, a user interface module, and a computer program.

[0022] In the operating device shown in Figure 1, the network interface 1004 is mainly used for data communication with other devices; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the operating device of the present application can be set in the operating device, and the operating device calls the computer program stored in the memory 1005 through the processor 1001, and performs the following operations: determining multiple power adjustment points in the optical signal transmission multiplexing segment of the multi-band optical transmission system; controlling the multiple power adjustment points to perform joint adjustment of the intra-band power and the inter-band power, so that the optical transmission power of the multi-band optical transmission system is in a balanced state.

[0023] Exemplarily, the power adjustment points include an optical power amplifier, a line optical amplifier, and a pre-optical amplifier.

[0024] The processor 1001 can call a computer program stored in the memory 1005 and further perform the following operations: controlling the line optical amplifier and the pre-optical amplifier to perform adjustment until the total output power of the line optical amplifier, the pre-optical amplifier, and the optical power amplifier in each band meets a first preset condition; after the total output power meets the first preset condition, controlling the optical power amplifier to adjust the power between the bands so that the output power between the bands meets a second preset condition; after the power between the bands is adjusted, controlling the optical power amplifier, the line optical amplifier, and the pre-optical amplifier to adjust the power slope within each band.

[0025] Exemplarily, the processor 1001 may call a computer program stored in the memory 1005 and further perform the following operations: when the total output power does not meet the first preset condition, iteratively execute an operation of controlling the line optical amplifier and the pre-optical amplifier to perform adjustments.

[0026] Exemplarily, the processor 1001 may invoke a computer program stored in the memory 1005 to further perform the following operations: when the difference between the first total output power and the difference between the second total output power is less than a first preset threshold, determining that the total output power satisfies the first preset condition. The first total output power difference is the difference in total output power between the adjusted line optical amplifier and the optical power amplifier. The second total output power difference is the difference in total output power between the adjusted pre-optical amplifier and the optical power amplifier.

[0027] 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.

[0028] The processor 1001 can call the computer program stored in the memory 1005 and further perform the following operations: control the optical power amplifier to increase the first output power of the first-band optical signal and reduce the second output power of the second-band optical signal; and control the optical power amplifier to adjust the third output power of the third-band optical signal according to the adjustment amount of the first output power and the second output power.

[0029] Exemplarily, the processor 1001 may call a computer program stored in the memory 1005 and further perform the following operations: while controlling the optical power amplifier to adjust the inter-band power, continuously monitor the total output power of the optical power amplifier for the multi-band optical signal; when the total output power of the optical power amplifier for the multi-band optical signal is in a constant state, monitor the power difference between the first output power, the second output power, and the third output power; and when the power difference is less than a second preset threshold, determine that the output power between the bands meets a second preset condition.

[0030] Exemplarily, the processor 1001 can call the computer program stored in the memory 1005 and further perform the following operations: determine the band slope adjustment amount of each band based on the channel-level output power spectrum of the pre-optical amplifier at the tail end of the optical signal transmission multiplexing section; control the optical power amplifier, the line optical amplifier and the pre-optical amplifier to adjust the power slope in each band according to each of the band slope adjustment amounts.

[0031] Exemplarily, the processor 1001 may call a computer program stored in the memory 1005 and further perform the following operations: measuring the channel-level output power spectrum of the optical preamplifier at the tail end of the optical signal transmission multiplexing section through an optical performance monitor; determining the band slope of each band of the optical signal based on the channel-level output power spectrum fitting; and calculating the band slope adjustment amount of each band based on each of the band slopes.

[0032] Exemplarily, the processor 1001 can call a computer program stored in the memory 1005 and further perform the following operations: determine the slope adjustment ratios of the optical power amplifier, the line optical amplifier, and the pre-optical amplifier through the band slope adjustment amount; control the optical power amplifier, the line optical amplifier, and the pre-optical amplifier to adjust the power slopes in each band according to their respective slope adjustment ratios.

[0033] Exemplarily, the processor 1001 may invoke a computer program stored in the memory 1005 to, after executing the control of the optical power amplifier, the line optical amplifier, and the pre-optical amplifier to adjust the power slope within each band according to each band slope adjustment amount, further perform the following operations: if a third preset condition is not met, iteratively execute the operations of controlling the optical power amplifier to adjust the power between the bands and controlling the optical power amplifier, the line optical amplifier, and the pre-optical amplifier to adjust the power slope within each band. The third preset condition is that the output power adjustment amount between the bands is less than a third preset threshold, and the band slope adjustment amount of each band is less than a fourth preset threshold.

[0034] Exemplarily, when the third preset condition is met, the processor 1001 can call the computer program stored in the memory 1005 and perform the following operations: determine the target output power spectrum based on the actual output power spectrum of the optical signal transmission multiplexing section, and determine the channel-level power balancing amount of the optical signal transmission multiplexing section; determine the maximum nonlinear cost of the multi-band optical transmission system based on the channel-level power balancing amount; when the maximum nonlinear cost meets the preset nonlinear effect condition, determine and output the optical signal input fiber power of the multi-band optical transmission system.

[0035] Exemplarily, the processor 1001 can call a computer program stored in the memory 1005, and after determining the maximum nonlinear cost of the multi-band optical transmission system based on the channel-level power balancing amount, further perform the following operations: when the maximum nonlinear cost does not meet the nonlinear effect condition, iteratively control multiple power adjustment points to perform a joint adjustment operation of intra-band power and inter-band power until the maximum nonlinear cost meets the nonlinear effect condition.

[0036] Exemplarily, the preset nonlinear effect conditions include: 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 net margin of the optical signal-to-noise ratio of the worst wave in each band is equal to and greater than or equal to a seventh preset threshold.

[0037] Based on the operating device structure of the hardware operating environment involved in the above-mentioned embodiment of the present application, the overall concept of the control method of the multi-band optical transmission system provided by the embodiment of the present application is first proposed.

[0038] In the field of optical communications, the Stimulated Raman Scattering (SRS) effect is a key factor affecting the performance of broadband multi-band optical transmission systems. This effect causes power shift from short wavelengths to long wavelengths, resulting in power unevenness in the Raman gain spectrum, reaching approximately 100 nm. This can lead to the entire broadband multi-band optical transmission system being unable to support long-distance optical signal transmission. Furthermore, in some cases, broadband multi-band optical transmission systems incur significant nonlinear penalties when transmitting optical signals at high power. This nonlinear effect of the optical transmission system is also a significant factor limiting the system's transmission distance.

[0039] In response to the above phenomenon, the embodiment of the present application proposes a control method for a multi-band optical transmission system, by determining multiple power adjustment points in the optical signal transmission multiplexing segment of the multi-band optical transmission system; then controlling the multiple power adjustment points to jointly adjust the intra-band power and the inter-band power, so that the optical transmission power of the multi-band optical transmission system is in a balanced state, that is, by jointly adjusting the power and power slope within the band and between the bands, the SRS effect is balanced in turn to ensure the flatness of the power and optical signal-to-noise ratio (OSNR) at the optical receiving end, thereby avoiding the power unevenness caused by the SRS effect and avoiding the nonlinear cost of over-limit in the optical transmission system, and realizing reliable transmission of multi-band, wide-spectrum, and long-distance optical transmission systems.

[0040] Based on the overall concept of the control method of the multi-band optical transmission system provided by the above-mentioned embodiment of the present application, various embodiments of the control method of the multi-band optical transmission system of the present application are proposed.

[0041] The control method for the multi-band optical transmission system of the present application is applied to the aforementioned operating device, which can be a communication device integrated into or connected to the multi-band optical transmission system. It should be understood that, based on the different design requirements of actual applications and in different feasible embodiments, the control method for the multi-band optical transmission system of the present application can of course also be applied to other terminal devices. To facilitate understanding and explanation of the technical solution, the following description of the control method for the multi-band optical transmission system of the present application uses the communication device as the executing entity of the solution.

[0042] Please refer to Figure 2, which is a flowchart illustrating the steps of a first embodiment of a method for controlling a multi-band optical transmission system of the present application. Although the flowchart illustrates a logical sequence, in certain circumstances, the method for controlling a multi-band optical transmission system of the present application may execute the steps in a different order than that shown or described herein.

[0043] As shown in FIG2 , in a first embodiment of a control method for a multi-band optical transmission system of the present application, the control method for a multi-band optical transmission system provided by the present application may include the following steps:

[0044] Step S10: determining a plurality of power adjustment points in an optical signal transmission multiplexing section of a multi-band optical transmission system.

[0045] In this embodiment, during the long-distance transmission of the multi-band optical signal by the multi-band optical transmission system, the communication device determines a plurality of power adjustment points in the optical signal transmission multiplexing section of the multi-band optical transmission system.

[0046] In this embodiment and other feasible embodiments, the multi-band optical transmission system may be an S+C+L optical transmission system for long-distance transmission of optical signals including S-band, C-band, and L-band. Specifically, the S+C+L optical transmission system may be a long-haul 800G×80λ system for use in next-generation OTN (optical transport network) networks. Furthermore, it should be understood that, based on the different design requirements of actual applications, the multi-band optical transmission system may also be other systems for transmitting optical signals including multiple bands.

[0047] For example, assuming the multi-band optical transmission system described above is a high-capacity transmission system using the spectrally efficient 800G 85GBd PCS-64QAM modulation pattern and configured with an 87.5GHz grid—a C6T+L6T+S6T optical transmission system—the single-fiber capacity of this C6T+L6T+S6T optical transmission system can support up to 800×204λ=163.2Tbit / s. As shown in Figure 3, when controlling the C6T+L6T+S6T optical transmission system for long-haul transmission of optical signals encompassing the S-band, C-band, and L-band, the communication equipment can determine the optical power amplifier (OBA), line optical amplifier (OLA), and pre-optical amplifier (OPA) in each optical signal transmission multiplexing section of the C6T+L6T+S6T optical transmission system as power adjustment points requiring band-level power adjustment.

[0048] Step S20: Control the plurality of power adjustment points to perform joint adjustment of intra-band power and inter-band power, so that the optical transmission power of the multi-band optical transmission system is in a balanced state.

[0049] In this embodiment, after determining multiple power adjustment points from the optical signal transmission multiplexing segment of the multi-band optical transmission system, the communication device controls the multiple power adjustment points to perform band-level power joint adjustment of the intra-band power and the inter-band power, so that the optical transmission power of the multi-band optical transmission system is always in a balanced state during the transmission of the multi-band optical signal.

[0050] For example, as shown in Figure 3, during the long-distance transmission of optical signals containing S-band, C-band, and L-band signals in the C6T+L6T+S6T optical transmission system, wavelength-division multiplexed signals in the S, C, and L bands pass through an optical cross-connect site to configure channel attenuation and grids for each service. After the dummy light wavelength is added to the optical cross-connect site to fully configure the entire band, the optical signal undergoes optical attenuation to adjust the total power before entering the optical signal transmission multiplexing section. At this point, the communication equipment controls and amplifies the C6T+L6T+S6T optical transmission system in the optical signal transmission multiplexing section by an optical power amplifier (OBA). The optical signal is then combined by an optical band multiplexer (OBM) and transmitted through the optical fiber link. The optical attenuation after the optical fiber is used to adjust for cross-band loss. The optical signal then passes through the optical band multiplexer (OBM) to separate the S, C, and L bands of the optical signal. The line optical amplifier (OLA) amplifies the service optical signal in each band before it is combined again by the OBM. The optical signal then circulates through N-1 optical signal transmission multiplexing section spans, then travels through the final fiber span before being split by the optical band multiplexer (OBM) and entering the receiving end's optical preamplifier (OPA) for power amplification. Finally, the optical signal's multiplexing section reaches multiple optical cross-connect sites, where they determine the direction of the S, C, and L bands. Dummy light is also dropped / blocked at these sites.

[0051] In this embodiment, the control method of the multi-band optical transmission system of the present application determines multiple power adjustment points in the optical signal transmission multiplexing section of the multi-band optical transmission system; then controls the multiple power adjustment points to jointly adjust the intra-band power and the inter-band power, so that the optical transmission power of the multi-band optical transmission system is in a balanced state, that is, by jointly adjusting the power and power slope within the band and between the bands, the SRS effect is balanced in turn to ensure the flatness of the power and optical signal-to-noise ratio OSNR at the optical receiving end, thereby avoiding the power unevenness caused by the SRS effect and avoiding the nonlinear cost of over-limit in the optical transmission system, and realizing reliable transmission of multi-band, wide-spectrum and long-distance optical transmission system.

[0052] In some feasible embodiments of the control method for a multi-band optical transmission system of the present application, the power adjustment points include an optical power amplifier (OBA), a line optical amplifier (OLA), and a pre-optical amplifier (OPA). Based on this, the above-mentioned operation of "controlling multiple power adjustment points to jointly adjust intra-band power and inter-band power" may include: controlling the line optical amplifier and the pre-optical amplifier to adjust until the total output power of the line optical amplifier, the pre-optical amplifier, and the optical power amplifier within each band meets a first preset condition; after the total output power meets the first preset condition, controlling the optical power amplifier to adjust the power between the bands so that the output power between the bands meets a second preset condition; and after adjusting the power between the bands, controlling the optical power amplifier, the line optical amplifier, and the pre-optical amplifier to adjust the power slope within each band.

[0053] In this embodiment, when controlling the optical power amplifier OBA, the line optical amplifier OLA, and the pre-optical amplifier OPA in each optical signal transmission multiplexing section of the multi-band optical transmission system to perform joint adjustment of the intra-band power and the inter-band power, the communication device may first control the line optical amplifier OLA and the pre-optical amplifier OPA to perform power adjustment until the total output power of the line optical amplifier OLA and the pre-optical amplifier OPA, respectively, with the optical power amplifier OBA in each optical signal band meets a first preset condition.

[0054] Afterwards, when the total output power of the line optical amplifier OLA and the pre-optical amplifier OPA with the optical power amplifier OBA in each band of the optical signal meets the first preset condition, the communication device can further control the optical power amplifier OBA to perform power adjustment operations between the optical signal bands, and iteratively control the optical power amplifier OBA to perform power adjustment operations between the optical signal bands until the output power between the optical signal bands meets the second preset condition.

[0055] Furthermore, after controlling the optical power amplifier (OBA) to adjust the power between the various wavelength bands of the optical signal, the communications device can also synchronously or asynchronously control the OBA, along with the aforementioned line optical amplifier (OLA) and pre-optical amplifier (OPA), to adjust the power slope within each wavelength band of the optical signal. In this way, the communications device controls the optical power amplifier (OBA), line optical amplifier (OLA), and pre-optical amplifier (OPA) in the optical signal transmission multiplex section to jointly adjust the intra-band power and inter-band power, thereby maintaining a balanced optical transmission power across the entire multi-band optical transmission system.

[0056] In some feasible embodiments of the control method of the multi-band optical transmission system of the present application, the control method of the multi-band optical transmission system of the present application may further include:

[0057] When the total output power does not meet the first preset condition, an operation of controlling the line optical amplifier and the pre-optical amplifier to perform adjustments is iteratively performed.

[0058] In this embodiment, while controlling the line optical amplifier (OLA) and the pre-optical amplifier (OPA) for power adjustment, the communications device also continuously monitors the total output power of the line optical amplifier (OLA), the pre-optical amplifier (OPA), and the optical power amplifier (OBA) within each wavelength band of the optical signal, and determines whether the total output power satisfies the first preset condition described above. Thus, after each power adjustment of the line optical amplifier (OLA) and the pre-optical amplifier (OPA), if the total output power still does not meet the first preset condition, the communications device continues to iteratively control the line optical amplifier (OLA) and the pre-optical amplifier (OPA) for power adjustment. This process of controlling the line optical amplifier (OLA) and the pre-optical amplifier (OPA) for power adjustment is repeated until the total output power meets the first preset condition.

[0059] In some feasible embodiments of the control method for a multi-band optical transmission system of the present application, the first preset condition may be: the difference in total output power between the line optical amplifier and the optical power amplifier after power adjustment is less than a first preset threshold, or the difference in total output power between the pre-optical amplifier and the optical power amplifier after power adjustment is less than a first preset threshold. Specifically, the first preset threshold may be 0.1 dB. It should be understood that, based on the different design requirements of actual applications, in different feasible embodiments, the specific value of the first preset threshold may also be other values. That is, the control method for a multi-band optical transmission system of the present application is not limited to the specific value of the first preset threshold.

[0060] Based on this, the control method of the multi-band optical transmission system of the present application may further include: when the difference between the first total output power and the second total output power is less than a first preset threshold, determining that the total output power meets the first preset condition.

[0061] In this embodiment, the first total output power difference is the difference in total output power between the line optical amplifier and the optical power amplifier after power adjustment; and the second total output power difference is the difference in total output power between the pre-optical amplifier and the optical power amplifier after power adjustment.

[0062] In this embodiment, when controlling the line optical amplifier OLA and the pre-optical amplifier OPA to perform power adjustment, the communication device continuously monitors the total output power of the line optical amplifier OLA and the pre-optical amplifier OPA, respectively, and the optical power amplifier OBA in each wavelength band of the optical signal, thereby calculating and determining the difference in total output power between the line optical amplifier and the optical power amplifier after power adjustment—a first total output power difference, and / or calculating and determining the difference in total output power between the line optical amplifier and the optical power amplifier after power adjustment—a second total output power difference.

[0063] Thereafter, the communication device compares the difference between the first total output power and / or the difference between the second total output power with the first preset threshold value, thereby determining that the total output power of the line optical amplifier OLA and / or the pre-optical amplifier OPA and the optical power amplifier OBA in each wavelength band of the optical signal meets the first preset condition only when the difference between the first total output power and / or the difference between the second total output power is less than the first preset threshold value. Conversely, if the difference between the first total output power and / or the difference between the second total output power is greater than or equal to the first preset threshold value, the communication device determines that the total output power does not meet the first preset condition.

[0064] For example, as shown in FIG4 , when the communication device controls the optical power amplifier OBA, line optical amplifier OLA and pre-optical amplifier OPA in each optical signal transmission multiplexing section of the multi-band optical transmission system to perform joint adjustment of the intra-band power and inter-band power, the single-wavelength input fiber power of the optical signal S, C and L bands in the optical power amplifier OBA is initialized to be and Afterwards, the communication device controls the line optical amplifier OLA and the pre-optical amplifier OPA to perform intra-band power adjustment to pre-equalize the total power within the band. That is, the communication device sets the gains of the subsequent line optical amplifier OLA and the pre-optical amplifier OPA so that the total output power of the line optical amplifier OLA and the pre-optical amplifier OPA is equal to the total output power of the optical power amplifier OBA, that is:

[0065] Where N is the number of fiber spans contained in a single optical signal transmission multiplex section; 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.

[0066] Furthermore, while controlling the line optical amplifier (OLA) and the pre-optical amplifier (OPA) to perform intra-band power adjustment and pre-equalize the total power within the band, the communication device simultaneously records the difference in total output power between the line optical amplifier (OLA) and / or the pre-optical amplifier (OPA) and the optical power amplifier (OBA) on each optical fiber span within each signal transmission multiplexing section as ΔOTS. When the maximum value of this ΔOTS is less than a first preset threshold of 0.1 dB, the communication device determines that the total output power of the line optical amplifier (OLA) and / or the pre-optical amplifier (OPA) and the optical power amplifier (OBA) within each optical signal band meets a first preset condition, thereby enabling the next step of controlling the optical power amplifier (OBA) to adjust the power between the S, C, and L bands of the optical signal. Otherwise, the communication device cyclically controls the line optical amplifier (OLA) and the pre-optical amplifier (OPA) to perform intra-band power adjustment.

[0067] In some feasible embodiments of the control method of the multi-band optical transmission system of the present application, the multi-band optical signal transmitted by the multi-band optical transmission system includes: 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-mentioned "controlling the optical power amplifier to adjust the power between bands" may 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; and controlling the optical power amplifier to adjust the third output power of the third-band optical signal according to the adjustment amounts of the first output power and the second output power.

[0068] In this embodiment, when controlling an optical power amplifier (OBA) to adjust the output power of optical signals across wavelength bands, the communications device may control the OBA to increase the first output power of a first-band optical signal, namely, an S-band optical signal, and simultaneously decrease the second output power of a second-band optical signal, namely, an L-band optical signal. Furthermore, the communications device may control the OBA to adjust the third output power of a third-band optical signal, namely, a C-band optical signal, based on the respective adjustment amounts of the first and second output powers, thereby maintaining the total output power of the OBA across wavelength bands.

[0069] In this embodiment, when the communication device controls the optical power amplifier OBA to adjust the output power between the various bands of the optical signal to balance the power between the various bands, in order to converge the power adjustment strategy, it is necessary to control the optical power amplifier OBA to keep the total fiber-input power of the multi-band optical signal unchanged before and after the power adjustment. In this way, the communication device can simultaneously control the optical power amplifier OBA to increase the output power of the S band and reduce the output power of the L band when the multi-band optical signal includes 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. The adjustment amount of the C band needs to be coordinated with the output power adjustment amounts of the S and L bands, so that the total output power of the optical power amplifier OBA for the optical signal remains unchanged. Because the C band has a smaller impact on the overall situation, the adjustment amount of the C band is used to coordinate with the S+L band.

[0070] In addition, in some other feasible embodiments of the control method of the multi-band optical transmission system of the present application, the communication device can also control the optical power amplifier to balance the power between the bands of the multi-band optical information, and at the same time adjust the output power of the first band optical signal - S band optical signal, the second band optical signal - L band optical signal and the third band optical signal - C band optical signal, and it is only necessary to make the power difference between the three bands as small as possible. Based on this, the control method of the multi-band optical transmission system of the present application can also include: in the process of controlling the optical power amplifier to adjust the power between bands, continuously monitoring the total output power of the multi-band optical signal of the optical power amplifier; when the total output power of the multi-band optical signal of the optical power amplifier is in a constant state, monitoring 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, determining that the output power between the bands meets the second preset condition.

[0071] In this embodiment, when controlling the optical power amplifier (OBA) to adjust the output power between optical signals in various wavelength bands, the communication device can also continuously monitor the total output power transmitted by the optical power amplifier (OBA) for each optical signal in the multi-band optical signal. Thus, while maintaining the total output power constant, the communication device continuously monitors the power differences between the first output power of the first optical signal (S-band), the second output power of the second optical signal (L-band), and the third output power of the third optical signal (C-band), and detects whether the maximum difference among these power differences is less than a second preset threshold. If the maximum difference is less than the second preset threshold, and thus it is determined that all power differences are less than the second preset threshold, the communication device determines that, after the optical power amplifier (OBA) is currently controlling the output power adjustment between the optical signals in various wavelength bands, the output power between the various wavelength bands meets the second preset condition.

[0072] In this embodiment, the second preset threshold value may also be specifically 0.1 dB. It should be understood that, based on different design requirements of actual applications, in different feasible embodiments, the specific value of the second preset threshold value may of course be other values, such as 0.2 dB, 0.3 dB, or 0.5 dB, etc. That is, the control method of the multi-band optical transmission system of the present application is not limited to the specific value of the second preset threshold value.

[0073] For example, as shown in FIG4 , when the communication device controls the optical power amplifier OBA to adjust the output power between the three bands of optical signals S, L, and C, it can specifically calculate the total power difference between the S band and the C band in the entire optical signal transmission multiplexing section, and allocate the adjustment amount to the S band and the C band according to the strategy of each taking к and (1-к) before and after the single span, so that when к is 1 / 2, the adjustment amount ΔP of the S band is S It can be expressed as:

[0074] in, and represent the total output power of the optical power amplifier OBA and the line optical amplifier OLA in the i-th fiber span in the C-band and S-band, respectively, and They represent the total input power of the optical power amplifier OBA and the total input power of the line optical amplifier OLA in the i-th fiber span in the C-band and S-band respectively.

[0075] Afterwards, the communication equipment calculates the total power difference between the L band and the C band in the entire optical signal transmission multiplexing section, and also allocates the adjustment amount to the L band and the C band according to the strategy of taking к and (1-к) before and after the single span. Therefore, when к is also taken as 1 / 2, the adjustment amount ΔP of the L band is L It can be expressed as:

[0076] in, represent the total input power of the optical power amplifier OBA and the total input power of the line optical amplifier OLA in the i-th optical fiber span of the L-band, and the total output power of the optical power amplifier OBA and the total output power of the line optical amplifier OLA in the i-th optical fiber span of the L-band, respectively.

[0077] Furthermore, in order to ensure that the total fiber-input power of the multi-band optical signal remains unchanged before and after the optical power amplifier (OBA) performs power adjustment, the communication equipment also needs to solve the correction value δi for each span of the S / C / L band using the following formula:

[0078] db2pow and pow2db represent the conversion from dB units to linear mW units and the conversion from linear mW units to dB units, respectively.

[0079] From this, we can derive the required adjustment amount ΔPInter-band for each span of the S, C, and L bands: ΔPS + δi / 3, ΔPC + δi / 3, and ΔPL + δi / 3, respectively. Therefore, the communications equipment can control the optical power amplifier (OBA) to adjust the output power of the C-band optical signal based on the ΔPC + δi / 3 portion of this adjustment amount ΔPInter-band.

[0080] In some feasible embodiments of the control method for the multi-band optical transmission system of the present application, the above-mentioned "controlling the optical power amplifier, the line optical amplifier, and the pre-optical amplifier to adjust the power slope within each band" may include: determining the band slope adjustment amount for each band based on the channel-level output power spectrum of the pre-optical amplifier at the tail end of the optical signal transmission multiplexing section; and controlling the optical power amplifier, the line optical amplifier, and the pre-optical amplifier to adjust the power slope within each band according to each of the band slope adjustment amounts.

[0081] In this embodiment, when the communication device controls the optical power amplifier OBA together with the line optical amplifier OLA and the pre-optical amplifier OPA to adjust the power slope in each band of the optical signal, the communication device first calculates and determines the band slope adjustment amount for each band of the optical signal based on the channel-level output power spectrum of the pre-optical amplifier OPA located at the end of the optical signal transmission multiplexing section; then, the optical power amplifier OBA, the line optical amplifier OLA, and the pre-optical amplifier OPA are controlled to adjust the power slope in each band according to the determined band slope adjustment amount.

[0082] In some feasible embodiments of the control method of the multi-band optical transmission system of the present application, the above-mentioned "determining the band slope adjustment amount of each band based on the channel-level output power spectrum of the pre-optical amplifier at the tail end of the optical signal transmission multiplexing section" may include: measuring the channel-level output power spectrum of the pre-optical amplifier at the tail end of the optical signal transmission multiplexing section through an optical performance monitor; determining the band slope of each band of the optical signal based on fitting the channel-level output power spectrum; and calculating the band slope adjustment amount of each band based on each of the band slopes.

[0083] In this embodiment, the communication device measures the channel-level output power spectrum of the pre-optical amplifier OPA located at the tail end of the optical signal transmission multiplexing section through the optical performance monitor OPM deployed at the head and tail positions of the optical signal transmission multiplexing section, and then performs fitting based on the channel-level output power spectrum to determine the band slopes of each band S, L, and C of the output optical signal, thereby further calculating and determining the band slope adjustment amounts of each band S, L, and C in the output optical signal based on the band slopes of each band S, L, and C.

[0084] For example, assuming that the communication device measures the channel-level output power spectrum of the optical preamplifier OPA located at the end of the optical signal transmission multiplexing section through the optical performance monitor OPM, and the output power slopes of the optical signal S / C / L bands at the end of the optical signal transmission multiplexing section are fitted as TS, TC, and TL respectively, then the communication device can determine the band slope adjustment amount ΔPtilt of each S / C / L band through further calculation: S ×(γ:1:1:...:1-γ), -T C ×(γ:1:1:...:1-γ), -T L ×(γ:1:1:...:1-γ).

[0085] In some feasible embodiments of the control method of the multi-band optical transmission system of the present application, the above-mentioned "controlling the optical power amplifier, the line optical amplifier, and the pre-optical amplifier to adjust the power slope in each band according to the respective band slope adjustment amounts" may include: determining the respective slope adjustment ratios of the optical power amplifier, the line optical amplifier, and the pre-optical amplifier according to the band slope adjustment amounts; and controlling the optical power amplifier, the line optical amplifier, and the pre-optical amplifier to adjust the power slope in each band according to their respective slope adjustment ratios.

[0086] In this embodiment, after the communication device determines the band slope adjustment amount for each of the S, L, and C bands in the outgoing optical signal through the above calculation, it can determine the slope adjustment ratios for each of the outgoing optical power amplifier OBA, the line optical amplifier OLA, and the pre-optical amplifier OPA based on the slope adjustment amount for each band. Thus, the communication device can control the optical power amplifier OBA, the line optical amplifier OLA, and the pre-optical amplifier OPA to adjust the intra-band power slopes of the S, L, and C bands according to their respective slope adjustment ratios.

[0087] For example, taking the power amplifier OBA and the optical preamplifier OPA as examples, it is assumed that the communication device determines through calculation that the band slope adjustment amount ΔPtilt of each band of the optical signal S / C / L is: S ×(γ:1:1:...:1-γ), -T C ×(γ:1:1:...:1-γ), -T L After calculating the slope adjustment value ΔPtilt for each band, the communication device can further determine that γ in the slope adjustment value ΔPtilt for each band is the slope adjustment ratio assigned to the optical power amplifier (OBA), while 1-γ in the ΔPtilt is the slope adjustment ratio assigned to the optical preamplifier (OPA). In this way, the communication device can control the optical power amplifier (OBA) to adjust the intra-band power slope of the S, L, and C bands according to the slope adjustment ratio γ, and synchronously or asynchronously control the optical preamplifier (OPA) to adjust the intra-band power slope of the S, L, and C bands according to the slope adjustment ratio 1-γ.

[0088] The specific value of γ can be 1 / 2. However, it should be understood that based on different design requirements of actual applications, in different feasible embodiments, the value of γ can of course also be other values. That is, the control method of the multi-band optical transmission system of the present application does not specifically limit the value of γ.

[0089] In some feasible embodiments of the control method of the multi-band optical transmission system of the present application, after the communication device performs the above-mentioned "controlling the optical power amplifier, the line optical amplifier, and the pre-optical amplifier to adjust the power slope in each band according to the slope adjustment amount of each band", the control method of the multi-band optical transmission system of the present application may further include:

[0090] If the third preset condition is not met, iteratively executing the operations of controlling the optical power amplifier to adjust the power between the bands and controlling the optical power amplifier, the line optical amplifier, and the pre-optical amplifier to adjust the power slope within each band, wherein the third preset condition is that the output power adjustment amount between the bands is less than a third preset threshold, and the band slope adjustment amount of each band is less than a fourth preset threshold.

[0091] In this embodiment, when controlling the optical power amplifier OBA to adjust the output power between bands of the multi-band optical signal, and when controlling the optical power amplifier OBA, the line optical amplifier OLA, and the pre-optical amplifier OPA to adjust the power slope of each band of the multi-band optical signal, the communication device continuously monitors whether an output power adjustment amount ΔPInter-band between bands of the multi-band optical signal after the optical power amplifier OBA performs power adjustment is less than a third preset threshold, and monitors whether a band slope adjustment amount ΔPtilt used by controlling the optical power amplifier OBA, the line optical amplifier OLA, and the pre-optical amplifier OPA to adjust the power slope of each band of the multi-band optical signal is less than a fourth preset threshold. If it is monitored that the output power adjustment amount ΔPInter-band between bands is less than the third preset threshold and the band slope adjustment amount ΔPtilt of each band is less than the fourth preset threshold, it is determined that the power adjustment currently being jointly performed by controlling the optical power amplifier OBA, the line optical amplifier OLA, and the pre-optical amplifier OPA meets the third preset condition.

[0092] On the contrary, if the communication device monitors that the output power adjustment amount ΔPInter-band between the bands is not less than the third preset threshold, or the band slope adjustment amount ΔPtilt of each band is not less than the fourth preset threshold, it is determined that the current joint power adjustment does not meet the third preset condition. Then, the communication device iterates the above-mentioned "controlling the optical power amplifier to adjust the power between the bands" and "controlling the optical power amplifier, the line optical amplifier and the pre-optical amplifier to adjust the power slope within each band" operations, and repeats this cycle until monitoring determines that the current joint power adjustment meets the third preset condition.

[0093] In this embodiment, the third preset threshold and the fourth threshold can both be 0.1 dB. Similarly, it should be understood that based on different design requirements of actual applications, in different feasible embodiments, the specific values ​​of the third preset threshold and the fourth threshold can of course be other values. That is, the control method of the multi-band optical transmission system of the present application is not limited to the specific values ​​of the third preset threshold and the fourth threshold.

[0094] In some feasible embodiments of the control method of the multi-band optical transmission system of the present application, when the communication device monitors and determines that the currently jointly performed power adjustment meets the third preset condition, the control method of the multi-band optical transmission system of the present application may further include: determining a target output power spectrum based on the actual output power spectrum of the optical signal transmission multiplexing section, and determining the channel-level power balancing amount of the optical signal transmission multiplexing section; determining the maximum nonlinear cost of the multi-band optical transmission system based on the channel-level power balancing amount; and when the maximum nonlinear cost meets the preset nonlinear effect condition, determining and outputting the optical signal input fiber power of the multi-band optical transmission system.

[0095] In this embodiment, when the communication device detects that the output power adjustment amount between each band of the multi-band optical signal is less than the third preset threshold value and the band slope adjustment amount of each band is less than the fourth preset threshold value, thereby determining that the power adjustment currently being performed jointly by the controlled optical power amplifier (OBA), line optical amplifier (OLA), and pre-optical amplifier (OPA) satisfies the third preset condition, the communication device determines a target output power spectrum based on the actual output power spectrum of the optical signal transmission multiplex section after the joint power adjustment. Furthermore, the communication device determines a channel-level power balancing amount for the optical signal transmission multiplex section, and determines the maximum nonlinear cost of the currently controlled multi-band optical transmission system based on the channel-level power balancing amount. Thus, if the maximum nonlinear cost satisfies the preset nonlinear effect condition, the communication device determines and outputs the optical signal input fiber power of the multi-band optical transmission system.

[0096] In this embodiment, the above-mentioned preset nonlinear effect conditions include: the value of the above-mentioned maximum nonlinear cost is less than the fifth preset threshold, the value of the filtering cost for optical signal transmission is less than the sixth preset threshold, and the optical signal-to-noise ratio net margin of the worst wave in each band is equal and greater than or equal to the seventh preset threshold. Among them, the fifth preset threshold and the sixth preset threshold can be the same and both have a value of 0.1dB, and the seventh preset threshold can specifically be 2dB. It should be understood that based on the different design requirements of actual applications, in different feasible embodiments, the specific values ​​of the fifth preset threshold, the sixth preset threshold and the seventh threshold can of course also be other values, that is, the control method of the multi-band optical transmission system of the present application is not limited to the specific values ​​of the fifth preset threshold, the sixth preset threshold and the seventh threshold.

[0097] For example, as shown in FIG4 , after the communication device controls the optical power amplifier OBA to adjust the output power between each band of the multi-band optical signal, if the maximum value of the output power adjustment amount ΔPInter-band for adjusting the output power of each band is less than the third preset threshold value 0.1 dB, and after the communication device controls the optical power amplifier OBA, the line optical amplifier, and the pre-optical amplifier OPA to adjust the power slope within each band of the optical signal, the maximum value of the band slope adjustment amount ΔPtilt of each band is also less than the fourth preset threshold value 0.1 dB, then it means that at this time, after the optical power amplifier OBA, the line optical amplifier, and the pre-optical amplifier OPA are controlled to jointly adjust the power of the optical signal, the total power between the bands is in a balanced state, and the slope within the band has been evenly distributed to each span according to the span.

[0098] If it is determined that the maximum value of the output power adjustment amount ΔPInter-band is not less than the third preset threshold value 0.1dB, or the maximum value of the band slope adjustment amount ΔPtilt is not less than the fourth preset threshold value 0.1dB, the communication device needs to return to the above-mentioned "controlling the line optical amplifier and the pre-optical amplifier to adjust" operation to continue a new round of optical signal transmission multiplexing band band-level power joint adjustment cycle, otherwise enter the next step of "channel-level power balancing" operation.

[0099] During the "channel-level power balancing" operation, the communication equipment monitors the actual output power spectrum of the entire optical signal transmission multiplexing section through optical performance monitors (OPMs) deployed at the beginning and end of the optical signal transmission multiplexing section. The target output power spectrum is calculated according to the slope of the actual output power spectrum fit while ensuring that the total power of the optical signal transmission multiplexing section remains unchanged. Therefore, the communication equipment can calculate the channel-level power balancing amount of the entire optical signal transmission multiplexing section (i.e., the channel-level attenuation ΔPOCH of the band selection switch WSS in the optical cross-site) by taking the difference between the above target output power spectrum and the actual output power and dividing it by α (α is 1 / 2, representing the proportion of system unevenness shared by the transmitting and receiving ends).

[0100] In some feasible embodiments of the control method of the multi-band optical transmission system of the present application, the communication equipment can specifically, after the fiber-input power spectrum is formed after the power joint adjustment optimization of the optical signal transmission multiplexing segment, bring the channel-level power balancing amount calculated based on the above-mentioned target output power spectrum and the actual output power into the enhanced Gaussian noise EGN model to evaluate the maximum nonlinear cost (in the S+C+L optical signal transmission system, generally located in the S-band short wavelength), and determine whether the above-mentioned nonlinear effect conditions are met based on the value of the maximum nonlinear cost.

[0101] Therefore, when the communication device compares and finds that 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 the optical signal transmission of the entire multi-band optical signal transmission system obtained through evaluation using the enhanced Gaussian noise (EGN) model is less than the sixth preset threshold of 0.1 dB, and the net margin of the optical signal-to-noise ratio (OSNR) of the worst wave in each of the S / L / C bands is equal and greater than or equal to the seventh preset threshold of 2 dB, the communication device determines that after controlling the optical power amplifier (OBA), line amplifier (OLA), and pre-optical amplifier (OPA) in the current optical signal transmission multiplex section for joint power adjustment, the maximum nonlinear cost of the entire optical signal transmission multiplex section meets the nonlinear effect condition, that is, the input fiber power of the optical signal transmission multiplex section after the current adjustment has optimized the overall performance of the multi-band optical signal transmission system, thereby determining and outputting the final power adjustment adjustment amount and the optical signal input fiber power of each component in the entire system.

[0102] In other feasible embodiments of the control method of the multi-band optical transmission system of the present application, after the above-mentioned "determining the maximum nonlinear cost of the multi-band optical transmission system based on the channel-level power balancing amount", the control method of the multi-band optical transmission system of the present application may also include: when the maximum nonlinear cost does not meet the nonlinear effect condition, iteratively executing the control of multiple power adjustment points to perform a joint adjustment operation of intra-band power and inter-band power until the maximum nonlinear cost meets the nonlinear effect condition.

[0103] In this embodiment, after the communication device calculates and determines the maximum nonlinear cost of the currently controlled multi-band optical transmission system through the above process, if it detects and determines that the maximum nonlinear cost still does not meet the above-mentioned nonlinear effect condition, then the communication device still needs to iteratively perform the above-mentioned "control multiple power adjustment points to perform joint adjustment of intra-band power and inter-band power" operation, and repeat this cycle until the maximum nonlinear cost meets the nonlinear effect condition, and then determine and output the optical signal input fiber power of the multi-band optical transmission system.

[0104] For example, as shown in FIG4 , after the communication device calculates the channel-level power equalization amount determined based on the target output power spectrum and the actual output power, and brings it into the enhanced Gaussian noise EGN model to evaluate the maximum nonlinear cost, if the communication device further compares that the value of the maximum nonlinear cost is not less than the fifth preset threshold value of 0.1 dB, or the value of the filtering cost of the entire multi-band optical signal transmission system for the optical signal transmission obtained by the enhanced Gaussian noise EGN model is not less than the sixth preset threshold value of 0.1 dB, or the optical signal-to-noise ratio (OSNR) net margin of the worst wave in each band of the optical signal S / L / C is equal but less than the seventh preset threshold value of 2d B, the communication device determines that after controlling the optical power amplifier OBA, line amplifier OLA and pre-optical amplifier OPA in the current optical signal transmission multiplexing section to perform joint power adjustment, the maximum nonlinear cost of the entire optical signal transmission multiplexing section does not meet the nonlinear effect condition. In this way, the communication device determines that it is currently necessary to further adjust the single-wavelength input fiber power of the optical power amplifier OBA in each band of the optical signal, that is, re-enter the above-mentioned iterative process of "controlling multiple power adjustment points to perform joint adjustment of intra-band power and inter-band power", and repeat this cycle until it is determined that the maximum nonlinear cost of the entire optical signal transmission multiplexing section meets the nonlinear effect condition.

[0105] In this embodiment, the control method of the multi-band optical transmission system of the present application determines the channel-level power balancing amount of the optical signal transmission multiplexing segment by the communication device, so as to determine the maximum nonlinear cost of the multi-band optical transmission system based on the channel-level power balancing amount, thereby determining and outputting the optical signal input fiber power of the multi-band optical transmission system when the maximum nonlinear cost meets the preset nonlinear effect condition, and when the maximum nonlinear cost does not meet the nonlinear effect condition, it iteratively executes the control of multiple power adjustment points to perform a joint adjustment operation of the intra-band power and the inter-band power until the maximum nonlinear cost meets the nonlinear effect condition. In this way, the control method of the multi-band optical transmission system of the present application can effectively limit the nonlinear cost of the S+C+L multi-band optical signal during the transmission process, and make the maximum nonlinear cost meet the engineering standard by limiting the input fiber power distribution.

[0106] In addition, the control method of the multi-band optical transmission system of the present application can effectively adjust the net OSNR margin of each band of the S+C+L multi-band signal to meet engineering standards by evaluating the transmission OSNR and cost of the worst wave in each band and reasonably controlling the fiber input power distribution.

[0107] In a feasible embodiment of the control method for a multi-band optical transmission system of the present application, it is assumed that the multi-band optical signal transmission system controlled by the communication device is a first S+C+L band optical transmission system, and that the first S+C+L band optical transmission system is specifically an 800G PCS-16QAM 183GBd 80-wave system with a grid configuration of 200GHz, and the system operating band occupies S+C+L, a total of 16THz. In the multi-band optical signal transmitted by this system, the S band occupies 4THz, a total of 20 waves, the C band occupies 6THz, a total of 30 waves, and the L band occupies 6THz, a total of 30 waves. Assuming a transmission environment of single multiplexing section equal span length (a total of 5 spans, i.e., N=5, G.654E optical fiber), a single span length of 75km, and a span loss of 20dB / span, the control method for the multi-band optical transmission system of the present application is applied to the first S+C+L band optical transmission system to achieve the channel power and optical signal-to-noise ratio (OSNR) balancing effect, as shown in FIG5 .

[0108] The modulation pattern of this first S+C+L band optical transmission system has a B2B OSNR tolerance of 20.5 dB. It utilizes multi-subcarrier multiplexing technology, consisting of eight subcarriers within a 183 GBd spectrum. The average loss coefficients for the S / C / L bands in G.654 fiber are 0.182 dB, 0.171 dB, and 0.173 dB, respectively. Considering the OBM cascade structure, the insertion losses for the S / C / L bands are 1.4 dB, 1.2 dB, and 0.8 dB, respectively. The optical amplifier noise figures for the S / C / L bands are 8, 5.5, and 7 dB, respectively. Evaluation of the filtering impairments for this pattern in the current configuration indicates that they are negligible.

[0109] When the communication equipment controls the optical power amplifier (OBA), line optical amplifier (OLA), and pre-optical amplifier (OPA) in a specific optical signal transmission multiplexing section of the first S+C+L band optical transmission system to jointly adjust the intra-band and inter-band power, the optical power amplifier (OBA) can be configured to have an initial single-wavelength fiber input power of +6dBm in the S / C / L bands. As shown in Figure 5, after four iterations (steps 1-3) in Figure 4, the power flatness at the receiving end (connected to the output of the pre-optical amplifier (OPA)) is continuously optimized. However, due to nonlinear effects, the initial fiber input power needs to be updated. After this update, steps 1-4 in Figure 4 are repeated, resulting in average single-wavelength fiber input powers of 9.45, 3.65, and 1.79 dB in the S / C / L bands, respectively. At this point, the maximum OSNR flatness in the S / C / L bands remains less than 1 dB, and the power flatness is within 1.5 dB, meeting expectations.

[0110] The modulation code of the first S+C+L band optical transmission system is evaluated by engineering on the limit transmission distance of G.654 optical fiber in the S+C+L band through communication equipment, that is, the worst-case net OSNR margin of the S / C / L band is controlled to be equal to and approximately equal to 2 dB, the control system nonlinearity and filtering cost is <1 dB. Evaluation results show that in G.654E optical fiber, this modulation code supports 1200 km transmission. The average single-wavelength fiber power in the S / C / L bands is 9.45, 3.65, and 1.79 dB, respectively. The Raman additional loss in the S / C / L bands is 1.94, -0.83, and -2.79 dB, respectively. The OSNR flatness in the S / C / L bands is 0.35, 0.75, and 0.25 dB, respectively. The maximum nonlinear cost in the S / C / L bands is 0.94, 0.27, and 0.01 dB. At this time, the net OSNR margin of the worst wave in the S / C / L bands is 2.1, 2.1, and 2.1 dB, respectively, and the OSNR is balanced.

[0111] In summary, after the communication equipment controls the combined adjustment of intra-band and inter-band power, the first S+C+L system is capable of transmitting multi-band optical signals over long distances. Furthermore, the combined adjustment of intra-band and inter-band power, controlled by the communication equipment, has a fast convergence speed and low overall computational complexity.

[0112] In another feasible embodiment of the control method of the multi-band optical transmission system of the present application, by replacing the transmission optical fiber of the above-mentioned first S+C+L band optical transmission system with a more commonly used G.652 optical fiber, the average loss coefficients of the S / C / L bands in the G.652 optical fiber are 0.206dB, 0.194dB, and 0.194dB respectively, and the cross-segment loss is changed to 22dB, while other conditions remain unchanged to form a second S+C+L band optical transmission system. Then, the control method of the multi-band optical transmission system of the present application is applied to the second S+C+L band optical transmission system to still optimize the system.

[0113] Similarly, following the same process as above, after jointly adjusting the intra-band power and inter-band power at each power adjustment point in each optical signal transmission multiplexing section of the second S+C+L band optical transmission system, an engineering evaluation was conducted on the limit transmission distance of the modulation code type in the G.652 optical fiber in the S+C+L band, that is, the worst-case net OSNR margin of the S / C / L bands was controlled to be equal and approximately equal to 2dB, and the system nonlinearity and filtering cost were controlled to be <1dB. The evaluation results showed that in the G.654E optical fiber, the modulation code type supports a transmission distance of 1200km. The average single-wave input power in the S / C / L bands is 8.73, 1.82, and -1.01 dB, respectively. The Raman additional loss in the S / C / L bands is 2.49, -1.19, and -1.01 dB, respectively. The OSNR flatness in the S / C / L bands is 0.60, 0.94, and 0.60 dB, respectively. The maximum nonlinear penalty in the S / C / L bands is 1.04, 0.22, and 0.01 dB. At this time, the net OSNR margin of the worst wave in the S / C / L bands is 2.1, 2.1, and 2.0 dB, respectively, and the OSNR is also balanced.

[0114] Therefore, after the communication equipment controls the combined adjustment of intra-band power and inter-band power, the second S+C+L system also has the ability to transmit multi-band optical signals over long distances. In other words, the control method of the multi-band optical transmission system of this application can cover most networking scenarios in the S+C+L band.

[0115] In addition, an embodiment of the present application also provides a communication device, which includes: a control device of the multi-band optical transmission system as described above, a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the computer program is configured to implement the steps of the control method of the multi-band optical transmission system as described above.

[0116] In addition, an embodiment of the present application also provides a storage medium, which is a computer-readable storage medium. A computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the control method of the multi-band optical transmission system as described above are implemented.

[0117] As used herein, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or system that includes the element.

[0118] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0119] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A control method for a multi-band optical transmission system, wherein: The method comprises: Determining a plurality of power adjustment points in an optical signal transmission multiplexing section of a multi-band optical transmission system; The plurality of power adjustment points are controlled to perform joint adjustment of intra-band power and inter-band power, so that the optical transmission power of the multi-band optical transmission system is in a balanced state.

2. The control method of the multi-band optical transmission system according to claim 1, wherein: The power adjustment points include an optical power amplifier, a line optical amplifier and a pre-optical amplifier; Controlling the plurality of power adjustment points to perform joint adjustment of intra-band power and inter-band power includes: Controlling the line optical amplifier and the pre-optical amplifier to perform adjustment until the total output power of the line optical amplifier, the pre-optical amplifier and the optical power amplifier in each band meets a first preset condition; After the total output power meets the first preset condition, controlling the optical power amplifier to adjust the power between the bands so that the output power between the bands meets the second preset condition; After the power between the bands is adjusted, the optical power amplifier, the line optical amplifier and the pre-optical amplifier are controlled to adjust the power slope within each band.

3. The control method of the multi-band optical transmission system according to claim 2, wherein: The method further comprises: When the total output power does not satisfy the first preset condition, an operation of controlling the line optical amplifier and the pre-optical amplifier to perform adjustment is iteratively performed.

4. The control method of a multi-band optical transmission system according to any one of claims 2 or 3, wherein: The method further comprises: When the difference between the first total output power and the second total output power is less than a first preset threshold, determining that the total output power satisfies the first preset condition; Among them, the first total output power difference is the difference in total output power between the adjusted line optical amplifier and the optical power amplifier; the second total output power difference is the difference in total output power between the adjusted pre-optical amplifier and the optical power amplifier.

5. The control method of the multi-band optical transmission system according to claim 2, wherein: 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; The controlling the optical power amplifier to adjust the inter-band power includes: Control the optical power amplifier to increase the first output power of the first wavelength band optical signal and reduce the second output power of the second wavelength band optical signal; The optical power amplifier is controlled to adjust the third output power of the third-band optical signal according to the adjustment amounts of the first output power and the second output power.

6. The control method of the multi-band optical transmission system according to claim 5, wherein: The method further comprises: In the process of controlling the optical power amplifier to adjust the inter-band power, continuously monitoring the total output power of the optical power amplifier to the multi-band optical signal; When the total output power of the multi-band optical signal by the optical power amplifier is in a constant state, monitoring 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, it is determined that the output power between the bands meets a second preset condition.

7. The control method of the multi-band optical transmission system according to claim 2, wherein: Controlling the optical power amplifier, the line optical amplifier and the pre-optical amplifier to adjust the power slope in each band includes: Determining the band slope adjustment amount of each band according to the channel-level output power spectrum of the pre-optical amplifier at the tail end of the optical signal transmission multiplexing section; The optical power amplifier, the line optical amplifier and the pre-optical amplifier are controlled to adjust the power slope in each band according to the slope adjustment amount of each band.

8. The control method of the multi-band optical transmission system according to claim 7, wherein: The step of determining the band slope adjustment amount of each band according to the channel-level output power spectrum of the pre-optical amplifier at the tail end of the optical signal transmission multiplexing section comprises: Measuring the channel-level output power spectrum of the pre-optical amplifier at the tail end of the optical signal transmission multiplexing section by an optical performance monitor; Determining the band slope of each band of the optical signal according to the channel-level output power spectrum fitting; The band slope adjustment amount of each band is calculated according to the slope of each band.

9. The control method of the multi-band optical transmission system according to claim 7, wherein: Controlling the optical power amplifier, the line optical amplifier and the pre-optical amplifier to adjust the power slope in each band according to the slope adjustment amount of each band, including: Determine the slope adjustment ratio of each of the optical power amplifier, the line optical amplifier and the pre-optical amplifier according to the band slope adjustment amount; The optical power amplifier, the line optical amplifier and the pre-optical amplifier are controlled to adjust the power slope in each band according to their respective slope adjustment ratios.

10. The control method of the multi-band optical transmission system according to claim 7, wherein: After controlling the optical power amplifier, the line optical amplifier and the pre-optical amplifier to adjust the power slope in each band according to the slope adjustment amount of each band, the method further includes: When the third preset condition is not met, iterative execution is performed to control the optical power amplifier to adjust the power between the bands and to control the optical power amplifier, the line optical amplifier and the pre-optical amplifier to adjust the power slope within each band, wherein the third preset condition is that the output power adjustment amount between the bands is less than a third preset threshold, and the band slope adjustment amount of each band is less than a fourth preset threshold.

11. The control method of the multi-band optical transmission system according to claim 10, wherein: When the third preset condition is met, the method further includes: Determine a target output power spectrum according to an actual output power spectrum of the optical signal transmission multiplex section, and determine a channel-level power balancing amount of the optical signal transmission multiplex section; Determining a maximum nonlinear cost of the multi-band optical transmission system according to the channel-level power balancing amount; In a case where the maximum nonlinear cost satisfies a preset nonlinear effect condition, the optical signal input fiber power of the multi-band optical transmission system is determined and output.

12. The control method of the multi-band optical transmission system according to claim 11, wherein: After determining the maximum nonlinear cost of the multi-band optical transmission system according to the channel-level power balancing amount, the method further includes: When the maximum nonlinear cost does not satisfy the nonlinear effect condition, iteratively executes the control of the plurality of power adjustment points to perform a joint adjustment operation of the intra-band power and the inter-band power until the maximum nonlinear cost satisfies the nonlinear effect condition.

13. The control method of a multi-band optical transmission system according to any one of claims 11 or 12, wherein: The preset nonlinear effect conditions include: 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 net margin of the optical signal-to-noise ratio of the worst wave in each band is equal to and greater than or equal to a seventh preset threshold.

14. A communication device, wherein: The communication device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the control method of the multi-band optical transmission system according to any one of claims 1 to 13.

15. A computer-readable storage medium, wherein: The storage medium stores a computer program, and when the computer program is executed by the processor, the steps of the control method of the multi-band optical transmission system according to any one of claims 1 to 13 are implemented.

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