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

Abstract

The invention discloses a control method of a multiband optical transmission system, communication equipment and a storage medium, and belongs to the technical field of optical network communication. The control method of the multiband optical transmission system comprises the following steps: determining a plurality of power regulation 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 of intra-band power and inter-band power, so that the optical transmission power of the multiband optical transmission system is in a balanced state. By adopting the technical scheme of the invention, the power unevenness phenomenon caused by the SRS effect in the optical signal transmission process can be balanced, and the optical transmission system can be prevented from generating out-of-limit nonlinear cost, so that the multi-band wide-spectrum long-distance reliable transmission of the optical transmission system can be realized.

Description

Technical Field

[0001] 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

[0002] In the field of optical communications, the SRS (Stimulated Raman Scattering) effect is a key factor affecting the performance of broadband multi-band optical transmission systems, because the SRS effect will cause the power to transfer from short wavelengths to long wavelengths, and the Raman gain spectrum range will reach a power unevenness of about 100nm, which will cause the entire broadband multi-band optical transmission system to be unable to support long-distance transmission of optical signals. In addition, in related technologies, broadband multi-band optical transmission systems will produce significant nonlinear costs when transmitting optical signals at high power, and the nonlinear effect of optical transmission systems is also an important factor that limits the transmission distance of the system. Summary of the invention

[0003] The main purpose of the present application is to provide a control method, communication equipment and computer-readable storage medium for a multi-band optical transmission system, aiming to balance the power unevenness caused by the SRS effect in the process of transmitting optical signals and avoid the nonlinear cost of over-limit in the optical transmission system, thereby realizing reliable transmission of multi-band, wide-spectrum and long-distance optical transmission systems.

[0004] To achieve the above object, an embodiment of the present application provides a control method for a multi-band optical transmission system, the method comprising:

[0005] Determining a plurality of power adjustment points in an optical signal transmission multiplexing section of a multi-band optical transmission system;

[0006] 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.

[0007] In addition, an embodiment of the present application also provides a communication device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the control method of the multi-band optical transmission system as described above.

[0008] 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 as described above are implemented.

[0009] The embodiments of the present application disclose a control method, apparatus, communication equipment and computer-readable storage medium for a multi-band optical transmission system, wherein a plurality of power adjustment points are determined in an optical signal transmission multiplexing segment of the multi-band optical transmission system; and 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.

[0010] Therefore, the embodiment of the present application determines multiple power adjustment points in the optical signal transmission multiplexing section of the multi-band optical transmission system; and then controls the multiple power adjustment points to jointly adjust the power within the band and the power between the bands, 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 the 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 in the optical transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of an operating device of a hardware operating environment involved in an embodiment of the present application;

[0012] Figure 2 A schematic diagram of the steps of an embodiment of a control method for a multi-band optical transmission system provided in an embodiment of the present application;

[0013] Figure 3 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;

[0014] Figure 4 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;

[0015] Figure 5 A schematic diagram of the equalization effect of a power regulation receiving end involved in an embodiment of a control method for a multi-band optical transmission system provided in an embodiment of the present application.

[0016] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0017] 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.

[0018] Reference Figure 1 , Figure 1This is a schematic diagram of the operating equipment structure of the hardware operating environment involved in the embodiment of the present application.

[0019] 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 the multi-band optical transmission system can be effectively controlled. Specifically, the communication device can be a smart phone, PC, tablet and other terminals.

[0020] like Figure 1 As shown, the operating device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (WIreless-FIdelity, WI-FI) interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM) memory, or a stable non-volatile memory (Non-Volatile Memory, NVM), such as a disk memory. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0021] Those skilled in the art will understand that Figure 1 The structure shown in the figure does not constitute a limitation on the operating device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0022] like Figure 1 As shown, the memory 1005 as a storage medium may include an operating system, a data storage module, a network communication module, a user interface module and a computer program.

[0023] exist Figure 1 In the running device shown, the network interface 1004 is mainly used for data communication with other devices; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the running device of the present application can be set in the running device, and the running device calls the computer program stored in the memory 1005 through the processor 1001, and performs the following operations:

[0024] Determining a plurality of power adjustment points in an optical signal transmission multiplexing section of a multi-band optical transmission system;

[0025] 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.

[0026] Exemplarily, the power adjustment points include an optical power amplifier, a line optical amplifier, and a pre-optical amplifier;

[0027] The processor 1001 may call the computer program stored in the memory 1005 and further perform the following operations:

[0028] 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;

[0029] 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;

[0030] 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.

[0031] Exemplarily, the processor 1001 may call a computer program stored in the memory 1005, and further perform the following operations:

[0032] 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.

[0033] Exemplarily, the processor 1001 may call a computer program stored in the memory 1005, and further perform the following operations:

[0034] 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;

[0035] 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.

[0036] 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;

[0037] The processor 1001 may call the computer program stored in the memory 1005 and further perform the following operations:

[0038] 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;

[0039] 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.

[0040] Exemplarily, the processor 1001 may call a computer program stored in the memory 1005, and further perform the following operations:

[0041] 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;

[0042] 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;

[0043] 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.

[0044] Exemplarily, the processor 1001 may call a computer program stored in the memory 1005, and further perform the following operations:

[0045] 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;

[0046] 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.

[0047] Exemplarily, the processor 1001 may call a computer program stored in the memory 1005, and further perform the following operations:

[0048] 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;

[0049] Determining the band slope of each band of the optical signal according to the channel-level output power spectrum fitting;

[0050] The band slope adjustment amount of each band is calculated respectively according to the slope of each band.

[0051] Exemplarily, the processor 1001 may call a computer program stored in the memory 1005, and further perform the following operations:

[0052] 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;

[0053] 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.

[0054] Exemplarily, the processor 1001 may call a computer program stored in the memory 1005, and after executing the control of 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, further perform the following operations:

[0055] 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.

[0056] Exemplarily, when the third preset condition is met, the processor 1001 may call the computer program stored in the memory 1005, and further perform the following operations:

[0057] 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;

[0058] Determining a maximum nonlinear cost of the multi-band optical transmission system according to the channel-level power balancing amount;

[0059] 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.

[0060] Exemplarily, the processor 1001 may call a computer program stored in the memory 1005, and after determining the maximum nonlinear cost of the multi-band optical transmission system according to the channel-level power balancing amount, further perform the following operations:

[0061] 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.

[0062] 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.

[0063] 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.

[0064] In the field of optical communications, the SRS (Stimulated Raman Scattering) effect is a key factor affecting the performance of broadband multi-band optical transmission systems, because the SRS effect will cause the power to transfer from short wavelengths to long wavelengths, and the Raman gain spectrum range will reach a power unevenness of about 100nm, which will cause the entire broadband multi-band optical transmission system to be unable to support long-distance transmission of optical signals. In addition, in related technologies, broadband multi-band optical transmission systems will produce significant nonlinear costs when transmitting optical signals at high power, and the nonlinear effect of optical transmission systems is also an important factor that limits the transmission distance of the system.

[0065] In view of 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; and 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 the 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 in the optical transmission system.

[0066] Based on the overall concept of the control method of the multi-band optical transmission system provided by the above-mentioned embodiment scheme of the present application, various embodiments of the control method of the multi-band optical transmission system of the present application are proposed.

[0067] It should be noted that the control method of the multi-band optical transmission system of the present application is applied to the above-mentioned operating equipment, and the operating equipment can be a communication device integrated in the multi-band optical transmission system or connected to the multi-band optical transmission system. It should be understood that based on different design requirements of actual applications, in different feasible embodiments, the control method of the multi-band optical transmission system of the present application can of course also be applied to other terminal devices. In order to facilitate understanding and explanation of the technical solution, the following text uses the communication device as the execution subject of the solution implementation to explain the control method of the multi-band optical transmission system of the present application.

[0068] Please refer to Figure 2 , Figure 2 This is a schematic flow chart of the steps of the first embodiment of the control method of the multi-band optical transmission system of the present application. It should be noted that although the logical order is shown in the flow chart, in some cases, the control method of the multi-band optical transmission system of the present application can of course perform the steps shown or described in a different order than that here.

[0069] like Figure 2 As shown, in the first embodiment 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 provided by the present application may include the following steps:

[0070] Step S10, determining a plurality of power adjustment points in an optical signal transmission multiplexing section of a multi-band optical transmission system;

[0071] 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.

[0072] It should be noted that 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, and the S+C+L optical transmission system may specifically be a long-distance 800G×80λ system applied to the next generation OTN (optical transport network) network. In addition, it should be understood that, based on different design requirements of actual applications, the multi-band optical transmission system may of course also be other systems for transmitting optical signals including multiple bands.

[0073] For example, assuming that the above multi-band optical transmission system is a high-capacity transmission system using a high-spectral-efficiency 800G 85GBd PCS-64QAM modulation code and a configuration grid of 87.5GHz, namely, a C6T+L6T+S6T optical transmission system, the single-fiber capacity of the C6T+L6T+S6T optical transmission system can support up to 800×204λ=163.2Tbit / s. Figure 3 As shown, in the process of controlling the C6T+L6T+S6T optical transmission system to perform long-distance transmission of optical signals including 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 that require band-level power adjustment.

[0074] 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.

[0075] In this embodiment, after the communication device determines 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.

[0076] For example, Figure 3As shown, in the process of long-distance transmission of optical signals including S band, C band and L band by C6T+L6T+S6T optical transmission system, the wavelength division multiplexing signals of optical signals S, C and L bands are configured with channel attenuation and grid for each service through the optical cross-point, and the dummy light of the placeholder wavelength is put on the road at the optical cross-point to make the whole band fully equipped, and then the optical signal enters the optical signal transmission multiplexing section after adjusting the total power through optical attenuation. At this time, the communication equipment controls and C6T+L6T+S6T optical transmission system is amplified by the optical power amplifier OBA in the optical signal transmission multiplexing section, and then it is combined by the optical band multiplexer OBM to enter the optical fiber link for transmission, and the optical attenuation after the optical fiber is used to adjust the cross-section loss, and then the optical signal is separated by the optical band multiplexer OBM into the S, C and L bands of the optical signal, and the line optical amplifier OLA amplifies the service optical signal of each band, and then it is combined by the optical band multiplexer OBM. Thus, after the optical signal circulates N-1 optical signal transmission multiplexing section spans, it is transmitted through the last optical fiber span and then split by the optical band multiplexer OBM to enter the pre-optical amplifier OPA at the receiving end for power amplification. Finally, the optical signal transmission multiplexing section is transmitted to multiple optical cross-connection sites, and the optical cross-connection site decides which direction the optical signals of the S, C, and L bands go. The dummy light wavelength is also dropped / blocked at the optical cross-connection site.

[0077] 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 the 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 of the optical transmission system.

[0078] Optionally, in some feasible embodiments of the control method of the multi-band optical transmission system of the present application, the power adjustment point includes 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 the plurality of power adjustment points to perform joint adjustment of intra-band power and inter-band power" may include:

[0079] 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;

[0080] 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;

[0081] 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.

[0082] In this embodiment, when the communication device controls the optical power amplifier OBA, the line optical amplifier OLA and the pre-optical amplifier OPA in each optical signal transmission multiplexing segment of the multi-band optical transmission system to perform joint adjustment of the intra-band power and the inter-band power, the line optical amplifier OLA and the pre-optical amplifier OPA can be controlled 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 the first preset condition.

[0083] Afterwards, when 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 band of the optical signal meets the first preset condition, the communication device can further control the optical power amplifier OBA to adjust the power between the bands of the optical signal, and iteratively control the optical power amplifier OBA to adjust the power between the bands of the optical signal until the output power between the bands of the optical signal meets the second preset condition.

[0084] In addition, after controlling the optical power amplifier OBA to adjust the power between the various bands of the optical signal, the communication device can also synchronously or asynchronously control the optical power amplifier OBA together with the above-mentioned line optical amplifier OLA and pre-optical amplifier OPA to adjust the power slope within each band of the optical signal. In this way, the communication device controls the optical power amplifier OBA, line optical amplifier OLA and pre-optical amplifier OPA in the optical signal transmission multiplexing section to jointly adjust the power within the band and the power between the bands so that the optical transmission power of the entire multi-band optical transmission system is in a balanced state.

[0085] Optionally, 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:

[0086] 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.

[0087] In this embodiment, in the process of controlling the line optical amplifier OLA and the pre-optical amplifier OPA to adjust the power, the communication device also continuously monitors the total output power of the line optical amplifier OLA and the pre-optical amplifier OPA and the optical power amplifier OBA in each band of the optical signal, and determines whether the total output power meets the above-mentioned first preset condition. In this way, after each time the communication device controls the line optical amplifier OLA and the pre-optical amplifier OPA to adjust the power, if it is determined that the total output power still does not meet the first preset condition, the operation of iteratively controlling the line optical amplifier OLA and the pre-optical amplifier OPA to adjust the power continues. In this way, the process of controlling the line optical amplifier OLA and the pre-optical amplifier OPA to adjust the power is cyclically performed until the total output power meets the first preset condition.

[0088] Optionally, in some feasible embodiments of the control method of the multi-band optical transmission system of the present application, the above-mentioned first preset condition can be: the difference in total output power between the line optical amplifier and the optical power amplifier after power adjustment is less than the 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 the first preset threshold. The first preset threshold can specifically be 0.1dB. It should be understood that based on different design requirements of actual applications, in different feasible embodiments, the specific value of the first preset 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 value of the first preset threshold.

[0089] Based on this, the control method of the multi-band optical transmission system of the present application may also include:

[0090] When the difference between the first total output power and the difference between the second total output power is smaller than a first preset threshold, it is determined that the total output power meets the first preset condition.

[0091] It should be noted that, 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.

[0092] In this embodiment, the communication device continuously monitors 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 band of the optical signal during the process of controlling the line optical amplifier OLA and the pre-optical amplifier OPA to perform power adjustment, thereby calculating and determining the difference in total output power between the line optical amplifier and the optical power amplifier after power adjustment - the 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 - the second total output power difference.

[0093] Afterwards, 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, 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 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. On the contrary, when 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, the communication device determines that the total output power does not meet the first preset condition.

[0094] For example, Figure 4 As shown, the communication equipment 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. First, the single-wavelength fiber input power of the optical signal S, C and L bands in the optical power amplifier OBA is initialized to be and After that, the communication device controls the line optical amplifier OLA and the front optical amplifier OPA to adjust the power within the band so that the total power within the band is pre-balanced. That is, the communication device sets the gain of the rear-stage line optical amplifier OLA and the front optical amplifier OPA respectively so that the total output power of the line optical amplifier OLA and the front optical amplifier OPA is equal to the total output power of the optical power amplifier OBA, that is:

[0095]

[0096]

[0097]

[0098] Wherein, N is the number of optical fiber spans contained in a single optical signal transmission multiplexing section; Num_S, Num_C and Num_L are the total number of wavelengths of the optical signal S, C and L bands respectively.

[0099] In addition, in the process of controlling the line optical amplifier OLA and the pre-optical amplifier OPA to adjust the power within the band so as to pre-balance the total power within the band, the communication device also synchronously records the difference in the 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 in each signal transmission multiplexing section as ΔOTS, and when the maximum value of the ΔOTS is less than the first preset threshold value of 0.1dB, it is determined 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 band of the optical signal meets the first preset condition, so that 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 can be performed. Otherwise, the communication device will cyclically control the line optical amplifier OLA and the pre-optical amplifier OPA to adjust the power within the band.

[0100] Further, 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:

[0101] 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;

[0102] 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.

[0103] 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, the optical power amplifier OBA can be controlled to increase the first output power of the first band optical signal, namely the S band optical signal, and simultaneously reduce the second output power of the second band optical signal, namely the L band optical signal. In addition, the communication device also controls the optical power amplifier OBA to adjust the third output power of the third band optical signal, namely the C band optical signal, according to the respective adjustment amounts of the first output power and the second output power, so that the total output power of the optical power amplifier OBA between the various bands of the optical signal remains unchanged.

[0104] It should be noted that, in the present embodiment, when the communication device controls the optical power amplifier OBA to adjust the output power between the bands of the optical signal so as to balance the power between the 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 cooperate with the S+L band.

[0105] 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:

[0106] 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;

[0107] 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;

[0108] 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.

[0109] 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, it can also continuously monitor the total output power of the optical power amplifier OBA for the different bands of the multi-band optical signal. Thus, when the optical power amplifier OBA keeps the total output power unchanged, the optical power amplifier OBA continuously monitors the power difference between the first output power of the first band optical signal, namely the S band optical signal, the second output power of the second band optical signal, namely the L band optical signal, and the third output power of the third band optical signal, namely the C band optical signal, and detects whether the maximum difference among the various power differences is less than the second preset threshold. In this way, when the maximum difference is less than the second preset threshold and it is determined that the various power differences are all less than the second preset threshold, the communication device determines that after the optical power amplifier OBA is currently controlled to adjust the output power between the various bands of the optical signal, the output power between the various bands meets the second preset condition.

[0110] It should be noted that, in this embodiment, the second preset threshold value may also be 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 also 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.

[0111] For example, Figure 4 As shown, 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 S It can be expressed as:

[0112]

[0113] in, and represents the total output power of the optical power amplifier OBA and the line optical amplifier OLA in the i-th optical fiber span in the C-band and S-band, respectively, and They represent the total input power of the C-band and S-band optical power amplifier OBA and the total input power of the line optical amplifier OLA in the i-th optical fiber span, respectively.

[0114] After that, 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, so that when к is also 1 / 2, the adjustment amount ΔP of the L band L It can be expressed as:

[0115]

[0116] in, They represent respectively the total input power of the L-band optical power amplifier OBA and the total input power of the line optical amplifier OLA in the i-th optical fiber span, and the total output power of the L-band optical power amplifier OBA and the total output power of the line optical amplifier OLA in the i-th optical fiber span.

[0117] Furthermore, in order to keep the total fiber-input power of the multi-band optical signal unchanged before and after the optical power amplifier OBA performs power adjustment, the communication equipment also needs to solve the correction value δi of each span of the S / C / L band through the following formula:

[0118]

[0119] Among them, db2pow and pow2db represent the conversion of dB units to linear mW units and the conversion of linear mW units to dB units respectively.

[0120] It can be obtained that the adjustment amount ΔPInter-band required for each span of the S, C, and L bands is ΔPS+δi / 3, ΔPC+δi / 3, and ΔPL+δi / 3 respectively. Therefore, the communication equipment can control the optical power amplifier OBA to adjust the output power of the C-band optical signal according to ΔPC+δi / 3 in the adjustment amount ΔPInter-band.

[0121] Further, 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” may include:

[0122] 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;

[0123] 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.

[0124] 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 band slope adjustment amount of each band of the optical signal is first calculated and determined based on the channel-level output power spectrum of the pre-optical amplifier OPA located at the tail end of the optical signal transmission multiplexing section; and 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 slope adjustment amount of each band.

[0125] Optionally, 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 according to the channel-level output power spectrum of the pre-optical amplifier at the tail end of the optical signal transmission multiplexing section” may include:

[0126] 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;

[0127] Determining the band slope of each band of the optical signal according to the channel-level output power spectrum fitting;

[0128] The band slope adjustment amount of each band is calculated respectively according to the slope of each band.

[0129] In this embodiment, the communication device measures the channel-level output power spectrum of the optical preamplifier 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 fits 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.

[0130] For example, assuming that the communication device measures the channel-level output power spectrum of the optical preamplifier OPA located at the tail 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 tail 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, respectively: -T S ×(γ:1:1:...:1-γ), -T C ×(γ:1:1:...:1-γ), -T L ×(γ:1:1:...:1-γ).

[0131] Optionally, 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 slope adjustment amount of each band” may include:

[0132] 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;

[0133] 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.

[0134] In this embodiment, after the communication device determines the band slope adjustment amount of each of the S, L and C bands in the optical signal through the above calculation, it can determine the slope adjustment ratios of the optical power amplifier OBA, the line optical amplifier OLA and the pre-optical amplifier OPA respectively through the slope adjustment amounts of 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 in-band power slopes of the S, L and C bands according to their respective slope adjustment ratios.

[0135] For example, taking the power amplifier OBA and the pre-optical amplifier 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 respectively: S ×(γ:1:1:...:1-γ), -T C ×(γ:1:1:...:1-γ), -T L ×(γ:1:1:...:1-γ), the communication device can further determine that the γ in the slope adjustment amount ΔPtilt of each band is the slope adjustment ratio allocated to the optical power amplifier OBA, and the 1-γ in the ΔPtilt is the slope adjustment ratio allocated to the pre-optical amplifier 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 pre-optical amplifier OPA to adjust the intra-band power slope of the S, L and C bands according to the slope adjustment ratio 1-γ.

[0136] It should be noted that the specific value of γ can be 1 / 2. 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.

[0137] Further, 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 also include:

[0138] 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.

[0139] In this embodiment, in the process of controlling the optical power amplifier OBA to adjust the output power between each band of the multi-band optical signal, and in the process of 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 the output power adjustment amount ΔPInter-band between each band of the multi-band optical signal after the optical power amplifier OBA performs power adjustment is less than the third preset threshold, and monitors whether the band slope adjustment amount ΔPtilt of the power slope of each band of the multi-band optical signal adjusted by the optical power amplifier OBA, the line optical amplifier OLA and the pre-optical amplifier OPA is less than the fourth preset threshold. In this way, if it is monitored that the output power adjustment amount ΔPInter-band between the 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 controlled by the optical power amplifier OBA, the line optical amplifier OLA and the pre-optical amplifier OPA jointly meets the third preset condition.

[0140] 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.

[0141] It should be noted that, in this embodiment, the third preset threshold and the fourth threshold can be specifically 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 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 third preset threshold and the fourth threshold.

[0142] Optionally, 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:

[0143] 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;

[0144] Determining a maximum nonlinear cost of the multi-band optical transmission system according to the channel-level power balancing amount;

[0145] 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.

[0146] 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 mentioned above, and the band slope adjustment amount of each band is less than the fourth preset threshold value mentioned above, thereby determining that the power adjustment jointly performed by the currently controlled optical power amplifier OBA, the line optical amplifier OLA and the pre-optical amplifier OPA meets the third preset condition mentioned above, the communication device determines the target output power spectrum according to the actual output power spectrum of the optical signal transmission multiplexing section after the power joint adjustment. In addition, the communication device also determines the channel-level power balancing amount of the optical signal transmission multiplexing section, so as to determine the maximum nonlinear cost of the currently controlled multi-band optical transmission system according to the channel-level power balancing amount, so as to determine and output the optical signal input fiber power of the multi-band optical transmission system when the maximum nonlinear cost meets the preset nonlinear effect condition.

[0147] It should be noted that, in the present 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 take a value of 0.1dB, and the seventh preset threshold can specifically take a value of 2dB. It should be understood that, based on 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 does not limit the specific values ​​of the fifth preset threshold, the sixth preset threshold and the seventh threshold.

[0148] For example, Figure 4 As shown, 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 0.1dB, 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 0.1dB, 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 also been evenly distributed to each span according to the span.

[0149] 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 "control the line optical amplifier and the pre-optical amplifier for adjustment" 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.

[0150] When the communication equipment is performing the "channel-level power balancing" operation, the actual output power spectrum of the entire optical signal transmission multiplexing section is monitored by the optical performance monitor OPM deployed at the beginning and end of the optical signal transmission multiplexing section, and the target output power spectrum is calculated according to the slope of the actual output power spectrum fitting while ensuring that the total power of the optical signal transmission multiplexing section remains unchanged. Therefore, the communication equipment can obtain the channel-level power balancing amount of the entire optical signal transmission multiplexing section (that is, the channel-level attenuation ΔPOCH of the band selection switch WSS in the optical cross-site) by subtracting the above-mentioned target output power spectrum from the actual output power and dividing it by α (α is 1 / 2, representing the proportion of the system's unevenness shared by the transmitting and receiving ends).

[0151] Optionally, in some feasible embodiments of the control method of the multi-band optical transmission system of the present application, the communication device can specifically 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) after the fiber-input power spectrum is formed after the power joint adjustment optimization of the optical signal transmission multiplexing section, and determine whether the above-mentioned nonlinear effect conditions are met based on the value of the maximum nonlinear cost.

[0152] Therefore, when the communication device compares that the value of the above-mentioned maximum nonlinear cost is less than the fifth preset threshold value of 0.1dB, and the value of the filtering cost of the entire multi-band optical signal transmission system for the optical signal transmission is also evaluated by the enhanced Gaussian noise EGN model to be less than the sixth preset threshold value of 0.1dB, and the net margin of the optical signal-to-noise ratio OSNR of the worst wave in each S / L / C band is equal and greater than or equal to the seventh preset threshold value of 2dB, the communication device determines that after controlling the optical power amplifier OBA, the line amplifier OLA and the pre-optical amplifier OPA in the current optical signal transmission multiplex section to perform power joint adjustment, the maximum nonlinear cost of the entire optical signal transmission multiplex section meets the nonlinear effect condition, that is, the fiber input power of the optical signal transmission multiplex section after the current adjustment has made the overall performance of the multi-band optical signal transmission system optimal, thereby determining and outputting the adjustment amount and the optical signal fiber input power of the final power adjustment of each device in the entire system.

[0153] Optionally, in some other feasible embodiments of the control method of the multi-band optical transmission system of the present application, after the above “determining the maximum nonlinear cost of the multi-band optical transmission system according to the channel-level power balancing amount”, the control method of the multi-band optical transmission system of the present application may further include:

[0154] 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.

[0155] 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.

[0156] For example, Figure 4 As shown, after the communication device brings the channel-level power balancing amount determined by calculating the target output power spectrum and the actual output power 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 evaluating 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 2 dB, then the communication device performs the following operations: 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 fiber input power memory 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 process until it is determined that the maximum nonlinear cost of the entire optical signal transmission multiplexing section meets the nonlinear effect condition.

[0157] 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 according to the channel-level power balancing amount, thereby determining and outputting the optical signal fiber input power of the multi-band optical transmission system when the maximum nonlinear cost satisfies the preset nonlinear effect condition, and when the maximum nonlinear cost does not meet the nonlinear effect condition, iteratively executes the control of multiple power adjustment points to perform the 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 standards by limiting the fiber input power distribution.

[0158] In addition, the control method of the multi-band optical transmission system of the present application can also 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.

[0159] Optionally, in a feasible embodiment of the control method of the 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 the first S+C+L band optical transmission system is specifically an 800G PCS-16QAM 183GBd 80-wave system, the grid configuration is 200GHz, the system working band occupies S+C+L, a total of 16THz, and the multi-band optical signal transmitted by the system has an S band occupying 4THz for a total of 20 waves, a C band occupying 6THz for a total of 30 waves, and an L band occupying 6THz for a total of 30 waves. Assuming that the transmission environment is a single multiplexing segment with 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 of the multi-band optical transmission system of the present application is applied to the first S+C+L band optical transmission system, and the balancing effect of the channel power and the optical signal-to-noise ratio OSNR is as follows Figure 5 shown.

[0160] Among them, the modulation code type B2B OSNR tolerance of the first S+C+L band optical transmission system is 20.5dB, and multi-electronic carrier multiplexing technology is adopted, that is, the spectrum width of 183GBd is composed of 8 subcarriers, and the average loss coefficients of the S / C / L bands in the G.654 optical fiber are 0.182dB, 0.171dB, and 0.173dB respectively. Considering the OBM cascade structure, the insertion loss of the S / C / L bands is 1.4dB, 1.2dB, and 0.8dB respectively. The optical amplifier noise coefficients of the S / C / L bands are 8, 5.5, and 7dB respectively. After evaluation, the filtering damage of this code type is very small under the current configuration and can be ignored.

[0161] When the communication device controls the optical power amplifier OBA, the line optical amplifier OLA and the pre-optical amplifier OPA in a certain optical signal transmission multiplexing section of the first S+C+L band optical transmission system to jointly adjust the intra-band power and the inter-band power, the optical power amplifier OBA can be configured to have an initial fiber input power of +6dBm in the single-wave S / C / L band. Figure 5 As shown, after Figure 4 After 4 rounds of iterations (step 1 to step 3), it can be seen that the power flatness of the receiving end (connected to the output of the pre-optical amplifier OPA) is continuously optimized; however, due to the limitation of nonlinear effects, it is necessary to update the initial fiber input power and repeat after updating the initial fiber input power. Figure 4 Steps 1 to 4 in the above diagram are performed, and finally the average single-wavelength fiber power of the S / C / L bands is 9.45, 3.65, and 1.79 dB, respectively. At this point, it can be seen that the maximum OSNR flatness of the S / C / L bands is still less than 1 dB, and the power flatness is within 1.5 dB, which meets expectations.

[0162] Optionally, the modulation code type of the first S+C+L band optical transmission system is evaluated by engineering the limit transmission distance in the G.654 optical fiber in the S+C+L band through communication equipment, that is, the worst wave net OSNR margin of the S / C / L band is controlled to be equal and approximately equal to 2dB, and the nonlinearity of the system and the filtering cost are controlled to be <1dB. The evaluation results show that in the G.654E optical fiber, the modulation code type supports 1200km of transmission, and the average single-wave input fiber power of the S / C / L band is 9.45 , 3.65, 1.79dB, the Raman additional losses in the S / C / L bands are 1.94, -0.83, -2.79dB respectively, the OSNR flatness in the S / C / L bands are 0.35, 0.75, 0.25dB respectively, and the maximum nonlinear cost in the S / C / L bands is 0.94, 0.27, 0.01dB. At this time, the net OSNR margins of the worst waves in the S / C / L bands are 2.1, 2.1, 2.1dB respectively, and the OSNR has reached balance.

[0163] In summary, after the communication device controls the combined adjustment of the intra-band power and the inter-band power, the first S+C+L system has the ability to transmit multi-band optical signals over long distances. In addition, the convergence speed of the combined adjustment of the intra-band power and the inter-band power controlled by the communication device is fast, and the overall calculation complexity is also low.

[0164] Optionally, 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-band 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 well.

[0165] Similarly, following the same process as above, after the intra-band power and inter-band power were jointly adjusted for 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 in the G.652 optical fiber in the S+C+L band, that is, the worst wave net OSNR margin of the S / C / L band was controlled to be equal and approximately equal to 2dB, and the control system nonlinearity and filtering cost were <1dB. The evaluation results showed that in the G.654E optical fiber, the modulation code supports a transmission distance of 1200km. The average single-wave input fiber power in the S / C / L bands is 8.73, 1.82, and -1.01dB respectively, the Raman additional loss in the S / C / L bands is 2.49, -1.19, and -1.01dB respectively, the OSNR flatness in the S / C / L bands is 0.60, 0.94, and 0.60dB respectively, and the maximum nonlinear cost in the S / C / L bands is 1.04, 0.22, and 0.01dB. At this time, the OSNR net margins of the worst waves in the S / C / L bands are 2.1, 2.1, and 2.0dB respectively, and the OSNR has also reached balance.

[0166] Therefore, after the communication equipment controls the combined adjustment of the intra-band power and the inter-band power, the second S+C+L system also has the ability to transmit multi-band optical signals over long distances. That is, the control method of the multi-band optical transmission system of the present application can cover most networking scenarios of the S+C+L band.

[0167] In addition, an embodiment of the present application also provides a communication device, which includes: a control device for 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 for the multi-band optical transmission system as described above.

[0168] In addition, an embodiment of the present application further provides a storage medium, which is a computer-readable storage medium, and stores a computer program 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.

[0169] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0170] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0171] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A control method for a multi-band optical transmission system, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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 respectively according to the slope of each band.

9. The control method of the multi-band optical transmission system according to claim 7, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: The communication device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the control method of the multi-band optical transmission system according to any one of claims 1 to 13.

15. A computer-readable storage medium, characterized in that: 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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