C+L 400G Optical Line Protection Method, System, and Medium

Abstract

The present invention discloses a C+L 400G optical line protection method, system and medium, which relates to the field of optical communication transmission technology. The method includes: calling the main route operation log to perform signal quality analysis and outputting reference signal quality parameters; collecting the backup route signal in real time and comparing it with the reference parameters, and outputting the attenuation difference; performing gain compensation analysis based on the attenuation difference to obtain dynamic compensation parameters; the signal is separated into C band and L band by a wave splitting unit, and enters the dynamic gain adjustment unit for collaborative compensation respectively, and is merged into a C+L band composite signal, which is output to the target transmission link. The present invention solves the technical problem in the prior art that the backup route cannot automatically adjust the gain and slope according to the change of the line status, resulting in a decrease in signal quality after switching. It achieves the technical effect of ensuring seamless signal connection when the main and backup routes are switched through the dynamic gain compensation and slope adjustment mechanism, thereby improving signal transmission quality and system reliability.

Description

Technical Field

[0001] The present invention relates to the field of optical communication transmission technology, and in particular to a C+L 400G optical line protection method, system, and medium. Background Art

[0002] In existing C+L band optical communication systems, to ensure stable transmission of high-bandwidth services, primary and backup routes are typically configured for line protection. When the primary route fails or performance degrades, the system must switch to the backup route to ensure uninterrupted communication. However, the backup route amplifiers (such as EDFAs) used in current technologies often rely on manual configuration or static parameter settings, and are unable to automatically adjust gain and slope based on real-time changes in line status. This can lead to problems such as insufficient signal power and a reduced signal-to-noise ratio after the primary-backup switchover, compromising transmission quality and system reliability. Summary of the Invention

[0003] This application provides a C+L 400G optical line protection method, system, and medium to address the technical problem in the prior art that the backup route cannot automatically adjust the gain and slope according to changes in the line status, resulting in a decrease in signal quality after switching.

[0004] A first aspect of the present application provides a C+L 400G optical line protection method, the method comprising: calling an operation log of a primary route to perform a steady-state analysis of signal quality and outputting a reference signal quality parameter; a monitoring unit collecting a timing optical signal of a backup route in real time based on a preset monitoring window, and outputting a primary-backup route attenuation difference by comparing the timing optical signal with the reference signal quality parameter; a communication unit receiving the primary-backup route attenuation difference performs a gain compensation analysis based on the primary-backup route attenuation difference to obtain a dynamic gain compensation parameter; the backup route optical signal is separated into a C-band signal and an L-band signal by a demultiplexing unit, and then enters a C-band dynamic gain adjustment unit and an L-band dynamic gain adjustment unit respectively; the C-band dynamic gain adjustment unit and the L-band dynamic gain adjustment unit receive and perform coordinated dynamic compensation of the C-band signal and the L-band signal based on the dynamic gain compensation parameter, and output a C-band optimized signal and an L-band optimized signal; the C-band optimized signal and the L-band optimized signal are combined into a C+L-band composite signal by a combining unit, and then output to a target transmission link.

[0005] The second aspect of the present application provides a C+L 400G optical line protection system, which includes: a communication unit; a wavelength combining and decomposing module, which is used to separate the input optical signal into a C-band signal and an L-band signal and supports signal merging; and an optical power amplification module; wherein the optical power amplification module receives the dynamic gain compensation parameters sent by the communication unit, performs slope-gain collaborative compensation on the C-band signal and the L-band signal separated by the wavelength combining and decomposing module, and outputs an optimized signal.

[0006] In a third aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method of the first aspect is implemented.

[0007] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0008] The C+L 400G optical line protection method, system, and medium provided in this application relate to the field of optical communication transmission technology. Reference signal quality parameters are generated through the primary route log, and the backup route is monitored in real time and the output attenuation difference is compared. Based on this, the communication unit generates dynamic gain compensation parameters, adjusts the C-band and L-band signals separately, and merges and outputs them to the transmission link after coordinated compensation. This solves the technical problem in the prior art that the backup route cannot automatically adjust the gain and slope according to changes in the line status, resulting in a decrease in signal quality after switching and poor system stability. The dynamic gain compensation and slope adjustment mechanism is implemented to ensure seamless signal connection when switching between the primary and backup routes, thereby improving the signal transmission quality and system reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0010] Figure 1 A schematic diagram of the C+L 400G optical line protection method provided in an embodiment of the present application;

[0011] Figure 2 Schematic diagram of the structure of the C+L 400G optical line protection system provided in an embodiment of the present application.

[0012] Description of reference numerals: combining unit 1 , demultiplexing unit 2 , C-band dynamic gain adjustment unit 3 , communication unit 4 , L-band dynamic gain adjustment unit 5 . DETAILED DESCRIPTION

[0013] This application provides a C+L 400G optical line protection method, system, and medium to address the technical problem in the prior art that the backup route cannot automatically adjust the gain and slope according to changes in the line status, resulting in a decrease in signal quality after switching.

[0014] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0015] It should be noted that the terms "first", "second", etc. in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or modules that are not clearly listed or inherent to these processes, methods, products or devices.

[0016] Example 1, as Figure 1 As shown, the present application provides a C+L 400G optical line protection method, which includes:

[0017] P10: Call the operation log of the main router to perform steady-state analysis of signal quality and output benchmark signal quality parameters.

[0018] Furthermore, step P10 in the embodiment of the present application further includes:

[0019] P11: Retrieve the signal quality data of the primary route from the downstream relay station to obtain the operation log; P12: Slidingly divide the operation log using a preset steady-state analysis window to obtain multiple sliding window logs; P13: Perform statistical feature calculations based on the multiple sliding window logs to obtain multiple C-band optical power steady-state averages, multiple C-band OSNR steady-state averages, multiple L-band optical power steady-state averages, and multiple L-band OSNR steady-state averages; P14: Time-sequentially weight the multiple C-band optical power steady-state averages, multiple C-band OSNR steady-state averages, multiple L-band optical power steady-state averages, and multiple L-band OSNR steady-state averages to output the reference signal quality parameters. The reference signal quality parameters include C-band reference optical power, C-band reference OSNR, L-band reference optical power, and L-band reference OSNR.

[0020] It should be understood that in order to achieve accurate dynamic compensation of the backup route optical signal, it is first necessary to extract representative steady-state indicators based on the operating status of the primary route as target reference values ​​for subsequent gain and slope adjustments.

[0021] Specifically, the system calls the primary router's operation log and, through a multi-step process, outputs benchmark signal quality parameters. The log's data source is a downstream relay station, which has real-time optical signal monitoring capabilities and continuously transmits signal quality data, including those for the C-band and L-band. The system receives this data through a communication unit, extracts optical power and optical signal-to-noise ratio (OSNR), and records it in the primary router's operation log.

[0022] In order to enhance the stability and representativeness of parameter extraction, a preset steady-state analysis window is used to perform sliding segmentation on the operation log. The steady-state analysis window refers to a time period with a fixed length, which is used to analyze whether the signal state within this period is in a stable operating state. Sliding segmentation is to continuously divide the entire operation log into multiple overlapping or non-overlapping sub-intervals in a step-by-step manner along the time axis, thereby generating multiple sliding window logs. The data in each window log is regarded as a sample set within the same time period for statistical analysis. By using the sliding window method, short-term fluctuations in signal quality can be effectively captured, providing a more refined data basis for subsequent statistical analysis. This segmentation method can ensure the flexibility and adaptability of the analysis while avoiding the complexity of the analysis caused by excessive data volume.

[0023] Subsequently, statistical features are calculated for the optical signal data in each sliding window log, yielding the mean C-band optical power, mean C-band OSNR, mean L-band optical power, and mean L-band OSNR. The C-band (approximately 1530-1565 nm) and L-band (approximately 1565-1625 nm) are two commonly used bands in optical communication systems, representing different optical signal frequency ranges. These means reflect the steady-state performance of the primary route over different time periods and effectively filter out interference caused by transient fluctuations. To enhance the adaptability of the steady-state analysis results to the current network state, a time-series weighting mechanism is applied to these multiple means for fusion. The weighting coefficients can be set based on temporal recency, for example, giving higher weights to recent windows and lower weights to more distant windows. This ensures that the weighted results take into account both historical steady-state performance and current state characteristics.

[0024] After weighting, the final benchmark signal quality parameters are output, including C-band benchmark optical power, C-band benchmark OSNR, L-band benchmark optical power, and L-band benchmark OSNR. These benchmark parameters serve as target inputs for subsequent dynamic compensation of the backup route and are fed into the communication unit, where they are compared with the real-time acquired backup route signals to identify attenuation differences and drive the dynamic gain and slope adjustment mechanisms. This process not only improves the response accuracy when activating the backup route but also ensures signal continuity and transmission quality stability during active / standby switchover. This continuous, efficient, and parameter-constrained analysis mechanism enables automated extraction of benchmark quality parameters for optical line protection, providing key support for the intelligent compensation strategy of the entire C+L 400G optical line protection system.

[0025] P20: The monitoring unit collects the time sequence optical signal of the backup route in real time based on the preset monitoring window, and outputs the attenuation difference between the primary and backup routes by comparing the time sequence optical signal with the reference signal quality parameter.

[0026] Furthermore, step P20 in this embodiment of the present application further includes:

[0027] P21: Based on the multiple C-band optical power steady-state average values, multiple C-band OSNR steady-state average values, multiple L-band optical power steady-state average values ​​and multiple L-band OSNR steady-state average values, solve the steady-state fluctuation interval and output the reference signal fluctuation interval; P22: After smoothing the timing optical signal using the reference signal fluctuation interval, compare the timing optical signal with the reference signal quality parameter and output the primary and backup route attenuation difference, wherein the primary and backup route attenuation difference includes the C-band optical power attenuation difference, the C-band OSNR attenuation difference, the L-band optical power attenuation difference and the L-band OSNR attenuation difference.

[0028] Optionally, in order to achieve dynamic compensation adjustment of the backup route signal, the monitoring unit continuously collects the optical signal status of the backup route under the set real-time monitoring mechanism, and outputs the attenuation difference between the main and backup routes in combination with the reference signal quality parameters extracted from the main route.

[0029] Specifically, the monitoring unit first performs time-series acquisition of the backup route's C+L-band optical signals based on a preset monitoring window. This monitoring window can be set with an appropriate sampling period (e.g., 100ms, 500ms, etc.) based on the service level to ensure that the granularity of the time-series acquisition matches the compensation and adjustment response requirements. During the acquisition process, the monitoring unit extracts the optical power and OSNR values ​​of the C-band and L-band signals, respectively, and records the backup route's time-series optical signal data in a time series format.

[0030] To enhance the robustness of the comparison between the primary and backup routers, a steady-state fluctuation range is introduced as a comparison threshold. Specifically, based on the steady-state mean optical power and OSNR values ​​for the multiple C-band and L-band wavelengths obtained in the previous step, their historical fluctuation characteristics are analyzed and the fluctuation range is calculated. This means that the steady-state fluctuation range for optical power and OSNR in the C-band and L-band wavelengths is determined. This steady-state fluctuation range describes the normal range of fluctuations that may occur in the primary router signal under normal conditions, providing a certain degree of fault tolerance and redundancy.

[0031] This steady-state fluctuation range is then used to smooth the backup route's timing optical signal data. Specifically, this involves applying median filtering or mean sliding filtering to small fluctuations within a short period of time, filtering out noise interference and atypical fluctuations to ensure the stability and reliability of the comparison results. The processed timing signals are fed into the comparison module and compared one by one with the obtained reference signal quality parameters. The C-band optical power attenuation difference, C-band OSNR attenuation difference, L-band optical power attenuation difference, and L-band OSNR attenuation difference are calculated. This primary-backup route attenuation difference quantitatively reflects the difference in signal quality between the backup route and the primary route in the current network environment and serves as a direct driving parameter for subsequent gain compensation and slope adjustment strategies.

[0032] This comparison process is highly automated and real-time, capable of promptly identifying performance deviations in the backup route without manual intervention. It also provides precise input for dynamic compensation, ensuring that the output signal of the backup route quickly approaches the primary performance during service switching, thereby improving the reliability and service continuity of the entire C+L 400G optical line protection system.

[0033] P30: After receiving the attenuation difference between the primary and backup routes, the communication unit performs a gain compensation analysis based on the attenuation difference between the primary and backup routes to obtain a dynamic gain compensation parameter.

[0034] Specifically, the communication unit of the present application is used to receive the attenuation difference between the primary and backup routes output by the monitoring unit, and perform dynamic gain compensation analysis based on the attenuation difference, thereby generating dynamic gain compensation parameters for the C-band and L-band. The attenuation difference between the primary and backup routes refers to the specific difference in optical power and OSNR indicators between the backup route and the primary route in the current network environment, including the C-band optical power attenuation difference, the C-band OSNR attenuation difference, the L-band optical power attenuation difference, and the L-band OSNR attenuation difference, reflecting the degree to which the signal quality of the backup route deviates from the reference value.

[0035] After receiving the four loss differences described above, the communication unit first quantitatively evaluates them and, based on a pre-set adjustment strategy model, determines whether the triggering conditions for initiating gain compensation are met. If the optical power or OSNR loss difference in any band exceeds the pre-set sensitivity threshold, the communication unit enters the gain adjustment analysis process. This analysis, combined with the system's built-in segmented response strategy and compensation priority rules, independently analyzes the C-band and L-band to determine the required compensation direction (gain increase or decrease) and compensation magnitude based on the current network state.

[0036] For example, if the C-band optical power loss differential is -3 dB and the OSNR loss differential is -2 dB, the system will determine that this band suffers from both insufficient signal energy and a decreased signal-to-noise ratio. The communication unit will then prioritize generating a C-band gain increase command and, based on a historical adjustment curve or gradient control strategy, initially set the gain compensation to +3 dB, adjusting the slope to compensate for the lower power in the short-band. Conversely, if there's no significant L-band optical power loss but a significant OSNR decrease, the communication unit will instruct the L-band dynamic gain unit to perform a nonlinear optimization of the slope rather than simply increasing the overall power, to avoid signal distortion caused by overcompensation.

[0037] Finally, the communication unit outputs a set of dynamic gain compensation parameters, including C-band and L-band compensation parameters, and sends them to the optical power amplifier unit via a control interface, driving the subsequent gain and slope adjustment process. This process enables rapid response and intelligent identification of the backup route signal status, ensuring that compensation adjustment is both precise and has a controllable dynamic strategy, improving the robustness and adaptability of the optical line protection mechanism.

[0038] P40: After being separated into a C-band signal and an L-band signal by a wavelength splitting unit, the backup route optical signal enters a C-band dynamic gain adjustment unit and an L-band dynamic gain adjustment unit respectively.

[0039] Optionally, the composite optical signal in the backup route undergoes wavelength separation processing by a wavelength splitter before entering the gain adjustment stage. This wavelength splitter, typically composed of WDM components, efficiently separates the different central wavelength ranges within the composite band, accurately decomposing the input C+L composite optical signal into independent C-band and L-band signals, thereby enabling channel-by-channel processing of signals in different wavelength bands. The wavelength splitting operation is an important prerequisite for subsequent refined gain adjustment, and its accuracy directly affects the compensation accuracy of the final output signal.

[0040] After separation, the C-band signal is directed to the C-band dynamic gain adjustment unit, while the L-band signal is directed to the L-band dynamic gain adjustment unit. The two gain adjustment units perform targeted gain adjustment and slope compensation on the optical signals in the corresponding bands based on the dynamic gain compensation parameters previously generated by the communication unit. Each adjustment unit is equipped with a multi-stage amplification module and a slope control channel, which are used to adjust the power increase and distribution trend within a specific wavelength range in real time based on input commands, thereby correcting for band signal degradation caused by factors such as path loss and device loss.

[0041] For example, if the communication unit determines that the low-wavelength band in the C-band has a -2dB power attenuation while the high-wavelength band remains normal, the C-band adjustment unit will not only increase the overall gain to the set value, but also inject a negative slope correction into the slope control channel to increase the gain in the short-wave band and maintain the gain in the long-wave band, thus achieving slope balance. During this process, the L-band adjustment unit can work independently to perform corresponding asymmetric compensation operations.

[0042] The structural design of independent adjustment after band separation can achieve differentiated and refined compensation of the C+L dual-band optical signal of the backup route, improving the flexibility and control accuracy of signal adjustment, and laying a stable signal foundation for subsequent band merging and link output.

[0043] P50: The C-band dynamic gain adjustment unit and the L-band dynamic gain adjustment unit receive and perform collaborative dynamic compensation on the C-band signal and the L-band signal according to the dynamic gain compensation parameter, and output a C-band optimized signal and an L-band optimized signal.

[0044] Furthermore, step P50 in the embodiment of the present application further includes:

[0045] P51: Output the signal anomaly level by quantifying the attenuation difference between the primary and backup routes; P52: Match the hierarchical response mechanism and the hierarchical adjustment scale according to the signal anomaly level; P53: Match the C multi-level collaborative adjustment instruction and the L multi-level collaborative adjustment instruction according to the C-band compensation parameter and the L-band compensation parameter in the dynamic gain compensation parameter; P54: With the hierarchical adjustment scale as a constraint, execute the C multi-level collaborative adjustment instruction and the L multi-level collaborative adjustment instruction based on the hierarchical response mechanism, perform collaborative dynamic compensation on the C-band signal and the L-band signal, and output the C-band optimized signal and the L-band optimized signal.

[0046] It should be understood that after receiving the demultiplexed optical signals, the C-band dynamic gain adjustment unit and the L-band dynamic gain adjustment unit perform coordinated dynamic compensation on the C-band and L-band signals based on the dynamic gain compensation parameters provided by the communication unit. This process not only performs basic power regulation and slope control but also introduces a graded response mechanism and adjustment scale based on attenuation levels to ensure controllable, progressive, and multi-scenario adaptability of the compensation behavior.

[0047] First, the signal status is quantitatively assessed based on the loss difference between the primary and backup routes. By comparing the absolute values ​​of the C-band and L-band optical power loss differences and the OSNR loss differences, combined with a predefined multi-level anomaly threshold system, the signal anomaly level of the current network status is output. This level indicates the severity of the anomaly on the current optical line, categorized as minor, moderate, or severe, and serves to guide the intensity and priority of subsequent compensation responses.

[0048] Based on these anomaly levels, the compensation strategy library matches corresponding hierarchical response mechanisms and adjustment scales. The response mechanism determines whether to execute immediate compensation, gradual compensation, or redundant buffering adjustment strategies. The adjustment scale defines the acceptable upper limit of adjustment for the current level (such as the maximum gain step value and the allowable slope adjustment range) to prevent signal fluctuations caused by overcompensation triggered by sudden anomalies.

[0049] On this basis, based on the dynamic gain compensation parameters generated by the communication unit, the C-band compensation parameters and L-band compensation parameters are extracted respectively, and the corresponding C multi-level coordinated adjustment instructions and L multi-level coordinated adjustment instructions are matched according to the grading mechanism. These adjustment instructions are divided into different response levels according to the current abnormality level and parameter weight settings, supporting a step-by-step processing flow from coarse adjustment to fine correction. For example, when the C-band abnormality level is "serious", the C multi-level adjustment instructions may include three stages: "first-level rapid power boost + second-level slope optimization + third-level fine-tuning buffer".

[0050] Finally, constrained by matching hierarchical adjustment scales, the aforementioned multi-level adjustment instructions are executed separately for the C-band and L-band signals. During the adjustment process, the control strategies for the C-band and L-band maintain parameter linkage and coordinated adjustment amplitudes, preventing signal structure imbalance caused by independent overcompensation in either band, thereby achieving true collaborative dynamic compensation. The final outputs are optimized C-band and L-band signals, achieving preset quality targets for power balance, signal-to-noise ratio balance, and spectral consistency, meeting the optical line protection requirements for plug-and-play backup links, high-fidelity, and highly stable output.

[0051] Through this refined collaborative compensation strategy, the present invention significantly improves the sensitivity, robustness, and adaptability of backup route compensation, providing more reliable and intelligent full-band protection capabilities for C+L 400G optical lines.

[0052] Furthermore, step P52 of the embodiment of the present application further includes:

[0053] P52-1: Interactively obtain multiple sample compensation priorities and multi-level compensation scales for multiple sample anomaly levels; P52-2: After associating and storing the multiple sample anomaly levels, multiple sample compensation priorities and multi-level compensation scales, perform equidistant disturbance expansion to obtain a hierarchical compensation strategy library; P52-3: Use the signal anomaly level to traverse the hierarchical compensation strategy library to perform upgraded matching judgment, and output the hierarchical response mechanism and hierarchical adjustment scale.

[0054] In one possible embodiment of this application, to enhance the adaptability and intelligence of compensation strategies, after determining the signal anomaly level, the system can further optimize the dynamic matching between the hierarchical response mechanism and the adjustment scale through sample learning and strategy library construction. Through historical interaction and debugging, empirical associations between multiple anomaly states and adjustment strategies are established, forming a basic sample set. Through expansion and matching mechanisms, a generalizable compensation strategy library is constructed, which is then used to determine and output the corresponding signal state.

[0055] Specifically, the sample compensation priorities and multi-level compensation scales corresponding to multiple sample anomaly levels are first obtained interactively. Sample anomaly levels are typically derived from historical operating data or simulation scenarios, including known typical anomalies such as the magnitude of optical power reduction and OSNR degradation trends. The compensation priority indicates the type of compensation strategy that should be prioritized at that anomaly level (e.g., gain adjustment priority, slope optimization priority). The multi-level compensation scale defines control parameters such as the allowable gain adjustment amplitude range and step granularity at different levels. This process can be learned and summarized based on multiple debugging records or actual deployment feedback to form a structured sample comparison table.

[0056] Subsequently, the aforementioned multiple sample data are associated and stored to establish a preliminary response relationship table. Based on this, the equidistant perturbation expansion algorithm is applied to expand the sample space to compensate for atypical level combinations and missing continuous intervals that occur in actual operating conditions. During the expansion process, the system inserts interpolation nodes composed of fixed perturbation steps (such as ±1dB and ±0.5dB) between sample levels and performs a weighted fusion calculation on their compensation priorities and adjustment scales to generate a complete library of graded compensation strategies. This strategy library covers the full range of conditions, from slight deviations to severe degradation, and has high coverage and adaptability.

[0057] Next, using the current signal anomaly level, derived from the quantified primary-standby attenuation difference, as the input index, the system traverses the hierarchical compensation strategy library and employs an ascending-level matching judgment method, searching upwards from the current level until the closest matching strategy entry is found. If there is no exact match at the current level, the previous level's strategy is used as the compensation control benchmark, ensuring that a reasonable response path can be output even under unseen anomaly combinations. Ultimately, a hierarchical response mechanism and hierarchical adjustment scale matching the anomaly level are output as the adjustment logic control framework and parameter constraints, respectively, providing a basis for the subsequent execution of multi-level coordinated compensation instructions in the C-band and L-band.

[0058] This sample-driven compensation strategy construction method effectively enhances the adaptive and multi-scenario generalization capabilities of the compensation control system. It not only supports accurate compensation for standard operating conditions, but also provides controllable and progressive adjustment strategies when facing unknown or boundary conditions, building a sustainable and evolving adjustment mechanism for the C+L 400G optical line protection system.

[0059] P60: After the C-band optimized signal and the L-band optimized signal are combined into a C+L-band composite signal via a combining unit, the composite signal is output to a target transmission link.

[0060] Specifically, after the C-band dynamic gain adjustment unit and the L-band dynamic gain adjustment unit complete dynamic compensation for their respective signals, the system needs to recombine the optimized C-band and L-band signals into a unified composite optical signal to adapt to the single-fiber dual-band transmission requirements of the existing network. To achieve this goal, the system is equipped with a combiner unit to perform the band recombining operation.

[0061] Specifically, the combining unit can be constructed using WDM (wavelength division multiplexing) components, featuring low insertion loss, high passband isolation, and broad-spectrum reception capabilities. This allows it to precisely combine C-band and L-band signals of different center wavelengths according to their spectral positions into a C+L-band composite signal. In this solution, the unit receives signal inputs from two dynamic gain adjustment units based on its internal optical path matching mechanism, maintaining key parameters such as power coupling ratio, spectral tilt, and channel balance within predetermined ranges to prevent signal interference or performance degradation caused by inter-band power differences or combining offsets.

[0062] During the combining process, the physical coupling points of the signals in each band are meticulously designed to ensure that the combined output signal exhibits excellent spectral consistency and temporal stability, and can be seamlessly demultiplexed and identified by subsequent relay stations or line equipment. Ultimately, the C+L band composite signal output by the combining unit enters the target transmission link, replacing the service path of the original primary route and enabling seamless takeover of the backup route at the transport layer. This process requires no human intervention and features fully automated control, minimizing interruption latency and signal disturbances during service switchover.

[0063] This step, as the closed-loop output stage of the dynamic gain adjustment link, not only marks the completion of the construction of the signal recovery path, but also reflects the system compatibility and engineering practicality of this application in dual-band coupled output, further ensuring the deployment feasibility of C+L 400G optical lines in high-performance, high-reliability scenarios.

[0064] In summary, the embodiments of the present application have at least the following technical effects:

[0065] This application performs steady-state analysis of signal quality by calling the main route operation log and outputs the reference signal quality parameters. The monitoring unit collects the backup route optical signal in real time, compares the reference signal quality parameters, and outputs the main and backup route attenuation difference. The communication unit performs gain compensation analysis based on the attenuation difference to obtain dynamic gain compensation parameters. The backup route signal is separated into C-band and L-band signals by the splitter unit, and enters the dynamic gain adjustment unit for collaborative dynamic compensation respectively. The optimized signal is combined into a C+L band composite signal by the combiner unit, and finally output to the target transmission link.

[0066] The technical effect of ensuring seamless signal connection when switching between primary and backup routes is achieved through dynamic gain compensation and slope adjustment mechanism, thereby improving signal transmission quality and system reliability.

[0067] Example 2 is based on the same inventive concept as the C+L 400G optical line protection method in the above embodiment. Figure 2 As shown, the present application provides a C+L 400G optical line protection system. The system and method embodiments in the present application are based on the same inventive concept. The system includes:

[0068] Communication unit 4; a wavelength combining and demultiplexing module for separating the input optical signal into a C-band signal and an L-band signal, and supporting signal merging; an optical power amplification module; wherein the optical power amplification module receives the dynamic gain compensation parameters sent by the communication unit 4, performs slope-gain collaborative compensation on the C-band signal and the L-band signal separated by the wavelength combining and demultiplexing module, and outputs an optimized signal. The wavelength combining and demultiplexing module is composed of a wavelength combining unit 1 and a wavelength demultiplexing unit 2, and the wavelength combining unit 1 and the wavelength demultiplexing unit 2 are both WDM devices. The optical power amplification module is composed of a C-band dynamic gain adjustment unit 3 and an L-band dynamic gain adjustment unit 5.

[0069] It should be understood that the C+L 400G optical line protection system provided in this application is designed to ensure stable signal transmission and service continuity when optical line loss or performance degradation occurs through intelligent dynamic gain compensation and slope adjustment mechanisms. The system's structure and implementation methods are based on the same inventive concept. The following is a description of the system's main components and their functions:

[0070] First, the system includes a communication unit 4, whose primary function is to receive and process information from various devices in the network, particularly optical signal quality data. Communication unit 4 coordinates with other modules in the system (such as optical power amplifiers and multiplexer / demultiplexer modules) to ensure precise signal regulation and transmission throughout the protection link.

[0071] The system's wavelength-combining and demultiplexing modules are responsible for separating and combining the input composite optical signals. They consist of wavelength-combining unit 1 and wavelength-demultiplexing unit 2. Both wavelength-combining unit 1 and wavelength-demultiplexing unit 2 are WDM devices (wavelength division multiplexing) with high wavelength selectivity and low insertion loss. Demultiplexing unit 2 separates the composite C+L-band signal into C-band and L-band signals, while wavelength-combining unit 1 combines the adjusted C-band and L-band signals into a C+L composite signal for output to the downstream transmission link.

[0072] The optical power amplification module receives the dynamic gain compensation parameters sent by the communication unit 4. This module includes a C-band dynamic gain adjustment unit 3 and an L-band dynamic gain adjustment unit 5. The main function of the optical power amplification module is to perform slope-gain synergistic compensation on the C-band and L-band signals based on the received gain compensation parameters. This compensation process not only adjusts the overall gain of the signal but also corrects the slope of the signal, ensuring that the optical power and signal-to-noise ratio of the signal are restored to optimized levels even in the event of signal attenuation. After processing by this module, the adjusted signals are output as optimized C-band and L-band signals, ensuring high signal quality and stability during transmission.

[0073] The entire system design ensures precise control of C-band and L-band signals during separation, adjustment, and merging, and maximizes signal stability and reliability through intelligent gain and slope compensation. The system's modular design enables flexible response to varying optical line conditions, ensuring stable optical signal quality and efficient operation within the network.

[0074] In the third embodiment, based on the same inventive concept as the C+L 400G optical line protection method in the aforementioned embodiment, the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the method in the first embodiment is implemented.

[0075] The detailed description of the C+L 400G optical line protection method in this specification will clearly enable those skilled in the art to understand the C+L 400G optical line protection method, system, and medium of this embodiment. Therefore, for the sake of brevity, a detailed description is omitted here. The device disclosed in the embodiment corresponds to the method disclosed in the embodiment, so the description is relatively simple. For relevant details, please refer to the description of the method.

[0076] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

[0077] It should be noted that the order in which the embodiments of the present application are presented is for illustrative purposes only and does not necessarily represent the superiority or inferiority of the embodiments. Furthermore, the foregoing descriptions of specific embodiments of this specification are provided. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order or sequential sequence shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0078] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

[0079] This specification and drawings are merely illustrative of the present application and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Obviously, those skilled in the art may make various modifications and variations to this application without departing from the scope of this application. Thus, this application is intended to include such modifications and variations as fall within the scope of this application and its equivalents.

Claims

1. C+L 400G optical line protection method, characterized in that: The method comprises: Call the operation log of the primary router to perform steady-state analysis of signal quality and output benchmark signal quality parameters; The monitoring unit collects the time-series optical signal of the backup route in real time based on a preset monitoring window, and outputs the attenuation difference between the primary and backup routes by comparing the time-series optical signal with the reference signal quality parameter; After receiving the primary and backup route attenuation difference, the communication unit performs gain compensation analysis based on the primary and backup route attenuation difference to obtain a dynamic gain compensation parameter; The backup route optical signal is separated into a C-band signal and an L-band signal by a wavelength splitting unit, and then enters a C-band dynamic gain adjustment unit and an L-band dynamic gain adjustment unit respectively; The C-band dynamic gain adjustment unit and the L-band dynamic gain adjustment unit receive and perform coordinated dynamic compensation of the C-band signal and the L-band signal according to the dynamic gain compensation parameter, and output a C-band optimized signal and an L-band optimized signal; The C-band optimized signal and the L-band optimized signal are combined into a C+L-band composite signal by a combining unit and then output to a target transmission link.

2. The C+L 400G optical line protection method according to claim 1, wherein: Calling the operation log of the primary router to perform steady-state signal quality analysis and outputting a reference signal quality parameter, the method includes: Retrieving the signal quality data of the primary route from the downstream relay station to obtain the operation log; The operation log is divided by sliding a preset steady-state analysis window to obtain multiple sliding window logs; Statistical feature calculations are performed based on multiple sliding window logs to obtain multiple C-band optical power steady-state averages, multiple C-band OSNR steady-state averages, multiple L-band optical power steady-state averages, and multiple L-band OSNR steady-state averages. The plurality of C-band optical power steady-state average values, the plurality of C-band OSNR steady-state average values, the plurality of L-band optical power steady-state average values, and the plurality of L-band OSNR steady-state average values ​​are time-sequentially weighted to output the reference signal quality parameter.

3. The C+L 400G optical line protection method according to claim 1, wherein: The C-band dynamic gain adjustment unit and the L-band dynamic gain adjustment unit receive and perform collaborative dynamic compensation of the C-band signal and the L-band signal according to the dynamic gain compensation parameter, and output a C-band optimized signal and an L-band optimized signal. The method includes: Outputting a signal abnormality level by quantifying the attenuation difference between the primary and backup routes; Matching a graded response mechanism and a graded adjustment scale according to the signal anomaly level; Matching the C multi-level coordinated adjustment instruction and the L multi-level coordinated adjustment instruction according to the C band compensation parameter and the L band compensation parameter in the dynamic gain compensation parameter; With the hierarchical adjustment scale as a constraint, the C multi-level collaborative adjustment instruction and the L multi-level collaborative adjustment instruction are executed based on the hierarchical response mechanism, the C-band signal and the L-band signal are collaboratively dynamically compensated, and the C-band optimized signal and the L-band optimized signal are output.

4. The C+L 400G optical line protection method according to claim 3, wherein: According to the signal anomaly level matching hierarchical response mechanism and hierarchical adjustment scale, the method includes: Interactively obtain multiple sample compensation priorities and multi-level compensation scales for multiple sample anomaly levels; After associating and storing the plurality of sample anomaly levels, the plurality of sample compensation priorities, and the multi-level compensation scales, equidistant disturbance expansion is performed to obtain a hierarchical compensation strategy library; The signal anomaly level is used to traverse the hierarchical compensation strategy library to perform level-up matching judgment, and the hierarchical response mechanism and hierarchical adjustment scale are output.

5. The C+L 400G optical line protection method according to claim 2, wherein: The reference signal quality parameters include C-band reference optical power, C-band reference OSNR, L-band reference optical power and L-band reference OSNR.

6. The C+L 400G optical line protection method according to claim 5, wherein: The monitoring unit collects the time sequence optical signal of the backup route in real time based on a preset monitoring window, and outputs the attenuation difference between the primary and backup routes by comparing the time sequence optical signal with the reference signal quality parameter. The method includes: Calculating a steady-state fluctuation interval based on the multiple C-band optical power steady-state average values, the multiple C-band OSNR steady-state average values, the multiple L-band optical power steady-state average values, and the multiple L-band OSNR steady-state average values, and outputting a reference signal fluctuation interval; After smoothing the timing optical signal using the reference signal fluctuation interval, the timing optical signal is compared with the reference signal quality parameter, and the primary and backup route attenuation difference is output, wherein the primary and backup route attenuation difference includes the C-band optical power attenuation difference, the C-band OSNR attenuation difference, the L-band optical power attenuation difference and the L-band OSNR attenuation difference. 7.C+L 400G optical line protection system, characterized by: The system is used to execute the C+L 400G optical line protection method according to any one of claims 1 to 6, and the system includes: Communication unit; The wavelength combination and decomposition module is used to separate the input optical signal into C-band signal and L-band signal, and supports signal merging; Optical power amplifier module; The optical power amplification module receives the dynamic gain compensation parameter sent by the communication unit, performs slope-gain coordinated compensation on the C-band signal and the L-band signal separated by the multiplexing / demultiplexing module, and outputs an optimized signal.

8. The C+L 400G optical line protection system according to claim 7, wherein: The wavelength combining and decomposing module is composed of a wavelength combining unit and a wavelength decomposing unit, and both the wavelength combining unit and the wavelength decomposing unit are WDM devices.

9. The C+L 400G optical line protection system according to claim 7, wherein: The optical power amplification module is composed of a C-band dynamic gain adjustment unit and an L-band dynamic gain adjustment unit.

10. A computer-readable storage medium, characterized in that The storage medium stores a computer program, which, when executed by a processor, implements the method steps according to any one of claims 1 to 6.

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