Control method for optical transmission emergency recovery unit based on raman fiber amplifier

Abstract

The application discloses an optical transmission emergency recovery unit control method based on a Raman fiber amplifier, and relates to the technical field of optical transmission.The method comprises the following steps: deploying an emergency recovery unit containing a Raman amplifier at a high-fault-node of an optical fiber network, covering each fault-probability node of the optical fiber network, monitoring the network state in real time and locating the fault node; constructing a gain matching cluster according to the spatial relationship between the nodes and the unit; and then decomposing the transmission task target of the fault node into emergency recovery parameters, calculating the optimal emergency recovery gain parameters of the Raman fiber amplifier by cooperatively quantizing and analyzing the cluster, and using the optimal emergency recovery gain parameters for link emergency recovery control. The technical problems of slow emergency recovery response, poor flexibility, low gain matching precision and insufficient multi-unit cooperative control capability in the prior art are solved, fast, accurate and adaptive link emergency recovery is achieved, and the technical effect of improving the reliability and survivability of the optical transmission network is achieved.

Description

Technical Field

[0001] This invention relates to the field of optical transmission technology, and in particular to a control method for an emergency recovery unit for optical transmission based on a Raman fiber amplifier. Background Technology

[0002] As a core component of modern communication infrastructure, fiber optic networks bear the ever-increasing demand for data transmission. However, fiber optic transmission systems are susceptible to various factors in actual operation, such as fiber aging, physical damage, and environmental interference, leading to frequent network link failures, especially at certain critical nodes. If a failure occurs and is not promptly restored, it can result in serious consequences such as communication interruption and data loss. Traditional emergency recovery methods for optical transmission mainly rely on redundant link switching or amplification compensation mechanisms based on erbium-doped fiber amplifiers (EDBFAs). These methods suffer from limitations such as slow response speed, insufficient flexibility, and low gain matching accuracy. For example, the gain characteristics of EDBFAs, a common type of optical amplifier, are limited by fixed energy level transitions, making it difficult to achieve dynamic adaptive adjustment in complex and changing network environments. Furthermore, current emergency recovery methods for optical transmission lack real-time analysis and collaborative control capabilities of the network status, resulting in low emergency recovery efficiency and failing to meet the requirements of modern high-reliability optical transmission networks.

[0003] Current technologies suffer from technical problems such as slow emergency recovery response, poor flexibility, low gain matching accuracy, and insufficient multi-unit collaborative control capabilities. Summary of the Invention

[0004] This application provides a control method for an optical transmission emergency recovery unit based on a Raman fiber amplifier, which solves the technical problems of slow emergency recovery response, poor flexibility, low gain matching accuracy, and insufficient multi-unit collaborative control capability in the prior art. It achieves fast, accurate, and adaptive link emergency recovery, thereby improving the reliability and survivability of the optical transmission network.

[0005] This application provides a control method for an optical transmission emergency recovery unit based on a Raman fiber amplifier. The method includes: deploying multiple emergency recovery units on an optical fiber network to cover each fault probability node of the optical fiber network, wherein each emergency recovery unit includes a Raman fiber amplifier; monitoring the signal quality of the network links in real time and analyzing the optical transmission network status; locating emergency link nodes using the optical transmission network status; analyzing the gain relationship using the spatial relationship between the emergency location nodes and the emergency recovery units to construct a gain matching cluster; decomposing the transmission tasks of the emergency location nodes to construct emergency recovery parameter targets; and performing collaborative quantization analysis on the gain matching cluster to maximize the emergency recovery parameter targets, thereby determining the emergency recovery gain parameters of the Raman fiber amplifier for link emergency recovery control.

[0006] In a possible implementation, the Raman fiber amplifier-based optical transmission emergency recovery unit control method further performs the following processing: disassembling the key nodes of the optical fiber network, constructing a network topology, and dividing the network nodes into multiple sub-regions, each sub-region corresponding to an emergency recovery unit; analyzing the probability of link failure based on abnormal fault data in optical fiber transmission, and mapping the failure probability to key nodes in the optical fiber network topology; and analyzing the deployment strategy of the emergency recovery unit based on the failure probability analysis results to cover the area with the highest failure probability in the optical fiber network, optimizing the distribution location of the emergency recovery unit for deployment.

[0007] In a possible implementation, the control method for the optical transmission emergency recovery unit based on the Raman fiber amplifier further performs the following processing: calculating the fault impact range of each node according to the optical fiber network topology and the fault probability of the nodes; optimizing the deployment location of the emergency recovery unit through an optimization algorithm to ensure that the area with the highest fault probability is given priority coverage; and dynamically adjusting the deployment of the emergency recovery unit based on the optimization results to respond in real time to changes in network status and fault probability.

[0008] In a possible implementation, the control method for the optical transmission emergency recovery unit based on the Raman fiber amplifier further performs the following processing: matching the link requirement parameters of the optical transmission task with the status parameters corresponding to the optical transmission network status to identify the deviation transmission parameters; and locating the emergency node based on the monitoring location of the deviation transmission parameters combined with the time-series change characteristics of the parameters to obtain the emergency location node.

[0009] In a possible implementation, the control method for the optical transmission emergency recovery unit based on the Raman fiber amplifier further performs the following processing: based on the distribution location of the emergency positioning nodes and the emergency recovery units, analyze the gain adjustment requirements and determine the recovery gain of each node; based on the gain optimization algorithm of collaborative filtering, perform gain coordination among the various emergency recovery units to ensure that the gain distribution of the entire optical fiber network is optimized, avoid excessive gain or insufficient gain of the emergency positioning nodes, and obtain the gain matching cluster.

[0010] In a possible implementation, the Raman fiber amplifier-based optical transmission emergency recovery unit control method further performs the following processing: locating the emergency recovery overlapping response area based on the distribution locations of the emergency positioning nodes and the emergency recovery units; analyzing the emergency recovery response relationship of the emergency positioning nodes according to the emergency recovery overlapping response area; and configuring the regional overlapping gain of the corresponding emergency recovery units based on the emergency recovery response relationship to determine the gain matching cluster.

[0011] In a possible implementation, the control method for the optical transmission emergency recovery unit based on the Raman fiber amplifier further performs the following processing: decomposing multiple specific target parameters based on the transmission task, including at least signal power, bit error rate, delay target, and wavelength target; according to the cooperative recovery relationship of the gain matching cluster for the emergency positioning node, combined with link loss, transmission requirements, wavelength characteristics, and the priority of the recovery task, configuring the target parameters in response, and determining the emergency recovery parameter target of the emergency recovery unit.

[0012] In a possible implementation, the control method for the optical transmission emergency recovery unit based on the Raman fiber amplifier further performs the following processing: when the optical fiber network is in a stable and healthy state, at one or more preset backtracking timing nodes in the optical fiber network, at least one quality parameter of the communication signal is continuously monitored and recorded, the quality parameter including optical power, optical signal-to-noise ratio and bit error rate; based on the monitoring data of the quality parameters, a health cycle signal reference representing the normal state of the signal is generated, and the health cycle signal reference is stored in the backtracking timing node.

[0013] In a possible implementation, the control method for the optical transmission emergency recovery unit based on the Raman fiber amplifier further performs the following processing: based on the transmission signal after emergency recovery, acquiring real-time quality parameters of the signal flowing through the backtracking timing node; retrieving the health cycle signal reference from the memory; comparing the real-time quality parameters with the health cycle signal reference to determine whether the real-time quality parameters are within the normal range defined by the health cycle signal reference; if the determination result is yes, then the emergency recovery is confirmed to be successful, and the network enters a stable operation transmission state.

[0014] In a possible implementation, the control method for the optical transmission emergency recovery unit based on the Raman fiber amplifier further performs the following processing: when the determination result is negative, the pump power and gain configuration of the Raman fiber amplifier are dynamically fine-tuned based on the difference between the real-time quality parameter and the health cycle signal reference; after the adjustment is completed, based on the adjacency relationship of the emergency positioning node, the backtracking timing node related to the recovery path is selected for backtracking verification again until the recovery signal quality meets the health cycle signal reference.

[0015] This application proposes a control method for emergency recovery units based on Raman fiber amplifiers in optical transmission. This method deploys emergency recovery units containing Raman amplifiers at high-fault nodes in the optical fiber network, covering all fault-probability nodes and monitoring network status and locating faulty nodes in real time. A gain-matching cluster is constructed based on the spatial relationship between nodes and units. The transmission task objective of the faulty node is then decomposed into emergency recovery parameters. Through collaborative quantization analysis of the cluster, the optimal emergency recovery gain parameters of the Raman fiber amplifier are calculated for link emergency recovery control. This method solves the technical problems of slow emergency recovery response, poor flexibility, low gain matching accuracy, and insufficient multi-unit collaborative control capabilities in existing technologies. It achieves fast, accurate, and adaptive link emergency recovery, improving the reliability and survivability of optical transmission networks. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Flowcharts are used in this application to illustrate the operations performed by the system according to the embodiments of the present application. It should be understood that the preceding or following operations are not necessarily performed precisely in sequence. Instead, various steps can be processed in reverse order or simultaneously as needed. Furthermore, other operations can be added to these processes, or one or more steps can be removed from these processes.

[0017] Figure 1 This is a flowchart illustrating the control method for an emergency recovery unit of optical transmission based on a Raman fiber amplifier, as provided in an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the process for constructing a gain-matching cluster in the control method for an emergency recovery unit based on a Raman fiber amplifier provided in the embodiments of this application. Detailed Implementation

[0019] To further illustrate the technical means and effects adopted by the present invention in order to achieve the intended purpose, the following detailed description is provided in conjunction with the accompanying drawings and preferred embodiments, based on the specific implementation methods, structures, features and effects of the present invention.

[0020] This application provides a control method for an emergency recovery unit for optical transmission based on a Raman fiber amplifier, such as... Figure 1 As shown, the method includes: Step S100: Deploy multiple emergency recovery units on the optical fiber network to cover each fault probability node of the optical fiber network, wherein the emergency recovery unit includes a Raman fiber amplifier.

[0021] Preferably, the fiber optic network consists of fiber optic links, switches, routers, repeaters, amplifiers, and other equipment. Signals are transmitted in the form of light within this network. The network identifies and determines nodes with a higher probability of failure—geographical or logical points where failures are more likely to occur or have a more severe impact—including at least the middle section of long-distance links, the ends of long-span links, hub nodes in the network topology, and areas with harsh environments. Then, multiple emergency recovery units are deployed on the fiber optic network to immediately activate upon detection of network link performance degradation or failure, compensating for and repairing the optical signal to restore normal communication quality. The protection scope of the emergency recovery units is effectively defined. For fault probability nodes, the Raman fiber amplifier is the core functional component of the emergency recovery unit, which includes one or more wavelength pump lasers, multiplexers, signal / pump multiplexers, and isolators. The hardware composition of the emergency recovery unit also includes at least an optical performance monitoring component for collecting signal quality parameters such as optical power, optical signal-to-noise ratio, and bit error rate. The control unit adopts an ARM or FPGA architecture for performing gain calculation and adjustment. The communication interface supports SNMP or NETCONF protocols for interacting with the network management system. The emergency recovery unit is also equipped with a backup power supply or low-power design to ensure that it can maintain at least 30 minutes of operation when the main power is interrupted.

[0022] Preferably, by injecting high-power "pump light" into the transmission optical fiber, the energy is transferred from the pump light to the transmitted signal light using the "stimulated Raman scattering" effect of the fiber itself, thereby achieving distributed amplification. The signal light gains gain throughout the entire fiber transmission process. When the link attenuation increases due to a fault, the Raman fiber amplifier can provide additional gain to increase the signal power. At the same time, it has a lower noise figure, which can effectively improve the purity of the signal. Furthermore, by configuring pump sources of different wavelengths, it can adapt to signals of different channels and achieve flexible gain configuration.

[0023] Furthermore, step S100 also includes step S110, which involves disassembling the key nodes of the optical fiber network, constructing a network topology, and dividing the network nodes into multiple sub-regions, each sub-region corresponding to an emergency recovery unit; step S120, which involves analyzing the probability of link failure based on abnormal fault data in optical fiber transmission and mapping the failure probability to the key nodes in the optical fiber network topology; and step S130, which involves analyzing the deployment strategy of the emergency recovery unit based on the analysis results of the failure probability, in order to cover the area with the highest failure probability in the optical fiber network and optimize the distribution location of the emergency recovery unit for deployment.

[0024] Preferably, the fiber optic network is disassembled into key nodes, and information such as the geographical location, connection relationships, and physical parameters of network devices and fiber optic links, including optical amplifiers, switching nodes, and routing nodes, is collected to establish the network topology of the fiber optic network. This topology describes all possible paths of the signal from the origin to the destination. Based on the network topology, geographical proximity, or management boundaries, the entire fiber optic network is divided into multiple sub-regions, and a corresponding emergency recovery unit is assigned to each sub-region as the first responder for that region, achieving localized fault management and recovery. Abnormal fault data based on fiber optic transmission is extracted from the historical operation records of the fiber optic network. This includes the time, location, and duration of historical interruption events; performance alarm logs such as low optical power, deteriorated optical signal-to-noise ratio, and soaring bit error rate; equipment lifecycle data; and external environmental data such as construction activities and natural disaster records.

[0025] Preferably, regression analysis, time series analysis, or a fault prediction and health management (PHM) model are used to analyze abnormal fault data and calculate the quantitative probability of different optical fibers, connectors, or equipment parts in the optical fiber network failing within a specific time in the future, which is taken as the probability of link failure. Then, the failure probability is used as an attribute label and mapped to the corresponding key nodes in the optical fiber network topology to generate the analysis results of the failure probability, that is, to determine the network topology in the form of a heat map, so as to clearly distinguish the failure risk of different link nodes.

[0026] Preferably, the deployment strategy of emergency recovery units is analyzed based on the failure probability analysis results. That is, the network topology with failure probability labels is input, and given a limited number of emergency recovery units, the specific deployment location that maximizes the risk coverage benefit of the entire network is selected. Specifically, a greedy algorithm is used for facility site selection. The cost function is constructed with the area with the highest failure probability in the fiber optic network as the optimization objective. The optimal distribution location of the emergency recovery units is calculated and used for emergency recovery unit deployment to achieve reasonable resource allocation.

[0027] Furthermore, step S130 also includes step S131, calculating the fault impact range of each node based on the fiber optic network topology and the fault probability of the nodes; step S132, optimizing the deployment location of the emergency recovery unit through an optimization algorithm to ensure that the area with the highest fault probability is given priority coverage, and dynamically adjusting the deployment of the emergency recovery unit based on the optimization results to respond in real time to changes in network status and fault probability.

[0028] Preferably, the scope of impact of a fault refers to the breadth and depth of service interruption caused by a node failure. It is determined based on the fiber optic network topology and the probability of node failure and may include the number of affected services, the level of affected users, the difficulty and time of recovery, and the geographical coverage. Specifically, based on the constructed fiber optic network topology, a fault simulation is performed, a target node or a link is virtually shut down, a routing algorithm is run to analyze the relevant cut communication paths, and the impact score is calculated by comprehensively analyzing the path, service priority, and other data, which represents the scope of impact of the node's fault.

[0029] Preferably, the deployment locations of emergency recovery units are optimized using the failure probability of all nodes, the scope of failure impact, the number of emergency recovery units, and the technical coverage area as inputs. This is achieved through greedy algorithms or genetic algorithms. The technical coverage area includes the effective range of the Raman amplifier, aiming to minimize the overall network risk and ensure priority coverage of areas with the highest failure probability. The overall risk is the sum of the products of the failure probability and the scope of failure impact of all nodes. The optimization process determines an emergency recovery unit deployment scheme that maximizes the sum of the failure probability and impact area of ​​the covered nodes, thus maximizing the protection of nodes crucial to network stability. Nodes with high failure probabilities and large failure impact areas receive high weights. Finally, the deployment of emergency recovery units is dynamically adjusted based on the optimization results to respond in real-time to changes in network status and failure probabilities. For example, based on real-time risk, units in standby mode are prioritized for activation, or their gain configuration is dynamically adjusted to focus on protecting the most dangerous areas.

[0030] Step S200: Monitor the signal quality of the network link in real time and analyze the status of the optical transmission network.

[0031] Preferably, multiple key indicators of the network link are monitored in real time by an optical performance monitoring unit embedded in an optical amplifier, optical switch, or independent site to assess signal quality and determine the status of the optical transmission network. Specifically, the optical power of the signal is measured at the amplifier input / output end and the receiver end of the link to determine whether the signal is excessively attenuated due to fiber bending, connector degradation, device aging, etc.; the ratio of signal optical power to background noise power is measured to determine the optical signal-to-noise ratio (SNR) to identify noise degradation introduced by amplifiers, nonlinear effects, or crosstalk; the bit error rate (BER) is determined by directly calculating the ratio of the number of erroneous bits at the receiver to the total number of bits, and the Q factor, a quality parameter related to BER, is calculated by measuring the statistical distribution of signal level and noise, directly reflecting whether the link can transmit data accurately; parameters such as the center wavelength and power flatness of each channel are monitored to detect wavelength drift caused by temperature changes or device instability; and the power loss difference caused by signal polarization state changes is measured to identify polarization-sensitive effects caused by optical fibers or optical devices. Then, the measurement data of network link signal quality are comprehensively analyzed. The real-time monitored parameter values ​​are compared with the preset alarm thresholds and fault thresholds to analyze the optical transmission network status. When the parameters start to deviate from the optimal value but have not yet affected the service, an early warning is issued. When the parameters exceed the threshold, it indicates that the performance is seriously degraded and may cause service interruption, so an alarm is issued.

[0032] Step S300: Use the status of the optical transmission network to locate emergency link nodes, and use the spatial relationship between the emergency location nodes and the emergency recovery unit to analyze the gain relationship and construct a gain matching cluster.

[0033] Furthermore, such as Figure 2 As shown, step S300 further includes step S310, which matches the link requirement parameters of the optical transmission task with the status parameters corresponding to the optical transmission network status to identify the deviation transmission parameters; step S320, which locates the emergency node based on the monitoring location of the deviation transmission parameters and the time-series change characteristics of the parameters to obtain the emergency location node.

[0034] Preferably, the link requirement parameters for the optical transmission task are obtained, which are the preset health standards or target values ​​to ensure the normal transmission of specific optical channel services. These include target optical power, minimum optical signal-to-noise ratio tolerance, maximum bit error rate threshold, and wavelength stability requirements. Then, the link requirement parameters for the optical transmission task are compared one by one with the corresponding optical transmission network status parameters to identify deviation transmission parameters that deviate from the normal range. Next, the monitoring location of the deviation transmission parameters is obtained, that is, the specific monitoring point in the fiber optic network topology is used as the fault point, which is usually located between the first monitoring node that has an anomaly and its upstream normal monitoring node. The temporal change characteristics determine the specific characteristics of the deviation's evolution over time. For example, abrupt / cliff-like drops indicate physical damage, such as fiber being cut or connectors being completely detached; gradual / gradual degradation indicates progressive faults, such as connector contamination, laser aging, and temperature drift; jitter / intermittent anomalies may indicate external interference, power instability, or microbending. Then, by combining the time-series change characteristics of parameters and the monitoring location of deviation transmission parameters, emergency node location is performed. That is, based on the location of the monitoring point where the anomaly occurs in the network topology, the fault range is narrowed down to the link between two adjacent monitoring points. Then, by combining the time pattern of the anomaly occurrence, the fault type is further determined, and finally the emergency location node is obtained.

[0035] Furthermore, step S300 also includes step S330, which analyzes the gain adjustment requirements based on the distribution locations of the emergency positioning nodes and the emergency recovery units, and determines the recovery gain of each node; step S340, which performs gain coordination among the emergency recovery units based on a collaborative filtering gain optimization algorithm to ensure that the gain distribution of the entire optical fiber network is optimized, avoids excessive or insufficient gain of the emergency positioning nodes, and obtains the gain matching cluster.

[0036] Preferably, the spatial relationship between emergency location nodes and emergency recovery units is used to analyze the gain relationship. Specifically, each fault point or node in the fiber optic network requires a specific gain, i.e., signal enhancement, during recovery. Based on the location of each emergency recovery unit and the link area it is responsible for, the gain required for each node during recovery is analyzed. Then, an initial independent gain setting value is calculated for each emergency recovery unit. Areas farther from the fault point may require more gain to compensate for signal attenuation, while areas closer to the recovery unit may only require a small amount of gain. That is, distributed Raman amplification is needed for signal-to-noise ratio degradation, and centralized amplification is needed for power reduction. Finally, the recovery gain of each node is determined, and a preliminary gain configuration list is output.

[0037] Preferably, a gain optimization algorithm based on collaborative filtering is used to perform gain coordination among various emergency recovery units. Collaborative filtering is an optimization algorithm, similar to "user collaborative filtering" in recommendation systems. In gain optimization, it coordinates and optimizes the gain based on the working status and needs of each emergency recovery unit. Specifically, the collaborative filtering algorithm determines the gain value of each emergency recovery unit based on its gain requirements and location relationships, and coordinates the gains between different units to ensure optimal gain distribution across the entire fiber optic network. This avoids excessive or insufficient gain at emergency positioning nodes. For example, if the gain of a recovery unit is set too high, it may lead to unstable signal quality or even introduce noise; if the gain is too low, the signal may not be fully restored. The goal is to obtain an efficient and stable gain-matching cluster. For example, let G = {g1, g2, ..., gn} be the gain values ​​of each emergency recovery unit, and let S = {s1, s2, ..., sm} be the recovery requirements of the emergency positioning nodes. The objective function is... ,in, Let f be the spatial weight, and let f be the gain adaptation function. Gain recommendation is performed using historical fault recovery data or similar node behavior.

[0038] Preferably, let the set of emergency positioning nodes be N, the set of emergency recovery units be R, and define the gain matching matrix M∈ ,in, Let represent the gain contribution of the i-th emergency recovery unit to the j-th emergency location node. The collaborative filtering gain optimization algorithm calculates the similarity between nodes sim(j,k) based on historical fault recovery data and predicts the gain values ​​of nodes that are not directly matched. in, The set of K nodes with the highest similarity to node j is used to find the optimal gain configuration through gradient descent, thereby maximizing the overall signal recovery quality.

[0039] Furthermore, step S340 also includes step S341, locating the emergency recovery overlapping response area based on the distribution locations of the emergency positioning nodes and the emergency recovery units; step S342, parsing the emergency recovery response relationship of the emergency positioning nodes according to the emergency recovery overlapping response area; and step S343, configuring the regional overlap gain of the corresponding emergency recovery units based on the emergency recovery response relationship to determine the gain matching cluster.

[0040] Preferably, in actual deployment of emergency recovery units, the coverage area of ​​each unit is limited, and multiple emergency recovery units may have some overlapping areas to ensure rapid recovery in the event of a fiber optic link failure. That is, the coverage areas of multiple emergency recovery units partially overlap. Then, based on the distribution locations of emergency positioning nodes and emergency recovery units, the overlapping response area of ​​emergency recovery is located. This overlapping response area is the fiber optic section where a single emergency recovery unit, through its pump light injection, can effectively provide gain and affect signal quality. The overlapping response area is the response area where multiple emergency recovery units in the network intersect in physical space. Then, based on the overlapping response area, the emergency recovery response relationship of the emergency positioning nodes is analyzed, i.e., the analysis is performed when a fault occurs. When a fault occurs in an overlapping area, the relative position of the fault location node to each emergency recovery unit in the overlapping area is determined based on its specific location. The interaction relationships between the emergency recovery units are then determined, which may include master-slave relationships, cooperative relationships, and potential conflict relationships. Finally, based on the emergency recovery response relationship, the regional overlapping gain configuration of the corresponding emergency recovery units is performed. That is, based on signal quality feedback and recovery requirements, the emergency recovery unit that performs master control adjustment or multiple recovery units working in concert is intelligently selected. At the same time, the gain of each recovery unit is dynamically adjusted, and the gain allocation strategy is determined through optimization algorithms to ensure the best signal recovery effect in the overlapping area. A highly optimized gain matching cluster for faults in specific overlapping areas is determined.

[0041] Step S400: Decompose the transmission task of the emergency positioning node into a target, construct an emergency recovery parameter target, and perform collaborative quantization analysis on the gain matching cluster by maximizing the emergency recovery parameter target to determine the emergency recovery gain parameter of the Raman fiber amplifier for link emergency recovery control.

[0042] Step S400 further includes step S410, which decomposes multiple specific target parameters based on the transmission task, including at least signal power, bit error rate, delay target, and wavelength target; step S420, which, based on the cooperative recovery relationship of the gain matching cluster for the emergency positioning node, and combined with the link loss, transmission requirements, wavelength characteristics, and priority of the recovery task, configures the target parameters in response to determine the emergency recovery parameter target of the emergency recovery unit.

[0043] Preferably, the transmission task of the emergency positioning node refers to the specific service carried on the optical fiber link. This task is decomposed into multiple specific target parameters. Different services have different requirements for the physical layer. The transmission task is decomposed into performance indicators such as signal power, bit error rate, latency target, and wavelength drift target. Among these, the signal power target ensures that the optical power at the receiving end is within the optimal range. and Between these two values, the bit error rate target is used to measure transmission accuracy, i.e., the bit error rate target ≤ The time delay target refers to the propagation delay inherent in optical signal transmission within optical fiber, further compounded by the slight processing delay introduced by amplifier response and configuration. The wavelength drift target refers to ensuring the stable wavelength of the recovered signal in a wavelength division multiplexing system without drift to avoid interfering with adjacent channels. .

[0044] Preferably, the emergency recovery units within the gain-matching cluster have a primary and secondary division of labor, and service objectives are assigned to different units within the cluster. For example, to meet strict bit error rate targets, the upstream Raman unit needs to operate in a distributed amplification mode; to quickly meet signal power targets, the downstream unit needs to provide rapid centralized gain. Link loss and transmission requirements include the current attenuation value of the faulty link, as well as the total link length, fiber type, etc. Wavelength characteristics refer to the fact that the gain of the Raman amplifier is closely related to the wavelength difference between the pump light and the signal light. The priority of recovery tasks refers to the fact that multiple faults may occur simultaneously in the network, and the importance of different services varies. Furthermore, by combining the collaborative recovery relationship of the gain matching cluster for emergency positioning nodes, the target parameters are configured in response to determine the emergency recovery parameter targets of the emergency recovery units. Specifically, link loss and transmission requirements are used as the direct basis for calculating the total gain requirement. If the link loss increases by 5dB, the total gain provided by all units must compensate by 5dB, with sufficient margin reserved according to transmission requirements. The power of pump sources of different wavelengths is accurately calculated and set to achieve the power flatness of the wavelength target. For example, for the C-band, multiple pump lasers of different wavelengths are activated simultaneously, and their respective powers are adjusted to achieve the balance of channel gain across the entire band. The priority of the recovery task determines the degree of resource allocation. For high-priority tasks, the gain matching cluster may be ordered to achieve the target at all costs, for example, allowing the temporary use of higher pump power to ensure that the latency and bit error rate targets are achieved first. For low-priority tasks, a conservative "best-effort" strategy may be adopted to perform recovery without deteriorating other parts of the network.

[0045] Preferably, a physical transmission model is established that includes the fiber optic link, the fault point, and all emergency recovery units within the gain-matching cluster. This model can simulate the changes in optical signal transmission, attenuation, and amplification by the Raman amplifier in the fiber optic cable. The gain-matching cluster is then analyzed collaboratively to maximize the emergency recovery parameter objective. This involves treating the gain parameters of all emergency recovery units as a unified variable vector simultaneously, while also considering the mutual influence between different emergency recovery units. For example, increasing the gain of unit X will cause a change in the input power of unit Y, thus affecting the optimal operating point of unit Y. A gradient descent method or genetic algorithm is used to simulate and search within the model, trying various combinations of gain parameters within the allowed configuration space. Finally, the set of gain parameters that maximizes the emergency recovery parameter objective is selected and determined as the emergency recovery gain parameter of the Raman fiber amplifier. The power of the pump laser can be adjusted according to the emergency recovery gain parameter, thereby precisely changing its amplification capability of the optical signal, ultimately achieving precise, efficient, and safe emergency recovery control of the faulty link.

[0046] Furthermore, the control method for the optical transmission emergency recovery unit based on the Raman fiber amplifier also includes, when the optical fiber network is in a stable and healthy state, continuously monitoring and recording at least one quality parameter of the communication signal at one or more preset backtracking timing nodes in the optical fiber network, the quality parameter including optical power, optical signal-to-noise ratio and bit error rate; based on the monitoring data of the quality parameters, generating a health cycle signal reference representing the normal state of the signal, and storing the health cycle signal reference in the backtracking timing node.

[0047] Preferably, when the fiber optic network is in a stable and healthy state, one or more backtracking time-series nodes with monitoring and storage functions are preset at the intersection points of critical service paths in the fiber optic network. These nodes may be located on critical service paths, at the boundaries of network areas, or at the ends of long-distance links, with at least one node set every 100km, forming a baseline monitoring network. These nodes also possess storage and computing capabilities and are responsible for capturing the network's health status at different locations and ensuring the recording of an ideal, anomaly-free fiber optic network operation. They continuously monitor and record at least one quality parameter of the communication signal, including optical power, optical signal-to-noise ratio, and bit error rate, to capture the periodic variation characteristics of the fiber optic network. Then, based on the monitoring data of the quality parameters, the inherent patterns of the fiber optic network are identified by analyzing long-term historical data. For example, due to temperature changes, optical power and optical signal-to-noise ratio may fluctuate slightly and regularly during the day and night; the flow rate differs between working and resting times, which may cause small but regular changes in the bit error rate. During 7 consecutive days of stable operation, optical power, OSNR, and BER are collected every 5 minutes, and their mean and standard deviation are calculated. A healthy cycle signal benchmark representing the normal state of the signal is generated for each monitoring point, that is, a healthy cycle signal range, such as mean optical power ±2σ, mean optical signal-to-noise ratio -σ, and mean +σ. Finally, the healthy cycle signal benchmark is stored in the backtracking time sequence node to achieve accurate recovery verification. For example, a slight drop in normal power during the day will not be misjudged as a fault, thereby avoiding unnecessary recovery actions and improving stability.

[0048] Furthermore, the control method for the optical transmission emergency recovery unit based on the Raman fiber amplifier also includes: acquiring real-time quality parameters of the signal flowing through the backtracking timing node based on the transmission signal after emergency recovery; retrieving the health cycle signal reference from the memory; comparing the real-time quality parameters with the health cycle signal reference to determine whether the real-time quality parameters are within the normal range defined by the health cycle signal reference; and confirming that the emergency recovery is successful and the network enters a stable transmission state when the determination result is yes.

[0049] Preferably, after the emergency recovery command is issued and the Raman amplifier operates according to the calculated gain parameters, the monitoring unit deployed on the backtracking timing node is restarted to collect the real-time quality parameters of the optical signal flowing through the node. That is, the real-time signal quality parameters such as optical power, optical signal-to-noise ratio, and bit error rate are measured again. The health cycle signal benchmark established during the network health period is retrieved from the memory, and the real-time quality parameters are compared with the health cycle signal benchmark. It is checked whether each quality parameter is within the normal fluctuation range defined by its corresponding health benchmark. When the comparison result is yes, the emergency recovery action is officially confirmed to be successful, the network management state is switched from emergency recovery to stable operation and transmission state, and the log of this fault and successful recovery is recorded, thereby ensuring the signal recovery quality and stability.

[0050] Furthermore, the control method for the optical transmission emergency recovery unit based on the Raman fiber amplifier also includes, when the determination result is negative, dynamically fine-tuning the pump power and gain configuration of the Raman fiber amplifier based on the difference between the real-time quality parameter and the health cycle signal reference; after the adjustment is completed, based on the adjacency relationship of the emergency positioning node, selecting the backtracking timing node related to the recovery path to perform backtracking verification again, until the recovery signal quality meets the health cycle signal reference.

[0051] Preferably, if the determination result is negative, it means that although the recovery operation improved the signal quality, it did not fully return to the normal range defined by the healthy cycle signal reference. In this case, the difference between the real-time quality parameters and the healthy reference is accurately calculated. A proportional-integral-derivative controller is used to convert the difference in quality parameters into a specific adjustment amount for the pump power of the Raman fiber amplifier, i.e., to control the feedback signal. This allows for dynamic fine-tuning of the pump power and gain configuration of the Raman fiber amplifier. Specifically, if the optical signal-to-noise ratio is too low, the pump power of the dominant recovery unit is appropriately increased; if the optical power is too high, the gain of the downstream unit is appropriately reduced. After the adjustment is completed, the nearest backtracking timing node downstream of the fault point is taken as the primary verification point. The verification is extended downstream of the network based on the adjacency relationship of the emergency positioning node to determine the extended verification point. Backtracking verification is performed again to ensure that the recovery effect is not only good near the fault point but can also be transmitted along the entire recovery path. The dynamic fine-tuning of the amplifier configuration and the selection of nodes for backtracking verification are repeated until the recovered signal quality meets the healthy cycle signal reference, thereby ensuring recovery quality, stability, and connectivity.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A control method for an emergency recovery unit of optical transmission based on a Raman fiber amplifier, characterized in that, include: Multiple emergency recovery units are deployed on the optical fiber network to cover each fault probability node of the optical fiber network, wherein the emergency recovery unit includes a Raman fiber amplifier; Real-time monitoring of network link signal quality and analysis of optical transmission network status; Emergency link node location is performed using the status of the optical transmission network; gain relationship analysis is performed using the spatial relationship between the emergency location node and the emergency recovery unit; and a gain matching cluster is constructed. The transmission task of the emergency positioning node is decomposed into a target, and an emergency recovery parameter target is constructed. The gain matching cluster is then quantized and analyzed in a coordinated manner to maximize the emergency recovery parameter target and determine the emergency recovery gain parameter of the Raman fiber amplifier for link emergency recovery control.

2. The control method for the optical transmission emergency recovery unit based on a Raman fiber amplifier according to claim 1, characterized in that, Multiple emergency recovery units are deployed on the fiber optic network, including: The fiber optic network is disassembled into key nodes, a network topology is constructed, and the network nodes are divided into multiple sub-regions, each sub-region corresponding to an emergency recovery unit. Based on abnormal fault data in optical fiber transmission, the probability of link failure is analyzed and mapped to key nodes in the optical fiber network topology. Based on the analysis of failure probability, the deployment strategy of emergency recovery units is analyzed to cover the areas with the highest failure probability in the fiber optic network and optimize the distribution location of emergency recovery units for deployment.

3. The control method for the optical transmission emergency recovery unit based on a Raman fiber amplifier according to claim 2, characterized in that, To optimize the distribution of emergency recovery units to cover areas with the highest probability of failure in the fiber optic network, including: Based on the fiber optic network topology and the failure probability of the nodes, calculate the failure impact range of each node; The deployment location of emergency recovery units is optimized by using optimization algorithms to ensure that areas with the highest failure probability are given priority coverage. The deployment of emergency recovery units is dynamically adjusted based on the optimization results to respond in real time to changes in network status and failure probability.

4. The control method for the optical transmission emergency recovery unit based on a Raman fiber amplifier according to claim 2, characterized in that, Emergency link node location is performed using the optical transmission network status, including: Based on the link requirement parameters of the optical transmission task, the state parameters corresponding to the optical transmission network state are matched to identify the deviation transmission parameters. Based on the monitoring location of the deviation transmission parameters and the time-series change characteristics of the parameters, emergency node positioning is performed to obtain the emergency positioning node.

5. The control method for the optical transmission emergency recovery unit based on a Raman fiber amplifier according to claim 2, characterized in that, The construction of the gain matching cluster includes: Based on the distribution locations of the emergency positioning nodes and the emergency recovery units, the gain adjustment requirements are analyzed, and the recovery gain of each node is determined. A gain optimization algorithm based on collaborative filtering is used to perform gain coordination among various emergency recovery units to ensure optimal gain distribution across the entire fiber optic network, avoid excessive or insufficient gain at emergency location nodes, and obtain the gain-matching cluster.

6. The control method for the optical transmission emergency recovery unit based on a Raman fiber amplifier according to claim 5, characterized in that, Also includes: Based on the distribution locations of the emergency positioning nodes and the emergency recovery units, the overlapping response area for emergency recovery is located; Based on the aforementioned overlapping emergency recovery response area, the emergency recovery response relationship of the emergency location nodes is analyzed; Based on the emergency recovery response relationship, the corresponding emergency recovery unit's regional overlapping gain is configured to determine the gain matching cluster.

7. The control method for the optical transmission emergency recovery unit based on a Raman fiber amplifier according to claim 5, characterized in that, The emergency recovery parameter target is constructed by decomposing the transmission task of the emergency positioning node, including: Based on the transmission task, multiple specific target parameters are decomposed, including at least signal power, bit error rate, delay target, and wavelength target; Based on the collaborative recovery relationship of the gain matching cluster for the emergency positioning node, and combined with the link loss, transmission requirements, wavelength characteristics, and priority of the recovery task, the target parameters are configured to determine the emergency recovery parameter target of the emergency recovery unit.

8. The control method for the optical transmission emergency recovery unit based on a Raman fiber amplifier according to claim 1, characterized in that, Also includes: When the optical fiber network is in a stable and healthy state, at one or more preset backtracking timing nodes in the optical fiber network, at least one quality parameter of the communication signal is continuously monitored and recorded. The quality parameter includes optical power, optical signal-to-noise ratio and bit error rate. Based on the monitoring data of quality parameters, a healthy cycle signal benchmark representing the normal state of the signal is generated, and the healthy cycle signal benchmark is stored in the backtracking time sequence node.

9. The control method for the optical transmission emergency recovery unit based on a Raman fiber amplifier according to claim 8, characterized in that, After determining the emergency recovery gain parameters of the Raman fiber amplifier, the following is included: Based on the transmission signal after emergency recovery, real-time quality parameters of the signal flowing through the backtracking time sequence node are collected. Recall the health cycle signal reference from memory; The real-time quality parameters are compared with the health cycle signal benchmark to determine whether the real-time quality parameters are within the normal range defined by the health cycle signal benchmark. If the determination result is yes, the emergency recovery is confirmed to be successful, and the network enters a stable transmission state.

10. The control method for the optical transmission emergency recovery unit based on a Raman fiber amplifier according to claim 9, characterized in that, After determining whether the real-time quality parameter is within the normal range defined by the benchmark, the method further includes: If the determination result is negative, the pump power and gain configuration of the Raman fiber amplifier are dynamically fine-tuned based on the difference between the real-time quality parameters and the health cycle signal reference. After the adjustment is completed, based on the adjacency relationship of the emergency positioning nodes, backtracking time sequence nodes related to the recovery path are selected for backtracking verification again until the quality of the recovered signal meets the health cycle signal benchmark.

Images