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CN-120768444-B - Intelligent switching and attenuation prediction system for armored optical fiber transmission path

CN120768444BCN 120768444 BCN120768444 BCN 120768444BCN-120768444-B

Abstract

The invention relates to an armored optical fiber transmission path intelligent switching and attenuation prediction system which comprises a transmission domain construction module, an interference situation analysis module, a path switching decision module and a database. And selecting a main path and a standby path, establishing a reference based on the attenuation ratio proportion in the interference-free state by taking the attenuation ratio of the signal to noise ratio of the dual paths as a coordinate axis, and generating a transmission domain boundary through simulation interference. And combining the historical interference data with the node topology weight to generate a periodical interference situation vector. And positioning a main path risk node in real time, matching the interference situation vector of the current period, calculating a target failure boundary point through a transmission domain boundary, and further deriving a transmission safety distance by combining a signal attenuation coefficient, path complexity and environmental factors. When the safety distance is lower than the threshold value, the system screens candidate paths meeting the requirements of hop count, stability and load balance, and automatically switches to the candidate path with the lowest risk by calculating the node cascade failure risk value.

Inventors

  • ZHANG QIAN

Assignees

  • 索尔集团股份有限公司

Dates

Publication Date
20260512
Application Date
20250729

Claims (10)

  1. 1. The armored optical fiber transmission path intelligent switching and attenuation prediction system is characterized by comprising a transmission domain construction module, an interference situation analysis module, a path switching decision module and a database, wherein the modules are in communication connection; The transmission domain construction module selects a main path and a standby path of the current service, establishes a two-dimensional analysis plane by taking the signal-to-noise ratio attenuation rate of the main path as a first coordinate axis and the signal-to-noise ratio attenuation rate of the standby path as a second coordinate axis, synchronously measures the signal-to-noise ratio attenuation rates of the main path and the standby path in a non-interference state, takes the ratio of the signal-to-noise ratio attenuation rates of the main path and the standby path as a reference ratio, and then carries out an analog interference test based on the reference ratio to generate a transmission domain boundary; The interference situation analysis module divides the daily operation period into a preset number of equal-length time periods, determines the node interference trend quantity of each optical fiber node in each equal-length time period based on the historical interference data of each optical fiber node in the optical fiber network, distributes a transmission weight coefficient for each optical fiber node according to the quantity of connection paths and the flow bearing proportion of the optical fiber nodes in the optical fiber network topology, and generates an interference situation vector of each equal-length time period according to the node interference trend quantity of each optical fiber node in each equal-length time period and the transmission weight coefficient of each optical fiber node; The path switching decision module acquires path risk nodes of the main path, matches interference situation vectors corresponding to equal-length periods according to the time stamp of the current moment, takes the interference situation vectors as parameter deterioration directions, positions target failure boundary points through a dichotomy based on a transmission domain boundary, and then calculates interference intensity difference values of the path risk nodes and the target failure boundary points; the path switching decision module acquires a signal attenuation coefficient of the main path, takes the ratio of the interference intensity difference value of the path risk node and the target failure boundary point to the signal attenuation coefficient as an equivalent attenuation distance, and corrects the equivalent attenuation distance according to the path complexity coefficient and the environment compensation coefficient to obtain a transmission safety distance; When the transmission safety distance is smaller than a preset distance threshold, the path switching decision module screens candidate path sets meeting the conditions of hop count, stability and load balance, calculates single-point fault probability of each optical fiber node, identifies cascading source points, calculates fault propagation probability of the cascading source points, generates cascading failure risk values of each candidate path according to the fault propagation probability, and then switches the transmission path of the current service into the candidate path with the lowest cascading failure risk value.
  2. 2. The system of claim 1, wherein the transmission domain construction module performing the simulated interference test based on the reference ratio to generate the transmission domain boundary comprises: The transmission domain construction module gradually increases the interference intensity according to a preset step length, ensures that the increment of the signal-to-noise ratio attenuation rate of the main path and the increment of the signal-to-noise ratio attenuation rate of the standby path are always the reference ratio, and synchronously monitors the optical power, the signal-to-noise ratio and the transmission delay; Stopping the simulation interference test when any transmission domain constraint condition is triggered, and recording the interference intensity and path parameter combination at the moment and marking the combination as a failure boundary point, wherein the transmission domain constraint condition comprises that the optical power exceeds the safety upper limit of equipment, the signal-to-noise ratio is lower than the communication quality threshold value, and the transmission time delay is greater than the maximum allowable time delay of the service; traversing all main and standby path combinations in the optical fiber network, and repeatedly executing failure boundary point detection operation; the transmission domain construction module maps the failure boundary points of all the main and standby path combinations to a two-dimensional analysis plane, connects all the failure boundary points in the two-dimensional analysis plane to form a closed curve, and takes the closed curve as a transmission domain boundary.
  3. 3. The system of claim 1, wherein the interference situation analysis module determining the node interference trend based on historical interference data for each fiber node in the fiber optic network comprises: the interference situation analysis module calculates the interference intensity difference value of each optical fiber node in each equal-length period according to the historical interference data, wherein the interference intensity difference value is the difference between the interference intensity values of the period ending time and the period starting time; The interference situation analysis module calculates arithmetic average value of interference intensity differences of the same node in the same period of the historical date to generate node interference trend quantity of the optical fiber node in the same period, wherein the node interference trend quantity characterizes average change rule of the interference intensity of the same optical fiber node in the same period of the historical date and is used for quantifying periodic evolution characteristics of node level interference.
  4. 4. The system of claim 3, wherein the interference situation analysis module assigns a transmission weight coefficient to each fiber node based on the number of connection paths and the traffic-to-bearer ratio comprises: the interference situation analysis module counts the total number of the effective transmission paths taking each optical fiber node as an endpoint, and takes the ratio of the total number of the effective transmission paths to the total number of the optical fiber nodes as the path connection density of each optical fiber node; The interference situation analysis module records the transmission flow peak value of each optical port of the optical fiber node, takes the ratio of the transmission flow peak value of each optical port to the port design capacity as the port bearing proportion of each optical port, and takes the largest port bearing proportion of all the optical ports as the flow bearing proportion of the optical fiber node; and the interference situation analysis module performs weighted summation on the path connection density and the flow bearing proportion of each optical fiber node to obtain the transmission weight coefficient of each optical fiber node.
  5. 5. The system of claim 4 wherein the interference situation analysis module generates each of the equal-length interference situation vectors based on the node interference trend for each of the equal-length time periods for each of the fiber nodes and the transmission weight coefficient for each of the fiber nodes: the interference situation analysis module performs weighted summation on the node interference trend quantity of all the optical fiber nodes according to the transmission weight coefficient of each optical fiber node to obtain a system interference trend quantity; The interference situation analysis module respectively compares the symbol of the node interference trend quantity of each optical fiber node with the symbol of the system interference trend quantity, and screens out all optical fiber nodes which are the same as the symbol of the system interference trend quantity to form a homodromous trend node set; The interference situation analysis module normalizes the node interference trend quantity of each optical fiber node in the homodromous trend node set; The interference situation analysis module is used for sorting the normalized node interference trend according to the ascending order of the level numbers of the optical fiber nodes in the optical fiber network topology to form an interference situation vector; the above operations are performed for each equal-length period to obtain an interference situation vector for each equal-length period.
  6. 6. The system of claim 5, wherein the path switch decision module obtaining the path risk node for the primary path comprises: the path switching decision module performs normalization processing on an interference intensity value, an optical power fluctuation value, a signal-to-noise ratio degradation value and a time delay jitter value of each optical fiber node acquired in real time at the current moment; The path switching decision module takes the maximum value of the four normalization values as a node risk value of each optical fiber node at the current moment for each optical fiber node; And the path switching decision module selects the optical fiber node with the highest node risk value in the main path as the path risk node.
  7. 7. The system of claim 6, wherein the path switch decision module locating the target failure boundary point by dichotomy comprises: the path switching decision module takes the interference intensity value of the path risk node of the main path as a starting point, and takes the highest interference intensity value recorded by the main path and the standby path in the boundary of the transmission domain as an end point; The path switching decision module takes the intermediate value of the starting point and the end point as a test point, and enhances the interference intensity of each optical fiber node according to the normalized proportion of the homodromous trend node set along the parameter degradation direction; The path switching decision module keeps the increment ratio of the signal-to-noise ratio attenuation rate of the main and standby paths as a reference ratio in the analog interference, and synchronously detects whether the optical power, the signal-to-noise ratio and the transmission delay trigger the constraint condition of the transmission domain; when any transmission domain constraint condition is triggered, marking the test point as a failure point, and updating the test point as an end point; When any transmission domain constraint condition is not triggered, marking the test point as a safety point, and updating the test point as a starting point; Repeating the iteration steps until the difference value between the starting point and the end point is smaller than a preset precision threshold value, and outputting a safety point of the last iteration as a target failure boundary point, wherein the target failure boundary point represents the stable operation limit of the current active-standby path combination.
  8. 8. The system of claim 7, wherein the signal attenuation coefficient is obtained from a database based on the type of fiber materials of the main path, the path complexity coefficient is calculated by weighting according to the hop count, the bending point count and the joint count of the main path, and the environment compensation coefficient is obtained by accessing a meteorological data interface in real time to obtain temperature, humidity and air pressure parameters and querying a preset attenuation mapping table.
  9. 9. The system of claim 8, wherein the path switch decision module screens the candidate path set, and wherein calculating the single point failure probability for each fiber node and identifying the cascading source points comprises: The path switching decision module marks the optical fiber nodes with the interference intensity less than a preset threshold value with the interference intensity of the target failure boundary points as high-risk nodes, and extracts all feasible transmission paths avoiding the high-risk nodes from the current optical fiber network topology; The path switching decision module screens feasible transmission paths meeting that the maximum hop count is smaller than a preset hop count threshold, the historical availability is larger than a preset availability threshold and the flow distribution balance is larger than a preset balance threshold to form a candidate path set; the path switching decision module calculates single-point fault probability of each optical fiber node according to the historical fault frequency of the optical fiber node and the interference intensity value difference value between the current interference intensity value and the target failure boundary point; The path switching decision module marks the optical fiber nodes with single-point fault probability exceeding a preset warning threshold or with physical distance smaller than a safety isolation distance from the failed nodes as cascade source points, and the safety isolation distance is preset according to the type of the optical fibers.
  10. 10. The system of claim 9, wherein the path switch decision module calculates a probability of failure propagation for the cascading source points and generating a cascading failure risk value for each candidate path based on the probability of failure propagation comprises: the path switching decision module builds a weighted undirected graph model of the optical fiber network, and the edge weight is the reciprocal of the physical distance; The path switching decision module calculates the historical propagation frequency f s of the cascade source point s according to the historical fault data, and calculates the topological distance weight average value and the minimum physical distance from the cascade source point s to the candidate path P, wherein the topological distance weight average value is the edge weight average value from all optical fiber nodes on the path P to the cascade source point s; the path switching decision module calculates the fault propagation probability of the cascade source point s to the candidate path P according to the following formula; Wherein P s-P is the probability of fault propagation of the cascade source point s to the candidate path P, f s is the historical propagation frequency of the cascade source point s, G s-P is the topological distance weight average value from the cascade source point s to the candidate path P, d min (s, P) is the minimum physical distance from the cascade source point s to the candidate path P, and alpha is an adjustment coefficient; and the path switching decision module adds the sum of single-point fault probabilities of all the optical fiber nodes on each candidate path and the sum of fault propagation probabilities of all the cascade source points to each candidate path to obtain a cascade failure risk value of each candidate path, and arranges the candidate paths according to the cascade failure risk value in ascending order, and outputs the cascade failure risk value as a switching decision queue.

Description

Intelligent switching and attenuation prediction system for armored optical fiber transmission path Technical Field The invention relates to the field of optical fiber path switching, in particular to an armored optical fiber transmission path intelligent switching and attenuation prediction system. Background With the growing demand for high-reliability optical fiber transmission in the fields of industrial automation and communication, armored optical fiber networks face increasingly complex interference environments. In the prior art, a dual-path hot backup mechanism is mainly adopted, and path switching is triggered by presetting a fixed threshold. However, this approach has significant drawbacks: Firstly, the traditional static threshold cannot adapt to the space-time dynamic characteristics of interference, especially when the interference intensity in a day-night period shows regular fluctuation, error switching or delay switching frequently occurs, secondly, the path decision only considers the current node state, the weight difference and the fault cascading effect of key nodes in the network topology are ignored, and finally, the complexity of the uncoupled real-time environment and the path structure is safely evaluated, and the situation of instantaneous degradation of a new path after switching occurs for many times under severe weather conditions is avoided. The defects expose three technical bottlenecks, namely the lack of quantitative modeling capability on periodic interference situations, incapability of prejudging stable boundaries of a transmission system, disconnection of switching decisions and network global risks, unrecognization of cascade failure source points, and incapacitation of environmental factors and path characteristics into real-time prediction, so that calculation distortion of transmission safety distances is caused. Therefore, an intelligent system capable of integrating space-time interference rules, network topology weights and environment compensation factors is needed, namely, a dynamic transmission domain boundary is needed to be constructed to quantify the anti-interference limit of the system, risk pre-sensing is needed to be realized through a time-lapse interference situation vector, and cascade failure risks and environment influences are needed to be synchronously calculated during path switching. Disclosure of Invention Aiming at the defects of the prior art, the embodiment of the invention provides an armored optical fiber transmission path intelligent switching and attenuation prediction system, which comprises a transmission domain construction module, an interference situation analysis module, a path switching decision module and a database, wherein the modules are in communication connection; The transmission domain construction module selects a main path and a standby path of the current service, establishes a two-dimensional analysis plane by taking the signal-to-noise ratio attenuation rate of the main path as a first coordinate axis and the signal-to-noise ratio attenuation rate of the standby path as a second coordinate axis, synchronously measures the signal-to-noise ratio attenuation rates of the main path and the standby path in a non-interference state, takes the ratio of the signal-to-noise ratio attenuation rates of the main path and the standby path as a reference ratio, and then carries out an analog interference test based on the reference ratio to generate a transmission domain boundary; The interference situation analysis module divides the daily operation period into a preset number of equal-length time periods, determines the node interference trend quantity of each optical fiber node in each equal-length time period based on the historical interference data of each optical fiber node in the optical fiber network, distributes a transmission weight coefficient for each optical fiber node according to the quantity of connection paths and the flow bearing proportion of the optical fiber nodes in the optical fiber network topology, and generates an interference situation vector of each equal-length time period according to the node interference trend quantity of each optical fiber node in each equal-length time period and the transmission weight coefficient of each optical fiber node; The path switching decision module acquires path risk nodes of the main path, matches interference situation vectors corresponding to equal-length periods according to the time stamp of the current moment, takes the interference situation vectors as parameter deterioration directions, positions target failure boundary points through a dichotomy based on a transmission domain boundary, and then calculates interference intensity difference values of the path risk nodes and the target failure boundary points; the path switching decision module acquires a signal attenuation coefficient of the main path, takes the ratio of the interference intensity difference va