CN-122027014-A - Optical cable fiber core health assessment and early warning method based on B-OTDR technology

CN122027014ACN 122027014 ACN122027014 ACN 122027014ACN-122027014-A

Abstract

The invention discloses an optical cable fiber core health assessment and early warning method based on a B-OTDR technology, and relates to the technical field of optical cable monitoring. According to the method, a physical architecture comprising a B-OTDR monitoring host, an optical cable line and network equipment is constructed, the B-OTDR monitoring host is utilized to send pumping light to an optical cable and receive backward Brillouin scattering light, and based on the linear relation between the Brillouin frequency shift quantity and temperature and stress, the temperature and stress information of the fiber core of the optical cable is respectively demodulated through a temperature and stress decoupling algorithm. And carrying out data processing and analysis on the acquired information, constructing an optical cable fiber core health assessment model, assessing the health state of the optical cable fiber core in real time according to the model, and sending out an early warning signal when the early warning condition is met. The invention can realize high-precision real-time monitoring of the stress and the temperature of the optical cable fiber core, discover tiny damage and early fault hidden danger in time, accurately evaluate the health state and the residual life of the optical cable fiber core through the health evaluation model, and provide scientific basis for maintenance and replacement of the optical cable.

Inventors

LIU HAO
YANG JIAN
WANG HAIPENG
WU BIN
ZHANG YU
LU YUNPENG
SHI RAN
LI GUOXIN

Assignees

内蒙古电力(集团)有限责任公司呼和浩特供电分公司

Dates

Publication Date: 20260512
Application Date: 20251208

Claims (8)

1. The optical cable fiber core health assessment and early warning method based on the B-OTDR technology is characterized by comprising the following steps: s1, constructing a physical architecture, wherein the physical architecture comprises a B-OTDR monitoring host, an optical cable line and network equipment, the B-OTDR monitoring host is deployed in an optical cable monitoring center, the optical cable line comprises an OPGW optical cable to be monitored, sensing optical fibers laid along the optical cable are tightly combined with an optical cable fiber core, and the network equipment is connected with a server of the B-OTDR monitoring host and the monitoring center; S2, a B-OTDR monitoring host is used for sending pumping light to the optical cable, receiving backward Brillouin scattering light, demodulating the Brillouin frequency shift of the optical cable along the path according to the frequency shift of the backward Brillouin scattering light and the pumping light, and respectively demodulating the temperature and stress information of the fiber core of the optical cable through a temperature and stress decoupling algorithm based on the linear relation between the Brillouin frequency shift and the temperature and stress; S3, performing data processing and analysis on the acquired temperature and stress information, constructing an optical cable fiber core health assessment model, assessing the health state of the optical cable fiber core in real time according to the health assessment model, and sending out an early warning signal when the early warning condition is met; s4, constructing a software architecture, wherein the software architecture comprises a background framework developed based on springboot + mybatisPlus and a front end part adopting a Vue framework, and a data interface for transmitting data flow to a system service flow inlet through HTTP requests; s5, an application system is built, and the system comprises a data acquisition module, a data processing module, a health evaluation module, an early warning module and a visual display module, so that the functions of monitoring, evaluating, early warning and displaying the optical cable fiber cores are realized.
2. The method for evaluating and early warning health of an optical cable fiber core based on the B-OTDR technology as set forth in claim 1, wherein a compensation mechanism and multi-parameter fitting are introduced into the temperature and stress decoupling algorithm.
3. The method for evaluating and early warning health of an optical cable fiber core based on the B-OTDR technology according to claim 1, wherein the health evaluation model is based on a deep learning algorithm and automatically learns historical monitoring data and actual running conditions of the optical cable fiber core.
4. The method for evaluating and early warning health of an optical cable fiber core based on the B-OTDR technology as claimed in claim 1, wherein the visual display module displays health status, monitoring data, evaluation results and early warning information of the optical cable fiber core through a GIS map, supports various display modes, and enables users to display content and layout in a self-defined mode according to requirements.
5. The method for evaluating and early warning health of an optical cable fiber core based on the B-OTDR technology as claimed in claim 1, wherein the B-OTDR monitoring host has high-precision signal processing capability and stable data transmission performance, and the network equipment adopts a redundant design and has an automatic switching function, so that continuity and reliability of data transmission are ensured under the condition of equipment failure or network interruption.
6. The method for evaluating and pre-warning health of an optical cable fiber core based on B-OTDR technology as set forth in claim 1, wherein said data acquisition module supports multiple data acquisition modes and is compatible with different types of B-OTDR systems.
7. The method for evaluating and pre-warning health of an optical cable fiber core based on the B-OTDR technology as set forth in claim 1, wherein the pre-warning module has a function of dynamically adjusting the pre-warning threshold, and the pre-warning threshold is automatically optimized according to the health state and the actual running condition of the optical cable fiber core.
8. The method for evaluating and early warning health of an optical cable fiber core based on the B-OTDR technology as claimed in claim 1, wherein the software architecture supports expansion and upgrading of a system for integrating new functional modules and algorithms, the application system has a user authority management function, different levels of users have different operation authorities, security of the system and confidentiality of data are ensured, and unauthorized access and operation are prevented.

Description

Optical cable fiber core health assessment and early warning method based on B-OTDR technology Technical Field The invention relates to the technical field of power communication, in particular to an optical cable fiber core health assessment and early warning method based on a B-OTDR technology. Background The optical cable is used as a key transmission medium of the power communication network and carries core services such as power grid dispatching, marketing, production and the like, and the stability and the reliability of the operation of the optical cable are directly related to the safe and efficient operation of the power system. In an electric power system, an optical fiber composite overhead ground wire (OPGW) optical cable is widely used because it has a dual function of both a power transmission line ground wire and a communication optical cable. However, OPGW optical cables are usually laid overhead and exposed to complex and variable natural environments for a long time, and face the influence of many severe factors such as wind, rain, snow, ice, thunder, mountain fire, etc., and meanwhile, the OPGW optical cables also need to bear the risks of mechanical stress generated by self gravity, temperature rapid change caused by short-circuit current impact, etc., so that the performance of optical cable fiber cores is easily degraded, even faults are broken, and the normal operation of an electric power communication network is threatened. Currently, the monitoring of optical cables is mainly performed by conventional methods. Conventional optical cable online monitoring devices are mostly based on the normal OTDR (optical time domain reflectometer) of rayleigh scattering, which locates the breaking point or attenuation point of an optical fiber by detecting the backscattered light in the optical cable. Yet another way is to shorten the fault location error by stringing a coded grating in the cable joint box using fiber grating coding techniques. While these prior art techniques have enabled, to some extent, the localization of cable faults and partial performance monitoring, there are a number of drawbacks. The conventional OTDR technology has poor timeliness, and can detect abnormality only when the optical cable line is obviously attenuated, namely the optical cable is seriously damaged, so that early fault signs of the optical cable are difficult to capture in time, and the support for preventive maintenance is insufficient. Although the fiber bragg grating coding mode has higher positioning precision, when the existing optical cable is reformed, the existing optical cable connector box needs to be opened, so that the great engineering risk exists, the fiber cores of the optical cable parts are easily broken, the problem of loose sealing of the connector box can occur, and new fault hidden danger is caused. In addition, the conventional fault location of the optical cable can be solved by the existing monitoring means, the early fault characteristics such as tiny damage, optical fiber attenuation change and the like of the optical cable are difficult to detect timely and accurately, the health state and the residual life of the optical cable cannot be effectively evaluated, and the intelligent operation and maintenance requirements of the electric power communication optical cable are difficult to meet. The root cause of the method is that the prior monitoring technology lacks the capability of real-time, high-precision monitoring and comprehensive analysis of key parameters such as stress, temperature and the like of the fiber core of the optical cable, and cannot comprehensively and deeply master the actual running condition and performance change trend of the optical cable, thereby providing scientific and effective basis for the maintenance of the optical cable. Disclosure of Invention Aiming at the defects in the prior art, the invention provides an optical cable fiber core health assessment and early warning method based on a B-OTDR technology, which comprises the following steps: s1, constructing a physical architecture, wherein the physical architecture comprises a B-OTDR monitoring host, an optical cable line and network equipment, the B-OTDR monitoring host is deployed in an optical cable monitoring center, the optical cable line comprises an OPGW optical cable to be monitored, sensing optical fibers laid along the optical cable are tightly combined with an optical cable fiber core, and the network equipment is connected with a server of the B-OTDR monitoring host and the monitoring center; S2, a B-OTDR monitoring host is used for sending pumping light to the optical cable, receiving backward Brillouin scattering light, demodulating the Brillouin frequency shift of the optical cable along the path according to the frequency shift of the backward Brillouin scattering light and the pumping light, and respectively demodulating the temperature and stress information of the fiber core of