基于改进小波变换的OTDR事件检测方法  

Event detection method of OTDR based on improved wavelet transform

作　　者：臧益鹏 李现勤 吴松桂 葛菲 王炜廷 顾文华 ZANG Yipeng;LI Xianqin;WU Songgui;GE Fei;WANG Weiting;GU Wenhua(Wuxi Taclink Optoelectronics Technology Co.,Ltd.,Wuxi Jiangsu 214000,China)

机构地区：[1]无锡市德科立光电子技术股份有限公司,江苏无锡214000

出　　处：《光通信技术》2024年第1期23-28,共6页Optical Communication Technology

基　　金：江苏省卓越博士后计划资助。

摘　　要：针对信号中噪声影响的问题,提出了基于改进小波变换的光时域反射仪(OTDR)事件检测方法。首先通过对小波去噪算法进行改进,获得新的阈值选取方式和阈值判断函数,然后结合小波模极大值法和斜率法定位测量光纤发生事件位置和光纤始末端位置,计算事件衰减损耗的同时对事件进行分隔和误判消除。仿真和实验结果表明:所提方法的定位精准度较高,反射事件和非反射事件的计算位置偏差分别小于5 m和15 m;测量光纤的事件检测分析结果与光纤连接位置及光纤总长度相符。To solve the problem of noise in signal,an event detection method of optical time domain reflectometer(OTDR)based on improved wavelet transform is proposed.Firstly,by improving the wavelet de-noising algorithm,a new threshold selection method and threshold judgment function are obtained.Then,the event location and the beginning end location of the fiber are measured by combining the wavelet mode maximum method and the slope legal bit,and the event attenuation loss is calculated while the event is separated and the misjudgment is eliminated.The simulation and experimental results show that the proposed method has high positioning accuracy,and the calculated position deviation of reflected event and non-reflected event is less than 5 m and 15 m,respectively.The results of event detection and analysis of the measured fiber are consistent with the connection position and the total length of the fiber.

关 键 词：小波变换 光时域反射仪 小波去噪 事件检测 精准定位 

分 类 号：TN91[电子电信—通信与信息系统]