基于线性相关系数的COTDR事件判定方法

Method to recognize the COTDR events based on linear correlation coefficients

相干光时域反射仪(COTDR)对长距离多跨段海底光缆线路的测量曲线中包含着剧烈的振幅变化,直接使用常见的小波分析方法对反射事件进行自动判定存在实现难度较大、运算时间较长的不足。提出了一种基于线性相关系数的COTDR事件判定方法,通过对光缆线路实测曲线中局部数据的线性相关系数进行计算和分析,自动区分了光放大器和反射事件产生的功率突变,并得到其准确位置。

The coherent optical time domain refiectometry（COTDR） test results for multi-segment submarine optical cable with long distance often show dramatic amplitude changes. Traditional wavelet analyze method is difficult to deal with COTDR test result owing to the complex and long time consume. This paper proposes a method based on linear correlation coefficients to detect the COTDR events. For an actual measurement curve of optical cable, all the events and optical amplifiers are recognized automatically and positioning accu- rately by calculating and analyzing the linear correlation coefficients of local segments.