一种远距离高分辨率检测光纤链路的方案

A Scheme for Long-distance High-resolution Detection of Fiber Link

针对检测远距离光纤链路时光时域反射仪(OTDR)空间分辨率过低的问题,文章提出一种线性调频(LFM)-Golay OTDR方案。该方案通过生成周期LFM信号调制光信号,生成Golay序列信号调制周期LFM光信号来提高OTDR的动态范围和空间分辨率。实验结果表明,在长度为200 km的待测光纤链路中,LFM-Golay OTDR的空间分辨率可达到0.22 m,参数设置相同的情况下,比单脉冲OTDR动态范围提高了约15 dB,与Golay码OTDR和LFM OTDR相比动态范围提高了约6 dB。

Aiming at the problem of low spatial resolution of Optical Time Domain Reflectometer(OTDR) in long distance optical fiber link detection, this paper proposes a new scheme of Linear Frequency Modulation(LFM)-Golay OTDR. The scheme improves the dynamic range and spatial resolution of the OTDR by generating LFM signals to modulate optical signals and generating Golay sequence signals to modulate LFM optical signals. The experimental results show that the spatial resolution of the LFM-Golay OTDR can reach resolution of 0.22 m in the optical fiber link under test with a length of 200 km. Under the conditions of same setting parameters, the dynamic range is increased by about 15 dB compared with single pulse OTDR, and the dynamic range of LFM-Golay OTDR is about 6 dB higher than Golay OTDR and LFM OTDR.