Fault detection of few-mode fiber based on high-order mode with high fault detection sensitivity.
Fault detection of few-mode fiber based on high-order mode with high fault detection sensitivity.
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DOI：
10.1364/ol.44.004487
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发表时间：
2019-09
期刊：
影响因子：
3.6
通讯作者：
Congcong Song;X. Liu;Feng Liu;Meiling Zhang;Guijun Hu
中科院分区：
文献类型：
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作者：
Congcong Song;X. Liu;Feng Liu;Meiling Zhang;Guijun Hu
本文研究了少模光纤中各模的熔接损耗特性。分别测量了六模阶跃光纤和六模渐变光纤的各模熔接故障损耗特性。提出了具有高故障检测灵敏度的高阶模态。不同损失幅值的故障事件可以用高阶模态准确地表征。在此基础上，提出了一种基于高阶模后向散射光的FMF故障检测与定位方法，并进行了实验验证。利用高阶模的瑞利后向散射光对7.2km六模阶跃光纤的三个熔接点进行了不同熔接质量的故障检测，并对各模式的检测结果进行了比较。示出了具有高故障检测灵敏度的高阶模式LP 21 a、LP 21 b和LP 02，成功地检测了位于FMF的1.03、3.1和3.2 km附近的三个故障点。而LP 01、LP 11 a和LP 11 b模式只能检测到一个故障点，该故障点位于FMF的3.19 km附近。
We report on the fusion splice loss characteristics of each mode in few-mode fiber (FMF). The fusion fault loss characteristics of all modes of the six-mode step-index and graded-index fibers are measured, respectively. The high-order modes with high fault detection sensitivity are presented. The fault events with different loss amplitudes can be accurately characterized by high-order modes. On this basis, a fault detection and location method for FMF based on backscattered light of high-order modes is proposed and experimentally demonstrated. Rayleigh backscattering light of high-order modes is utilized to detect the faults of 7.2 km six-mode step-index fiber with three fusion splice points with different fusion quality, the detection results of each mode are compared. The high-order modes LP21a, LP21b, and LP02 with high fault detection sensitivity are shown, three fault points located around 1.03, 3.1, and 3.2 km of the FMF are successfully detected. While the LP01, LP11a, and LP11b modes can detect only one fault point, which is located around 3.19 km of the FMF.