利用空分复用探针抑制Phi-OTDR中的干扰衰落
Interference fading suppression in Phi-OTDR using space-division multiplexed probes
摘要：
我们提出并实验证明了一种新的相位敏感光时域反射计（Phi-OTDR）的干涉衰落抑制方法，使用空分复用（SDM）脉冲探头在少模光纤。SDM探头由多个不同的模式组成，在这项工作中使用了三种空间模式（LP 01、LP 11 a和LP 11 b）来证明概念。首先，对不同模式的瑞利后向散射光进行了实验表征，发现不同模式的Phi-OTDR迹线波形都不同。由于不同模式的衰落位置的空间差异，可以使用来自空间复用模式的多个探针来抑制Phi-OTDR中的干扰衰落。然后，Phi-OTDR系统使用单探针和多探针的性能进行了评估和比较。具体地，统计分析表明，通过使用多个SDM探测器，在光纤长度和时间上的衰落概率都显著降低，这验证了衰落抑制的显著性能改善。该方法不需要复杂的频率和相位调制，具有简单、有效和可靠的优点。
英文摘要：
We propose and experimentally demonstrate a novel interference fading suppression method for phase-sensitive optical time domain reflectometry (Phi-OTDR) using space-division multiplexed (SDM) pulse probes in few-mode fiber. The SDM probes consist of multiple different modes, and three spatial modes (LP01, LP11a and LP11b) are used in this work for proof of concept. Firstly, the Rayleigh backscattering light of different modes is experimentally characterized, and it turns out that the waveforms of Phi-OTDR traces of distinct modes are all different from each other. Thanks to the spatial difference of fading positions of distinct modes, multiple probes from spatially multiplexed modes can be used to suppress the interference fading in Phi-OTDR. Then, the performances of the Phi-OTDR systems using single probe and multiple probes are evaluated and compared. Specifically, statistical analysis shows that both fading probabilities over fiber length and time are reduced significantly by using multiple SDM probes, which verifies the significant performance improvement on fading suppression. The proposed novel interference fading suppression method does not require complicated frequency or phase modulation, which has the advantages of simplicity, good effectiveness and high reliability.
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