Distributed vibration sensing measurement with high frequency response is still a challenging task in distributed optical fiber vibration sensing systems. In this paper, a WDM based integrated scheme is proposed to directly demodulate the high frequency vibration signal with high spatial resolution by merging the phase sensitive optical time-domain reflectometry and the Sagnac interferometer. A maximum frequency response of ~2.5 MHz and a spatial resolution of 20 m have been achieved in a 4 km sensing fiber link. Comparison to conventional sensing structure, the proposed scheme shows great application potential in the field of distributed vibration sensing system.

中文翻译：

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使用基于WDM的集成方案进行具有高频响应的分布式振动传感

在分布式光纤振动传感系统中，具有高频响应的分布式振动传感测量仍然是一项艰巨的任务。本文提出了一种基于WDM的集成方案，通过将相敏光时域反射仪和Sagnac干涉仪相结合，直接对具有高空间分辨率的高频振动信号进行解调。在4 km传感光纤链路中，已达到约2.5 MHz的最大频率响应和20 m的空间分辨率。与常规传感结构相比，该方案在分布式振动传感系统领域具有广阔的应用潜力。