Abstract
ABSTRACT A distributed fiber optic vibration sensing system with high frequency response and multi-points accurate location is proposed and demonstrated by combining a feedback loop-based interferometer (FLI) and a phase sensitive optical time domain reflectometer (φ-OTDR). The FLI and the φ-OTDR are merged together based on a wavelength division multiplexing (WDM) scheme. Assisted by the feedback loop, the interferometer structure can achieve a high frequency detection using a single fiber only. Meanwhile, the vibration position is obtained by the φ-OTDR, which shares the same fiber with the FLI. Experimental results demonstrate that the frequency response of the merged system reaches up to 300 kHz, and the spatial resolution is 15 m at the sensing length of 4 km. Compared with previous reported systems, the structure of our proposed system is simpler, only one fiber is used to detect the frequency and the position of the vibration. In addition, the single end sensing has also been achieved in the proposed system.
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