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Distributed optical fiber vibration waveform sensing system based on compensating interferometer

A distributed optical fiber vibration sensing system based on compensating interferometer is established and a distributed optical fiber vibration waveform detecting technology based on a MZ compensating interferometer and compensating interference of Rayleigh backscattering lights in adjacent areas is put forward. In laboratory experiment, the sensing fiber is a 2500m SM fiber. By exerting 500Hz PZT vibration signals on the fiber at 40m, 430m, and 2500m, the locations of the signals are obtained by phase demodulation. But there is a crosstalk at 40m because of multiple scatterings. The spatial resolution is 40m and the SNR is 18dB.