23 April 2010 Positioning method for dual Mach-Zehnder interferometric submarine cable security system
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Dual Mach-Zehnder interferometric fiber sensor is one of the appropriate solutions to the application of submarine cable security. While the seabed environment makes the vibration output a narrow bandwidth lowpass interference signal and these property makes the correlation based event positioning algorithm hard to design. A preprocessing method intends to increase signal power spectral range before correlation is proposed. A bandpass filter is imposed to enhance the effect of high frequency components, despite the filtered signal is different from the original one. A post-integration SNR threshold is calculated to determine the proper center frequency and bandwidth of the filter. Experiment results show a good accordance with theoretical prediction.
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Shangran Xie, Shangran Xie, Min Zhang, Min Zhang, Shurong Lai, Shurong Lai, Yanbiao Liao, Yanbiao Liao, } "Positioning method for dual Mach-Zehnder interferometric submarine cable security system", Proc. SPIE 7677, Fiber Optic Sensors and Applications VII, 76770A (23 April 2010); doi: 10.1117/12.850115; https://doi.org/10.1117/12.850115

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