A novel positioning method for dual Mach-Zehnder interferometric vibration sensor in submarine cable security application

Shangran Xie; Min Zhang; Yanhe Li; Yanbiao Liao

doi:10.1117/12.885172

17 May 2011 A novel positioning method for dual Mach-Zehnder interferometric vibration sensor in submarine cable security application

Shangran Xie, Min Zhang, Yanhe Li, Yanbiao Liao

Author Affiliations +

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77530L (2011) https://doi.org/10.1117/12.885172
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

Abstract

Dual Mach-Zehnder interferometric vibration sensor is an appropriate solution for submarine cable security application. While in this application the detected vibration signal is always narrow-bandwidth and short-duration subject to environmental constraints, which makes correlation based vibration positioning algorithm a poor robustness to noise. A preprocessing method focusing on expanding signal 3dB bandwidth before correlation is proposed in purpose of reducing ultimate positioning mean square error. A high pass filter is imposed to enhance the weight of high frequency components by attenuating low frequency main lobe. Field test results indicate a significant positioning error reduction when using this novel method as long as the cutoff frequency of high pass filter is selected in a valid region where positive effect of bandwidth extension is larger than effect of SNR reduction, and MSE reduction value in valid region agrees well with theoretical prediction.

Citation Download Citation

Shangran Xie, Min Zhang, Yanhe Li, and Yanbiao Liao "A novel positioning method for dual Mach-Zehnder interferometric vibration sensor in submarine cable security application", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77530L (17 May 2011); https://doi.org/10.1117/12.885172

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