30 November 2012 Ultra long distance distributed fiber-optic system for intrusion detection
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This paper research an ultra long distance distributed fiber-optic intrusion detects system. Laser source is amplified and modulated before input to the dual Mach-Zehnder interferometers. This ensures the system can detect longer distance with less loss and nonlinearity than continuous laser input. The cross correlation algorithm is considered to locate the vibration event after the polarization controlled of the optical source, and the locate precision is also discussed. Finally, an experiment result is given as the sensing fiber length is 112km with the location precision about 160m.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dongsheng Tu, Dongsheng Tu, Shangran Xie, Shangran Xie, Zhaogong Jiang, Zhaogong Jiang, Min Zhang, Min Zhang, "Ultra long distance distributed fiber-optic system for intrusion detection", Proc. SPIE 8561, Advanced Sensor Systems and Applications V, 85611W (30 November 2012); doi: 10.1117/12.2001292; https://doi.org/10.1117/12.2001292

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