Phase demodulation technology using a multi-frequency source for discrimination of interference-fading induced false alarms in a φ -OTDR system

被引：0
作者：
机构：
[1] Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences
[2] Shanghai Bandweaver Communication Technologies Co., Ltd
[3] University of Chinese Academy of Sciences
来源：
Cai, H. (hwcai@siom.ac.cn) | 1600年 / Science Press卷 / 40期
关键词：
Coherent detection; Fading noise; Phase-sensitive optical time domain reflectometer;
D O I：
10.3788/CJL201340.0905003
中图分类号：
学科分类号：
摘要：
The characteristics of interference fading in the phase-demodulated phase-sensitive optical time domain reflectometer (φ-OTDR) system are investigated. It is found that the fading waveforms have high similarity for different pulse scans, but obvious differences for different optical frequencies. An improved model for randomness and coherent noise of Rayleigh scattering is presented. It can be concluded that the composite Rayleigh scattering coefficient is a function of laser frequency and the index distribution, which could explain the experimental results reasonably. In order to eliminate the false alarms due to interference fading, a multi-frequency method is proposed, which can improve the accuracy of the phase demodulation in the φ-OTDR system.
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