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A distributed optical fiber sensing system for synchronous vibration and loss measurement

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Abstract

We propose a fully distributed fusion system combining phase-sensitive optical time-domain reflectometry (Φ-OTDR) and OTDR for synchronous vibration and loss measurement by setting an ingenious frequency sweep rate (FSR) of the optical source. The relationships between FSR, probe pulse width and repeat period are given to balance the amplitude fluctuation of OTDR traces, the dead zone probability and the measurable frequency range of vibration events. In the experiment, we achieve synchronous vibration and loss measurement with FSR of 40 MHz/s, the proble pulse width of 100 ns and repeat rate of 0.4 ms. The fluctuation of OTDR trace is less than 0.45 dB when the signalto- noise ratio (SNR) is over 12 dB for a captured vibration event located at 9.1 km. The proposed method can be used for not only detection but also early warning of damage events in optical communication networks.

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DOI:10.1007/s11801-016-6133-z

基金项目:This work has been supported by the National Natural Science Foundation of China (Nos.61405090, 61307096 and 61540017).

收稿日期:2016-06-12

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ZHANG Xu-ping:Institute of Optical Communication Engineering, Nanjing University, Nanjing 210008, ChinaThe Key Laboratory of Modern Acoustics, Ministry of Education of China, Institute of Acoustics, Nanjing University, Nanjing 210008, China
QIAO Wei-yan:Institute of Optical Communication Engineering, Nanjing University, Nanjing 210008, China
SUN Zhen-hong:Institute of Optical Communication Engineering, Nanjing University, Nanjing 210008, China
SHAN Yuan-yuan:Institute of Optical Communication Engineering, Nanjing University, Nanjing 210008, China
ZENG Jie:State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
ZHANG Yi-xin:Institute of Optical Communication Engineering, Nanjing University, Nanjing 210008, ChinaThe Key Laboratory of Modern Acoustics, Ministry of Education of China, Institute of Acoustics, Nanjing University, Nanjing 210008, China

联系人作者:ZHANG Yi-xin(zyixin@nju.edu.cn)

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引用该论文

ZHANG Xu-ping,QIAO Wei-yan,SUN Zhen-hong,SHAN Yuan-yuan,ZENG Jie,ZHANG Yi-xin. A distributed optical fiber sensing system for synchronous vibration and loss measurement[J]. 光电子快报(英文版), 2016, 12(5): 375-378

ZHANG Xu-ping,QIAO Wei-yan,SUN Zhen-hong,SHAN Yuan-yuan,ZENG Jie,ZHANG Yi-xin. A distributed optical fiber sensing system for synchronous vibration and loss measurement[J]. Optoelectronics Letters, 2016, 12(5): 375-378

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