Phase-Sensitive Optical Time-Domain Reflectometer Based on a 120°-Phase-Difference Michelson Interferometer

被引：3
|
作者：
Cao, Yu-Long [1 ,2 ]
Yang, Fei [1 ]
Xu, Dan [1 ,2 ]
Ye, Qing [1 ]
Cai, Hai-Wen [1 ]
Fang, Zu-Jie [1 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Shanghai Key Lab All Solid State Laser & Appl Tec, Shanghai 201800, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
CHINESE PHYSICS LETTERS | 2016年 / 33卷 / 05期
基金：
中国国家自然科学基金;
关键词：
FIBER; OTDR;
D O I：
10.1088/0256-307X/33/5/050701
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A phase-sensitive optical time domain reflectometer (phi-OTDR) based on a 120 degrees-phase-difference Michelson interferometer is proposed. The Michelson interferometer with arm difference of 4m is used to test the phase difference between the Rayleigh scattering from two sections of the fiber. A new demodulation method called the inverse transmission matrix demodulation scheme is utilized to demodulate the distributed phase from the backward scattering along the long fiber. The experimental results show that the 120 degrees-phase-difference interferometer phi-OTDR can detect the phase along the 3km fiber, and the acoustic signal within the whole human hearing range of 20 Hz-20 kHz is reproduced accurately and quickly.
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页数：4
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