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

A phase-sensitive optical time domain reflectometer （φ-OTDR） based on a 120°-phase-difference Michelson in- terferometer 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 demo...

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Bibliographic Details
Published inChinese physics letters Vol. 33; no. 5; pp. 22 - 25
Main Author 曹玉龙 杨飞 徐丹 叶青 蔡海文 方祖捷
Format Journal Article
LanguageEnglish
Published 01.05.2016
Subjects
OTDR
光时域反射仪
后向散射
瑞利散射
相位差
相敏
解调方法
迈克尔逊干涉仪
Online AccessGet full text
ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/33/5/050701

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Summary:A phase-sensitive optical time domain reflectometer （φ-OTDR） based on a 120°-phase-difference Michelson in- terferometer 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°-phase-difference inter- ferometer φ-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.
Bibliography:11-1959/O4
A phase-sensitive optical time domain reflectometer （φ-OTDR） based on a 120°-phase-difference Michelson in- terferometer 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°-phase-difference inter- ferometer φ-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.
Yu-Long Cao, Fei Yang, Dan Xu, Qing Ye, Hai-Wen Cai, Zu-aie Fang（1. Shanghai Key Laboratory of All Solid-state Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800; 2. University of Chinese Academy of Sciences, Beijing 100049）
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/33/5/050701