DocumentCode :
62104
Title :
Characteristics and Explanations of Interference Fading of a 
-OTDR With a Multi-Frequency Source
Author :
Jun Zhou ; Zhengqing Pan ; Qing Ye ; Haiwen Cai ; Ronghui Qu ; Zujie Fang
Author_Institution :
Shanghai Key Lab. of All Solid-state Laser & Appl. Tech., Shanghai Inst. of Opt. & Fine Mech., Shanghai, China
Volume :
31
Issue :
17
fYear :
2013
fDate :
Sept.1, 2013
Firstpage :
2947
Lastpage :
2954
Abstract :
The characteristics of interference fading in a phase sensitive optical time domain reflectometer (φ-OTDR) system with a three optical frequency source are described in this paper. It is observed in the experiments that the fading appearance is quite stable over 400 different pulse scans for each of frequencies, but different for the three frequencies. A model is proposed to explain the experimental phenomena, in which the fading waveform is expressed by an integral of propagation phase factor, taking non-uniform index distributions along the sensing fiber into account, multiplied by the random Rayleigh scattering coefficient summed within the detector response period. Simulations show that the basic characteristics of experimental observations can be explained by the model.
Keywords :
Rayleigh scattering; fibre optic sensors; optical fibre dispersion; optical time-domain reflectometry; OTDR; detector response; fading appearance; fading waveform; interference fading; multifrequency source; nonuniform index distribution; phase sensitive optical time domain reflectometer; random Rayleigh scattering coefficient; sensing fiber; Fading; Indexes; Optical fiber sensors; Optical fibers; Optical pulses; Scattering; Coherent optical effects; Rayleigh scattering; fiber sensors; optical time domain reflectometer;
fLanguage :
English
Journal_Title :
Lightwave Technology, Journal of
Publisher :
ieee
ISSN :
0733-8724
Type :
jour
DOI :
10.1109/JLT.2013.2275179
Filename :
6571222
Link To Document :
