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Optical Engineering

Signal-to-noise ratio enhancement of phase-sensitive optical time-domain reflectometry based on power spectrum analysis
Author(s): Qin Li; Chunxi Zhang; Lijing Li; Xiang Zhong
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Paper Abstract

A location technique based on power spectrum analysis for the phase-sensitive optical time-domain reflectometry is proposed. The frequency characteristics of the backscattered signal at a time interval over the sensing fiber are provided to discriminate the disturbance region from other regions. Compared with conventional location techniques, the proposed method significantly enhances the signal-to-noise ratio (SNR). Therefore, it can provide a high-performance and cost-effective solution avoiding the use of the laser with super low-frequency drift. Although the frequency drift of the laser utilized in the experiment is 230  MHz/min , the average SNR is improved to be 20.3 dB and the maximum location error is 100 m over the monitored length of 9 km during 20 experiments.

Paper Details

Date Published: 21 February 2014
PDF: 6 pages
Opt. Eng. 53(2) 026106 doi: 10.1117/1.OE.53.2.026106
Published in: Optical Engineering Volume 53, Issue 2
Show Author Affiliations
Qin Li, BeiHang Univ. (China)
Chunxi Zhang, BeiHang Univ. (China)
Lijing Li, BeiHang Univ. (China)
Xiang Zhong, BeiHang Univ. (China)

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