Detecting cm-scale hot spot over 24-km-long single-mode fiber by using differential pulse pair BOTDA based on double-peak spectrum

Sanogo Diakaridia, Yue Pan, Pengbai Xu, Dengwang Zhou, Benzhang Wang, Lei Teng, Zhiwei Lu, Dexin Ba, Yongkang Dong

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

In distributed Brillouin optical fiber sensor when the length of the perturbation to be detected is much smaller than the spatial resolution that is defined by the pulse width, the measured Brillouin gain spectrum (BGS) experiences two or multiple peaks. In this work, we propose and demonstrate a technique using differential pulse pair Brillouin optical time-domain analysis (DPP-BOTDA) based on double-peak BGS to enhance small-scale events detection capability, where two types of single mode fiber (main fiber and secondary fiber) with 116 MHz Brillouin frequency shift (BFS) difference have been used. We have realized detection of a 5-cm hot spot at the far end of 24-km single mode fiber by employing a 50-cm spatial resolution DPP-BOTDA with only 1GS/s sampling rate (corresponding to 10 cm/point). The BFS at the far end of 24-km sensing fiber has been measured with 0.54 MHz standard deviation which corresponds to a 0.5°C temperature accuracy. This technique is simple and cost effective because it is implemented using the similar experimental setup of the standard BOTDA, however, it should be noted that the consecutive small-scale events have to be separated by a minimum length corresponding to the spatial resolution defined by the pulse width difference.

Original languageEnglish
Pages (from-to)17727-17736
Number of pages10
JournalOptics Express
Volume25
Issue number15
DOIs
StatePublished - 24 Jul 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
©2017 Optical Society of America.

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