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Optical Engineering • Open Access

Differential Brillouin fiber sensor based on phase difference on double-sideband pump wave
Author(s): Wenqiao Lin; Xiaobin Hong; Zhisheng Yang; Jian Wu; Jintong Lin

Paper Abstract

A configuration based on phase difference on a double-sideband pump wave is proposed to detect the differential variation of temperature or strain in single-mode optical fibers. In our configuration, a probe wave only experiences a differential Brillouin gain contributed by the perturbation of temperature or strain in the sensing fiber. As a result, the power limitation of the probe wave can be alleviated and the photodetector in our configuration does not easily become saturated in the case of a longer sensing range. The spatial resolution is determined by the duration of the phase difference on the two sidebands and the signal-to-noise of our system is nearly twice as high as that of a differential pulse-width pair Brillouin optical time domain analysis sensor since a π-phase shift on the pump wave is employed. The properties and performances of our method are also theoretically derived and experimentally validated.

Paper Details

Date Published: 3 June 2015
PDF: 7 pages
Opt. Eng. 54(6) 067101 doi: 10.1117/1.OE.54.6.067101
Published in: Optical Engineering Volume 54, Issue 6
Show Author Affiliations
Wenqiao Lin, Beijing Univ. of Posts and Telecommunications (China)
Xiaobin Hong, Beijing Univ. of Posts and Telecommunications (China)
Zhisheng Yang, Beijing Univ. of Posts and Telecommunications (China)
Jian Wu, Beijing Univ. of Posts and Telecommunications (China)
Jintong Lin, Beijing Univ. of Posts and Telecommunications (China)


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