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3 June 2015 Differential Brillouin fiber sensor based on phase difference on double-sideband pump wave
Wenqiao Lin, Xiaobin Hong, Zhisheng Yang, Jian Wu, Jintong Lin
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Optical Engineering, Vol. 54, Issue 6, 067101 (June 2015). https://doi.org/10.1117/1.OE.54.6.067101
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.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Wenqiao Lin, Xiaobin Hong, Zhisheng Yang, Jian Wu, and Jintong Lin "Differential Brillouin fiber sensor based on phase difference on double-sideband pump wave," Optical Engineering 54(6), 067101 (3 June 2015). https://doi.org/10.1117/1.OE.54.6.067101
Published: 3 June 2015
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KEYWORDS
Double sideband modulation
Fiber optics sensors
Spatial resolution
Acoustics
Photodetectors
Signal to noise ratio
Optical engineering
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