High performance interrogation by a composite-double-probe-pulse for ultra-weak FBG array


We propose and experimentally demonstrate a technique using a composite-double-probe-pulse (CDPP) to eliminate the effect of polarization fading for phase-sensitive optical time-domain reflectometry (Φ-OTDR) based on ultra-weak FBG (UWFBG) array. The CDPP is composed of two optical pulses whose spatial interval is equal to twice the spatial interval of adjacent UWFBGs in the UWFBG array. One optical pulse is a long optical pulse, and the other optical pulse is composed of two continuous short optical pulses, whose polarization states are orthogonal to each other. The width of the short pulse is equal to half of the width of the normal pulse and their frequencies are different from the long pulse. By using such a method to perform the sensing for the UWFBG array, distributed quantitative measurement can be realized with only direct detection scheme and the influence of polarization fading in the demodulation of signal is thoroughly eliminated.

Publication DOI: https://doi.org/10.1117/12.2519615
Divisions: Engineering & Applied Sciences > Electrical, Electronic & Power Engineering
Engineering & Applied Sciences > Aston Institute of Photonics Technology
Additional Information: Copyright 2019 SPIE. One print or electronic copy may be made for personal use only. Systematic reproduction, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Uncontrolled Keywords: Optical fiber sensors,phase demodulation,polarization fading,ultra-weak FBG array,Electronic, Optical and Magnetic Materials,Condensed Matter Physics,Computer Science Applications,Applied Mathematics,Electrical and Electronic Engineering
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
https://www.spi ... 9615.full?SSO=1 (Publisher URL)
PURE Output Type: Conference article
Published Date: 2019-02-14
Accepted Date: 2018-11-01
Authors: Liu, Yu
Wang, Feng
Zhang, Xuping
Zhang, Yixin
Xu, Weihong
Zhang, Lin ( 0000-0002-1691-5577)



Version: Published Version

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