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

Yu Liu; Feng Wang; Xuping Zhang; Yixin Zhang; Weihong Xu; Lin Zhang

doi:10.1117/12.2519615

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

Yu Liu
, Feng Wang
, Xuping Zhang
, Yixin Zhang
, Weihong Xu
, Lin Zhang

Aston Institute of Photonic Technologies (AiPT)

University of Electronic Science and Technology of China
South East University in Nanjing

Research output: Contribution to journal › Conference article › peer-review

5 Citations (Scopus)

116 Downloads (Pure)

Abstract

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.

Original language	English
Article number	110483U
Journal	Proceedings of SPIE - International Society for Optical Engineering
Volume	11048
DOIs	https://doi.org/10.1117/12.2519615
Publication status	Published - 14 Feb 2019
Event	17th International Conference on Optical Communications and Networks, ICOCN 2018 - Zhuhai, China Duration: 16 Nov 2018 → 19 Nov 2018

Bibliographical note

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.

Funding

This work is supported by the National Natural Science Foundation of China under Grant No. 61627816, by the Key Research and Development Program of Jiangsu Province under Grant No. BE2018047 and by the Fundamental Research Funds for the Central Universities under Grant No. 021314380116.

Keywords

Optical fiber sensors
phase demodulation
polarization fading
ultra-weak FBG array

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10.1117/12.2519615

High performance interrogation by a composite-double-probe-pulse for ultra-weak FBG array
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.
Final published version, 415 KB

Cite this

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abstract = "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.",

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AU - Zhang, Yixin

AU - Xu, Weihong

AU - Zhang, Lin

N1 - 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.

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N2 - 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.

AB - 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.

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KW - phase demodulation

KW - polarization fading

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

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