Faraday Michelson Interferometers for Signal Demodulation of Fiber-Optic Sensors

Yun Liu; Bing Qi; Drew E. Winder

doi:10.1109/JLT.2021.3053370

Faraday Michelson Interferometers for Signal Demodulation of Fiber-Optic Sensors

Yun Liu, Bing Qi, Drew E. Winder

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

We developed an all-fiber-based optical demodulator for the signal interrogation of low-coherence fiber-optic Fabry-Perot interferometric sensors. The optical demodulator consists of a Michelson interferometer implemented by using a 3 × 3 fiber coupler and two fiber-coupled Faraday reflectors with tunable fiber delay lines. The demodulator's output contains two optical interference signals with a constant phase shift and the output shows no sensitivity to the polarization variation in the light source or fibers. A digital phase recovery algorithm is used to extract the measurand information from the phase-shifted signals at high accuracy, high dynamic range, and high stability. The optical demodulator has been applied to the measurement of high-frequency vibrations and strains using fiber-optic sensors.

Original language	English
Article number	9330759
Pages (from-to)	2552-2558
Number of pages	7
Journal	Journal of Lightwave Technology
Volume	39
Issue number	8
DOIs	https://doi.org/10.1109/JLT.2021.3053370
State	Published - Apr 15 2021

Funding

Manuscript received November 25, 2020; revised January 13, 2021; accepted January 16, 2021. Date of publication January 21, 2021; date of current version April 16, 2021. This research used resources at Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. This manuscript has been authored by UT-Battelle, LLC, under Grant DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). (Corresponding author: Yun Liu.) Yun Liu is with Oak Ridge National Laboratory, Oak Ridge, TN 37831 USA (e-mail: [email protected]).

Funders	Funder number
U.S. Department of Energy

Keywords

Digital signal processing
interferometry
optical fiber sensors
optical phase shifters

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10.1109/JLT.2021.3053370

Cite this

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title = "Faraday Michelson Interferometers for Signal Demodulation of Fiber-Optic Sensors",

abstract = "We developed an all-fiber-based optical demodulator for the signal interrogation of low-coherence fiber-optic Fabry-Perot interferometric sensors. The optical demodulator consists of a Michelson interferometer implemented by using a 3 × 3 fiber coupler and two fiber-coupled Faraday reflectors with tunable fiber delay lines. The demodulator's output contains two optical interference signals with a constant phase shift and the output shows no sensitivity to the polarization variation in the light source or fibers. A digital phase recovery algorithm is used to extract the measurand information from the phase-shifted signals at high accuracy, high dynamic range, and high stability. The optical demodulator has been applied to the measurement of high-frequency vibrations and strains using fiber-optic sensors.",

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N2 - We developed an all-fiber-based optical demodulator for the signal interrogation of low-coherence fiber-optic Fabry-Perot interferometric sensors. The optical demodulator consists of a Michelson interferometer implemented by using a 3 × 3 fiber coupler and two fiber-coupled Faraday reflectors with tunable fiber delay lines. The demodulator's output contains two optical interference signals with a constant phase shift and the output shows no sensitivity to the polarization variation in the light source or fibers. A digital phase recovery algorithm is used to extract the measurand information from the phase-shifted signals at high accuracy, high dynamic range, and high stability. The optical demodulator has been applied to the measurement of high-frequency vibrations and strains using fiber-optic sensors.

AB - We developed an all-fiber-based optical demodulator for the signal interrogation of low-coherence fiber-optic Fabry-Perot interferometric sensors. The optical demodulator consists of a Michelson interferometer implemented by using a 3 × 3 fiber coupler and two fiber-coupled Faraday reflectors with tunable fiber delay lines. The demodulator's output contains two optical interference signals with a constant phase shift and the output shows no sensitivity to the polarization variation in the light source or fibers. A digital phase recovery algorithm is used to extract the measurand information from the phase-shifted signals at high accuracy, high dynamic range, and high stability. The optical demodulator has been applied to the measurement of high-frequency vibrations and strains using fiber-optic sensors.

KW - Digital signal processing

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KW - optical phase shifters

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Faraday Michelson Interferometers for Signal Demodulation of Fiber-Optic Sensors

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