Quadrature phase-shifted optical demodulator for low-coherence fiber-optic Fabry-Perot interferometric sensors

Qi, Bing; Winder, Drew E.; Liu, Yun

doi:10.1364/OE.27.007319

Title: Quadrature phase-shifted optical demodulator for low-coherence fiber-optic Fabry-Perot interferometric sensors

Journal Article · Wed Feb 27 00:00:00 EST 2019 · Optics Express

DOI:https://doi.org/10.1364/OE.27.007319· OSTI ID:1496912

Qi, Bing; Winder, Drew E.; Liu, Yun

We demonstrate a quadrature phase-shifted optical demodulation scheme for low-coherence fiber-optic Fabry-Perot interferometric sensors. The main part of the demodulator is a fiber-optic Mach-Zehnder interferometer (MZI) constructed with a 1 × 2 fiber coupler, a 3 × 3 fiber coupler, and fiber delay lines. This configuration allows us to generate quadrature phase-shifted interference signals simultaneously, thus eliminating the problem of ambiguous phase discrimination. The path length difference of the MZI is adjustable to adapt to sensors with arbitrary gaps. A great phase stability of the MZI has been obtained by using identical optical components in its two optical paths. The demodulator has been applied to a fiber-optic vibrometer. Measurement of vibrations with amplitudes from 0.67 nm to 12.3 µm has been demonstrated.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1496912

Alternate ID(s):: OSTI ID: 1497726; OSTI ID: 1502560

Journal Information:: Optics Express, Journal Name: Optics Express Vol. 27 Journal Issue: 5; ISSN 1094-4087

Publisher:: Optical Society of America (OSA)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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fiber-optic sensor
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Title: Quadrature phase-shifted optical demodulator for low-coherence fiber-optic Fabry-Perot interferometric sensors

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