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Sensors 2014, 14(6), 10977-11000; doi:10.3390/s140610977

Frequency-Shifted Interferometry — A Versatile Fiber-Optic Sensing Technique

1
The Edward S. Rogers Sr. Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada
2
Quantum Information Science Group, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37830, USA
*
Author to whom correspondence should be addressed.
Received: 15 April 2014 / Revised: 24 May 2014 / Accepted: 16 June 2014 / Published: 20 June 2014
(This article belongs to the Special Issue State-of-the-Art Sensors in Canada 2014)
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Abstract

Fiber-optic sensing is a field that is developing at a fast pace. Novel fiber-optic sensor designs and sensing principles constantly open doors for new opportunities. In this paper, we review a fiber-optic sensing technique developed in our research group called frequency-shifted interferometry (FSI). This technique uses a continuous-wave light source, an optical frequency shifter, and a slow detector. We discuss the operation principles of several FSI implementations and show their applications in fiber length and dispersion measurement, locating weak reflections along a fiber link, fiber-optic sensor multiplexing, and high-sensitivity cavity ring-down measurement. Detailed analysis of FSI system parameters is also presented. View Full-Text
Keywords: fiber optics; interferometry; Sagnac interferometer; fiber-optic sensors; sensor multiplexing; cavity ring-down; polarization; Jones calculus fiber optics; interferometry; Sagnac interferometer; fiber-optic sensors; sensor multiplexing; cavity ring-down; polarization; Jones calculus
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Ye, F.; Zhang, Y.; Qi, B.; Qian, L. Frequency-Shifted Interferometry — A Versatile Fiber-Optic Sensing Technique. Sensors 2014, 14, 10977-11000.

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