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

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

1
, 1
, 2
 and 1,*
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.
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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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