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

Sensors

Fei Ye¹  Yiwei Zhang¹  Bing Qi² 

[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; E-Mails:;Quantum Information Science Group, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37830, USA; E-Mail:

关键词: fiber optics;    interferometry;    Sagnac interferometer;    fiber-optic sensors;    sensor multiplexing;    cavity ring-down;    polarization;    Jones calculus;   

DOI  :  10.3390/s140610977

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.