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Title: FMCW multiplexing of fiber Bragg grating sensors
Authors: Chan, PKC
Jin, W 
Demokan, S
Keywords: Fiber Bragg grating sensors
Frequency-modulated continuous wave
Optical fiber sensors
Strain measurements
Issue Date: Sep-2000
Publisher: IEEE
Source: IEEE journal of selected topics in quantum electronics, Sept./Oct. 2000, v. 6, no. 5, p. 756-763 How to cite?
Journal: IEEE journal of selected topics in quantum electronics 
Abstract: We report on the use of frequency-modulated continuous wave (FMCW) techniques for multiplexing fiber Bragg grating (FBG) sensors. This technique is based on the modulation of light intensity from a broadband source by a linear swept-frequency RF carrier. Signals from the FBG sensors located at different positions in an array are separated in frequency domain and demodulated using a tunable optical filter. The potential and limitation of the technique are discussed. A three-sensor FMCW multiplexed FBG array of parallel topology and a six-sensor hybrid FMCW/WDM system were experimentally demonstrated with -30 dB crosstalk between sensors and 2 µε resolution in terms of root mean square (RMS) strain value.
ISSN: 1077260X
DOI: 10.1109/2944.892615
Rights: © 2000 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
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