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Title: FMCW multiplexing of fiber Bragg grating sensors
Authors: Chan, PKC
Jin, W 
Demokan, S
Issue Date: Sep-2000
Source: IEEE journal on selected topics in quantum electronics, Sept./Oct. 2000, v. 6, no. 5, p. 756-763
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.
Keywords: Fiber Bragg grating sensors
Frequency-modulated continuous wave
Optical fiber sensors
Strain measurements
Publisher: Institute of Electrical and Electronics Engineers
Journal: IEEE journal on selected topics in quantum electronics 
ISSN: 1077-260X
EISSN: 1558-4542
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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