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.
Original language | English |
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Pages (from-to) | 756-763 |
Number of pages | 8 |
Journal | IEEE Journal on Selected Topics in Quantum Electronics |
Volume | 6 |
Issue number | 5 |
DOIs | |
Publication status | Published - 1 Sept 2000 |
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Atomic and Molecular Physics, and Optics