FMCW multiplexing of fiber Bragg grating sensors

Peter K C Chan, Wei Jin, M. Süleyman Demokan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

34 Citations (Scopus)

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 languageEnglish
Pages (from-to)756-763
Number of pages8
JournalIEEE Journal on Selected Topics in Quantum Electronics
Volume6
Issue number5
DOIs
Publication statusPublished - 1 Sep 2000

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics

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