FMCW addressing of a fiber Bragg grating sensor array

P. K C Chan, Wei Jin, M. S. Demokan

Research output: Journal article publicationConference articleAcademic researchpeer-review


We report on the use of a frequency-modulated continuous wave (FMCW) technique 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 3-sensor FMCW multiplexed FBG array of parallel topology and a 6-sensor hybrid FMCW/WDM system were experimentally demonstrated with -30 dB crosstalk between sensors and 2 με resolution in terms of root-mean-square strain value.
Original languageEnglish
Pages (from-to)66-76
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1 Jan 2001
EventDistributed Fiber Optical Sensors and Measuring Networks - , Russian Federation
Duration: 1 Jan 2001 → …


  • Fiber Bragg grating sensors
  • Frequency-modulated continuous wave
  • Optical fiber sensors
  • Strain measurements

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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