TDM of FBG sensors by use of a tunable laser source

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

Research output: Journal article publicationConference articleAcademic researchpeer-review

1 Citation (Scopus)


The results of an investigation of the performance of a TDM FBG sensor array using a tunable laser source are reported. The system performance is found to be limited by the extinction ratio of the optical pulse modulator used for pulse amplitude modulation. Formulas that relate the crosstalk to the extinction ratio of the optical pulse modulator, the modulation parameters of the tunable laser, and the optical path differences among sensing channels are derived. Computer simulation shows that an array of 20 FBG sensors with 3 με resolution can be realized with a commercially available single Mach-Zehnder type optical pulse modulator of -35 dB extinction ratio. Experiments with a 4-FBG sensor array demonstrated a strain resolution of about 3.98 με with an optical pulse modulator of about -24 dB extinction ratio.
Original languageEnglish
Pages (from-to)77-86
Number of pages10
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 gratings
  • First derivative technique
  • Optical fiber sensors
  • Time-division-multiplexing
  • Tunable laser

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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