Efficient fiber Bragg grating and fiber Fabry-Pe'rot sensor multiplexing scheme using a broadband pulsed mode-locked laser

G A Cranch, G M H Flockhart, C K Kirkendall

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A pulsed broadband mode-locked laser (MLL) combined with interferometric interrogation is shown to yield an efficient means of multiplexing a large number of fiber Bragg grating (FBG) or fiber Fabry-Perot (FFP) strain sensors with high performance. System configurations utilizing time division multiplexing (TDM) permit high resolution, accuracy, and bandwidth strain measurements along with high sensor densities. Strain resolutions of 23-60 n epsilon/Hz(1/2) at frequencies up to 800 Hz (expandable to 139 kHz) and a differential strain-measurement accuracy of +/- 1 mu epsilon are demonstrated. Interrogation of a low-finesse FFP sensor is also demonstrated, from which a strain resolution of 2 n epsilon/Hz(1/2) and strain-measurement accuracy of +/- 31 n epsilon are achieved. The system has the capability of interrogating well in excess of 50 sensors per fiber depending on crosstalk requirements. A discussion on sensor spacing, bandwidth, dynamic range, and measurement accuracy is also given.

Original languageEnglish
Pages (from-to)3798-3807
Number of pages10
JournalJournal of Lightwave Technology
Issue number11
Publication statusPublished - Nov 2005


  • efficient fiber Bragg grating
  • fiber Fabry-Pe'rot
  • sensor multiplexing scheme
  • broadband pulsed mode-locked laser
  • time division multiplexing
  • bandwidth
  • bragg gratings
  • capacitive sensors
  • fiber gratings
  • fiber lasers
  • laser mode locking
  • optical fiber sensors
  • optical pulses
  • sensor systems

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