High-speed interferometric FBG interrogator with dynamic and absolute wavelength measurement capability

Marcus Perry, Philip Orr, Pawel Niewczas, Michael Johnston

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A passive, interferometric wavelength demodulation technique has been extended to measure the absolute wavelengths of a multiplexed array of fiber Bragg grating sensors. The scheme retains its original strain resolution of 10 nε/√{Hz}. A proof-of-concept interrogation system was able to determine the absolute wavelength of Bragg peaks to within 20 pm (17 με). Static and dynamic Bragg grating strains were accurately demodulated in both absolute and relative wavelength measurement modes. This demonstration indicates that interferometric techniques are able to provide absolute, static and dynamic measurements of strain within a single platform.
Original languageEnglish
Pages (from-to)2897-2903
Number of pages8
JournalJournal of Lightwave Technology
Issue number17
Early online date2 Aug 2013
Publication statusPublished - 13 Sep 2013


  • bragg grating
  • calibrations
  • fibre optic sensors
  • light interferometry
  • static strain measurement

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