Interferometric time division FBG interrogator and multiplexer with static, dynamic, and absolute wavelength measurement capabilities

Philip Orr, Alan Paterson, Pawel Niewczas

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We report on the design and preliminary testing of an interferometric interrogator capable of large-scale time-division multiplexing of FBG sensors. The scheme employs a passive algorithm for phase demodulation, allowing changes in FBG sensor reflected wavelengths to be calculated instantaneously upon arrival, and incorporates a technique for identification of initial absolute sensor wavelengths in order to overcome the measurement ambiguity associated with interferometric schemes. The proposed system will allow for high-speed interrogation of large-scale FBG sensor arrays with interferometric resolution and the capability for dynamic, static, and absolute FBG wavelength measurement.
Original languageEnglish
Title of host publicationSPIE Proceedings Vol. 8421
Subtitle of host publicationOFS2012 22nd International Conference on Optical Fiber Sensors
EditorsYanbiao Liao, Hoilut Ho, Wei Jin, David D. Sampson, Ryozo Yamauchi, Youngjoo Chung, Kentaro Nakamura, Yunjiang Rao
Number of pages4
Publication statusPublished - 4 Oct 2012
Event22nd International Conference on Optical Fiber Sensors - Beijing, China
Duration: 15 Oct 201219 Oct 2012


Conference22nd International Conference on Optical Fiber Sensors


  • interferometric time division
  • FBG interrogator
  • multiplexer
  • interferometric interrogator

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