Simultaneous Detection of Multiple Fiber-Optic Fabry-Perot Interferometry Sensors with Cepstrum-Division Multiplexing

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6 Citations (Scopus)

Abstract

Increasing the capacity of an array of sensors is a major challenge in fiber-optic sensing networks. Whereas fiber Bragg grating (FBG) sensors can be discriminated in the spectrum domain, through the popular wavelength-division-multiplexing (WDM) approach, Fabry-Perot interferometry (FPI) sensors have a broad spectrum and are not suitable for WDM. In this paper, a novel approach for the simultaneous detection of multiple FPI sensors is proposed. The key is decoding sensors in the optical cepstrum (spectrum of the optical spectrum) domain, using a Capon estimator. Subsequently, the small cepstrum shifts are accurately detected with a fast-phase correlation method. This approach is labeled cepstrum-division multiplexing (CDM). CDM has been tested on a simulated FPI array, with a coarse wavelength grid typical of most FBG interrogators. Unambiguous and simultaneous detection of 20-39 sensors is achieved, improving over previous methods limited to 1-3 sensors; 0.04-nm accuracy on cavity length estimation has been achieved. A preliminary experimental demonstration has been set up to validate the CDM approach.

Original languageEnglish
Article number7482655
Pages (from-to)3622-3627
Number of pages6
JournalJournal of Lightwave Technology
Volume34
Issue number15
DOIs
Publication statusPublished - Aug 1 2016

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Keywords

  • Capon estimator
  • extrinsic Fabry-Perot interferometry (EFPI)
  • Fabry-Perot interferometry (FPI)
  • fiber optic sensors (FOS)
  • optical fiber sensor networks
  • sensor detection

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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