FBG/DFB-induced chaotic self-mixing analysis and sensing applications

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4 Citations (Scopus)

Abstract

Optical feedback induced by a highly reflective fiber Bragg grating (FBG) onto a distributed feedback (DFB) laser is investigated. In static strain conditions, the covariance matrix of the chaotic noise generated by DFB/FBG self-mixing interference is decomposed into its eigenvalues. Then, by observing the eigenvalue pattern, it is possible to detect the strain applied to FBG independently from source power and electrical noise level. Furthermore, by employing a Capon spectral estimator, and splitting and filtering out the self-mixing eigenvalues, it is possible to dynamically detect acoustic signals in harsh signal-to-noise conditions. This technique provides dual static and dynamic FBG interrogation independent on optical power and fiber link losses variations.

Original languageEnglish
Pages (from-to)176-181
Number of pages6
JournalOptics and Laser Technology
Volume50
DOIs
Publication statusPublished - Apr 17 2013
Externally publishedYes

Keywords

  • FBG sensor
  • Fiber Bragg grating (FBG)
  • Self-mixing interferometry

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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