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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 45, Iss. 21 — Jul. 20, 2006
  • pp: 5132–5142

Adaptive demodulation of dynamic signals from fiber Bragg gratings using two-wave mixing technology

Yi Qiao, Yi Zhou, and Sridhar Krishnaswamy  »View Author Affiliations

Applied Optics, Vol. 45, Issue 21, pp. 5132-5142 (2006)

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A two-wave mixing (TWM) interferometer using photorefractive (PRC) InP:Fe crystal is configured to demodulate the spectral shift of a fiber Bragg grating (FBG) sensor. The FBG is illuminated with a broadband source, and any strain in the FBG is encoded as a wavelength shift of the light reflected by the FBG. The wavelength shift is converted into phase shift by means of an unbalanced TWM interferometer. TWM wavelength demodulation is attractive for monitoring dynamic strains because it is adaptive and multiplexable. Adaptivity implies that it can selectively monitor dynamic strains without active compensation of large quasi-static strains and large temperature drifts that otherwise would cause system to drift. Multiplexability implies that several FBG sensors can be simultaneously demodulated using a single demodulator. TWM wavelength demodulation is therefore a cost-effective method of demodulating several spectrally encoded FBG sensors.

© 2006 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.4230) Fiber optics and optical communications : Multiplexing
(120.2880) Instrumentation, measurement, and metrology : Holographic interferometry
(190.5330) Nonlinear optics : Photorefractive optics
(190.7070) Nonlinear optics : Two-wave mixing

ToC Category:
Nonlinear Optics

Original Manuscript: July 13, 2005
Manuscript Accepted: January 6, 2006

Yi Qiao, Yi Zhou, and Sridhar Krishnaswamy, "Adaptive demodulation of dynamic signals from fiber Bragg gratings using two-wave mixing technology," Appl. Opt. 45, 5132-5142 (2006)

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