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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 33, Iss. 21 — Nov. 1, 2008
  • pp: 2485–2487

Interrogation technique for a fiber Bragg grating sensing array based on a Sagnac interferometer and an acousto-optic modulator

Bin Zhou, Zuguang Guan, Chunsheng Yan, and Sailing He  »View Author Affiliations


Optics Letters, Vol. 33, Issue 21, pp. 2485-2487 (2008)
http://dx.doi.org/10.1364/OL.33.002485


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Abstract

We propose and experimentally demonstrate a novel real-time interrogation technique for a fiber Bragg grating (FBG) sensing system that is based on a frequency-shifted asymmetric Sagnac interferometer. FBG sensors are connected to the Sagnac loop by an optical coupler, and an acousto-optic modulator (AOM) is asymmetrically placed in the Sagnac loop. By linearly sweeping the driving frequency of the AOM, the environmental variation around each FBG sensor can be determined by measuring the spectrum of the interference signals of the two counterpropagating light beams reflected by the corresponding FBG. The system has the advantages of low cost and real-time sensing.

© 2008 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.5060) Fiber optics and optical communications : Phase modulation
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: July 7, 2008
Revised Manuscript: September 1, 2008
Manuscript Accepted: September 19, 2008
Published: October 24, 2008

Citation
Bin Zhou, Zuguang Guan, Chunsheng Yan, and Sailing He, "Interrogation technique for a fiber Bragg grating sensing array based on a Sagnac interferometer and an acousto-optic modulator," Opt. Lett. 33, 2485-2487 (2008)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-33-21-2485

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