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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 19 — Sep. 12, 2011
  • pp: 18721–18728

Variable-frequency lock-in detection for the suppression of beat noise in Brillouin optical correlation domain analysis

Ji Ho Jeong, Kwanil Lee, Kwang Yong Song, Je-Myung Jeong, and Sang Bae Lee  »View Author Affiliations


Optics Express, Vol. 19, Issue 19, pp. 18721-18728 (2011)
http://dx.doi.org/10.1364/OE.19.018721


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Abstract

We propose and experimentally demonstrate a novel lock-in detection method to avoid a beat noise in Brillouin optical correlation domain analysis (BOCDA) which appears in the sweep of the sensing position and deteriorates the measurement accuracy by distorting the acquired Brillouin gain spectrum. In our analysis, the origin of the beat noise is shown to be the fluctuation of the Brillouin gain induced by the chopping of the intensity-modulated pump wave, and the optimal relation between the modulation and the lock-in frequencies is developed as an effective solution to circumvent the beat noise.

© 2011 OSA

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.4080) Fiber optics and optical communications : Modulation
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
(290.5900) Scattering : Scattering, stimulated Brillouin

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: July 19, 2011
Revised Manuscript: August 27, 2011
Manuscript Accepted: August 31, 2011
Published: September 9, 2011

Citation
Ji Ho Jeong, Kwanil Lee, Kwang Yong Song, Je-Myung Jeong, and Sang Bae Lee, "Variable-frequency lock-in detection for the suppression of beat noise in Brillouin optical correlation domain analysis," Opt. Express 19, 18721-18728 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-19-18721


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