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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 14 — Jul. 15, 2013
  • pp: 17186–17194

BOTDA measurements tolerant to non-local effects by using a phase-modulated probe wave and RF demodulation

Javier Urricelqui, Mikel Sagues, and Alayn Loayssa  »View Author Affiliations


Optics Express, Vol. 21, Issue 14, pp. 17186-17194 (2013)
http://dx.doi.org/10.1364/OE.21.017186


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Abstract

We demonstrate a Brillouin optical time domain analysis sensor based on a phase-modulated probe wave and RF demodulation that provides measurements tolerant to frequency-dependent variations of the pump pulse power induced by non-local effects. The tolerance to non-local effects is based on the special characteristics of the detection process, which provides an RF phase-shift signal that is largely independent of the Brillouin gain magnitude. Proof-of-concept experiments performed over a 20-km-long fiber demonstrate that the measured RF phase-shift spectrum remains unaltered for large frequency-dependent deformations of the pump pulse power. Therefore, it allows the use of a higher optical power of the probe wave, which leads to an enhancement of the detected signal to noise ratio. This can be used to extend the sensing distance, to improve the accuracy of the Brillouin frequency shift measurements, and to reduce the measurement time.

© 2013 OSA

OCIS Codes
(040.2840) Detectors : Heterodyne
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(290.5900) Scattering : Scattering, stimulated Brillouin

ToC Category:
Sensors

History
Original Manuscript: April 19, 2013
Revised Manuscript: June 7, 2013
Manuscript Accepted: June 19, 2013
Published: July 11, 2013

Citation
Javier Urricelqui, Mikel Sagues, and Alayn Loayssa, "BOTDA measurements tolerant to non-local effects by using a phase-modulated probe wave and RF demodulation," Opt. Express 21, 17186-17194 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-14-17186


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References

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