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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 8 — Apr. 12, 2010
  • pp: 8671–8679

High spatial resolution distributed sensing in optical fibers by Brillouin gain-profile tracing

Tom Sperber, Avishay Eyal, Moshe Tur, and Luc Thévenaz  »View Author Affiliations


Optics Express, Vol. 18, Issue 8, pp. 8671-8679 (2010)
http://dx.doi.org/10.1364/OE.18.008671


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Abstract

A novel BOTDA technique for distributed sensing of the Brillouin frequency in optical fibers with cm-order spatial resolution is proposed. The technique is based upon a simple modulation scheme, requiring only a single long pump pulse for acoustic excitation, and no subsequent interrogating pulse. Instead, the desired spatial mapping of the Brillouin response is extracted by taking the derivative of the probe signal. As a result, the spatial resolution is limited by the fall-time of the pump modulation, and the phenomena of secondary “echo” signals, typically appearing in BOTDA sensing methods based upon pre-excitation, is mitigated. Experimental demonstration of the detection of a Brillouin frequency variation significantly smaller than the natural Brillouin linewidth, with a 2cm spatial resolution, is presented.

© 2010 OSA

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(290.5900) Scattering : Scattering, stimulated Brillouin
(350.5730) Other areas of optics : Resolution

ToC Category:
Sensors

History
Original Manuscript: February 8, 2010
Revised Manuscript: March 18, 2010
Manuscript Accepted: March 18, 2010
Published: April 9, 2010

Citation
Tom Sperber, Avishay Eyal, Moshe Tur, and Luc Thévenaz, "High spatial resolution distributed sensing in optical fibers by Brillouin gain-profile tracing," Opt. Express 18, 8671-8679 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-8-8671


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References

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