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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 22 — Aug. 1, 2009
  • pp: 4297–4301

Differential Brillouin gain for improving the temperature accuracy and spatial resolution in a long-distance distributed fiber sensor

Yongkang Dong, Xiaoyi Bao, and Wenhai Li  »View Author Affiliations

Applied Optics, Vol. 48, Issue 22, pp. 4297-4301 (2009)

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We demonstrate a 12 km differential pulse-width pair Brillouin optical time-domain analysis (DPP- BOTDA) using 40 ns and 50 ns pulses with DC-coupled detection. A spatial resolution of 1 m and a narrowband Brillouin gain spectrum of 33 MHz are obtained simultaneously compared with 88 MHz with the use of 10 ns pulses in a conventional BOTDA. The experimental results show that the differential Brillouin gain of a 40 / 50 ns pulse pair is 7 times stronger than the direct Brillouin gain of BOTDA with the use of a 10 ns pulse, and the temperature uncertainty is 0.25 ° C compared with 1.8 ° C for a 10 ns pulse. As the pulse-width difference decreases from 10 ns to 1 ns , corresponding to a spatial resolution from 1 m to 10 cm , the prediction of temperature uncertainty will only increase from 0.25 ° C to 0.8 ° C for DPP-BOTDA over a 12 km long single-mode fiber.

© 2009 Optical Society of America

OCIS Codes
(290.5900) Scattering : Scattering, stimulated Brillouin
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Remote Sensing and Sensors

Original Manuscript: May 4, 2009
Manuscript Accepted: June 24, 2009
Published: July 21, 2009

Yongkang Dong, Xiaoyi Bao, and Wenhai Li, "Differential Brillouin gain for improving the temperature accuracy and spatial resolution in a long-distance distributed fiber sensor," Appl. Opt. 48, 4297-4301 (2009)

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