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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 9 — Mar. 20, 2012
  • pp: 1229–1235

2 cm spatial-resolution and 2 km range Brillouin optical fiber sensor using a transient differential pulse pair

Yongkang Dong, Hongying Zhang, Liang Chen, and Xiaoyi Bao  »View Author Affiliations


Applied Optics, Vol. 51, Issue 9, pp. 1229-1235 (2012)
http://dx.doi.org/10.1364/AO.51.001229


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Abstract

We report a high-spatial-resolution and long-range distributed temperature sensor through optimizing differential pulse-width pair Brillouin optical time-domain analysis (DPP-BOTDA). In DPP-BOTDA, the differential signal suffers from a signal-to-noise ratio (SNR) reduction with respect to the original signals, and for a fixed pulse-width difference the SNR reduction increases with the pulse width. Through reducing the pulse width to a transient regime (near to or less than the phonon lifetime) to decrease the SNR reduction after the differential process, the optimized 8 / 8.2 ns pulse pair is applied to realize a 2 cm spatial resolution, where a pulse generator with a 150 ps fall-time is used to ensure the effective resolution of DPP-BOTDA. In the experiment, a 2 cm spatial-resolution hot-spot detection with a 2 °C temperature accuracy is demonstrated over a 2 km sensing fiber.

© 2012 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

History
Original Manuscript: September 7, 2011
Manuscript Accepted: December 7, 2011
Published: March 14, 2012

Citation
Yongkang Dong, Hongying Zhang, Liang Chen, and Xiaoyi Bao, "2 cm spatial-resolution and 2 km range Brillouin optical fiber sensor using a transient differential pulse pair," Appl. Opt. 51, 1229-1235 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-9-1229


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