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Proceedings Paper

Investigation on optimized launch power in the distributed Brillouin fiber sensor design
Author(s): Y. D. Gong; Yongxin Guo; Ping Shum; Juanjuan Hu; H. Dong; S. N. Fu; M. Tang; X. L. Tian; Q. H. Lam; J. Z. Hao; O. L. C. Michael; J. H. Ng; V. Paulose
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Paper Abstract

Distributed sensors, based on Brillouin effect in the optical fiber, provide an excellent method for measuring temperature and strain over long distances. There are two types of such sensors. The first type is based on spontaneous Brillouin scattering, and is called Brillouin optical time domain reflectometer (BOTDR). It measures the Brillouin frequency shift or Brillouin power or Brillouin gain bandwidth to get the temperature and strain information. The second type of sensor is based on stimulated Brillouin amplification. It is called Brillouin optical time domain analyzer(BOTDA). Normally, it uses one laser at each fiber ends, one as pump and the other as a probe light. The probe light will experience Brillouin amplification. Through the analysis of Brillouin gain spectrum (BGS), we can get the temperature and strain information. Both the two types of sensors are attracting attention all over the world, and temperature resolution of less than 1 degree and strain resolution up to 5 με was reported. The fiber distances of up to 150km was presented while other papers reported a spatial resolution of the order of 1cm with frequency domain techniques or correlation techniques. We proposed and analyzed our design, it is an improvement of BOTDA with a single end laser, which make it easy to implement in field. Through simulations, optimized launch power has been found for a certain design.

Paper Details

Date Published: 21 November 2007
PDF: 5 pages
Proc. SPIE 6781, Passive Components and Fiber-based Devices IV, 67812I (21 November 2007); doi: 10.1117/12.741242
Show Author Affiliations
Y. D. Gong, Institute for InfoComm Research (Singapore)
Yongxin Guo, Institute for InfoComm Research (Singapore)
Ping Shum, Nanyang Technological Univ. (Singapore)
Juanjuan Hu, Nanyang Technological Univ. (Singapore)
H. Dong, Nanyang Technological Univ. (Singapore)
S. N. Fu, Nanyang Technological Univ. (Singapore)
M. Tang, Nanyang Technological Univ. (Singapore)
X. L. Tian, Nanyang Technological Univ. (Singapore)
Q. H. Lam, Nanyang Technological Univ. (Singapore)
J. Z. Hao, Institute for InfoComm Research (Singapore)
O. L. C. Michael, Institute for InfoComm Research (Singapore)
J. H. Ng, Institute for InfoComm Research (Singapore)
V. Paulose, Institute for InfoComm Research (Singapore)

Published in SPIE Proceedings Vol. 6781:
Passive Components and Fiber-based Devices IV
Ming-Jun Li; Jianping Chen; Satoki Kawanishi; Ian H. White, Editor(s)

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