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Optics Letters

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  • Vol. 25, Iss. 18 — Sep. 15, 2000
  • pp: 1331–1333

Brillouin-based fiber-optic distributed temperature sensor with optical preamplification

K. De Souza and T.P. Newson  »View Author Affiliations


Optics Letters, Vol. 25, Issue 18, pp. 1331-1333 (2000)
http://dx.doi.org/10.1364/OL.25.001331


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Abstract

Optical preamplification has been used in a fiber-optic distributed temperature sensor based on spontaneous Brillouin scattering and the use of direct detection, resulting in improved signal-to-noise ratios. The fiber-based optical preamplifier system comprises a three-port circulator, an erbium-doped fiber amplifier with a small-signal gain of 27 dB, and a fiber Bragg grating with 47-GHz bandwidth. An improvement of 17 dB in the optical signal-to-noise ratio for the Brillouin signal is demonstrated in a 23-km sensor. The limit to the signal-to-noise ratio is attributed to spontaneous–spontaneous beat noise generated at the photodetector by amplified spontaneous emission from the optical amplifier.

© 2000 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.2410) Fiber optics and optical communications : Fibers, erbium
(250.4480) Optoelectronics : Optical amplifiers

Citation
K. De Souza and T.P. Newson, "Brillouin-based fiber-optic distributed temperature sensor with optical preamplification," Opt. Lett. 25, 1331-1333 (2000)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-25-18-1331


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References

  1. K. De Souza, G. P. Lees, P. C. Wait, and T. P. Newson, Electron. Lett. 21, 2174 (1996).
  2. D. Culverhouse, F. Farahi, and D. A. Jackson, Electron. Lett. 25, 913 (1989).

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