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Optics Letters

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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