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Proceedings Paper

A correlation-based continuous-wave technique for measuring Brillouin gain spectrum distribution along an optical fiber with centimeter-order spatial resolution
Author(s): Kazuo Hotate
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Paper Abstract

A technique to measure Brillouin gain spectrum distribution along an optical fiber with cm spatial resolution is developed. This technique employs frequency-modulated pump and probe lightwaves, which are generated by a direct-frequency-modulation of a laser diode. The frequency difference of about 11GHz between the pump and prove are generated by two ways. The former is a precise way, and the latter is a simple way. The Brilloum gain spectrum is measured at the position of the fiber where the pump-probe correlation is high. The position to be measured is chosen through the frequency of the direct frequency modulation. While the conventional pulse-based technique suffers the spatial resolution limit of several meters imposed by the acoustic damping time, our correlation-based one circumvents it. A spatial-resolution of about 6.5 cm has been demonstrated with this technique. Moreover, a noise compensation technique is also presented.

Paper Details

Date Published: 9 November 2000
PDF: 11 pages
Proc. SPIE 4185, Fourteenth International Conference on Optical Fiber Sensors, 418509 (9 November 2000); doi: 10.1117/12.2302152
Show Author Affiliations
Kazuo Hotate, Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 4185:
Fourteenth International Conference on Optical Fiber Sensors
A. G. Mignani; H. C. Lefèvre, Editor(s)

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