9 November 2000 A correlation-based continuous-wave technique for measuring Brillouin gain spectrum distribution along an optical fiber with centimeter-order spatial resolution
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Proceedings Volume 4185, Fourteenth International Conference on Optical Fiber Sensors; 418509 (2000) https://doi.org/10.1117/12.2302152
Event: Fourteenth International Conference on Optical Fiber Sensors, 2000, Venice, Italy
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.
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Kazuo Hotate, "A correlation-based continuous-wave technique for measuring Brillouin gain spectrum distribution along an optical fiber with centimeter-order spatial resolution", Proc. SPIE 4185, Fourteenth International Conference on Optical Fiber Sensors, 418509 (9 November 2000); doi: 10.1117/12.2302152; https://doi.org/10.1117/12.2302152
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