150-km-range distributed temperature sensor based on coherent detection of spontaneous Brillouin backscatter and in-line Raman amplification
JOSA B, Vol. 22, Issue 6, pp. 1321-1324 (2005)
http://dx.doi.org/10.1364/JOSAB.22.001321
Acrobat PDF (194 KB)
Abstract
We report an extended-range distributed temperature sensor based on coherent detection of the frequency shift of the spontaneous Brillouin backscatter combined with Raman amplification. We achieved the Raman amplification within the sensing fiber using either a copropagating or counterpropagating Raman pump with respect to the probe pulse, and experiments were conducted to investigate the optimum pump and probe power combination. With a copropagating Raman pump a temperature resolution of 0.8°C was achieved at a sensing range of 100 km, and with a counterpropagating Raman pump a temperature resolution of 5.2°C was achieved at a sensing range of 150 km with 50-m spatial resolution.
© 2005 Optical Society of America
OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.6780) Instrumentation, measurement, and metrology : Temperature
(190.5650) Nonlinear optics : Raman effect
(290.1350) Scattering : Backscattering
(290.5830) Scattering : Scattering, Brillouin
(290.5860) Scattering : Scattering, Raman
Citation
Mohamed N. Alahbabi, Yuh T. Cho, and Trevor P. Newson, "150-km-range distributed temperature sensor based on coherent detection of spontaneous Brillouin backscatter and in-line Raman amplification," J. Opt. Soc. Am. B 22, 1321-1324 (2005)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-22-6-1321
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