Brillouin Optical-Fiber Time Domain Reflectometry (Special Issue on Optical Fiber Cables and Related Technologies)
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概要
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We report on Brillouin optical-fiber time domain reflectometry (BOTDR) for distributed temperature or strain measurement along a single-mode optical fiber. BOTDR uses Brillouin scattering in optical fibers, whose Brillouin frequency shift increases in proportion to temperature or strain induced in the fiber. This method requires access to only one end of a fiber, as with conventional optical time domain reflectometry (OTDR) which uses Rayleigh scattering in optical fibers. In BOTDR, a coherent optical detection method is used as a backscattered light detection technique. This technique can achieve both high sensitivity and high frequency resolution and easily separate a weak Brillouin line from a strong Rayleigh scattering peak and Fresnel reflected light. Experimental results show the potential for measuring temperature and strain distribution with respective accuracies of ±3℃ or ±0.006%, and a spatial resolution of 100m in an 11.57km long fiber.
- 1993-04-25
著者
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Koyamada Yahei
Dtpt.of Media&telecom.eng.
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Koyamada Yahei
Telecommunication Field Systems R & D Center Ntt
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Furukawa Shin-ichi
Telecommunication Field Systems R&D Center, NTT
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Horiguchi Tsuneo
Telecommunication Field Systems R&D Center, NTT
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Kurashima Toshio
Telecommunication Field Systems R & D Center, NTT
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Izumita Hisashi
Telecommunication Field Systems R & D Center, NTT
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Izumita Hisashi
Ntt Access Network Service Systems Laboratories Ntt Corporation
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Furukawa S
Ntt Access Network Systems Lab. Ibaraki‐ken Jpn
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Kurashima T
Nhk Tokyo Jpn
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Horiguchi Tsuneo
Shibaura Institute Of Technology
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Furukawa Shin-ichi
Telecommunication Field Systems R & D Center, NTT
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