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Ultra-Long-Distance Fiber Bragg Grating Sensor System

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6 Author(s)
Saitoh, T. ; Core Technol. R&D Center, Kanagawa ; Nakamura, K. ; Takahashi, Y. ; Iida, H.
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A long-distance fiber Bragg grating (FBG) sensor system has been developed using a wavelength-swept light source with output power turned on-off and timing synchronized to the sweep signal to reduce optical noise caused by Rayleigh scattering generated from the transmission fiber. This system can detect changes in the FBG reflection wavelengths even if the FBG is 120 km from the sensing position.

Published in:

Photonics Technology Letters, IEEE  (Volume:19 ,  Issue: 20 )