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Ultra-long-distance fbg sensor system based on spectrum-limited fourier domain modelocking fibre laser with raman pumps

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4 Author(s)
Fu, J.J. ; Center for Opt. & Electromagn. Res., Zhejiang Univ., Hangzhou ; Liu, W.S. ; Chen, D. ; He, S.

A novel ultra-long-distance (up to 76 km) fibre Bragg grating (FBG) sensor system based on a spectrum-limited Fourier domain modelocking fibre laser is proposed. Raman pumps are employed to form a Raman amplifier to compensate the transmission loss of the long fibre and ensure ultra-long-distance sensing. Strain sensing based on such an ultra-long-distance FBG sensor system is demonstrated with a signal-to-noise ratio over 22 dB and a sensitivity of 1.03 pm/muepsiv in the wavelength domain or 18.3 ns/muepsiv in the time domain.

Published in:

Electronics Letters  (Volume:44 ,  Issue: 16 )