Title :
Ultra-long-distance fbg sensor system based on spectrum-limited fourier domain modelocking fibre laser with raman pumps
Author :
Fu, J.J. ; Liu, W.S. ; Chen, D. ; He, S.
Author_Institution :
Center for Opt. & Electromagn. Res., Zhejiang Univ., Hangzhou
Abstract :
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.
Keywords :
Bragg gratings; fibre lasers; fibre optic sensors; laser mode locking; optical fibre losses; optical noise; optical pumping; strain sensors; Raman amplifier; Raman pump; distance 76 km; fibre Bragg grating sensor; signal-noise ratio; spectrum-limited Fourier domain modelocking fibre laser; strain sensing; transmission loss; ultralong-distance FBG sensor system;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20081461