Abstract
A novel low-reflectivity Fiber Bragg Grating sensor system with a combination of time division multiplexing mode,a narrow wavelength swept laser is proposed and demonstrated for achieving multiple sensing points,long-distance,quasi-distributed measurement.Time division multiplexing mode and the low reflectivity Fiber Bragg Gratings which have the close center wavelength are used to monitor multiple points simultaneously.And,Er-doped fiber and Raman amplification method is proposed to extend the sensing distance.The middle of the system involves a Raman pump for amplifying FBG reflected signal,and the Erbium-doped fiber uses the remaining Raman pump power to generate amplification of spontaneous emission and amplify sensing signal.Experimental results show that an excellent optical SNR of 15 dB has been achieved for 200 km transmission distance.In the static strain and temperature experiments at the distance of 200 km,the linearities achieve more than 0.999.
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