%0 Journal Article
%T Remote (250 km) Fiber Bragg Grating Multiplexing System
%A Montserrat Fernandez-Vallejo
%A Sergio Rota-Rodrigo
%A Manuel Lopez-Amo
%J Sensors
%D 2011
%I MDPI AG
%R 10.3390/s110908711
%X We propose and demonstrate two ultra-long range fiber Bragg grating (FBG) sensor interrogation systems. In the first approach four FBGs are located 200 km from the monitoring station and a signal to noise ratio of 20 dB is obtained. The second improved version is able to detect the four multiplexed FBGs placed 250 km away, offering a signal to noise ratio of 6¨C8 dB. Consequently, this last system represents the longest range FBG sensor system reported so far that includes fiber sensor multiplexing capability. Both simple systems are based on a wavelength swept laser to scan the reflection spectra of the FBGs, and they are composed by two identical-lengths optical paths: the first one intended to launch the amplified laser signal by means of Raman amplification and the other one is employed to guide the reflection signal to the reception system.
%K sensor multiplexing
%K remote sensing
%K Raman amplification
%K fiber Bragg gratings (FBGs)
%U http://www.mdpi.com/1424-8220/11/9/8711