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Sensors 2011, 11(9), 8711-8720; doi:10.3390/s110908711

Remote (250 km) Fiber Bragg Grating Multiplexing System

Department of Electric and Electronic Engineering, Public University of Navarra, 31006 Pamplona, Spain
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Received: 4 July 2011 / Revised: 1 September 2011 / Accepted: 7 September 2011 / Published: 8 September 2011
(This article belongs to the Special Issue Optical Fiber Sensors 2012)
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Abstract

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 6–8 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. View Full-Text
Keywords: sensor multiplexing; remote sensing; Raman amplification; fiber Bragg gratings (FBGs) sensor multiplexing; remote sensing; Raman amplification; fiber Bragg gratings (FBGs)
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Fernandez-Vallejo, M.; Rota-Rodrigo, S.; Lopez-Amo, M. Remote (250 km) Fiber Bragg Grating Multiplexing System. Sensors 2011, 11, 8711-8720.

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