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Improvement of signal-to-noise capabilities of a distributed temperature sensor using optical preamplification
K.De Souza1 and T.P.Newson
 Physics Department, University of the West Indies, St Augustine, Trinidad
An optical preamplifier system consisting of a 27 dB-gain erbium-doped fibre amplifier, a three-port circulator and a 47 GHz bandwidth in-fibre grating has improved the optical signal-to-noise capabilities of a Brillouin-based fibre-optic distributed temperature sensor by 17 dB. Using this system and operating at 1533 nm, a sensor with a range of 23 km, spatial resolution of 1.8m, measurement time of 9min and temperature resolution of 6K was implemented. The temperature resolution was attributed to contamination of the backscattered spontaneous Brillouin signal by the residual Rayleigh signal after optical filtering.
Measurement Science and Technology (2001) Vol.12 pp.952-957
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Copyright University of Southampton 2006