Lees, G.P., Kee, H.H. and Newson, T.P.
OTDR system using Raman amplification of a 1.65µm probe pulse
Electronics Letters, 33, (12), . (doi:10.1049/el:19970688).
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A technique for increasing the dynamic of a 1.65µm OTDR system has been demonstrated. This is achieved by Raman amplification of the 1.65µm pulse within the sensing fibre using a co-propagating 1.53µm pulse generated from a Q-switched erbium doped fibre laser. An increase in dynamic range of 17.5dB has been demonstrated, providing an OTDR trace over 100km on the test fibre.
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