Abstract
Optical Time Domain Reflectometry (OTDR) is an efficient and reliable technique for locating fibre faults and determining the loss distribution along the tibre. An OTDR system operating at a wavelength of 1.65?m is more sensitive to fibre macro-bending and micro-bending losses than those at the region of 1.3/1.55?m, thus providing an early detection of system faults and reducing the risk of total system failure. The current limitation in the maximum dynamic range of OTDR systems is due to the low power of 1.65?m laser diodes. Raman amplification has been employed to amplify a 1.66?m laser diode pulse by 24.8dB before launching it down the end of a sensing fibre.
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