OPTICAL TIME DOMAIN REFLECTOMETER AND METHOD

摘要

An optical time domain Reflectometer has means (40, 42) for generating three different wavelengths. Means (40, 42) is provided for alternating between one of the wavelengths ( lambda 1) and the other two wavelengths ( lambda 1+ DELTA lambda , lambda 1- DELTA lambda ) in response to a signal generator (44). This enables the provision of a test signal for transmission on an optical fibre transmission cable.