SIGNAL TRANSMISSION APPARATUS AND A METHOD OF SIGNAL TRANSMISSION

摘要

An apparatus and method of transmitting a plurality of polarised signals having different wavelengths through a length of signal transmission cable which changes the polarisation of the signals in correspondence with their amplitudes and wavelengths. A dynamic capable of differential adjustment of the amplitudes of the signals and a polarising element are provided in series with the length of signal transmission cable and the amplitudes of the different wavelengths signals are so adjusted that the polarisation states of the signals move towards alignment with the low-loss axis of the polarising element. An advantage provided by the apparatus and method is that the high- amplitude signals are aligned with the low-loss axis of the polarising member while low-amplitude noise is aligned with the high-loss axis of the polarising element, resulting in an improvement in signal-to-noise ratio.