FSK heterodyne multichannel television distribution system for 140 Mbit/s

A coherent, optical, multichannel television distribution system with 140 Mbit/s CMI-coded, optical FSK modulation, is described. The system is operated over 11 km monomode optical fibres. The transmitter modules are controlled via a polarisation-independent monitoring unit, using optical fibre technology. The superheterodyne receivers are equipped with an optical polarisation-diversity input. A sensitivity of -48.8 dBm is achieved, with an intermediate frequency linewidth of more than 80 MHz. System performance parameters are detected over a time-period of 54 hours