CATV distribution networks using light wave transmission lines

摘要: A communications network uses optical fibers to carry amplitude modulated broadband CATV signals over a considerable distance (6-30 km) fiber node. Electrical transmitters at the headend launch, and electrical receivers node receive, corresponding signals. Distribution from subscribers is obtained by transmitting through limited cascade of amplifiers an transmission line (coaxial cable). The much shorter than span may include trunk which are insufficient in number add significant losses or distortion. Line extender be connected output couplers located off premises then carried via cables subscribers. In order reduce harmonic distortion portion network, all spectrum translated frequency range less octave. One more additional used for channels upper band need not translated. received back its original combined with other portions provide signal distribution