摘要 |
PROBLEM TO BE SOLVED: To provide a head end device capable of distributing a television broadcast signal of a desired level to the terminal side, if the number of television broadcast signal channels increases, in a CATV system for optical transmission of multichannel television broadcast signals.SOLUTION: To an optical transmitter 10 which is the head end device, a CATV signal including a terrestrial television broadcast signal and television broadcast signals (BS, CS signals) from a broadcast satellite and a communication satellite are input. In the optical transmitter 10, a splitter 12 splits the input signals into the CATV signal and the BS, CS signals. After amplifiers 14, 15 amplify each split signal to a predetermined level, E/O converters 16, 18 convert the signal into an optical signal, so that the optical signal is transmitted to a subscriber residence through transmission optical fibers 22, 24 and optical splitters 26, 28. |