| 摘要 |
PURPOSE:To improve the convenience of the system by utilizing the optical space transmission system so as to send plural signals simultaneously. CONSTITUTION:An input signal at a sender side is inputted to a module corresponding to a CH in response to the signal, that is, a composite MODEM 21 and modulated by an intermediate frequency of the CH and multiplexed with a modulation signal from other module. Then the signal is converted into an optical signal by an optical space transmitter 31 and the signal is sent as an optical signal. Then the optical signal received at a reception side is converted into an electric signal by the optical space transmitter 31 and demultiplexed into respective frequency signals and inputted to a module of the composite MODEM 21 corresponding to the CH of each frequency, demodulated and outputted as an output signal. |
