| 摘要 |
PURPOSE:To easily revise the system with simple constitution and to improve the reliability. CONSTITUTION:An input signal from each of channels (CH) 1-n is inputted respectively to a modulator 1 modulating the signal at a specific frequency and modulated into an intermediate frequency and mixed with a prescribed frequency from respective oscillators 3a-3n at a mixer 2 and then frequency- converted. Then the result is fed to band pass filters 4a-4n and frequency multiplex is implemented in a multiplexer 5, amplified by a succeeding amplifier 6 and sent as an optical signal from an optical space transmitter 7 (optical transmission). On the other hand, the optical signal received by an optical space transmitter 8 (light receiver) is amplified by an amplifier 9 and demultiplexed into respective frequencies by a demultiplexer 10 and fed to respective band pass filters 11a-11n, the frequency is inversely converted by a mixer 12 and the result is inputted to a demodulator 14, in which the signal is demodulated into the original signal. |
