Patent ID: 7110672

Claim:
A system for optically transmitting a frequency-multiplexed signal with a plurality of signals frequency-multiplexed, comprising: a detector, provided with the frequency-multiplexed signal, outputting a detection signal corresponding to an amplitude variation of the frequency-multiplexed signal; an amplitude controller adjusting an amplitude of said frequency-multiplexed signal by referring to the detection signal outputted from said detector, and outputting a suppressed multiplexed signal, which is the frequency-multiplexed signal with an instantaneous amplitude variation suppressed; a multiplexer multiplexing the suppressed multiplexed signal outputted from said amplitude controller and the detection signal outputted from said detector to produce a multiplexed signal; a modulator modulating the multiplexed signal outputted from said multiplexer to produce a predetermined modulated signal; an optical transmitter converting the modulated signal outputted from said modulator into an optical signal; an optical receiver converting the optical signal sent from said optical transmitter into an electrical signal; a demodulator demodulating the electrical signal outputted from said optical receiver to produce a demodulated signal; a separator separating the suppressed multiplexed signal and the detection signal from the demodulated signal outputted from said demodulator; and an amplitude adjuster adjusting, by referring to the detection signal outputted from said separator, an amplitude of the suppressed multiplexed signal outputted from said separator to output the frequency-multiplexed signal corresponding to the frequency-multiplexed signal provided to said detector.