Patent ID: 6832047
Filing Date: 2004-12-14
Classification: H04B,H04J,H04L

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