DISTORTION GENERATOR CIRCUIT, PRE-DISTORTION CIRCUIT, OPTICAL SIGNAL TRANSMITTER USING THE SAME, AND OPTICAL SIGNAL TRANSMISSION SYSTEM

摘要

It is an object of the present invention to provide a distortion generator circuit that generates a distortion substantially equal to that of an FM batch conversion circuit even when input electric signals in a wide frequency range are subjected to frequency modulation by the FM batch conversion circuit. It is another object of the present invention to provide a pre-distortion circuit that compensates for the distortion of the FM batch conversion circuit, an optical signal transmitter having less distortion, an optical signal transmission system by using the distortion generator circuit.;A distortion generator circuit of the present invention comprises a distribution circuit (21) that distributes an input electric signal into two electric signals, an FM batch conversion circuit (12) that subjects one output emitted from the distribution circuit to frequency modulation and outputs a frequency-modulated signal, an FM demodulation circuit (92) that subjects an output emitted from the FM batch conversion circuit to frequency demodulation and outputs a frequency-demodulated signal, an amplitude/delay adjustment circuit (38, 39) that subjects the other output emitted from the distribution circuit to amplitude adjustment and delay adjustment and outputsanamplitude-delay-adjustedsignal, andacombining circuit that combines an output emitted from the FM demodulation circuit and an output emitted from the amplitude-delay adjustment circuit and outputs a combined signal.