OPTICAL TRANSMITTER AND OPTICAL COMMUNICATION SYSTEM

摘要

An optical transmitter and an optical communication system comprising it imparted with a wavelength independent function. The optical communication system comprises an optical modulator (11), a photocoupler (12) for branching the optical output signal from the optical modulator, a cross-point monitor means (13) for receiving one optical signal branched by the photocoupler and monitoring the cross-point of the optical output signal from the optical modulator, a reference value setting means (14) for setting such a bias reference value to be imparted to the optical modulator as the cross-point becomes constant based on the output signal from the cross-point monitor means, and a bias circuit (15) for applying a predetermined bias to the optical modulator based on the bias reference value outputted from the reference value setting means.