Optical transmitter and optical communication system

摘要

Provided are an optical transmitter and an optical communication system which are improved in terms of both light transmission quality and reception sensitivity. A laser diode 12 is driven by driver 11 by a direct intensity modulation method and emits laser light. An intensity modulator 13, to which intensity-modulated light is input from the laser diode 12 and from which the intensity-modulated light is output, has an input/output characteristic such that the greater the power Pin of input light, the greater the ratio R (=Pout/Pin) between the power Pin of light input to the intensity modulator 13 and the power Pout of the light output from the intensity modulator 13.