Optical transmitter, wavelength (division) multiplex optical transmitter, time division multiplex optical transmitter, optical receiver, wavelength (division) multiplex optical receiver, time division multiplex optical receiver, and an optical trasmission system using these devices

摘要

The invention is directed toward realizing an optical transmitter, a wavelength division multiplex optical transmitter, a time division multiplex optical transmitter, an optical receiver, a wavelength division multiplex optical receiver, a time division multiplex optical receiver, and an optical transmission system using these devices, in which the signal-to-noise ratio of a signal beam is improved. Each transmitter and receiver is provided with a saturable absorbing optical element having a saturable absorbing region that receives and outputs a signal beam.