Optical transmission apparatus and method which adjust rise and fall time of signal light to be transmitted

摘要

An optical transmission apparatus and method for changing a rise time (t_r) and fall time (t_f) of a signal light to be transmitted, to reduce wavelength dispersion characteristics and nonlinear effect of a transmission path. A transmitter includes a t_rt_f adjusting circuit capable of adjusting t_r and t_f of a modulation signal so that the modulation signal is optimized in accordance with reception characteristics. A modulator then modulates a light with this adjusted modulation signal, and the modulated light is then transmitted to a receiver via a transmission path. Therefore, by transmitting the modulated light having changed t_r and t_f, the influence of wavelength dispersion characteristics and nonlinear effect of the transmission path can be offset, so that the waveform deterioration of signal light after transmission can be reduced.