Method of driving semiconductor laser with wide modulation band, optical communication method, semiconductor laser device, node, and optical communication system

摘要

This invention discloses the following. Two modulation currents are injected into different electrodes of a semiconductor laser having a plurality of electrodes. The relationship between the phases of the two modulation currents is so adjusted that an output waveform is not distorted especially when a modulation frequency is low. Polarization modulation is applied as the modulation form.