Modulation of laser diodes.

摘要

An object of the present invention is to realize an optical semiconductor device circuit including a MI-DFB-LD capable of minimizing the extension in wavelength of output light in order to improve a transmission speed and transmission distance. The optical device circuit includes a semiconductor laser diode 1; an optical modulator 2 for modulating output light of the semiconductor laser diode 1; resistor means 5 which is connected to the laser diode 1 and operates as a resistor in a high frequency range; common connection means connected in common to the semiconductor laser diode 1 and to the optical modulator 2; impedance means or signal reflection means 8 connected to the common connection means 3; and ground means connected to the impedance means or the signal reflection means.