Patent ID: 8503888

Claim:
An optical communication module comprising: a first semiconductor chip having a laser diode outputting an optical signal being formed on the first semiconductor chip; a first wiring; and a second semiconductor chip connected to the first semiconductor chip via the first wiring, and having a driver circuit driving the laser diode by a first current being formed on second semiconductor chip, wherein a driver control circuit, detecting a temperature variation of the first semiconductor chip transferred in heat via the first wiring and correcting the magnitude of the first current based on a detection result, is further formed on the second semiconductor chip; the driver control circuit includes a temperature detecting circuit generating a first voltage increased in proportion to temperature and generates a driver control voltage obtained by adding a predetermined offset voltage to the first voltage; the driver circuit includes a variable current source generating a current having a magnitude corresponding to the driver control voltage and determining a reference value of the first current; and the temperature detecting circuit includes: first and second diodes having mutually different areas, a constant current circuit causing an equal current to flow in the first diode and the second diode, and a first amplifier circuit amplifying a voltage difference between a voltage generated at the first diode and a voltage generated at the second diode so as to output the first voltage.