Patent ID: 8520710
Filing Date: 2013-08-27
Classification: H01S

Abstract:
1. An optical transmission module, comprising: a bias current driver circuit adapted to input bias current set in response to a temperature of a laser diode to the laser diode; a modulation current driver circuit adapted to input modulation current set in response to the temperature of the laser diode to the laser diode; and a decision circuit adapted to decide whether or not an error of optical output power of the laser diode detected by a light reception device with respect to a target value of the optical output power of the laser diode at the set bias current and the set modulation current is equal to or higher than a threshold value; wherein the modulation current driver circuit inputs, while the error is equal to or higher than the threshold value, a correction modulation current higher than the set modulation current to the laser diode; the bias current driver circuit inputs a correction bias current for reducing the error to the laser diode; and the modulation current driver circuit inputs modulation current determined from an oscillation threshold current, a desired extinction ratio and the correction bias current as the correction modulation current to the laser diode, the oscillation threshold current indicates a current when oscillation by the laser diode is started.