Patent ID: 7492796
Filing Date: 2009-02-17
Classification: H01S

Abstract:
1. A method of automatically controlling an output power of a laser diode, the method comprising: generating an error voltage between an output voltage of the laser diode sampled during an automatic power control period and a reference voltage, the output voltage being an effective output voltage within a predetermined range; and performing proportional-integral processing on the error voltage to generate a compensated control voltage and applying the compensated control voltage to the laser diode, wherein the compensated control voltage applied to the laser diode is an effective control voltage within a predetermined range, wherein the generation of the error voltage comprises: sampling the output voltage of the laser diode during the automatic power control period; extracting the sampled output voltage that exists within a range between a first maximum and a first minimum as the effective output voltage; calculating an average effective output voltage; and generating the error voltage between the average effective output voltage and the reference voltage.