CONTROLLING OPTICAL POWER AND EXTINCATION RATIO OF A SEMICONDUCTOR LASER

摘要

Disclosed herein are methods, apparatus, and systems to achieve substantially constant optical power and/or extinction ratio for a semiconductor laser (202). In one aspect, a microcontroller (206) of an optical transmitter (200) may adjust an electrical current that is provided to a semiconductor laser (202) based at least in part on a comparison of a first measured optical power of light emitted by the semiconductor laser (202) and a predetermined target optical power. The microcontroller (206) may then determine an electrical current that is capable of giving the semiconductor laser (202) a substantially constant extinction ratio by evaluating an equation with the first measured optical power and a second optical power measured after the controller (206) adjusts the electrical current.