Modulation current compensation of laser for controlled extinction ratio using dither signal

摘要

A method of controlling an optical device includes inputting a dither current to the optical device, calculating a ratio of a first slope of a first characteristic curve to a second slope of a second characteristic curve, and calculating a modulation current based on the ratio. An apparatus for controlling an optical device includes a driver, which inputs a dither current. The apparatus also includes a controller. The controller calculates a first slope of a first characteristic curve, a second slope of a second characteristic curve, and a modulation current.