Patent ID: 6947457
Filing Date: 2005-09-20
Classification: H01S

Abstract:
1. A DFB laser driving device for driving a DFB laser to output optical signals having a predetermined wavelength an a predetermined output level, the DFB laser driving device comprising: an input unit adapted to input set values of a wavelength and an output level; an approximate temperature calculating section adapted to calculate an approximate temperature of the DFB laser based on the set values of the wavelength and output level; an output level variation calculating section adapted to calculate an output level variation of the DFB laser based on the approximate temperature; an output level controlling section adapted to calculate a value based on the output level variation and the set value of the output level, so as to control the output level of the DFB laser based on the calculated value; and a temperature controlling unit adapted to calculate a set temperature of the DFB laser based on the calculated value and the set value of the wavelength so as to control the temperature of the DFB laser based on the set temperature of the DFB laser.