Patent ID: 6826210
Filing Date: 2004-11-30
Classification: H01S

Abstract:
A control circuit for a laser diode comprising:a bias current source for providing an adjustable bias current to the laser diode; a power controller for adjusting the bias current to the laser diode to change the power output of the laser diode, the power change having a corresponding wavelength shift effect on the nominal operating wavelength of the laser diode; a sensing circuit for sensing the bias current to the laser diode and generating a feedback signal in response to the sensed bias current; and a temperature control circuit that provides a control current to a thermoelectric element for controlling temperature operation and wavelength operation of the laser diode, wherein the temperature control circuit receives the feedback signal of the sensing circuit and a temperature monitor signal from a temperature sensor of the laser diode and adjusts the control current to the thermoelectric element responsive to the feedback signal of the sensing circuit and the temperature monitor signal such that operation of the laser diode is maintained around a nominal operating wavelength.