Patent ID: 6822984
Filing Date: 2004-11-23
Classification: H01S

Abstract:
A device for testing a semiconductor laser module, the semiconductor laser module including a semiconductor laser, a wavelength monitor for detecting a wavelength of light output from the semiconductor laser, and a temperature control element for controlling a temperature of the semiconductor laser, the device comprising:a wavelength feedback circuit which compares a wavelength detected by the wavelength monitor with a target wavelength at which the semiconductor laser module is to be tested, and outputs a comparison signal corresponding to a result of the comparison; a processor which outputs a control signal corresponding to the comparison signal supplied from the wavelength feedback circuit; a temperature control power source which controls power to be supplied to the temperature control element based on the control signal supplied from the processor; a memory unit; and a wavelength measuring unit, connected to the semiconductor laser module, measuring a wavelength output from the semiconductor laser module when the semiconductor laser module is tested, wherein the processor obtains a correlation between the temperature of the semiconductor laser and the wavelength of the light output from the semiconductor laser based on a change in the temperature and on a change in the wavelength detected by the wavelength monitor, the changes being generated when changing the temperature of the semiconductor laser by controlling the power of the temperature control power source to be supplied to the temperature control element, and the processor stores the correlation into the memory unit.