Patent ID: 7460572
Filing Date: 2008-12-02
Classification: H01S

Abstract:
1. A method for monitoring and controlling wavelengths of an optical transmitter module or optical transmitter and receiver module internally including: a measurement portion for measuring a laser diode temperature and bias current or only the temperature; a storage portion in which the relationship between the temperature, bias current and wavelengths or between the temperature and wavelengths is stored; a central controlling portion for controlling the measurement portion and the storage portion; and a temperature adjusting portion composed of a temperature controlling device, wherein the method comprising steps of: calculating wavelength information on the basis of the temperature and bias current or only the temperature measured by the measurement portion, and the relationship between the laser diode temperature and wavelengths or between the laser diode temperature, bias current and wavelengths stored in the storage portion; comparing predetermined minimum and maximum threshold values, with the wavelength information calculated in the step of calculating wavelength information; raising the internal temperature by the temperature adjusting portion when the result of the comparing step is smaller than or equal to the minimum threshold value; and lowering the internal temperature by the temperature adjusting portion when the result of the comparing step is larger than or equal to the maximum threshold value.