Patent ID: 6477190
Filing Date: 2002-11-05
Classification: H01S

Abstract:
An optical module comprising:a light-emitting element capable of varying an oscillation wavelength of the light output thereof by adjusting an operation temperature; a splitter splitting a light signal emitted from the light-emitting element; a first level detecting part receiving a first split light signal from the splitter; a second level detecting part receiving a second split light signal from the splitter via an optical filter; a first control part controlling the operation temperature of the light-emitting element in accordance with first and second electric signals output from the first and second level detecting parts, respectively; and a second control part controlling an operation temperature of the optical filter thereby to adjust a current oscillation wavelength of the light-emitting element to a desired oscillation wavelength, by detecting a current operating temperature of the optical filter, accessing a storage of plural reference values respectively corresponding to plural different operation temperatures of the optical filter set for respective, different oscillation wavelengths of the light-emitting element, selecting the respective reference operation temperature value corresponding to the desired oscillation wavelength and comparing the current operation temperature value with the selected reference operation temperature value so as to adjust the current operation temperature to the desired operation temperature.