Patent ID: 6501774
Filing Date: 2002-12-31
Classification: H01S,H04B,H04J

Abstract:
An optical transmission apparatus for multiple wavelengths comprising:a light source generating light having a wavelength which changes according to temperature; temperature control means for controlling a temperature of said light source; and a wavelength control loop detecting wavelengths of light output from said light source and feedback controlling an operation of said temperature control means based on the detected optical output wavelengths, to thereby capture said optical output wavelengths which are within a predetermined wavelength capture range into the vicinity of a target wavelength, wherein: said optical transmission apparatus for multiple wavelengths further comprises a temperature control loop detecting the temperature of said light source and feedback controlling the operation of said temperature control means in accordance with the detected temperature, so that the optical output wavelengths of said light source fall within a wavelength capture range corresponding to the target wavelength of said wavelength control loop, said wavelength control loop detects the optical output wavelengths of said light source using a wavelength detection filter having a periodic transmission wavelength characteristic capable of setting a plurality of stable points for a wavelength capture operation, and starts the wavelength capture operation after an operation of said temperature control loop has stabilized, and said wavelength control loop incorporates a control polarity switching section which reverses a control direction of the capture operation in accordance with switching of the target wavelength.