Patent ID: 8275011

Claim:
An optical transmission module, comprising: a laser source; a laser source temperature detector for detecting a temperature of the laser source, wherein the temperature of the laser source monotonously increases or monotonously decreases with respect to a wavelength of a laser light output from the laser source; a wavelength calculation section for detecting a transmittance of the laser light through an optical filter, wherein the transmittance of the laser light periodically varies with respect to the wavelength of the laser light; an optical output calculation section for detecting an intensity of the laser light output from the laser source, wherein the intensity of the laser output monotonously increases or monotonously decreases with respect to a light intensity of the laser light; and a wavelength drift detector for detecting a wavelength drift of the laser light from a target wavelength based on the temperature detected by the laser source temperature detector, the transmittance detected by the wavelength calculation section, and the intensity detected by the optical output calculation section.