Patent ID: 6847663
Filing Date: 2005-01-25
Classification: H01S

Abstract:
1. A wavelength locker for an optical transmitter, the wavelength locker comprising: a semiconductor light source for protecting light for optical communication from the front face thereof, an oscillating wavelength of the semiconductor light source changing with a working temperature; a first heater for maintaining the working temperature of the semiconductor light source at a predetermined value; a detector for detecting the light projected from the rear face of the semiconductor light source; a Fabry-Perot filter interposed between the semiconductor light source and the detector including a spacer formed from a non-linear optical material, the transmittance of the Fabry-Perot filter shifts with respect to the wavelength corresponding to a change of the transmittance of the spacer; and a control circuit for changing the refractive index of the Fabry-Perot filter so that the Fabry-Perot filter exhibits a predetermined transmittance in relation to the oscillating wavelength of the semiconductor light source.