| 摘要 |
Disclosed is a wavelength locker and a method for locking wavelengths for an optical transmitter which includes a semiconductor light source for projecting light for optical communication from the front face thereof, the oscillating wavelength of the optical transmitter changing according to the working temperature, and a heater for maintaining the working temperature of the semiconductor light source at a predetermined value. The wavelength locker includes: a detector for detecting the light projected from the rear face of the semiconductor light source; a Fabry-Perot filter which is interposed between the semiconductor light source and the detector and comprises a spacer formed from a nonlinear optical material, the transmittance of the Fabry-Perot filter shifting with respect to the wavelength depending on the 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.
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