| 摘要 |
PURPOSE:To obtain a wavelength stabilizing semiconductor laser having small irregularity of an optical output by providing a plurality of electrodes in the laser, and controlling independently the wavelength and the optical output by a plurality of electrodes when feeding back an error signal. CONSTITUTION:A semiconductor laser 1 having a plurality of electrodes 6a-6c divided in an optical axis direction, a wavelength discriminator 3 for discriminating the wavelength of the output light of the laser 1, a photodetector 4 for detecting the output light of the laser 1, and an amplifying calculator 5 for controlling independently the wavelength from the optical output by feeding back the output of the photodetector 4 to any of the electrodes 6a-6c of the laser 1 are provided. For example, the light from the laser 1 is incident through the discriminator 3 to the photodetector 4. When the discriminator is Fabry- Perot, the irregularity of the wavelength of the light from the laser 1 is converted to the amplitude of the electric signal from the photodetector 4. This irregularity is processed by the calculator 5 to be fed back to a plurality of electrodes 6a, 6b, 6c of the laser 1 restore to the shift of the wavelength to the original. |
