METHOD FOR TUNING SEMICONDUCTOR LASER

摘要

A method for controlling a semiconductor laser, which has a plurality of wavelength selection regions respectively having cyclic wavelength characteristics, includes: a step of controlling the refractive indexes of the wavelength selection regions; a step of confirming that the wavelength characteristics achieved by the refractive index control in each wavelength selection region change by one cycle or more compared with the wavelength characteristics achieved with a predetermined value of the refractive index in a state where the refractive index is not controlled; and a step of shifting the confirmed refractive index of the wavelength selection region by the unit of one cycle to the predetermined value.