Apparatus for output light with wavelength tunable function and method to determine oscillation wavelength of wavelength tunable laser diode

摘要

An apparatus for output light with a wavelength tunable function, includes: a semiconductor laser diode (LD) including regions to determine an oscillation wavelength, the regions providing respective diffraction gratings and electrodes to control refractive index of the regions; a temperature controller for mounting the LD thereon to control a temperature of the LD; and a controller configured to vary the refractive index of the regions by providing control signals to the electrodes and another control signal to the temperature controller for varying the temperature of the LD to coincide the oscillation wavelength with a target wavelength.

主权项

1. An apparatus for output light with a wavelength tunable function, comprising:
a semiconductor laser diode (LD) including:
regions to determine an oscillation wavelength, each region including a diffraction grating and an electrode to control a refractive index of that region; andat least one gain electrode disposed between the electrode of one of the regions and the electrode of another of the regions; a first temperature controller for mounting the LD thereon to control a temperature of the LD; a unit to detect the oscillation wavelength; a second temperature controller that mounts the unit and is separated from and independent of the first temperature controller; and a controller configured to vary the respective refractive indices of the regions by providing control signals to the electrodes to oscillate the LD and after that providing another control signal to the first temperature controller for varying the temperature of the LD to coincide the oscillation wavelength with a target wavelength based on the oscillation wavelength detected by the unit.