Apparatus for output light with wavelength tunable function and method to determine oscillation wavelength of wavelength tunable laser diode
AssigneeSumitomo Electric Device Innovations, Inc.
InventorHirokazu Tanaka
Life of this patent
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Abstract
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.
Claims16
An apparatus for output light with a wavelength tunable function, comprising:
- 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.
An apparatus for output light with a wavelength tunable function, comprising:
- a semiconductor laser diode (LD) including regions having respective diffraction gratings therein and respective electrodes on the regions, the electrodes controlling respective refractive index of the regions;
- a temperature controller for mounting the LD thereon to control a temperature of the LD;
- a controller;
- and
- a memory coupled to the controller,
- wherein the memory stores control parameters to be provided to the electrodes and the temperature controller, the parameters corresponding to a plurality of target wavelengths.
An apparatus for output light with a wavelength tunable function, comprising:
- a semiconductor laser diode (LD) including regions having respective diffraction gratings therein and respective electrodes on the regions, the electrodes controlling respective refractive index of the regions;
- a first temperature controller that mounts the LD thereon to control a temperature of the LD;
- an etalon filter optically coupled with the LD;
- and
- a second temperature controller that mounts the etalon filter thereon.
A method to determine an oscillation wavelength of a wavelength tunable laser diode (LD) that includes regions having respective diffraction gratings therein and respective electrodes on the regions, the regions showing spectra specific thereto including a plurality of peaks, the method comprising steps of:
- providing control signals to respective electrodes to determine an oscillation wavelength at which one of peaks of one of regions coincides with one of peaks of another of regions;
- and
- providing another control signal to a temperature controller that mounts the wavelength tunable LD thereon, the another control signal varying a temperature of the LD such that the oscillation wavelength of the wavelength tunable LD becomes substantially equal to a target wavelength.
Dependencies are inferred from the claim text.