Wavelength-tunable stabilized laser
AssigneeFujitsu Limited
InventorsYutaka Kai, Hideyuki Miyata
Life of this patent
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Abstract
A wavelength-tunable stabilized laser is provided with a light source comprising a plurality of lasers capable of oscillating at a plurality of wavelengths, a light detecting part for detecting the light intensity of laser light output from the light source via a periodic filter, and a controlling part for generating oscillation of one of the lasers of the light source and controlling the oscillation wavelength of the laser so that the output value of the light detecting part becomes equal to a predetermined one of a plurality of target values. The wavelength-tunable stabilized laser is able to generate oscillation of laser light at a desired wavelength, of the plurality of wavelengths, and to stabilize the wavelength.
Claims14
A device comprising:
- a light source comprising a plurality of lasers capable of oscillating at a plurality of wavelengths;
- a periodic filter having a periodic transmittance-wavelength characteristic for receiving laser light output from said light source;
- light detecting means for receiving laser light output from said periodic filter and detecting light intensity of the received laser light;
- and
- controlling means for generating oscillation any one of said plurality lasers of at a desired wavelength and for controlling an oscillation wavelength of the laser so that an output value of said light detecting means becomes equal to a target value corresponding to said desired wavelength among a plurality of target values respectively set for each of said plurality of wavelengths.
A device comprising:
- a laser capable of oscillating at a plurality of wavelengths;
- a periodic filter for receiving laser light output from said laser, which transmittance-wavelength characteristic is temperature dependence in accordance with temperature dependence of an oscillation wavelength of said laser and;
- light detecting means for receiving laser light output from said periodic filter and detecting light intensity of the received laser light;
- and
- controlling means for generating oscillation of said laser at one of said plurality of wavelengths and controlling an oscillation wavelength of laser light output from said laser so that an output value of said light detecting means becomes equal to a target value that is commonly set for each of said plurality of wavelengths.
Dependencies are inferred from the claim text.