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US 6,785,306 B2Granted
Wavelength-tunable stabilizer laser
AssigneeFujitsu Limited
InventorsYutaka Kai, Hideyuki Miyata
Life of this patent
Estimating the term…
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.
Claims18
A device comprising:
- a light source having a plurality of lasers to oscillate at a plurality of wavelengths;
- an etalon 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 etalon filter and detecting light intensity of the received laser light;
- and
- controlling means for generating oscillation of any one of said plurality of lasers 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.
2 more elements
A device comprising:
- a laser to oscillate at a plurality of wavelengths;
- an etalon 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;
- light detecting means for receiving laser light output from said etalon 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 set for each of said plurality of wavelengths.
2 more elements
An apparatus, comprising:
- a light source having a plurality of lasers to oscillate at a plurality of wavelengths;
- an etalon filter having a periodic transmittance-wavelength characteristic to receive laser light output from said light source;
- a light detecting unit to receive laser light output from said etalon filter, and to detect light intensity of the received laser light;
- and
- a control unit to generate oscillation of any one of said plurality of lasers at a desired wavelength, and to control the oscillation wavelength of the laser so that an output value of said light detecting unit 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.
2 more elements
An apparatus, comprising:
- a light source having a plurality of lasers to oscillate at a plurality of wavelengths;
- etalon filters, each having a periodic transmittance-wavelength characteristic to receive laser light output from said light source;
- light detecting units to correspond to said etalon filters, respectively, to receive laser light output from said etalon filters, and to detect light intensity of the received laser light;
- and
- a control unit to generate oscillation of any one of said plurality of lasers at a desired wavelength, and to control the oscillation wavelength of the respective laser of said plurality of lasers so that an output value of the respective light detecting unit 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.
2 more elements
An apparatus, comprising:
- a light source having a plurality of lasers to oscillate at a plurality of wavelengths;
- a light detecting unit to receive laser light output from an etalon filter, and to detect light intensity of the received laser light;
- and
- a control unit to generate oscillation of one of said lasers at a desired wavelength, and to control the oscillation wavelength of the laser so that an output value of said light detecting unit becomes equal to a target value corresponding to said desired wavelength.
1 more element
A method comprising:
- oscillating a plurality of wavelengths output from a plurality of lasers of a light source;
- receiving laser light output from said light source with an etalon filter having a periodic transmittance-wavelength characteristic;
- receiving laser light output from said etalon filter and detecting light intensity of the received laser light;
- and
- generating oscillation of one of said plurality of lasers at a desired wavelength, and controlling the oscillation wavelength of the laser so that an output value of said detecting 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.
2 more elements
Dependencies are inferred from the claim text.