APPARATUS AND METHOD FOR STABILIZING WAVELENGTH TUNABLE LASER
First Claim
1. An apparatus configured to stabilize an output of a laser, the apparatus comprising:
- an optical amplifier configured to oscillate light having a first wavelength band based on a laser modulation signal;
a filter configured to filter the light having the first wavelength band and output light having a second wavelength band narrower than the first wavelength band;
a reference signal generator configured to generate a reference signal by amplifying at least a portion of the light having the second wavelength band; and
a controller configured to minimize a time difference between the laser modulation signal and the reference signal using feedback of the time difference between the laser modulation signal and the reference signal.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus and method for stabilizing an output of a laser is provided. An optical amplifier oscillates light having a first wavelength band. A filter filters the light having the first wavelength band to output light having a second wavelength band narrower than the first wavelength band. The light having the second wavelength band may correspond to an output of a laser. To stabilize the wavelength center of the output laser, at least a portion of the light having the second wavelength band may be transferred to a fiber Bragg Grating (FBG) through a coupler. By performing feedback of a difference between the signal output from the FBG and a laser modulation signal, an offset corresponding to a lead zirconate titanate (PZT) operating parameter of a Fabry-Perot filter may be controlled to automatically stabilize the wavelength center.
7 Citations
16 Claims
-
1. An apparatus configured to stabilize an output of a laser, the apparatus comprising:
-
an optical amplifier configured to oscillate light having a first wavelength band based on a laser modulation signal; a filter configured to filter the light having the first wavelength band and output light having a second wavelength band narrower than the first wavelength band; a reference signal generator configured to generate a reference signal by amplifying at least a portion of the light having the second wavelength band; and a controller configured to minimize a time difference between the laser modulation signal and the reference signal using feedback of the time difference between the laser modulation signal and the reference signal. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. An apparatus configured to stabilize an output of a laser, the apparatus comprising:
-
a Fabry-Perot filter configured to filter light amplified by a semiconductor optical amplifier having the first wavelength band and provide light having a second wavelength band narrower than a first wavelength band; a fiber Bragg grating (FBG) configured to amplify a portion of the light having the second wavelength band provided from the Fabry-Perot filter to generate a reference signal; and a controller configured to maintain a differential of
1) a time difference between a laser modulation signal corresponding to a criterion for selecting the second wavelength band and the reference signal provided by the FBG, and
2) a difference in an oscillation time in a predetermined range of a normal operation of the laser to be less than a predetermined criterion by adjusting an offset of the Fabry-Perot filter. - View Dependent Claims (8, 9)
-
-
10. A method of stabilizing an output of a laser, the method comprising:
-
oscillating, by an optical amplifier, light having a first wavelength band, based on a laser modulation signal; filtering, by a filter, the light having the first wavelength band to provide light having a second wavelength band narrower than the first wavelength band; amplifying, by a reference signal generator, at least a portion of the light having the second wavelength band to generate a reference signal; and controlling, by a controller, the filter to stabilize a wavelength center of the output of the laser by performing feedback of a time difference between the laser modulation signal and the reference signal. - View Dependent Claims (11, 12, 13)
-
-
14. A method of stabilizing an output of a laser, the method comprising:
-
filtering, by a Fabry-Perot filter, light amplified by a semiconductor optical amplifier having the first wavelength band to provide light having a second wavelength band narrower than a first wavelength band; amplifying, by a fiber Bragg grating (FBG), a portion of the light having the second wavelength band provided from the Fabry-Perot filter to generate a reference signal; and controlling, by a controller, the laser modulation signal by performing feedback of a time difference between the reference signal and the laser modulation signal. - View Dependent Claims (15)
-
-
16. A non-transitory computer-readable recording medium comprising a program including instructions which when executed by a processing device using the program causes the processing device to:
-
control an optical amplifier to oscillate light having a first wavelength band in response to a laser modulation signal; receive from reference signal generator at least a portion of light having a second wavelength band amplified to generate a reference signal; and control a filter filtering the light having the first wavelength band to provide the light having the second wavelength band narrower than the first wavelength band to stabilize a wavelength center of the output of the laser using feedback of a time difference between the laser modulation signal and the reference signal.
-
Specification