Wavelength-tunable laser apparatus and wavelength changing method thereof
AssigneeNEC Corporation
InventorsKenji Mizutani, Kenji Sato, Koji Kudo
Life of this patent
Estimating the term…
Abstract
An object is to provide a wavelength-tunable laser apparatus that prevents a grid-hopping upon wavelength change, and a wavelength changing method thereof. A wavelength-tunable laser apparatus 101 according to the present invention includes a semiconductor optical amplifier 102 and a periodic wavelength-selection filter 106. Further, the wavelength-tunable laser apparatus 101 includes a phase control unit 111 that concurrently controls a current applied to the semiconductor optical amplifier 102 and a phase tuning of a wavelength-tunable laser under an open-loop control. Thus, dark-tuning can be achieved.
Claims3
A wavelength changing method of a wavelength tunable laser apparatus comprising:
- decreasing a light output by concurrently controlling a current applied to a semiconductor optical amplifier and a phase tuning of a wavelength tunable laser under an open-loop control;
- changing a wavelength by controlling a current applied to a phase control region formed in the semiconductor optical amplifier;
- and
- increasing the light output by concurrently controlling the current applied to the semiconductor optical amplifier and the phase tuning of the wavelength tunable laser under the open-loop control.
Dependencies are inferred from the claim text.