Tunable laser
AssigneeNEC Corporation
InventorHiroyuki Yamazaki
Life of this patent
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Abstract
A tunable laser has a multiple ring resonator comprising a plurality of ring resonators having respective ring-shaped waveguides and respective different optical path lengths, an input/output side optical waveguide coupled to the multiple ring resonator, an optical input/output device such as a laser diode coupled to the input/output side optical waveguide, a reflection side optical waveguide coupled to the multiple ring resonator, an optical reflector coupled to the reflection side optical waveguide, a wavelength varying mechanism for changing the resonant wavelength of the multiple ring resonator, and a filter for preventing light in high-order modes from being introduced into the multiple ring resonator and for propagating light in a fundamental mode in the multiple ring resonator.
Claims16
A tunable laser comprising:
- a multiple ring resonator comprising a plurality of ring resonators having respective ring-shaped waveguides and respective different optical path lengths;
- a first optical waveguide coupled to said multiple ring resonator;
- an optical input/output device coupled to said first optical waveguide;
- a second optical waveguide coupled to said multiple ring resonator;
- an optical reflector coupled to said second optical waveguide;
- a wavelength varying mechanism for changing the resonant wavelength of said multiple ring resonator;
- and
- a filter for preventing light in high-order modes from being introduced into said multiple ring resonator and for propagating light in a fundamental mode in said multiple ring resonator.
Dependencies are inferred from the claim text.