Optical device
AssigneeNEC Corporation
InventorTadashi Kasamatsu
Life of this patent
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Abstract
An optical waveguide including a single-mode waveguide in which an induced radiation ray generated by exciting the ion propagates in a single-mode in both of a thickness direction and a width direction in the single-mode waveguide; and multi-mode waveguides disposed along both of side surfaces of the single-mode waveguide in which the ray propagates in a single-mode in a thickness direction of the multi-mode waveguide and propagates in a multi-mode in a width direction. In accordance with the present invention, the exciting ray is easily absorbed because the ray propagates to cross the single-mode waveguide without a skew-mode propagation, and the laser and the photo-amplifier which can obtain a higher output in the single-mode is provided.
Claims13
An optical device comprising:
- an optical substrate;
- a single-mode waveguide overlying the optical substrate and containing rare-earth group ions and/or transition metal ions, the single-mode waveguide propagating an induced radiation ray, generated by exciting the ions, as a single-mode wave in both a thickness direction and a width direction;
- and
- a pair of multi-mode waveguides, disposed along both side surfaces of the single-mode waveguide, for propagating an exciting ray for exciting the rare-earth group ions and/or the transition metal ions, the exciting ray propagating as a single-mode wave in a thickness direction of the multi-mode waveguide and as a multi-mode wave in a width direction.
An optical device comprising:
- an optical substrate;
- a single-mode waveguide overlying the optical substrate and containing rare-earth group ions and/or transition metal ions, the single-mode waveguide propagating an induced radiation ray, generated by exciting the ions, as a single-mode wave in both a thickness direction and a width direction;
- and
- a pair of multi-mode waveguides, disposed along both side surfaces of the single-mode waveguide, for propagating an exciting for exciting the rare-earth group ions and/or the transition metal ions, as a multi-mode wave,
- at least a part of each of the multi-mode waveguides including a tapered shape having a reduced width toward a propagation direction of the exciting ray.
Dependencies are inferred from the claim text.