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US 2012/0230635 A1Published application
Optical coupling device and optical coupling-branching device
AssigneeKabushiki Kaisha Toshiba
InventorHaruhiko Yoshida
Life of this patent
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Abstract
In an optical coupling device, a main waveguide have a linearly extending portion and a tapered portion formed on a first clad layer. The waveguide has a width which is gradually reduced towards an incident side of the light wave. Auxiliary waveguides are formed on the both sides of the main waveguide, wherein each of the auxiliary waveguides has first and second tapered portions having widths which are gradually reduced toward both sides. A second clad layer is so formed as to cover the main and auxiliary waveguides and first clad layer, wherein the first clad layer guides the light wave introduced into the first clad layer or the second clad layer and gradually converge the light wave towards the main waveguide.
Claims13
An optical coupling device comprises:
- a first clad layer having a first surface;
- a main waveguide having a strip form and including a linearly extending portion and a tapered portion, which is formed on the first surface to extend along a wave-guiding direction of a light wave, wherein the linearly extending portion has an emission port at one end of an emission side from which the light wave is emitted, and the tapered portion has one and other ends, the one end being connected to the other end of the linearly extending portion, the tapered portion has a first width which is gradually reduced towards the other end corresponding to an incident side of the light wave;
- a plurality of auxiliary waveguides which are formed on the first surface to extend along the wave-guiding direction of the light wave and are arranged in substantially parallel on the both sides of the main waveguide, wherein each of the auxiliary waveguides has first and second tapered portions which are coupled to each other at a coupling side, and the auxiliary waveguides have second widths which are gradually reduced towards the incident side of light wave and the emission side of light wave, from the coupling side, respectively;
- and
- a second clad layer which is so formed as to cover the main waveguide, auxiliary waveguides and first clad layer, wherein the first clad layer guides the light wave introduced into the first clad layer or the second clad layer and gradually converge the light wave towards the main waveguide.
2 more elements
An optical coupling-branching device comprising:
- a first clad layer having a first surface;
- a first waveguide extending on the first surface along a wave-guiding direction of a light wave from a light wave incident side towards a light wave emission side and including a first tapered portion that has a first head portion, the first waveguide having the first tapered portion whose lateral width is gradually reduced towards the emission side;
- second and third waveguides arranged in parallel, extending on the first surface along the wave-guiding direction of the light wave and including second and third tapered portions, the second and third tapered portions having second and third head portions, the second and third waveguides having the second and third tapered portions whose lateral widths are gradually reduced towards the incident side, and the second and third head portions being separately arranged with a distance and the first head portion being directed towards a portion between the second and third head portions;
- and
- a second clad layer which is so formed as to cover the first, second and third waveguides and the first surface, the second clad layer coupling the light wave wave-guided to the first waveguide from the incident side to the second and third waveguides to branch the same to the second and third waveguides.
2 more elements
An optical coupling-branching device comprising:
- a first clad layer having a first surface;
- a first waveguide extending on the first surface along a wave-guiding direction of a light wave guided from emission of the light wave towards an incident side of the light wave and including a first tapered portion that has a first head portion, the first waveguide including the first tapered portion whose lateral width is gradually reduced towards the incident side;
- second and third waveguides arranged in parallel, extending on the first surface along the wave-guiding direction of the light wave and including second and third tapered portions that have second and third head portions, the second and third waveguides including the second and third tapered portions whose lateral widths are gradually reduced towards the emission side and that have the second and third head portions separately arranged with a distance and the first head portion being directed towards a portion between the second and third head portions;
- and
- a second clad layer formed to cover the first, second and third waveguides and the first surface, the second clad layer coupling light waves wave-guided to the second and third waveguides from the incident side to the first waveguide to couple the same to the first waveguide.
2 more elements
Dependencies are inferred from the claim text.