Optical switching device and wavelength multiplexing device having planar waveguide-type structure
AssigneeElectronics and Telecommunications Research Institute
InventorsMyung Hyun Lee, Jung Jin Ju, Jung Yun Do, Seung Koo Park, Sun Tak Park
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Abstract
The present invention makes light input/output portions being a coupling portion with an optical fiber and a Y-branch using a rib waveguide, and a bending portion using a channel waveguide, wherein the rib waveguide and the channel waveguide is connected by a tapered waveguide. So that the present invention can improve the crosstalk, loss and operating voltage characteristics.
Claims5
A wavelength multiplexing device having planar waveguide-type structure comprising:
- light input/output portions connected to a plurality of optical fibers, respectively;
- and
- an arrayed waveguide grating having a difference of refractive indices to make bending,
- wherein the light input/output portions are fabricated by a rib waveguide;
- the arrayed waveguide grating is fabricated by a channel waveguide;
- and
- said rib waveguide and said channel waveguide are connected by a tapered waveguide.
An optical switching device having planar waveguide-type structure for switching lights transmitted through optical fibers comprising:
- a plurality of light input portions connected to a plurality of optical fibers, respectively;
- a first Y branch portion for distributing lights outputted from each of the plurality of light input portions, the first Y branch portion have a plurality of Y branches;
- thermo-electrodes formed respectively at outsides of the Y branch to change refractive indices of the Y branch;
- a bending portion for controlling a path of the light selectively outputted from the first Y branch portion according to a variation of the refractive indices;
- a second Y branch portion for transmitting lights outputted from the bending portion;
- and
- a plurality of light output portions connected to the second Y branch portion,
- wherein the light input and the light output portions, and the first and the second Y branches are composed of a rib waveguide, respectively;
- the bending portion is composed of a channel waveguide;
- and
- the first Y branch and the bending portion, and the bending portion and the second Y branch are connected by means of a tapered waveguide, respectively.
Dependencies are inferred from the claim text.