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US 2002/0159706 A1Published application
Optical device
AssigneeNGK Insulators, Ltd.
InventorsOsamu Mitomi, Takenori Ichigi, Masatsugu Oshima, Jun Okamura, Masataka Yamashita
Life of this patent
Estimating the term…
Abstract
The spot size of light propagating through a cross waveguide 22 is larger than the spot size of light propagating through optical input waveguides 21a and 21b, optical output waveguides 23a and 23b, or connection waveguides 24a, 24b, 25a and 25b.
Claims22
An optical device comprising;
- an optical input waveguide,
- a branch/cross waveguide,
- an optical output waveguide, and
- connection waveguides for respectively connecting said optical input waveguide and said branch/cross waveguide and connecting said optical output waveguide and said branch/cross waveguide to each other,
- wherein the spot size of light propagating through said branch/cross waveguide is larger than the spot size of light propagating through said optical input waveguide, said optical output waveguide, or said connection waveguide.
2 more elements
An optical device comprising;
- an optical input waveguide,
- a branch/cross waveguide,
- an optical output waveguide, and
- connection waveguides for respectively connecting said optical input waveguide and said branch/cross waveguide and connecting said optical output waveguide and said branch/cross waveguide to each other,
- wherein;
- the spot size of light propagating through said branch/cross waveguide is not less than 5 μm.
3 more elements
An optical device comprising;
- an optical input waveguide,
- a branch/cross waveguide,
- an optical output waveguide, and
- connection waveguides for respectively connecting said optical input waveguide and said branch/cross waveguide and connecting said optical output waveguide and said branch/cross waveguide to each other,
- wherein at least one of the width and the thickness of said branch/cross waveguide is set at a value smaller than the width or the thickness of said optical input waveguide and said optical output waveguide.
2 more elements
An optical device comprising;
- an optical input waveguide,
- a branch/cross waveguide,
- an optical output waveguide, and
- connection waveguides for respectively connecting said optical input waveguide and said branch/cross waveguide and connecting said optical output waveguide and said branch/cross waveguide to each other,
- wherein the ratio of the width to the thickness of said branch/cross waveguide is not less than 10/4.
2 more elements
An optical device comprising;
- a core layer having a branch/cross waveguide,
- a first clad layer having a specific refractive index, with said core layer being deposited on a part of surface of said first clad layer,
- a second clad layer having a refractive index different from the refractive index of said first clad layer, with said core layer being provided between said first clad layer and said second clad layer, and
- at least one electrode for changing the refractive index of said branch/cross waveguide by applying a certain voltage or supplying a certain current.
1 more element
Dependencies are inferred from the claim text.