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US 8,798,407 B2Granted
Planar polarization rotator
AssigneeAlcatel Lucent
InventorLong Chen
Life of this patent
Estimating the term…
Abstract
An optical polarization rotator includes first and second optical waveguide ribs located along a planar surface of a substrate. The second optical waveguide rib is located farther from the surface than the first optical waveguide rib. First segments of the optical waveguide ribs form a vertical stack over the substrate, and second segments of the optical waveguide ribs are offset laterally in a direction along the planar surface. The first and second optical waveguide ribs are formed of materials with different bulk refractive indexes.
Claims10
A method, comprising:
- forming an optical layer over a first optical waveguide rib located along a planar surface of a substrate, the optical layer and first optical waveguide rib being formed of materials with different bulk refractive indexes;
- and
- etching the optical layer to form a second optical waveguide rib such that first segments of the optical waveguide ribs form a stack vertically oriented with respect to the planar surface and second segments of the optical waveguide ribs are relatively laterally offset along the planar surface;
- and
- wherein the method includes fabricating an optical polarization rotator including the optical waveguide ribs.
2 more elements
A method, comprising:
- forming an optical layer over a first optical waveguide rib located along a planar surface of a substrate, the optical layer and first optical waveguide rib being formed of materials with different bulk refractive indexes;
- and
- etching the optical layer to form a second optical waveguide rib such that first segments of the optical waveguide ribs form a stack vertically oriented with respect to the planar surface and second segments of the optical waveguide ribs are relatively laterally offset along the planar surface;
- and
- forming a spacer layer over the first optical waveguide rib prior to forming the optical layer, the spacer layer being formed of a material with a different bulk refractive index than the materials of the optical layer and the first optical waveguide layer.
2 more elements
A method, comprising:
- forming an optical layer over a first optical waveguide rib located along a planar surface of a substrate, the optical layer and first optical waveguide rib being formed of materials with different bulk refractive indexes;
- and
- etching the optical layer to form a second optical waveguide rib such that first segments of the optical waveguide ribs form a stack vertically oriented with respect to the planar surface and second segments of the optical waveguide ribs are relatively laterally offset along the planar surface;
- and
- wherein the first optical waveguide and a portion of the planar surface are formed of the same optical material.
2 more elements
A method, comprising:
- forming an optical layer over a first optical waveguide rib located along a planar surface of a substrate, the optical layer and first optical waveguide rib being formed of materials with different bulk refractive indexes;
- and
- etching the optical layer to form a second optical waveguide rib such that first segments of the optical waveguide ribs form a stack vertically oriented with respect to the planar surface and second segments of the optical waveguide ribs are relatively laterally offset along the planar surface;
- and
- wherein one of the optical layer and the first optical waveguide rib is formed of a semiconductor and the other of the optical layer and the first optical waveguide rib is formed of a dielectric.
2 more elements
Dependencies are inferred from the claim text.