Crossover structure for optical waveguides
AssigneeCisco Technology, Inc.
InventorJean-Luc J. Tambasco
Life of this patent
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Abstract
The present disclosure describes a crossover structure for an optical circuit and a method of operating the optical circuit. The optical circuit includes a first layer, a second layer, a first waveguide positioned in the first layer, and a second waveguide positioned in the second layer. The second waveguide includes a first section, a second section, and a third section. When viewed along an axis normal to the first layer and the second layer, the first section is positioned on a first side of the first waveguide, the third section is positioned on a second side of the first waveguide, and the second section overlaps with the first waveguide. A first rate of change of a first angle between the second section and the first waveguide varies across a length of the second section.
Claims16
An optical circuit comprising:
- a first layer;
- a second layer;
- a first waveguide positioned in the first layer;
- and
- a second waveguide positioned in the second layer, wherein the second waveguide comprises a first section, a second section coupled to the first section at a first end of the second section, and a third section coupled to the second section at a second end of the second section, and wherein, when viewed along an axis normal to the first layer and the second layer:
- the first section is positioned on a first side of the first waveguide;
- the third section is positioned on a second side of the first waveguide opposite the first side;
- the second section overlaps with the first waveguide, wherein a first rate of change of a first angle between the second section and the first waveguide varies across a length of the second section;
- a second rate of change of a second angle between the first section and the first waveguide varies across a length of the first section moving towards the second section;
- and
- the second rate of change is greater than first rate of change.
A method comprising:
- communicating a first optical signal through a first waveguide positioned in a first layer of an optical circuit;
- communicating a second optical signal through a second waveguide positioned in a second layer of the optical circuit, wherein the second waveguide comprises a first section, a second section coupled to the first section at a first end of the second section, and a third section coupled to the second section at a second end of the second section, and wherein, when viewed along an axis normal to the first layer and the second layer:
- the first section is positioned on a first side of the first waveguide;
- the third section is positioned on a second side of the first waveguide opposite the first side;
- the second section overlaps with the first waveguide, wherein a first rate of change of a first angle between the second section and the first waveguide varies across a length of the second section;
- a second rate of change of a second angle between the first section and the first waveguide varies across a length of the first section moving towards the second section;
- and
- the second rate of change is greater than first rate of change.
An optical circuit comprising:
- a first waveguide;
- and
- a second waveguide positioned beneath the first waveguide, wherein the second waveguide comprises a first section, a second section coupled to the first section at a first end of the second section, and a third section coupled to the second section at a second end of the second section, and wherein:
- the first section is positioned on a first side of the first waveguide;
- the third section is positioned on a second side of the first waveguide opposite the first side;
- the second section overlaps with the first waveguide, wherein a first rate of change of a first angle between the second section and the first waveguide varies across a length of the second section;
- a second rate of change of a second angle between the first section and the first waveguide varies across a length of the first section moving towards the second section;
- and
- the second rate of change is greater than first rate of change.
Dependencies are inferred from the claim text.