Optical Waveguide Crossover Structure for Low-Crosstalk Routing
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Solution Overview
Problem
Existing optical circuits experience optical loss due to cross-talk between waveguides that cross over each other abruptly, leading to signal leakage.
Innovation Solution
A crossover structure for optical waveguides is designed where one waveguide slowly crosses over another across a portion of its length, with a varying angle, reducing abrupt transitions and minimizing overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If waveguides cross over each other abruptly in existing optical circuits, then the circuit structure is simple and compact, but optical loss occurs due to cross-talk and signal leakage
Solution Approach 1:
The second waveguide is divided into multiple sections (first section, second section, third section) with different orientations. The first section runs substantially parallel to the first waveguide, the second section crosses over at an angle, and the third section runs parallel again. This segmentation allows the waveguide to transition gradually rather than abruptly, reducing optical cross-talk while maintaining a compact structure.
Solution Approach 2:
The crossover structure uses curved or angled transitions instead of sharp corners. The second section of the waveguide introduces a gradual angular transition between the parallel sections, creating a smoother optical path that reduces signal leakage and cross-talk compared to abrupt directional changes.
2Reliability
If waveguides cross over each other with gradual overlap and varying angle, then optical crosstalk is reduced, but the crossover structure becomes more complex
Solution Approach 1:
The waveguides are positioned in different layers (first waveguide in first layer, second waveguide in second layer), utilizing the vertical dimension to achieve spatial separation. This layered approach allows the waveguides to cross over each other in the horizontal plane while maintaining vertical separation, reducing optical cross-talk without requiring complex three-dimensional routing.
Data Source
AI summary
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.