Bypass Waveguide Layout for Low-Loss Inter-Level Optical Coupling
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Solution Overview
Problem
Optical transmission losses occur at waveguide intersection regions due to reflection and scattering, limiting the optical transmission efficiency and performance of optical modules with coplanar waveguides.
Innovation Solution
Incorporation of a bypass waveguide that is laterally offset and vertically separated from transverse waveguides, allowing optical signals to travel in different directions while mitigating reflection and scattering losses through a vertically spaced optical coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coplanar waveguides are used to guide light along individual levels of the IC, then light guidance along a single level is achieved, but optical transmission losses occur at waveguide intersection regions due to reflection and scattering
Solution Approach 1:
The patent introduces a third dimension (vertical separation) to the waveguide arrangement. The bypass waveguide is positioned above the transverse waveguide in different vertical levels, allowing optical signals to travel from one level to another through vertical coupling regions without experiencing the reflection and scattering losses that occur at coplanar intersections. This dimensional transition eliminates the harmful interactions between waveguides extending in different directions.
2Adaptability or versatility
If waveguides extend in different directions at the same level, then comprehensive optical routing is achieved, but reflection and scattering losses occur at intersection regions
Solution Approach 1:
The patent resolves the routing versatility problem by moving to a multi-level architecture. The bypass waveguide extends in the first direction at a higher vertical level than the transverse waveguide, enabling signals to route between different directions without coplanar intersections. This vertical stacking approach maintains routing flexibility while eliminating the reflection and scattering losses inherent in coplanar cross-directional waveguide intersections.
3Ease of manufacture
If coplanar waveguide structure is used, then manufacturing simplicity is maintained, but optical transmission efficiency is limited due to intersection losses
Solution Approach 1:
The patent extends the coplanar fabrication approach to multiple vertical levels. The bypass waveguide and transverse waveguide are formed in different vertical layers, allowing standard planar fabrication processes to be applied at each level while achieving three-dimensional routing. This maintains manufacturing simplicity through layer-by-layer processing while dramatically improving optical transmission efficiency by eliminating coplanar intersection losses through vertical separation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances optical transmission efficiency and overall performance by reducing optical losses between waveguides extending in different directions, facilitating inter-level optical interconnection.
Implementation Method 1
a bypass waveguide configured to facilitate inter-level optical coupling... a bypass waveguide laterally extending in the first direction and vertically spaced from the transverse waveguide... a bypass coupler structure directly overlying and optically coupled to the waveguide coupler structure
Data Source
AI summary
Various embodiments of the present disclosure are directed towards a semiconductor device including a first optical interconnect extending in a first direction. The first optical interconnect includes a first body segment, a first tip segment, and a first tapered segment between the first body segment and the first tip segment. A dielectric layer overlies the first optical interconnect. A second optical interconnect overlies the dielectric layer and extends in the first direction. The second optical interconnect includes a second body segment, a second tip segment, and a second tapered segment between the second body segment and the second tip segment. The second tip segment overlies at least one of the first tip segment and the first tapered segment.