Vertically Stacked Grating Coupler Waveguide Integration
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Solution Overview
Problem
Conventional photonics chips do not effectively integrate optical components like grating couplers into the multilevel stack, limiting their layout efficiency and operational performance.
Innovation Solution
A structure and method for fabricating a photonics chip that includes a substrate with dielectric layers and waveguide cores in different levels, where a grating coupler with tapered segments is positioned adjacent to a waveguide core, promoting efficient optical signal transfer across levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical components are formed during middle-of-line and front-end-of-line processing, then optical components can be integrated into the chip, but the multilayer stack cannot effectively utilize these components and layout efficiency is limited
Solution Approach 1:
The patent transitions from planar integration to three-dimensional vertical integration by placing optical components in different elevation levels within the multilayer stack. Waveguide cores and grating couplers are positioned in separate layers (first level and second level respectively), enabling spatial separation and improved layout efficiency while maintaining functional integration.
Solution Approach 2:
The patent embeds optical components within the multilayer stack structure, nesting waveguide cores and grating couplers between dielectric layers. The waveguide core is positioned in the first level over the dielectric layer, while the grating coupler is positioned in the second level, creating a nested configuration that充分利用 the vertical space.
2Reliability
If grating couplers are positioned adjacent to waveguide cores in different levels, then interlayer transmission efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The grating coupler is divided into multiple segments positioned at different locations adjacent to the waveguide core. This segmentation allows for optimized coupling at multiple points along the waveguide, improving overall transmission efficiency while enabling modular manufacturing approaches.
Solution Approach 2:
The waveguide core is formed with a tapered section in advance during front-end-of-line processing, creating a pre-conditioned structure that facilitates subsequent grating coupler placement. The tapered geometry is prepared beforehand to optimize the coupling interface with the grating coupler segments.
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
This integration enables efficient interlayer transmission of optical signals, enhancing the performance and layout efficiency of photonics chips by overlapping the grating coupler segments with the tapered waveguide core sections.
Implementation Method 1
The segments of the grating coupler and the tapered section of the first waveguide core are positioned in an overlapping arrangement, enabling efficient interlayer transmission of optical signals
Data Source
AI summary
Structures including a grating coupler and methods of fabricating a structure including a grating coupler. The structure includes structure includes a dielectric layer on a substrate, a first waveguide core positioned in a first level over the dielectric layer, and a second waveguide core positioned in a second level over the dielectric layer. The second level differs in elevation above the dielectric layer from the first level. The first waveguide core includes a tapered section. The structure further includes a grating coupler having a plurality of segments positioned in the second level adjacent to the second waveguide core. The segments of the grating coupler and the tapered section of the first waveguide core are positioned in an overlapping arrangement.