Bilayer Photonic Adiabatic Splitter for Low-Loss Coupling
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Solution Overview
Problem
Conventional adiabatic splitters face challenges in achieving minimal loss, compactness, and precise split ratios while maintaining fabrication tolerance and optical performance.
Innovation Solution
The adiabatic splitter design incorporates a first waveguide and a second waveguide with a stacked layer arrangement, allowing for a refractive index differential that prevents light scattering, enabling the waveguides to converge rapidly and facilitating a precise 50:50 split ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional adiabatic splitters are used, then basic splitting function is achieved, but optical loss is high and compactness is poor
Solution Approach 1:
The second waveguide is segmented into two distinct layers (first layer and second layer) with different refractive indices. This segmentation allows independent optimization of each layer's contribution to the adiabatic coupling process, enabling reduced optical loss while maintaining compact dimensions through selective engagement of layers during the coupling stage.
Solution Approach 2:
The waveguide structure employs composite material design by combining multiple layers with different refractive indices (first layer with lower refractive index, second layer with higher refractive index). This composite structure creates a differential refractive index profile that enhances adiabatic coupling efficiency, reducing optical loss without proportionally increasing device complexity.
2Volume of moving object
If waveguides converge rapidly to achieve compactness, then device size is reduced, but split ratio precision deteriorates
Solution Approach 1:
Different regions of the waveguide structure are assigned different refractive indices through the layered configuration. The first layer and second layer have distinct refractive indices that create localized optical field distributions. This local quality differentiation enables precise control of the coupling coefficient along the interaction length, maintaining split ratio precision (50:50) even as the overall device footprint is reduced through rapid convergence.
Solution Approach 2:
The patent utilizes parameter changes in the refractive index profile by introducing a second layer with a different refractive index than the first layer. This parameter variation allows tuning of the adiabatic coupling conditions, enabling precise split ratio control while accommodating compact waveguide geometries where the waveguides converge rapidly.
3Reliability
If stacked layer arrangement is used to prevent light scattering, then optical performance is improved, but fabrication complexity increases
Solution Approach 1:
The patent transitions from a single-layer waveguide structure to a multi-layer stacked arrangement by adding a vertical dimension to the waveguide composition. The first layer and second layer are positioned in stacked configuration, utilizing the vertical dimension to create refractive index differential that prevents light scattering. This dimensional addition improves optical performance while the layered architecture remains compatible with standard fabrication processes through planar processing techniques.
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 design achieves improved optical performance, packaging, and manufacturability by minimizing light loss, reducing material usage, and ensuring precise splitting ratios, making it suitable for advanced applications like Co-Packaged Optics.
Implementation Method 1
the first and second layers are in a stacked arrangement... allowing for a refractive index differential that prevents light scattering
Data Source
AI summary
Adiabatic splitters are disclosed. In one aspect, an adiabatic splitter includes a first waveguide and a second waveguide spaced from the first waveguide by a gap. The second waveguide has a first layer and a second layer. In a first stage of the adiabatic splitter, the first and second waveguides converge toward one another and the first and second layers are in a stacked arrangement. In a second stage of the adiabatic splitter, the second layer tapers and translates so that the first and second layers are no longer in the stacked arrangement at least at an output of the adiabatic splitter.