Multi-thickness Waveguide Core for Edge Coupler Mode Confinement
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Solution Overview
Problem
Current photonics structures for waveguides and edge couplers face challenges in fully confining the incident mode due to the small cross-sectional area at the tip of the inverse taper, leading to inefficient mode transformation and electromagnetic field distribution.
Innovation Solution
A photonics structure with a waveguide core comprising sections of different thicknesses and vertically projecting segments, where the segments' depth and height are strategically varied to form a metamaterial structure that enhances mode confinement and conversion, reducing birefringence and differential group delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the cross-sectional area of the inverse taper tip is reduced to enable mode transformation, then mode conversion capability is improved, but electromagnetic field confinement deteriorates
Solution Approach 1:
The waveguide core is divided into multiple sections with different thicknesses along the propagation direction. This segmentation allows different portions of the waveguide to perform different functions: thinner sections enable mode transformation while thicker sections provide better field confinement, resolving the contradiction between mode conversion capability and electromagnetic field confinement.
Solution Approach 2:
Different sections of the waveguide core are assigned different local properties (thickness values) optimized for specific functions. The varying thickness profile creates local regions with enhanced confinement properties where needed, while maintaining the inverse taper geometry for mode transformation in other regions.
2Object-generated harmful factors
If the inverse taper width is increased to confine electromagnetic field, then field confinement is improved, but mode transformation efficiency deteriorates
Solution Approach 1:
The waveguide core implements a dynamic thickness profile that varies along the propagation direction. This dynamic structure allows the confinement properties to change progressively, enabling efficient mode transformation in regions where the thickness is optimized for coupling while maintaining good field confinement in regions where the thickness is increased.
3Ease of manufacture
If uniform thickness waveguide core is used to simplify fabrication, then manufacturing complexity is reduced, but mode conversion control deteriorates
Solution Approach 1:
The invention changes the thickness parameter of the waveguide core along its length, creating a non-uniform structure. This parameter variation enables precise control over mode properties and conversion efficiency, overcoming the limitations of uniform thickness designs while remaining compatible with standard semiconductor fabrication processes.
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
The modified waveguide core design improves mode conversion efficiency, reduces birefringence, and allows for more controlled mode properties, enabling better light propagation and integration into photonic integrated circuits or chips with reduced operational overhead.
Implementation Method 1
The waveguide core may be aligned along a longitudinal axis 11. The section 18 and the section 24 of the waveguide core 10 may have a thickness T1, the section 20 of the waveguide core 10 may have a thickness T2, and the section 22 of the waveguide core 10 may have a thickness T3.
Implementation Method 2
The gradually-varying cross-sectional area of the inverse taper supports mode transformation and mode size variation associated with mode conversion when light is transferred from the light source to the edge coupler.
Data Source
AI summary
Photonics structures for a waveguide or an edge coupler and methods of fabricating a photonics structure for a waveguide or an edge coupler. The photonics structure includes a waveguide core having a first section, a second section longitudinally adjacent to the first section, first segments projecting in a vertical direction from the first section, and second segments projecting in the vertical direction from the second section. The first section of the waveguide core has a first thickness, and the second section of the waveguide core has a second thickness that is greater than the first thickness.