Edge Coupler Structure With Lateral Features for Mode Matching
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Solution Overview
Problem
Existing photonics chips face challenges in efficiently coupling light from a light source to a photonic integrated circuit using edge couplers, particularly in terms of mode transformation and mode size variation, leading to inefficiencies and polarization group delay.
Innovation Solution
The introduction of coupling-assistance features adjacent to the edge coupler, which are positioned laterally and embedded in a dielectric layer, to enhance mode transformation, control mode size, and reduce polarization group delay during light transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an edge coupler with inverse taper is used to transfer light from the light source to the photonic integrated circuit, then mode transformation and mode size variation are supported, but coupling efficiency is insufficient and polarization group delay occurs
Solution Approach 1:
The patent introduces coupling-assistance features as intermediary structures positioned between the edge coupler and the photonic integrated circuit. These features act as mediators to facilitate more effective mode transformation and coupling, thereby improving coupling efficiency and reducing light loss without requiring fundamental changes to the edge coupler structure itself.
Solution Approach 2:
The patent modifies the structural parameters of the edge coupler system by adding coupling-assistance features with specific geometries and positions. These parameter changes enable better mode matching and reduce polarization group delay, directly addressing the insufficiency of coupling efficiency in conventional edge coupler designs.
2Reliability
If conventional edge coupler structure is used, then device complexity is low, but mode transformation and polarization control are insufficient
Solution Approach 1:
The patent segments the edge coupler structure into distinct functional portions: the inverse taper section and the coupling-assistance features. This segmentation allows each portion to perform its specific function optimally - the inverse taper for mode size variation and the coupling-assistance features for enhanced mode transformation and polarization control - thereby improving performance without creating a monolithic complex structure.
Solution Approach 2:
The patent applies local quality by providing coupling-assistance features at specific locations adjacent to the edge coupler where they are most needed for enhancing mode transformation and polarization control. This localized approach improves polarization control in critical areas without unnecessarily complicating the entire device structure.
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
Improves coupling efficiency, reduces light loss, and optimizes mode shape and polarization control, resulting in enhanced performance of photonics chips.
Implementation Method 1
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
Implementation Method 2
The introduction of coupling-assistance features adjacent to the edge coupler, which are positioned laterally and embedded in a dielectric layer, to enhance mode transformation, control mode size, and reduce polarization group delay during light transfer
Implementation Method 3
The edge coupler is configured to transfer light of a given mode from the light source to the photonic integrated circuit on the photonics chip
Data Source
AI summary
Structures including an edge coupler and methods of forming such structures. The structure comprises an edge coupler including a first portion and a second portion between the first portion and a semiconductor substrate, a first coupling-assistance feature adjacent to the first portion of the edge coupler, and a second coupling-assistance feature adjacent to the first portion of the edge coupler. The first portion of the edge coupler is positioned in a lateral direction between the first coupling-assistance feature and the second coupling-assistance feature.