Optical Coupler Waveguide Segmentation for Mode Matching
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Solution Overview
Problem
The efficient edge coupling of optical fibers and integrated optical waveguides is hindered by the mismatch in modal sizes, leading to significant optical coupling loss, and existing designs require high fabrication accuracy with limited tolerance for dimensional variations.
Innovation Solution
An optical coupler system with multiple configurable parameters to maintain mode-matching conditions, accommodating dimensional variations and fabrication limitations, comprising semiconductor substrates, cladding layers, and optical waveguides with adjustable thickness and width to optimize coupling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If waveguide segments are laterally confined within multiple active optical device layers, then optical coupling efficiency is improved, but fabrication accuracy requirements increase significantly
Solution Approach 1:
The optical coupler is divided into multiple discrete layers (first cladding layer with first and second waveguides, second cladding layer with third waveguide) that can be independently fabricated and assembled. This segmentation allows each layer to be manufactured separately with standard tolerances, then combined to achieve the overall mode-matching function without requiring ultra-precise monolithic fabrication
Solution Approach 2:
The patent transitions from lateral confinement (2D planar geometry) to vertical stacking (3D layered geometry) by arranging waveguides in multiple cladding layers at different vertical positions. This dimensional change enables mode matching through vertical layering rather than requiring precise lateral dimensional control, thereby reducing fabrication accuracy requirements while maintaining coupling efficiency
2Loss of energy
If high degree of fabrication accuracy is used, then optical coupling efficiency is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent employs multiple configurable parameters (first transverse distance, first vertical distance, waveguide dimensions) that can be adjusted to accommodate standard fabrication tolerances. By providing design flexibility through these parameters, the system achieves optimal coupling efficiency without requiring tight fabrication controls, thereby simplifying manufacturing
Solution Approach 2:
The optical coupler design serves multiple functions: it provides mode matching between fiber and waveguide, accommodates fabrication variations, and maintains coupling efficiency across different operational conditions. This multi-functionality is achieved through the layered waveguide structure that inherently provides both optical functionality and tolerance to manufacturing variations
3Measurement precision
If multiple layers with precise dimensional control are implemented, then mode-matching is improved, but tolerance to dimensional variations decreases
Solution Approach 1:
By segmenting the optical coupler into multiple independently fabricable layers, the system achieves mode-matching precision through the collective arrangement of layers rather than relying on precise dimensions within a single layer. This segmentation provides inherent tolerance to variations in individual layer dimensions
Solution Approach 2:
The patent uses vertical layering (adding the third dimension) to achieve mode matching, replacing reliance on precise 2D lateral dimensions with control over vertical layer spacing and positioning. This dimensional transition provides greater tolerance to in-plane dimensional variations while maintaining optical coupling performance
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 system achieves high optical efficiency and tolerance to fabrication errors and dimensional variations, ensuring effective coupling between external light sources and integrated silicon photonics chips for both classical and quantum photonic applications.
Implementation Method 1
the first transverse distance and the first vertical distance are configured to perform one or more of mode matching with an external light source, maintaining optical coupling between the first, second, and third optical waveguides
Data Source
AI summary
There is described an optical coupler having a plurality of waveguides arranged in a plurality of cladding layers, each cladding layer having at least one waveguide. One or more of the vertical distances between waveguides in adjacent cladding layers and transverse distances between waveguides in the same cladding layer may be configured to perform one or more of mode matching with an external light source, maintaining optical coupling between the plurality of waveguides, and ensuring optical efficiency of the optical coupler.