Micro-Ellipsoid Optical Coupling for Easier Fiber Alignment
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Solution Overview
Problem
Existing optical coupling systems for silicon photonics face challenges such as low coupling efficiency, excessive reflective losses, complex design, alignment difficulties, and time-consuming coupling processes, which hinder their adoption in high-performance applications.
Innovation Solution
A ball-lens optical coupling system utilizing optical total internal reflection, adjustable geometry, and micro-ellipsoid lenses to enhance coupling efficiency, reduce optical losses, and simplify alignment, featuring a detachable design for easy maintenance and customization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional electrical interconnects are used, then cost efficiency is maintained, but bandwidth and transmission distance are limited due to signal attenuation and electromagnetic interference
Solution Approach 1:
The patent replaces electrical interconnects with optical interconnects, substituting electrical signal transmission with optical signal transmission. This substitution eliminates electromagnetic interference and signal attenuation issues inherent in electrical systems, enabling higher bandwidth and longer transmission distances while maintaining cost efficiency through the use of VCSELs and silicon photonics integration
2Adaptability or versatility
If optical interconnects with VCSELs are used, then bandwidth and transmission distance are improved, but cost efficiency deteriorates compared to electrical interconnects
Solution Approach 1:
The patent merges photonic functions directly into silicon substrates, combining optical components (VCSELs, waveguides, modulators) with standard silicon manufacturing processes. This integration leverages the existing semiconductor fabrication infrastructure, significantly reducing the cost of optical interconnects while maintaining high bandwidth and transmission distance capabilities
3Loss of energy
If existing optical coupling systems are used, then optical signals can be transmitted, but coupling efficiency is low (45% to max 85%) due to mode size differences and alignment requirements
Solution Approach 1:
The patent introduces specially designed coupling structures as intermediaries between VCSELs and optical fibers. These coupling structures include mode-field adapters and alignment features that bridge the mode size mismatch between VCSELs and fibers, achieving near-unity coupling efficiency while simplifying the alignment process through self-aligning mechanisms
4Loss of energy
If existing optical coupling systems with multiple physical interfaces are used, then optical signals can be transmitted, but reflective losses increase and signal quality deteriorates due to optical polarization and optical noises
Solution Approach 1:
The patent eliminates unnecessary physical interfaces and reflective surfaces from the optical coupling path. By using direct coupling structures and avoiding multiple reflections, the system removes the sources of optical polarization changes and noise, thereby reducing reflective losses and improving signal quality and reliability
5Loss of energy
If complex optical coupling designs are used, then coupling can be achieved, but alignment time increases and technical requirements for production and maintenance are raised
Solution Approach 1:
The patent incorporates preliminary alignment features directly into the coupling structure design. Alignment marks, mechanical stops, and pre-positioned coupling elements are built into the structure during manufacturing, enabling rapid alignment and reducing the technical expertise required for installation and maintenance while maintaining high coupling efficiency
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 higher coupling efficiency, minimizes optical losses, and simplifies the alignment process, reducing operational complexity and costs while maintaining high performance.
Implementation Method 1
A ball-lens optical coupling system utilizing optical total internal reflection
Implementation Method 2
An optical coupling system with micro-ellipsoid lens that includes an array of the micro-ellipsoid lenses
Data Source
AI summary
A coupling system using micro-ellipsoid lens is disclosed. The system includes an array of the micro-ellipsoid lenses for coupling optical signals between silicon photonics devices and optical fibers. Preliminary micro-ellipsoid lenses are cut near the foci of the ellipsoid. The optical signals emanate from one focus and are reflected by the boundary of the ellipsoid. The reflective properties of the ellipsoid guarantees that the optical signals will pass through the other focus after the reflection. The optical signals are coupled to either the silicon photonics device or the optical fiber placed at the other focus.