Universal Waveguide Index Translator for Silicon Photonics
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Solution Overview
Problem
The mismatch in numerical aperture between optical silicon waveguides and single-mode optical fibers leads to significant light reflection and attenuation in silicon photonic devices, hindering efficient light coupling and signal transmission.
Innovation Solution
A translator waveguide with a wedge-shaped structure and a polymer material having adjustable numerical aperture values is used to bridge the mismatch between silicon waveguides and optical fibers, ensuring compatibility and minimizing coupling losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a direct coupling between optical silicon waveguides and single-mode optical fibers is used, then the device structure is simple, but significant light reflection and attenuation occur due to numerical aperture mismatch
Solution Approach 1:
The patent introduces a translator waveguide as an intermediary component between the silicon waveguide and optical fiber. This translator waveguide has a gradually varying cross-sectional area that transforms the numerical aperture mismatch into a gradual transition, enabling efficient light coupling while maintaining relatively simple device structure.
Solution Approach 2:
The translator waveguide employs continuous parameter changes in its cross-sectional area along the propagation direction. This gradual geometric transformation allows the numerical aperture to transition smoothly from the waveguide value to the fiber value, minimizing reflection and attenuation without requiring complex multi-component structures.
2Loss of energy
If a translator waveguide with gradual cross-sectional variation is used to match numerical aperture, then light coupling efficiency is improved, but the device complexity increases
Solution Approach 1:
The translator waveguide uses continuous parameter changes in cross-sectional area to achieve numerical aperture matching. This approach improves light coupling efficiency by transforming the abrupt interface into a gradual transition zone, while the single-component design keeps the overall device complexity manageable.
Solution Approach 2:
The translator waveguide is formed using composite material layers (such as silicon dioxide and silicon nitride) deposited on a silicon substrate. This composite structure enables precise control of optical properties while maintaining fabrication compatibility with standard semiconductor processes, balancing performance improvement with device complexity.
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 translator waveguide effectively reduces light reflection and attenuation by matching the numerical aperture values between silicon waveguides and optical fibers, enhancing signal transmission efficiency and bandwidth in silicon photonic devices.
Implementation Method 1
An optical waveguide is a physical structure that guides electromagnetic waves in the optical spectrum
Data Source
AI summary
An apparatus may be provided. The apparatus may comprise a first edge having a first area and a second edge having a second area larger than the first area. The apparatus may further comprise a volume of material disposed between the first edge and the second edge. The volume of material may have a first numeral aperture value at the first area and a second numeral aperture value at the second area. The second numeral aperture value may be less than the first numeral aperture value.