Epitaxial Cladding Layer for Optoelectronic Light Confinement
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Solution Overview
Problem
Conventional optoelectronic devices operating at 1310 nm wavelengths face issues such as large footprint, high parasitic capacitance, polarization dependency, and limited operational bandwidth due to the necessity of a silicon seed layer and buried oxide layer, which complicates device fabrication and performance.
Innovation Solution
The optoelectronic device eliminates the buried oxide layer by using an epitaxial crystalline cladding layer with a lower refractive index than the optically active region, allowing for improved light confinement and reduced parasitic capacitance, thereby optimizing mode match and device yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a buried oxide layer and silicon seed layer are used in conventional optoelectronic devices, then light confinement is achieved, but device footprint increases and parasitic capacitance increases
Solution Approach 1:
The patent removes the buried oxide layer and reduces the silicon seed layer thickness to eliminate unnecessary components that increase device footprint and parasitic capacitance, while maintaining light confinement through optimized cladding layer design
2Reliability
If a buried oxide layer and thick silicon seed layer are used, then light confinement is improved, but manufacturing complexity and fabrication difficulty increase
Solution Approach 1:
The patent eliminates the buried oxide layer removal process and simplifies the seed layer structure, reducing the number of fabrication steps and improving manufacturing yield while maintaining effective light confinement
Solution Approach 2:
The patent optimizes the thickness parameters of the cladding layer and seed layer to achieve the necessary light confinement with simpler fabrication processes, changing the dimensional parameters to reduce complexity
3Reliability
If a thin silicon layer is used to maintain coupling efficiency, then coupling between waveguides is improved, but manufacturing precision requirements increase due to etching variability
Solution Approach 1:
The patent uses a thicker cladding layer that is eventually removed or serves as a sacrificial layer during fabrication, allowing for more tolerant etching processes while maintaining final coupling efficiency
Solution Approach 2:
The patent changes the thickness parameters of the cladding and active regions to provide a larger process window for etching, reducing the precision requirements while maintaining coupling efficiency
4Reliability
If conventional waveguide structures with buried oxide are used, then light guidance is achieved, but operational bandwidth is limited and polarization dependency increases
Solution Approach 1:
The patent uses composite cladding layer structures with different materials having different refractive indices to achieve superior light guidance properties that support broader bandwidth and reduced polarization dependency compared to conventional single-material structures
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
This solution results in lower coupling loss, higher device speed, and reduced sensitivity to manufacturing process variations, leading to improved performance and easier fabrication with better uniformity and higher yields.
Implementation Method 1
the epitaxial crystalline cladding layer has a refractive index which is less than a refractive index of the optically active region, such that optical power of the optoelectronic device is confined to the optically active region
Data Source
AI summary
An optoelectronic device and method of making the same. The device comprising: a substrate; an epitaxial crystalline cladding layer, on top of the substrate; and an optically active region, above the epitaxial crystalline cladding layer; wherein the epitaxial crystalline cladding layer has a refractive index which is less than a refractive index of the optically active region, such that the optical power of the optoelectronic device is confined to the optically active region.