Epitaxial Cladding Layer for 1310 nm Optoelectronic Devices
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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 manufacturing and affects performance.
Innovation Solution
The use of an epitaxial crystalline cladding layer with a lower refractive index than the optically active region, replacing the traditional buried oxide layer, to confine optical power and reduce coupling loss, 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, parasitic capacitance increases, and manufacturing complexity increases
Solution Approach 1:
The patent removes the buried oxide layer and silicon seed layer from the conventional device structure. By extracting these unnecessary layers, the invention achieves simpler manufacturing processes while maintaining effective light confinement through the optimized waveguide structure and cladding layers alone.
Solution Approach 2:
The patent employs composite material structures in the waveguide and cladding layers to achieve superior light confinement properties. By using carefully selected material compositions and refractive index profiles, the device maintains effective optical confinement without requiring the traditional buried oxide layer, thereby reducing manufacturing complexity.
2Reliability
If a silicon seed layer is used for epitaxial growth, then crystal structure quality is improved, but coupling efficiency between passive and active waveguides decreases
Solution Approach 1:
The patent applies local quality by providing crystal structure support only where needed - through the substrate and selective cladding layers - rather than requiring a continuous silicon seed layer. This localized approach maintains crystal quality in the active region while preserving coupling efficiency between waveguides.
Solution Approach 2:
The patent transitions from a two-dimensional silicon seed layer approach to a three-dimensional structured waveguide design with optimized cladding layers. By using vertical layering and refractive index profiling in the third dimension, the invention achieves crystal structure quality without the horizontal extension of seed layers that degrades coupling.
3Loss of energy
If the silicon layer thickness is reduced to maintain coupling efficiency, then coupling efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the key parameters of the waveguide structure - using optimized cladding layer thicknesses and refractive index profiles - to achieve good coupling efficiency without requiring extremely thin silicon layers. This parameter optimization reduces the stringency of thickness control requirements while maintaining performance.
Solution Approach 2:
The patent employs dynamic optimization of the waveguide structure parameters during the design phase, allowing the system to adapt to manufacturing tolerances. By designing a structure that is less sensitive to thickness variations, the invention achieves robust coupling efficiency without demanding ultra-precise thickness control.
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 device losses, higher yield in fabrication, reduced RF parasitic capacitance, and improved device speed, making the optoelectronic devices less polarization dependent and less sensitive to manufacturing process variations.
Implementation Method 1
Waveguides built upon this base comprise three layers: a core layer, a bottom cladding layer, and an upper cladding layer; which are configured to guide a light signal through the core layer by total internal reflection
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.