SOI Power Splitter Perturbation Segments Back Reflection
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Solution Overview
Problem
Existing compact photonic devices for broadband power splitters face limitations in transmission efficiency and back reflection, with most achieving only 80% efficiency and significant back reflection due to fabrication challenges with sharp edges.
Innovation Solution
The development of ultra-compact SOI power splitters using machine-learning-assisted optimization techniques, incorporating nanostructured perturbation segments with refractive indices less than the guide material, achieves over 90% transmission efficiency and negligible reflection across a 100 nm bandwidth, enabling arbitrary power splitting ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If infinitly sharp Y splitter is used at the intersection of two outputs, then back reflection is reduced, but fabrication tolerance becomes extremely small resulting in large back reflection
Solution Approach 1:
The Y splitter is segmented into multiple sections with gradually changing angles rather than a single sharp intersection. This segmentation allows each section to have manufacturable angles while collectively achieving the function of reducing back reflection through gradual mode transformation.
Solution Approach 2:
Different sections of the Y splitter have different local geometries optimized for their specific function. The input section has a larger angle for mode coupling, while the output sections have smaller angles for reduced reflection, allowing each local region to perform its optimal function.
2Area of stationary object
If compact photonic devices are used for power splitting, then device footprint is reduced, but transmission efficiency is limited to approximately 80%
Solution Approach 1:
The device incorporates adjustable parameters such as waveguide widths, lengths, and separation distances that can be optimized to achieve both compact footprint and high transmission efficiency. The dynamic optimization allows the device to reach above 90% efficiency while maintaining compact dimensions.
Solution Approach 2:
By changing key geometric parameters of the waveguides and splitter structure, the device achieves improved transmission efficiency. Specific parameter optimizations include waveguide width ratios, separation distances, and splitter angles that simultaneously reduce device size and minimize losses.
3Area of stationary object
If nanostructured devices are used for power splitting, then device compactness is achieved, but back reflection remains non-negligible
Solution Approach 1:
The device incorporates preliminary mode matching sections and impedance transformation regions before the main splitting junction. These preliminary structures prepare the optical modes for efficient coupling and minimize reflections at the interfaces, achieving low back reflection in compact devices.
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 approach allows for efficient optical power splitting with minimal back reflection, achieving transmission efficiencies above 90% and reducing back reflection to below -20 dB, while maintaining a compact footprint, thus overcoming the limitations of previous devices.
Implementation Method 1
a power splitter including perturbation segments arranged in a first region and a second region of a guide material having a first refractive index, each segment having a second refractive index
Implementation Method 2
the first region is configured to split the input beam into a first beam and a second beam
Data Source
Figure 1
Figure 2A-1~2C
Figure 2D~2F
AI summary
A photonic device for splitting optical beams includes an input port configured to receive an input beam having an input power, a power splitter including perturbation segments arranged in a first region and a second region of a guide material having a first refractive index, each segment having a second refractive index, wherein the first region is configured to split the input beam into a first beam and a second beam, wherein and the second region is configured to separately guide the first and second beams, wherein the first refractive index is greater than the second refractive index, and output ports including first and second output ports connected the power splitter to respectively receive and transmit the first and second beams.