Optical Power Splitter Side-Confining Elements
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Solution Overview
Problem
Conventional optical power splitters have a large footprint and are intolerant to fabrication variations, leading to inefficiencies in photonics chips.
Innovation Solution
A structure for an optical power splitter is designed with a multimode interference region and side elements that are physically and optically coupled to the splitter body, featuring curved surfaces and bridges to enhance optical confinement and reduce fabrication sensitivity, allowing for a compact footprint and improved manufacturing tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If conventional optical power splitter structures are used, then the splitting function is achieved, but the footprint area is larger than desirable
Solution Approach 1:
The optical power splitter is divided into distinct functional segments: a compact multimode interference region for power splitting and separate side-confining elements for optical confinement. This segmentation allows each component to be optimized independently, reducing the overall footprint while maintaining performance and fabrication tolerance.
Solution Approach 2:
The patent transitions from planar confinement to three-dimensional confinement by adding side walls that extend vertically from the substrate. This dimensional change enables more effective optical confinement in a smaller footprint area, resolving the contradiction between compact size and fabrication tolerance.
2Manufacturing precision
If conventional optical power splitter structures are used, then the basic splitting function is provided, but fabrication variations significantly affect performance
Solution Approach 1:
The side-confining elements serve multiple functions simultaneously: they provide optical confinement, define the multimode interference region boundaries, and act as structural support. This multi-functionality improves manufacturing precision without proportionally increasing device complexity.
Solution Approach 2:
The patent modifies the confinement parameter by introducing side walls with specific height and width dimensions, creating a three-dimensional confinement structure. This parameter change makes the optical mode more robust against fabrication variations in the planar dimensions, thereby improving manufacturing precision.
3Area of moving object
If compact footprint is achieved, then area is reduced, but optical confinement and performance may deteriorate
Solution Approach 1:
The side-confining elements feature curved surfaces instead of sharp edges, creating smooth transitions for optical modes. This curvature reduces scattering and back reflection, maintaining low insertion loss while enabling compact footprint through efficient three-dimensional confinement.
Solution Approach 2:
The side-confining elements act as intermediary structures between the substrate and the optical mode, providing gradual confinement transitions. This intermediary approach minimizes abrupt changes that cause back reflection, thereby reducing energy loss while maintaining compact dimensions.
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 solution results in a compact, robust optical power splitter with reduced back reflection and insertion loss, improved manufacturing tolerance, and enhanced performance in broadband applications, making it suitable for integration into photonics chips.
Implementation Method 1
a splitter body defining a multimode interference region of the optical power splitter
Implementation Method 2
side-confining elements positioned adjacent to side surfaces of the splitter body
Data Source
AI summary
Structures for an optical power splitter and methods of forming a structure for an optical power splitter. A splitter body defines a multimode interference region of the optical power splitter. A first side element positioned adjacent to a first side surface of the splitter body, and a second side element positioned adjacent to a second side surface of the splitter body.