Stacked Polarization Splitter Layout for Compact Low-Loss Photonic Chips
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Solution Overview
Problem
Conventional polarization splitters in photonic chips have a large footprint and exhibit high loss, necessitating improved structures and methods for more efficient polarization splitting.
Innovation Solution
A polarization splitter structure comprising a multimode interference region with overlapping waveguide cores and stacked multimode interference regions, utilizing materials with varying refractive indices and angled connections to enhance polarization mode separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional polarization splitter structures are used, then polarization splitting function is achieved, but the footprint area is large
Solution Approach 1:
The patent transitions from a planar two-dimensional waveguide structure to a three-dimensional stacked structure with multiple interference regions at different vertical levels. The first and second multimode interference regions are positioned at different heights, creating a vertical stacking arrangement that reduces horizontal footprint while maintaining splitting functionality through three-dimensional optical path manipulation
Solution Approach 2:
The patent implements a nested configuration where the second multimode interference region is positioned to overlap with the first multimode interference region in the horizontal plane, while being separated vertically. This nesting approach allows compact spatial arrangement that minimizes the overall footprint area while preserving the necessary optical interference paths for polarization splitting
2Loss of energy
If conventional polarization splitter structures are used, then polarization splitting function is achieved, but the loss is high
Solution Approach 1:
The patent modifies the effective refractive index parameter by introducing a third material with a refractive index different from the first and second materials in the overlapping region. This parameter change creates a controlled index gradient that reduces optical loss through improved mode matching and reduced reflection at interfaces between regions with different refractive indices
Solution Approach 2:
The patent employs a composite material structure consisting of three distinct materials: a first material in the first multimode interference region, a second material in the second multimode interference region, and a third material in the overlapping region. This composite approach optimizes optical performance by selecting materials with specific refractive indices to minimize loss while maintaining polarization splitting functionality
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 structure achieves more efficient polarization splitting with reduced footprint by increasing the difference in effective refractive index between polarization modes, thereby improving performance and reducing size.
Implementation Method 1
a first multimode interference region, a second multimode interference region
Implementation Method 2
a first waveguide core adjoined to a first portion of the first multimode interference region at a first acute angle, a second waveguide core adjoined to a second portion of the first multimode interference region at a second acute angle
Data Source
Figure 1
Figure 2~2A
Figure 3
AI summary
Structures for a polarization splitter and methods of forming such structures. The structure comprises a multimode interference structure including a first multimode interference region, a second multimode interference region, a first waveguide core adjoined to a first portion of the first multimode interference region at a first acute angle, a second waveguide core adjoined to a second portion of the first multimode interference region at a second acute angle, and a third waveguide core adjoined to a third portion of the first multimode interference region. The second multimode interference region has an overlapping relationship with the first multimode interference region.