Tunable Beam Splitter Layout for Low-Loss Electro-Optic Modulation
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Solution Overview
Problem
Existing optical beam splitters face challenges in achieving efficient modulation and scaling due to limitations in design and materials, leading to increased scattering losses and reduced electro-optical tuning ranges.
Innovation Solution
A tunable beam splitter design utilizing a common polysilicon ground with extended active regions and optimized dopant concentrations, allowing for increased contact scalability and reduced scattering losses, while enhancing electro-optical tuning capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional optical beam splitter designs are used, then device structure is simpler, but scattering losses increase and electro-optical tuning ranges are reduced
Solution Approach 1:
The patent implements a tunable beam splitter where the beam splitting ratio can be dynamically adjusted through electro-optical modulation. The design incorporates modulating regions with doped semiconductor layers that allow dynamic control of light distribution between output waveguides, transforming a static beam splitter into a dynamic, reconfigurable device that reduces scattering losses while maintaining structural integrity.
Solution Approach 2:
The patent changes material parameters by introducing doped semiconductor layers (n-type and p-type regions) within the beam splitter structure. By varying dopant concentrations and creating graded index regions, the optical properties of the beam splitter are modified to reduce scattering losses and enable electro-optical tuning, achieving better performance without excessive structural complexity.
2Power
If conventional beam splitter designs are used, then manufacturing process is simpler, but modulation efficiency is reduced
Solution Approach 1:
The patent segments the beam splitter structure into distinct functional regions: input waveguide, modulating regions with n-type and p-type doped layers, and output waveguides. This segmentation allows independent optimization of each region for modulation efficiency while maintaining compatibility with standard semiconductor manufacturing processes through sequential layer deposition and doping steps.
Solution Approach 2:
The patent employs composite material structures by combining doped semiconductor layers with undoped regions, creating n-type and p-type composite regions within the beam splitter. These composite structures enhance modulation efficiency through electro-optical effects while remaining manufacturable using existing semiconductor fabrication techniques for doping and layer deposition.
3Adaptability or versatility
If beam splitters without extended active regions are used, then device area is smaller, but electro-optical tuning range is reduced
Solution Approach 1:
The patent extends the active regions of the beam splitter in the vertical dimension by incorporating multiple doped layers (n-type and p-type) stacked within the waveguide structure. This vertical dimensionality allows enhanced electro-optical tuning range through increased interaction length with the modulating fields, achieving broader tuning capabilities without proportionally increasing the lateral device footprint.
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 design achieves improved modulation efficiency, extended electro-optical tuning ranges, and better design flexibility by minimizing polysilicon-induced scattering losses and enabling a smaller unit cell structure.
Implementation Method 1
a first doped waveguide region and a second doped waveguide region formed in the optical confinement layer... a first polysilicon material overlying both the first waveguide and the second waveguide... having a constant concentration of a first dopant
Data Source
AI summary
An optical device and methods of manufacturing such optical devices are presented. In embodiments the optical device is a tunable beam splitter which is made by forming a first dopant region over a substrate, the first dopant region comprising a first waveguide and a second waveguide, depositing a cladding material over the first waveguide and the second waveguide, and forming a second dopant region overlying the first waveguide and the second waveguide, wherein the forming the second dopant region comprises forming a first region extending over both the first waveguide and the second waveguide, the first region having a constant concentration of a first dopant.