Isolated Waveguide Absorbers for Optical Leakage Reduction
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Solution Overview
Problem
Semiconductor optical waveguide structures face issues with leakage and crosstalk due to open or unconnected ports, leading to backscatter and interference, which existing absorbers fail to adequately address.
Innovation Solution
The implementation of multi-mode optical waveguide structures with isolated absorbers, comprising semiconductor materials like Ge on Si, utilizing tapered segments and evanescent coupling to attenuate optical modes, thereby reducing back reflection and maintaining a compact footprint without additional fabrication steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If open or unconnected ports are used in photonic devices, then device complexity is reduced and ease of manufacture is improved, but optical signal leakage and crosstalk increase
Solution Approach 1:
The patent extracts the harmful optical signal leakage by introducing isolated absorber structures that are spatially separated from the main waveguide path. These absorbers are positioned in isolated regions to specifically capture and dissipate leaked optical energy without interfering with the primary signal transmission, thus eliminating the harmful effect while maintaining the simplicity of open ports.
Solution Approach 2:
The patent introduces absorber structures as intermediary elements between the open ports and the optical signal path. These absorbers act as mediators that intercept and convert leaked optical energy into heat, preventing it from causing crosstalk or interference with other photonic devices while allowing the ports to remain open and simple to manufacture.
2Object-generated harmful factors
If absorbers are coupled to open ports to prevent leakage, then optical signal interference is reduced, but device complexity increases
Solution Approach 1:
The patent segments the absorber structures into isolated, discrete units that are positioned at specific locations away from the main waveguide. This segmentation allows each absorber to independently handle leakage from specific ports without requiring a complex integrated solution, thereby reducing overall device complexity while effectively preventing optical signal interference.
Solution Approach 2:
The patent moves the absorber structures to a different spatial dimension by positioning them in isolated regions separated from the main waveguide path. This dimensional separation allows the absorbers to perform their function of preventing optical interference without adding complexity to the primary waveguide structure, as they operate in a distinct spatial zone.
3Object-generated harmful factors
If traditional absorbers are used to attenuate optical signals, then back reflection is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary action by designing absorber structures with predetermined geometric configurations and material properties that inherently provide effective optical attenuation. The absorbers are pre-configured with specific dimensions and positions that optimize their ability to reduce back reflection, allowing them to function effectively without requiring high manufacturing precision during the fabrication process.
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
Effectively attenuates both fundamental and higher-order optical modes, reducing back reflection and crosstalk while maintaining a compact design, leveraging evanescent coupling between Si and Ge modes for passive attenuation.
Implementation Method 1
leveraging evanescent coupling between Si photonic modes and Ge-on-Si modes to reduce back reflection
Data Source
AI summary
The present disclosure relates to semiconductor structures and, more particularly, to multi-mode optical waveguide structures with isolated absorbers and methods of manufacture. The structure includes: a waveguide structure including tapered segments; and at least one isolated waveguide absorber adjacent to the waveguide structure along its length.