Two-Channel Photonic Demultiplexer With Inverse-Designed Dispersive Region
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Solution Overview
Problem
Conventional photonic devices for wavelength division multiplexing and demultiplexing are large in size and costly, and existing design techniques are limited by a small number of adjustable parameters, hindering performance and scalability.
Innovation Solution
Employing an inverse design process combining gradient-based optimization and first-principle simulations to generate photonic integrated circuits with a nearly unlimited number of design parameters, resulting in compact and efficient multi-channel demultiplexers and multiplexers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional splitters are used for wavelength demultiplexing, then the device can separate different wavelengths, but the device size becomes large with footprints in hundreds to thousands of square microns
Solution Approach 1:
The patent applies inverse design methodology where the desired output (wavelength separation) is specified first, and the design algorithm automatically determines the optimal input structure. This inverts the conventional design approach, enabling compact demultiplexers with footprints reduced from hundreds/thousands of microns to just 24.75 microns while maintaining wavelength separation capability
Solution Approach 2:
The patent utilizes adjustable geometric parameters in the demultiplexer design, including waveguide dimensions, coupling regions, and material compositions. By optimizing these parameters through inverse design, the device achieves both compact size and effective wavelength separation, resolving the contradiction between device area and functional performance
2Device complexity
If conventional design techniques are used, then the design process is straightforward, but the number of adjustable parameters is limited which hinders performance and scalability
Solution Approach 1:
The patent employs dynamic optimization algorithms that can adjust numerous design parameters simultaneously during the design process. This dynamic approach allows the system to explore a vast design space with many adjustable parameters, achieving superior device performance and scalability that static conventional design methods cannot attain
3Measurement precision
If existing demultiplexer designs are used, then the device can function, but crosstalk between channels remains high and manufacturability is reduced
Solution Approach 1:
The patent implements local optimization of the demultiplexer structure, including varying waveguide widths, heights, and material compositions at different locations within the device. This local quality approach enables precise control over light propagation and coupling, reducing crosstalk between channels while maintaining manufacturability through systematic design rules
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 achieves compact devices with improved performance, reduced crosstalk, and enhanced manufacturability, outstripping current state-of-the-art designs in size, robustness, and functionality.
Implementation Method 1
a dispersive region optically disposed between the input region and the plurality of output regions, the dispersive region structured to optically separate each of a plurality of distinct wavelength channels included in a multi-channel optical signal received at the input region and to guide each of the plurality of distinct wavelength channels to a corresponding one of the plurality of output ports
Data Source
Figure 1
Figure 2A~2C
Figure 3A~3D
AI summary
A two-channel photonic demultiplexer includes an input region to receive a multi-channel optical signal, two output regions, each adapted to receive a corresponding one of two distinct wavelength channels demultiplexed from the multi-channel optical signal, and a dispersive region including a first material and a second material inhomogeneously interspersed to form a plurality of interfaces that collectively structure the dispersive region to optically separate each of the two distinct wavelength channels from the multi-channel optical signal and respectively guide the first distinct wavelength channel to a first output region and the second distinct wavelength channel to the second output region when the input region receives the multi-channel optical signal. At least one of the first material or the second material is structured within the dispersive region to be schematically reproducible by a feature shape with a pre-determined width.