Parameterized Grating Coupler Layout for Efficient Optical Coupling
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Solution Overview
Problem
Current methods for generating layout geometries of optical elements in silicon photonically-enabled integrated circuits fail to optimize for various design characterizations and do not provide parameterized optical element layouts that can be defined using scripting languages like SKILL, Ample, STP, or Python, limiting the efficiency and flexibility of optical signal coupling.
Innovation Solution
A scalable system and method for automated, parameterized optical element generation, specifically for grating couplers, using parameterized curved patterns optimized based on desired design characteristics, enabling efficient optical signal coupling into and out of integrated optical chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current methods are used to generate layout geometries of optical elements, then the design process is simplified, but the coupling efficiency and optimization for various design characterizations are insufficient
Solution Approach 1:
The patent applies parameter changes by systematically varying geometric parameters (curvature radius, width, length, spacing) of grating coupler elements to optimize coupling efficiency. Multiple sets of parameters are tested and selected based on performance metrics, directly addressing the need for optimized layout geometries while maintaining a structured design process.
Solution Approach 2:
The patent implements preliminary action through pre-defined design rules and constraints that guide the layout generation process. By establishing optimization criteria and parameter ranges beforehand, the system automates the generation of optimized geometries, reducing the need for manual iteration while improving coupling efficiency.
2Productivity
If manual design methods are used for optical element layouts, then flexibility in design customization is maintained, but the physical layout time and design iterations are extended
Solution Approach 1:
The patent uses copying by replicating standardized grating coupler unit cells across the device layout. Once a optimized unit cell is designed, it can be copied and instantiated multiple times with different parameter sets, significantly accelerating the layout generation process while maintaining design consistency and quality.
Solution Approach 2:
The patent applies segmentation by dividing the grating coupler structure into discrete unit cells with specific geometric parameters. This segmentation allows independent optimization of each unit and enables modular design, where optimized segments can be reused and reconfigured, reducing overall design iteration time.
3Adaptability or versatility
If fixed geometry designs are used for grating couplers, then manufacturing is simplified, but the adaptability to different design characterizations and optimization criteria is limited
Solution Approach 1:
The patent implements dynamics by making the grating coupler geometries adjustable and configurable through parameterization. Different design scenarios can be addressed by modifying geometric parameters (curvature, width, spacing) without changing the fundamental structure, enabling adaptability to various optimization criteria while maintaining manufacturability through standardized fabrication processes.
Data Source
AI summary
A method embodiment includes generating a physical layout for a grating coupler integrated in a photonically-enabled circuit. The method includes receiving a photonically-enabled integrated circuit design; receiving a parameterized wavelength of an optical beam, a parameterized first refractive index of the grating coupler, and a parameterized second refractive index of a cladding layer; receiving a parameterized curvature of curved elongate scattering elements, where the grating coupler includes a plurality of the curved elongate scattering elements; generating a physical layout for the grating coupler based at least on the received parameterized wavelength, the parameterized first refractive index, the parameterized second refractive index, and the parameterized taper length parameterized curvature of the curved elongate scattering elements; and outputting the physical layout of the grating coupler for manufacturing under a semiconductor fabrication process.