Balanced Optical Waveguide Bus Layout Generation
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Solution Overview
Problem
Existing methods for designing silicon photonic integrated circuits (PICs) with optical waveguide buses require manual adjustments to balance waveguide paths, which are time-consuming, prone to errors, and inconsistent, as they aim to equalize transmission loss and phase shifting by modifying path lengths and bend numbers.
Innovation Solution
A design system and method that automatically generates balanced optical waveguide paths within a waveguide bus by inserting additional linear segments and bends, using a processor to route paths between input/output nodes while maintaining defined boundaries, ensuring minimal differences in length and bend count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual adjustments are made to balance waveguide paths, then transmission loss and phase shifting are equalized, but the design process becomes time-consuming and error-prone
Solution Approach 1:
The system performs automatic waveguide path balancing without requiring manual intervention. The processor automatically calculates and adjusts path lengths and bend configurations to equalize transmission loss and phase shifting across all waveguides in the bus, making the system self-sufficient and eliminating time-consuming manual operations
Solution Approach 2:
The patent replaces manual mechanical adjustment operations with an automated computational system. The processor uses algorithms to calculate optimal path configurations and generates layout data automatically, substituting human operators with electronic computation to achieve faster and more consistent results
2Manufacturing precision
If manual adjustments are made to balance waveguide paths, then path lengths and bend numbers are equalized, but consistency and reliability of the design are reduced
Solution Approach 1:
The system automatically ensures consistent application of balancing criteria across all waveguide paths. The processor uniformly applies the same algorithms and constraints to each path, eliminating variability introduced by different operators or manual processes, thereby enhancing design reliability and repeatability
Solution Approach 2:
The system incorporates iterative feedback mechanisms where the processor calculates path parameters, evaluates balancing criteria, and automatically adjusts configurations until optimal equality is achieved. This closed-loop approach ensures consistent and reliable results by continuously monitoring and correcting path configurations based on predefined performance targets
3Area of stationary object
If automatic layout generation is used to minimize path length and bends, then area consumption is reduced, but waveguide paths become unbalanced with unequal transmission loss
Solution Approach 1:
The system segments the waveguide path design into two distinct phases: first, automatic routing to minimize area consumption by finding shortest paths with fewest bends; second, balancing adjustments that modify specific path segments to equalize transmission characteristics. This segmentation allows both area efficiency and path balancing to be optimized in sequence without compromise
Solution Approach 2:
The system applies local quality adjustments to specific waveguide paths that require balancing. Rather than redesigning entire paths, the processor identifies and modifies only the necessary segments of individual paths to achieve equal transmission loss and phase shifting, preserving the overall area-optimized layout while correcting local imbalances
Data Source
AI summary
Disclosed are a system, method, software tool, etc. for generating a layout indicating the paths for balanced optical waveguides (WGs) of a WG bus. A grid is used to route paths, which extend between corresponding first and second input/output nodes, respectively, and which are within boundaries of a defined area. The paths are automatically rerouted to balance for length and number of bends without overly increasing the lengths of or number of bends in those paths and further without moving the input/output nodes or falling outside the established boundaries. Automatic rerouting of the paths is performed iteratively based on results of various intersection operations related to different path-specific sets of points on the grid to determine when and where to insert additional linear segments and bends into the paths. Then, a layout indicating the balanced paths is generated. Also disclosed is a WG bus structure with balanced optical WGs.