Reconfigurable Optical Circuit Beamsplitter Imperfection Mitigation
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Solution Overview
Problem
Scaling up linear optics to a large number of optical modes increases the likelihood of imperfections such as lossy modes and compromised parameter ranges in optical circuits, leading to significant costs and increased footprint when addressing these issues with existing methods.
Innovation Solution
Reconfiguring optical circuits by setting beamsplitters into transmissive or reflective states to circumvent imperfections, allowing the use of affected components in a compatible manner, thereby reducing the number of modes processed and maintaining circuit functionality without discarding the entire circuit or increasing its footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple copies of optical circuits are fabricated for quality inspection, then reliability is improved, but manufacturing cost increases significantly
Solution Approach 1:
The patent applies preliminary action by performing quality inspection and characterization of optical components during the fabrication process itself, rather than requiring separate post-fabrication testing of multiple copies. This allows defects to be identified and accounted for early, enabling the use of a single fabricated circuit with corrected parameters rather than requiring multiple copies.
Solution Approach 2:
The patent employs parameter changes by measuring actual optical parameters of components (such as beam splitter ratios and phase shifter values) and then adjusting the circuit configuration or operational parameters to compensate for deviations from ideal values. This transforms the approach from selecting perfect components to using imperfect components with adjusted parameters.
2Adaptability or versatility
If nonlinear optimization is used to address compromised parameter ranges, then adaptability is improved, but solution existence is not guaranteed
Solution Approach 1:
The patent implements feedback by measuring the actual optical parameters of components and using this information to adjust the circuit configuration. The system continuously monitors performance and modifies operational parameters to maintain desired functionality, ensuring a solution exists by adapting to the actual component characteristics rather than relying on theoretical optimization.
Solution Approach 2:
The optical circuit performs self-service by automatically adjusting its own configuration based on measured component parameters. The system characterizes its own components and reconfigures itself to compensate for imperfections, eliminating the need for external nonlinear optimization algorithms that may not find solutions.
3Adaptability or versatility
If self-reconfiguring optics is used to address imperfections, then adaptability is improved, but device footprint increases by at least a factor of two
Solution Approach 1:
The patent applies dynamics by making the optical circuit reconfigurable through programmable components such as phase shifters and variable beam splitters. These components can dynamically adjust their properties to compensate for imperfections without requiring additional physical space for separate correction circuits, maintaining a compact footprint while achieving adaptability.
Solution Approach 2:
The patent implements universality by designing optical components that serve multiple functions: they perform their primary optical function while also enabling reconfiguration to compensate for imperfections. The same beamsplitters and phase shifters used for normal circuit operation are also used for error correction, eliminating the need for dedicated correction components that would increase footprint.
4Productivity
If optical circuits are scaled up to large number of modes, then productivity is improved, but probability of imperfections increases
Solution Approach 1:
The patent applies preliminary action by characterizing and measuring the actual parameters of all optical components during fabrication, before the circuit is deployed for processing. This early characterization allows the system to account for imperfections in large-scale circuits, enabling high productivity while maintaining reliability through proactive defect identification and compensation.
Solution Approach 2:
The patent employs parameter changes by adjusting the operational parameters of the optical circuit based on measured component characteristics. In large-scale circuits with many components, this parameter adjustment approach allows the system to compensate for accumulated imperfections across numerous components, maintaining processing accuracy despite the high probability of defects in scaled-up systems.
Data Source
AI summary
A method includes configuring a first plurality of beamsplitters in a network of interconnected beamsplitters of an optical circuit into a transmissive state. The optical circuit is configured to perform a linear transformation of N input optical modes, where N is a positive integer. The first plurality of beamsplitters is located along a beam path within the optical circuit and traversing a target location. The method also includes configuring a second plurality of beamsplitters in the network of interconnected beamsplitters of the optical circuit into a reflective state to reconfigure the optical circuit into a reconfigured optical circuit. The reconfigured optical circuit is configured to perform a linear transformation on M input optical modes, where M is a positive integer less than N. The second plurality of beamsplitters is located along at least one edge of the optical circuit.