Electrical Analog Memory for Photonic Circuits
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Solution Overview
Problem
Photonic hardware faces latency issues due to data conversion between analog optical and digital formats, and optical memory devices suffer from reliability problems and high write time latency.
Innovation Solution
An integrated circuit with a photonic processor and an electrical analog memory, where the photonic processor is directly coupled to an array of photonic intensity modulators and photodetectors, allowing for efficient conversion and storage of data without the need for digital memory, thereby reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If digital memory is used to hold data during photonic computing, then data storage is achieved, but additional latency is introduced due to data conversion from analog optical to digital format and vice versa
Solution Approach 1:
The patent extracts and eliminates the digital memory component from the photonic computing system. By removing the digital memory and its associated analog-to-digital and digital-to-analog conversion interfaces, the system achieves direct analog optical signal processing without conversion latency, thereby resolving the technical contradiction between data storage capability and latency reduction.
Solution Approach 2:
The patent substitutes the mechanical/electrical digital memory system with an all-optical memory approach. Instead of converting optical signals to electrical/digital format for storage, the system uses optical signals directly to control photonic intensity modulators, eliminating the need for analog-to-digital conversion and reducing overall system latency.
2Reliability
If optical memory devices are used for data storage, then data retention during processing is achieved, but reliability decreases and write time latency becomes prohibitively high
Solution Approach 1:
The patent replaces unreliable optical memory devices with a hybrid approach using electrical analog memory. This substitution maintains the analog nature of photonic computing while leveraging the proven reliability and fast write speeds of electrical memory technologies, thereby resolving the contradiction between memory reliability and write time latency.
Solution Approach 2:
The patent introduces electrical analog memory as an intermediary between the optical input/output interfaces and the photonic processing core. This intermediary enables fast, reliable data storage and retrieval without requiring direct optical memory access, thus eliminating the reliability and latency issues associated with optical memory devices while maintaining analog signal integrity.
3Productivity
If analog optical signals are directly processed without digital conversion, then processing speed increases, but data storage and retrieval become problematic
Solution Approach 1:
The patent uses electrical analog memory as an intermediary storage device that can rapidly interface with analog optical signals. This intermediary enables fast data storage and retrieval without requiring full digital conversion, thereby maintaining high processing speeds while providing reliable data persistence throughout the photonic computing operation.
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
This configuration improves computational performance by eliminating the need for digital memory access and reducing latency, enabling faster data processing and storage in photonic computing systems.
Implementation Method 1
an array of photonic intensity modulators coupled to the photonic processor via a first set of optical connections
Implementation Method 2
an array of photodetectors coupled to the photonic processor via a second set of optical connections
Data Source
AI summary
Embodiments of the present disclosure are directed to an integrated circuit with a photonic processor and an electrical analog memory. The integrated circuit further includes an array of photonic intensity modulators coupled to the photonic processor via a first set of optical connections, and an array of photodetectors coupled to the photonic processor via a second set of optical connections. The electrical analog memory is directly coupled to the array of photodetectors and the array of photonic intensity modulators.