Photonic Memory Interconnect Modules Beyond Parasitic Impedance
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Solution Overview
Problem
Conventional computing systems face limitations in scaling memory capacity and bandwidth, particularly for data-intensive applications like deep learning, due to parasitic impedance in silicon interposers, which restricts the number of memory chips and increases power consumption.
Innovation Solution
The development of photonic communication platforms using photonic modules with optical distribution networks and waveguides, patterned with common photomasks to enable scalable memory capacity and bandwidth, immune to parasitic impedance, and adaptable to various computer architectures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical communication using metal traces is used to connect memories and processors, then data access is enabled, but parasitic impedance increases and memory bandwidth is limited
Solution Approach 1:
The patent replaces electrical communication (metal traces) with optical communication (photonic modules, waveguides, and optical interconnects). This substitution eliminates parasitic impedance inherent in electrical systems while enabling high-bandwidth data transfer between processors and memory chips through optical signals that propagate through waveguide structures.
Solution Approach 2:
The patent introduces photonic modules as intermediary components between processors and memory chips. These modules contain optical distribution networks and waveguides that mediate data transmission, converting electrical signals to optical signals for transmission and back to electrical signals for processing, thereby isolating the communication path from parasitic impedance effects.
2Quantity of substance
If the number of memory chips is increased to scale memory capacity, then memory capacity increases, but power consumption increases and manufacturing complexity increases
Solution Approach 1:
The patent replaces electrical interconnects with optical interconnects to scale memory capacity. Optical communication consumes less power for high-bandwidth数据传输, enabling increased memory capacity without proportional increases in power consumption. The waveguide-based optical network allows multiple memory chips to be connected efficiently.
Solution Approach 2:
The patent transitions from two-dimensional planar electrical traces to three-dimensional optical waveguide structures. This enables vertical stacking and multi-layer interconnect architectures that scale memory capacity in the vertical dimension rather than horizontally, reducing power consumption and improving density.
3Manufacturing precision
If different photomask sets are used for different photonic modules, then manufacturing precision is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent designs photonic modules with standardized geometries and configurations that can be patterned using a single common photomask set. This universal design approach allows the same photomask to fabricate multiple photonic modules with consistent performance characteristics, reducing manufacturing costs while maintaining precision through optimized mask design.
Solution Approach 2:
The patent merges multiple photonic module patterns into a single photomask design. By combining the patterning requirements for multiple modules into one mask, the manufacturing process is simplified, requiring only one photomask set for production while achieving precise patterning of all modules through the unified design.
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
These platforms overcome the limitations of conventional systems by allowing memory chips to be positioned farther from processors, enabling higher memory bandwidth and capacity, and reducing manufacturing costs through the use of common photomask sets, while maintaining low power consumption.
Implementation Method 1
a first optical waveguide optically coupling the optical distribution network to a first neighboring photonic module
Implementation Method 2
optically coupling the optical distribution network to neighboring photonic modules
Implementation Method 3
an out-of-plane optical coupler optically coupled to the optical distribution network
Data Source
AI summary
Described herein are photonic communication platforms that can overcome the memory bottleneck problem, thereby enabling scaling of memory capacity and bandwidth well beyond what is possible with conventional computing systems. Some embodiments provide photonic communication platforms that involve use of photonic modules. Each photonic module includes programmable photonic circuits for placing the module in optical communication with other modules based on the needs of a particular application. The architecture developed by the inventors relies on the use of common photomask sets (or at least one common photomask) to fabricate multiple photonic modules in a single wafer. Photonic modules in multiple wafers can be linked together into a communication platform using optical or electronic means.