Photonic Memory Interconnects Without Silicon Interposer Bottlenecks
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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 silicon interposers with metal traces are used to connect memory chips to processors, then electrical communication is enabled, but parasitic impedance increases and memory bandwidth is limited
Solution Approach 1:
The patent replaces electrical interconnects (metal traces on silicon interposers) with optical interconnects (photonic modules, waveguides, and optical distribution networks). This substitution eliminates parasitic impedance inherent in electrical systems while enabling high-bandwidth memory communication through photonic channels that are immune to electrical interference and impedance limitations.
Solution Approach 2:
The invention changes the fundamental communication parameter from electrical signals to optical signals. By using light instead of electricity for data transmission between memory chips and processors, the system achieves higher bandwidth and eliminates the parasitic impedance that constrains electrical interconnects, while maintaining compatibility through photonic modules that interface with existing memory architectures.
2Quantity of substance
If multiple memory chips are connected using conventional electrical interconnects, then memory capacity is increased, but power consumption increases and scalability is limited
Solution Approach 1:
The patent substitutes optical communication for electrical communication in memory systems. By using photonic modules with waveguide-based optical distribution networks, the system achieves high-capacity memory expansion with significantly reduced power consumption compared to conventional electrical interconnects, as optical signals eliminate resistive heating and enable more efficient data transfer at scale.
3Manufacturing precision
If photonic modules are manufactured with individual photomask sets, then manufacturing precision is maintained, but manufacturing cost increases
Solution Approach 1:
The patent implements a universal photomask set that can pattern multiple different photonic module designs. This single photomask set incorporates design features that allow it to manufacture various photonic modules (with different configurations of waveguides, optical distribution networks, and coupling structures) by utilizing different regions or layers of the same mask, thereby reducing manufacturing costs while maintaining precision through consistent patterning processes.
Solution Approach 2:
The invention merges multiple photomask designs into a single unified photomask set. By combining the patterning capabilities for different photonic module types into one mask, the system achieves cost-effective manufacturing through shared fabrication processes, while maintaining manufacturing precision by using the same high-precision photolithography infrastructure for all module types.
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 for increased memory bandwidth and capacity, reducing manufacturing costs through shared photomask sets, and enabling flexible architectures, supporting high-performance applications like deep learning without the need for memory chips to be proximate to processors.
Implementation Method 1
a first optical waveguide optically coupling the optical distribution network to a first neighboring photonic module
Implementation Method 2
an optical distribution network; a first optical waveguide optically coupling the optical distribution network to a first neighboring photonic module
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.