Photonic Module Interconnects for Scalable Memory Bandwidth
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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 and the need for memory chips to be closely positioned to processors.
Innovation Solution
The development of photonic communication platforms using photonic modules with optical waveguides and distribution networks that enable optical communication between modules, allowing for scalable memory capacity and bandwidth without the constraints of parasitic impedance, and utilizing common photomask sets to reduce manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If memory chips are closely positioned to processors using silicon interposers, then bandwidth and capacity can be increased, but parasitic impedance increases and scalability is limited
Solution Approach 1:
The patent replaces electrical interconnects with optical interconnects using photonic modules. Optical waveguides substitute for electrical traces, eliminating parasitic impedance associated with electrical connections. This allows memory chips to be positioned farther from processors without bandwidth degradation, resolving the contradiction between increased memory capacity and parasitic impedance.
Solution Approach 2:
The patent introduces photonic modules as intermediary components between processors and memory chips. These modules contain optical waveguides that mediate the connection, allowing electrical signals to be converted to optical signals for transmission. This intermediary approach enables scalable memory configurations without the parasitic impedance problems of direct electrical interconnects.
2Manufacturing precision
If multiple different photomask sets are used for photonic module fabrication, then manufacturing precision can be improved, but manufacturing cost increases
Solution Approach 1:
The patent designs photonic modules with universal photomask sets that can fabricate multiple types of photonic modules using the same masks. The photomasks are designed to create waveguides and optical components that can be configured differently through layout variations rather than requiring different masks. This universality reduces manufacturing costs while maintaining precision through standardized fabrication processes.
Solution Approach 2:
The patent segments the photonic module design into standardized components that can be assembled in different configurations using the same photomask sets. By dividing the system into modular elements (waveguides, couplers, switches) that can be arranged differently on the same mask, the patent achieves manufacturing precision without requiring multiple specialized mask sets for different 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 enabling scalable memory bandwidth and capacity, allowing for efficient data access in data-intensive applications, and reducing manufacturing costs through the use of common photomask sets for photonic module fabrication.
Implementation Method 1
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.