Photonics-Optimized Processor System Interconnects
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Solution Overview
Problem
Current processor micro-architectures face performance bottlenecks due to limited bandwidth and high latency in communication between CPU and memory, particularly in data-intensive applications, which is exacerbated by the Von Neumann bottleneck and the limitations of copper-based communication technologies.
Innovation Solution
The implementation of a photonics-optimized processor system using integrated silicon photonics (ISP) to reduce power consumption, increase bandwidth, and decrease latency by replacing copper connections with optical fibers, allowing for more efficient communication between processor chips and memory, thereby optimizing system design for high-performance computing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If copper-based communication technology is used for inter-chip communication, then device complexity is reduced and ease of manufacture is improved, but bandwidth is limited and latency is high
Solution Approach 1:
The patent replaces copper-based electrical communication with optical communication using photonic components. Specifically, it substitutes electrical signals transmitted through copper traces with optical signals transmitted through waveguides and optical fibers, thereby achieving higher bandwidth and lower latency while managing the increased complexity through integrated photonic circuits
Solution Approach 2:
The patent changes the fundamental parameter of signal transmission from electrical to optical domain. By using light instead of electricity for data transmission between processor chips, the system achieves dramatically higher bandwidth and lower latency, transforming the communication medium's physical properties to overcome the Von Neumann bottleneck
2Productivity
If more processor chips are packaged in a smaller volume to increase density, then productivity is improved through higher parallel processing capacity, but heat dissipation becomes more difficult and power density increases
Solution Approach 1:
The patent replaces copper interconnects with optical photonic interconnects, which significantly reduce power consumption and heat generation. Optical communication consumes less power than electrical communication at high data rates, thereby reducing the thermal load in high-density processor configurations and enabling higher parallel processing capacity without proportional increases in heat dissipation challenges
3Speed
If the length of IPI physical media is minimized to reduce latency, then speed is improved, but device complexity increases due to tighter packaging constraints
Solution Approach 1:
The patent integrates photonic components directly within or adjacent to processor chips, nesting the optical communication infrastructure within the processor package itself. This integration minimizes the physical length of inter-chip interconnects, reducing propagation latency while managing packaging complexity through co-integration of photonic and electronic components in a compact architecture
Solution Approach 2:
The patent introduces photonic components as intermediary elements between processor chips, using optical waveguides and couplers as mediators to transmit data signals. This intermediary optical layer enables faster signal propagation compared to electrical copper interconnects, achieving lower latency despite the constraints of tight packaging in high-density configurations
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 approach enables a significant reduction in latency and power consumption, allowing for a dramatic increase in bandwidth and performance, enabling the packaging of thousands of processor chips in a small volume with reduced size and energy requirements, suitable for supercomputers and datacenters.
Implementation Method 1
The at least one input/output (I/O) component of at least one of the processor chips may be configured to directly drive the first photonic component
Implementation Method 2
replacing copper connections with optical fibers
Data Source
AI summary
A photonics-optimized multi-processor system may include a plurality of processor chips, each of the processor chips comprising at least one input/output (I/O) component. The multi-processor system may also include first and second photonic components. The at least one I/O component of at least one of the processor chips may be configured to directly drive the first photonic component and receive a signal from the second photonic component. A total latency from any one of the processor chips to data at any global memory location may not be dominated by a round trip speed-of-light propagation delay. A number of the processor chips may be at least 10,000, and the processor chips may be packaged into a total volume of no more than 8 m3. A density of the processor chips may be greater than 1,000 chips per cubic meter.