Optically Switched Network Topology for Scalable HPC Thermal Management
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Solution Overview
Problem
Existing high-performance computing networks face scalability issues and thermal management challenges as the central switch's circuitry increases in size and density, leading to interference and 'hot spots' in large-scale systems.
Innovation Solution
An optically switched network with a passive optical switch and virtual data and control planes, utilizing wavelength-division multiplexing and distributed-arbitration logic to provide any-to-all parallel connectivity and independent arbitration among end-nodes, implemented using silicon-photonic chips and fast-tunable lasers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a central switch with increasing circuitry density is used to accommodate more computing nodes, then the network capacity and connectivity are improved, but thermal management becomes difficult and hot spots are generated
Solution Approach 1:
The patent divides the centralized switching function into distributed arbitration logic at each end-node, eliminating the need for a large central switch. Each end-node independently makes arbitration decisions, segmenting the control function across multiple nodes to reduce thermal concentration and improve scalability.
Solution Approach 2:
The patent replaces electronic switching mechanisms with optical switching. Optical components generate significantly less heat than electronic circuitry, allowing the network to scale to more computing nodes without thermal management issues or hot spots.
2Adaptability or versatility
If a central switch with increasing circuitry density is used to accommodate more computing nodes, then the network capacity and connectivity are improved, but the device complexity increases
Solution Approach 1:
The patent divides the centralized switching function into distributed arbitration logic at each end-node, eliminating the need for a large central switch. Each end-node independently makes arbitration decisions, segmenting the control function across multiple nodes to reduce thermal concentration and improve scalability.
Solution Approach 2:
The patent extracts the arbitration function from the central switch and places it at each end-node. This removes the complex circuitry required for centralized arbitration, interface circuitry for each node, and switching matrix from a single device, distributing these functions across simpler end-node components.
3Use of energy by stationary object
If optical switching is implemented to reduce thermal issues, then thermal management and power consumption are improved, but the network architecture complexity increases
Solution Approach 1:
The patent merges the virtual data plane and virtual control plane onto a single physical optical network infrastructure. Both planes share the same optical switching fabric and physical connections, reducing hardware duplication and simplifying the overall network architecture despite the sophisticated arbitration protocols used.
Solution Approach 2:
The patent creates a universal optical network architecture that handles both data traffic and control traffic over the same physical infrastructure. The optical switch fabric provides universal connectivity for both planes, eliminating the need for separate dedicated hardware for each function and reducing overall system complexity.
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 design allows for scalable, high-performance communication among computing nodes with reduced thermal issues and power consumption, maintaining comparable performance to electronic switching while minimizing circuit complexity and thermal challenges.
Implementation Method 1
a passive optical switch with N inputs and N outputs, wherein the passive optical switch can communicate different wavelengths from each of the N inputs to each of the N outputs
Implementation Method 2
N pairs of optical fibers, wherein each pair connects one of the N end-nodes to one of the N inputs and one of the N outputs of the passive optical switch
Implementation Method 3
each of the N end-nodes includes a fast-tunable laser to facilitate transmissions from the end-node
Data Source
AI summary
The disclosed embodiments provide an optically switched network system. This system includes a passive optical switch with N inputs and N outputs, which can communicate different wavelengths from each of the N inputs to each of the N outputs. It also includes N end-nodes, and N pairs of optical fibers, wherein each pair connects one of the N end-nodes to one of the N inputs and one of the N outputs. The optically switched network is organized into a virtual data plane and a virtual control plane, which both communicate through the same underlying physical network. The virtual data plane provides any-to-all parallel connectivity for data transmissions among the N end-nodes. The virtual control plane is organized as a ring that serially connects the N end-nodes, wherein the ring communicates arbitration information among distributed-arbitration logic at each of the N end-nodes.