Silicon Photonics Interface for Zero Latency Packet Rerouting
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Solution Overview
Problem
High-performance computing (HPC) systems face latency issues due to the need for processor interruptions and optical-to-electrical conversions when routing data packets between nodes, especially in large networks with limited direct connections and intermediate node routing.
Innovation Solution
Implementing a photonics interface system that allows for zero-added latency communication by keeping data packets in the optical domain during routing, using direct optical connections between nodes and clusters, and assigning specific wavelengths for intra- and inter-cluster communications to reduce the need for conversions and intermediate node processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional electrical routing is used for data packets between nodes, then processor interruptions and optical-to-electrical conversions are required, but this increases latency
Solution Approach 1:
The patent replaces the traditional electrical signal transmission and processing system with an optical signal system. Data packets are transmitted as optical signals through the fabric without being converted to electrical signals, eliminating the need for optical-to-electrical conversions and processor interruptions, thereby reducing latency
Solution Approach 2:
The patent introduces an optical intermediary system that routes data packets between nodes using optical signals. The fabric acts as an optical intermediary that can route packets without converting them to electrical signals, allowing direct optical transmission and reducing the complexity of conversion processes
2Speed
If direct connections are established between all nodes in large networks, then communication speed is improved, but the number of physical cables increases exponentially
Solution Approach 1:
The patent makes the optical fabric a multi-functional intermediary that can route data packets to any node in the network. Instead of requiring dedicated direct connections between all node pairs, the fabric serves multiple routing functions, allowing any node to communicate with any other node through the optical fabric without exponential cable increases
Solution Approach 2:
The optical fabric acts as a universal intermediary that enables indirect communication between nodes without requiring direct physical connections. Data packets are routed through the fabric which handles the routing function, eliminating the need for exponential cable deployment while maintaining communication speed
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 significantly reduces latency and physical cable requirements, enabling efficient data transmission between nodes and clusters, and allows for scalable network topologies without exponential increases in fiber management costs.
Implementation Method 1
transmitting and receiving optical signals
Implementation Method 2
Each node within a cluster is assigned a frequency from a localized set of frequencies... Each node in a cluster can serve as a pass-through optical device for any data packets not intended for itself
Data Source
AI summary
Systems and methods are provided for zero-added latency communication between nodes over an optical fabric. In various embodiments, a photonic interface system is provided that comprises a plurality of optical routing elements and optical signal sources. Each node within a cluster is assigned an intra-cluster wavelength and an inter-cluster wavelength. All the nodes in a cluster are directly connected and each node in a cluster is directly connected to one node in each of the plurality of clusters. When an optical signal from a different cluster is received at a node serving as the cluster interface, the photonics interface system allows all wavelength signals other than the node's assigned wavelength to pass through and couple those signals to an intra-cluster transmission signal. Zero latency is added in rerouting the data through an intermediate node.