Optical Switching Network for Dynamic Data Center Topology
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Solution Overview
Problem
Existing data center network architectures face challenges in balancing high bandwidth connectivity with cost efficiency and flexibility to adapt to varying traffic demands, as static network topologies are expensive, wasteful, and unable to scale, while hybrid approaches using electrical and optical interconnects are limited by assumptions about average traffic patterns.
Innovation Solution
A dynamic optical switching architecture that uses hop-by-hop routing and bidirectional optical network devices to construct a network topology that adapts to traffic demands, allowing for on-demand full-bandwidth connectivity between any subset of servers without requiring all-to-all electrical connectivity, leveraging reconfigurable optical devices and algorithms for adaptive network reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static network topology with all-to-all connectivity is used, then high bandwidth connectivity between all server pairs is ensured, but network cost and complexity increase significantly
Solution Approach 1:
The patent implements dynamic optical circuit switching that allows the network topology to be reconfigured in real-time based on actual traffic demands. Optical circuits can be established, modified, and torn down dynamically to connect only the server pairs that need high bandwidth at any given moment, rather than maintaining static all-to-all connectivity. This resolves the contradiction by providing high bandwidth connectivity on-demand while avoiding the complexity of permanent all-to-all connections.
Solution Approach 2:
The patent applies local quality by providing high bandwidth optical connectivity only to the specific server pairs that require it, rather than uniformly providing all-to-all connectivity across the entire network. The optical circuit switching enables selective provisioning of high-bandwidth paths where needed, while other server pairs can use standard electrical interconnects, thus reducing overall network complexity and cost while maintaining necessary performance.
2Stability of the object's composition
If static network topology is used, then network connectivity is established, but flexibility to adapt to varying traffic demands is lost
Solution Approach 1:
The patent employs dynamic optical circuit switching that enables the network to adapt its topology in real-time according to traffic patterns. The system can establish optical circuits between server pairs experiencing high traffic demands and tear them down when demands subside, providing both stable connectivity when needed and flexibility to adapt to changing conditions.
Solution Approach 2:
The patent implements feedback mechanisms that monitor network traffic patterns and use this information to dynamically reconfigure optical circuits. The system continuously gathers information about traffic demands and adjusts the optical network topology accordingly, ensuring both stable connectivity for active flows and adaptability to new traffic patterns.
3Adaptability or versatility
If static all-to-all connectivity is implemented, then arbitrary application mix is supported, but network resources are wasted when not all connections are needed
Solution Approach 1:
The patent applies local quality by providing high-bandwidth optical connectivity only to the specific server pairs that require it for their applications, rather than provisioning all-to-all connectivity. This enables support for diverse application mixes with varying connectivity requirements while avoiding the energy waste of maintaining unused high-bandwidth connections throughout the network.
Solution Approach 2:
The patent uses dynamic optical circuit switching to provision high-bandwidth connections only when and where applications require them. The system can rapidly establish and tear down optical circuits to match the actual needs of different application mixes, ensuring versatility in supporting various workloads while minimizing energy consumption by avoiding persistent unused connections.
4Adaptability or versatility
If electrical interconnects with hybrid optical add-on are used, then flexibility for traffic offloading is achieved, but re-wiring is still needed for higher throughputs
Solution Approach 1:
The patent implements comprehensive dynamic optical circuit switching that eliminates the need for re-wiring when scaling to higher throughputs. The optical network can dynamically reconfigure circuits and allocate bandwidth on-demand, allowing the network to scale flexibly by software control rather than physical re-wiring, thus improving ease of manufacture and scalability.
Solution Approach 2:
The patent creates a universal optical network infrastructure that can handle all traffic patterns and throughput requirements through dynamic reconfiguration, rather than requiring separate electrical and optical paths. The optical circuit switching fabric provides multi-functional capability to adapt to any traffic pattern or throughput demand without physical re-wiring, making the network universally adaptable.
Data Source
AI summary
An all-optical transmission system includes an optical switch matrix, a plurality of optical components communicating over the optical switch matrix, and a top of rack (ToR) switch coupled to each optical component. Each ToR switch communicates with the optical components and with other ToR switches. The optical component includes a send circuit and a receive circuit with the send circuit having a ToR transceiver to receive data, a multiplexer coupled to the ToR transceiver, a Wavelength Selective Switch (WSS) coupled to the multiplexer, and a circulator coupled to the WSS.