Optical Circuit Switching Matrix for Data Center Networks
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Solution Overview
Problem
Data center networks face challenges with increased scale, including high complexity, power consumption, and cost due to limited throughput, high over-subscription ratios, and latency, while existing optical networks struggle to efficiently switch data between a large number of servers at low cost and low complexity.
Innovation Solution
An optical circuit switching matrix with a star-structured, centralized, passive N×N architecture, using wavelength switching without active switching or buffering, where each user node is connected via a single optical fiber, and a centralized controller schedules wavelength assignments and timeslots to manage traffic demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If optical networks are used to increase throughput, then data transmission capacity is improved, but switching complexity and cost increase
Solution Approach 1:
The patent segments the optical switching function into wavelength division multiplexing (WDM) layers, where multiple data streams are transmitted simultaneously at different wavelengths. This segmentation allows the system to achieve high throughput by parallel transmission while maintaining simpler switching mechanisms at each wavelength layer, resolving the contradiction between throughput and switching complexity
Solution Approach 2:
The patent introduces wavelength as an additional dimension for data transmission alongside traditional spatial routing. By multiplexing data across multiple wavelengths, the system achieves higher throughput without proportionally increasing switching complexity, as wavelength switching can be implemented more simply than full optical crossbar switching
2Device complexity
If traditional electrical switching is used in data centers, then infrastructure is simpler, but latency and power consumption increase
Solution Approach 1:
The patent replaces electrical switching mechanisms with optical switching and wavelength division multiplexing. This substitution eliminates the latency inherent in electrical signal conversion and processing, while the WDM approach provides a simpler infrastructure by leveraging existing optical fiber networks, thus resolving the contradiction between infrastructure simplicity and latency
Solution Approach 2:
The patent changes the fundamental transmission parameter from electrical signals to optical signals, and introduces wavelength as a multiplexing parameter. This parameter change enables direct optical switching which reduces latency significantly compared to electrical switching, while the wavelength-based approach simplifies the overall infrastructure by avoiding complex electrical switching fabrics
3Adaptability or versatility
If more interconnections are added to data center networks, then connectivity is improved, but cost and complexity increase
Solution Approach 1:
The patent implements a universal optical switching fabric that can route any input wavelength to any output wavelength through a single centralized controller. This multi-functional approach provides full connectivity between all nodes without requiring separate dedicated interconnections for each connection type, thus achieving high adaptability while reducing the number of physical interconnections needed
Solution Approach 2:
The patent introduces a centralized optical controller as an intermediary that manages wavelength routing decisions. This controller mediates between multiple input and output ports, enabling flexible connectivity through wavelength assignment rather than requiring direct physical connections between all node pairs, thereby reducing the number of interconnections while maintaining high connectivity
4Use of energy by stationary object
If passive optical switching is used, then power consumption is reduced, but switching speed and capacity are limited
Solution Approach 1:
The patent employs periodic timeslot assignment where the optical switching matrix operates in cyclic time slots to route different wavelengths to different output ports. This periodic operation allows passive switching elements to be reused across multiple cycles, achieving high switching capacity and speed through time-division multiplexing while maintaining the low power consumption characteristic of passive optical switching
Solution Approach 2:
The patent implements continuous wavelength assignment and routing decisions that operate throughout the timeslot cycle without interruption. The centralized controller continuously assigns wavelengths to output ports based on demand, ensuring that the optical switching matrix is always actively routing data rather than idling, thus maintaining high switching speed and capacity while keeping power consumption low through efficient utilization of the passive switching architecture
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 solution enables efficient, low-cost, low-power, and scalable data switching with reduced latency, supporting high-capacity data transmission by switching data based on wavelength and timeslots, thereby addressing the limitations of existing data center networks.
Implementation Method 1
an optical coupler having at least one input port optically coupled to the plurality of optical ports
Implementation Method 2
a wavelength demultiplexer having an input optically coupled to the output port of the optical coupler, and a plurality of output ports
Data Source
AI summary
An optical circuit switching matrix includes a plurality of optical ports, each optical port being optically coupled to a respective one of a plurality of user nodes and an optical coupler having at least one input port optically coupled to the plurality of optical ports, and an output port. The optical circuit switching matrix also includes a wavelength demultiplexer having an input optically coupled to the output port of the optical coupler, and a plurality of output ports, each output port being optically coupled to a respective one of the plurality of optical ports.