Wavelength Selective Optical Switching for Data Center Power Reduction
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Solution Overview
Problem
Current optical switches in data center networks are inefficient due to high power consumption, long switching times, and high costs, particularly because they require a power-consuming electrical packet switching layer and are not suitable for mass production, with commercial 3D MEMS technology having a large footprint and high cost per port.
Innovation Solution
A wavelength selective optical switching arrangement that includes a switching matrix with de-multiplexers and 2×2 optical switches, such as micro-ring resonators, to group and route optical signals by wavelength, eliminating the need for a separate electrical packet switching layer and simplifying optical cabling, with each compute node directly connected to the optical switching layer and wavelengths assigned to compute domains for efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If commercial 3D MEMS optical space switches are used, then optical switching capability is provided, but the footprint is large, cost per port is high, and switching time is long
Solution Approach 1:
The patent segments the optical switching function into wavelength-selective switching units that can operate independently. Each unit handles specific wavelength groups, allowing parallel processing and reducing overall switching time while enabling modular mass production
Solution Approach 2:
The patent replaces mechanical MEMS mirrors with optical-based wavelength selection mechanisms (such as wavelength selective switches or optical filters) that have no moving parts, eliminating the mechanical limitations of MEMS while enabling faster optical-only switching
2Adaptability or versatility
If a hybrid packet/optical switching architecture is used, then some traffic routing capability is provided, but power consumption increases due to the electrical packet switching layer
Solution Approach 1:
The patent extracts and removes the electrical packet switching layer from the architecture, retaining only the essential wavelength-selective optical switching functions. This eliminates the power-consuming electrical conversion and processing while maintaining adequate routing capability through optical wavelength management
Solution Approach 2:
The patent enables optical signals to be routed and switched directly in the optical domain without conversion to electrical signals. The wavelength-selective switches use optical properties (wavelength, frequency) to perform switching functions that previously required electrical packet processing, making the system self-sufficient in the optical domain
3Quantity of substance
If wavelength multiplexing and switching are used to prepare signals before space switching, then the number of ports and optical fibers is reduced, but device complexity increases
Solution Approach 1:
The patent designs wavelength-selective switching units that perform multiple functions: wavelength filtering, signal routing, and switching control within a single integrated component. This multi-functionality reduces the need for separate wavelength management devices and simplifies the overall architecture despite the sophisticated wavelength multiplexing
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 optimizes power consumption, simplifies optical cabling, and reduces switching complexity by grouping wavelengths with common destinations, enabling faster and more efficient data transmission within data centers, specifically addressing the inefficiencies of existing optical switches.
Implementation Method 1
receive at an input port a group of optical signals, each optical signal being transmitted on a different wavelength
Implementation Method 2
2×2 optical switches, such as micro-ring resonators, to group and route optical signals by wavelength
Data Source
AI summary
A wavelength selective optical switching arrangement (23) comprises a set of input ports (61), a set of output ports (65); a switching matrix; and a plurality of de-multiplexers each comprising an aggregate port (62) and a plurality of tributary ports (64), each aggregate port being connected to an input port and each tributary port being connected to the switching matrix (57), the switching matrix being coupled between the tributary ports and the output ports. The wavelength selective optical switching arrangement is configured to receive at an input port a group of optical signals, each optical signal being transmitted on a different wavelength and being assigned to one of a plurality of destination nodes. The wavelength selective optical switching arrangement is further configured to de-multiplex the group of optical signals in a said demultiplexer; re-group the optical signals into destination groups according to their destination node; and route each destination group to a respective output port assigned to the destination group.