Optical Interconnect Architecture for High-Performance Computing
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Solution Overview
Problem
As computing systems become more complex, the interconnect architecture to couple and communicate between components has increased in complexity to ensure bandwidth demand, but existing interconnect technologies struggle to provide high performance with maximum power savings across various market segments, including servers and mobile devices.
Innovation Solution
A new high-performance interconnect (HPI) architecture is introduced, featuring a layered protocol stack with a transaction layer, link layer, and physical layer, supporting point-to-point serial links and optical connections, and incorporating advanced power management and error handling mechanisms to optimize performance and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal repeaters and re-driver circuits are implemented to compensate for limits on physical channel length, then the communication distance and reliability are improved, but the device complexity and power consumption increase
Solution Approach 1:
The patent combines multiple functions (signal repetition, re-driving, equalization, and clock recovery) into a single integrated optical interconnect device. This merging approach maintains communication reliability over extended distances while reducing overall device complexity compared to implementing separate repeater and re-driver circuits.
Solution Approach 2:
The optical interconnect device performs multiple functions simultaneously including signal transmission, equalization, clock recovery, and data re-timing. This multi-functionality eliminates the need for separate dedicated circuits for each function, thereby improving reliability while controlling device complexity.
2Productivity
If multiple physical processors and devices are added to increase computing power, then the processing capability is improved, but the communication complexity and power consumption between components increase
Solution Approach 1:
The patent replaces traditional electrical signal transmission with optical signal transmission for inter-processor communication. This substitution enables higher bandwidth communication between multiple physical processors with lower power consumption, thereby increasing processing capability while reducing the energy overhead of component communication.
3Device complexity
If traditional electrical interconnects are used to connect multiple devices, then the device complexity is kept low, but the bandwidth and signal integrity deteriorate over distance
Solution Approach 1:
The patent substitutes optical transmission for electrical transmission in the interconnect architecture. This replacement maintains relatively simple device complexity while dramatically improving signal integrity and bandwidth over distance, as optical signals are immune to electromagnetic interference and signal degradation that plagues electrical interconnects.
4Productivity
If optical interconnect technology is implemented to improve bandwidth and reduce power consumption, then the communication efficiency is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent integrates multiple optical functions (modulator, equalizer, clock recovery circuit) into a single manufacturable device module. This integration approach improves communication efficiency through optical transmission while mitigating manufacturing difficulties by consolidating complex functions into unified components that can be produced using standard semiconductor fabrication processes.
Data Source
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AI summary
An optical element is to be coupled to a second device by the second electrical link. The particular optical element is further to receive a first signal from the second device over a first inbound lane of the second electrical link, receive a second signal from the second device over a second inbound lane of the second electrical link, and multiplex the first and second signals on a particular optical link to send the first and second signals to the first device.