Programmable Photonic Interposers for Low-Power Chip Communication
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Solution Overview
Problem
Modern computing systems face scalability limitations due to power consumption, thermal issues, bandwidth constraints, and challenges in maintaining coherence and consistency across multiple memory chips, with existing interconnect technologies being power inefficient and bandwidth-limited.
Innovation Solution
The development of photonic interposers that utilize programmable photonic tiles and optical communication to enable low-power, high-bandwidth inter-chip and intra-chip connections, allowing for flexible network topologies and efficient integration of heterogeneous computing components on a single substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If electrical interconnects are used to connect memories and processors, then electrical communication is achieved, but power consumption increases and bandwidth is limited
Solution Approach 1:
The patent replaces electrical interconnects with photonic interconnects, substituting electrical signal transmission with optical signal transmission through waveguides. This fundamental substitution enables high-bandwidth communication while reducing power consumption, as photonic interconnects do not suffer from the same electrical resistance and capacitive coupling limitations that constrain electrical interconnects.
Solution Approach 2:
The patent changes the physical parameter of signal transmission from electrical to optical domain. By using different wavelengths of light for different communication channels and implementing photonic modulation, the system achieves higher bandwidth and lower power consumption compared to traditional electrical interconnects operating at electrical frequencies.
2Quantity of substance
If multiple memory chips are integrated to increase capacity, then storage capacity increases, but thermal constraints and coherence management become more difficult
Solution Approach 1:
The patent replaces electrical interconnects with photonic interconnects to connect multiple memory chips, substituting heat-generating electrical signals with low-heat optical signals. This substitution significantly reduces thermal constraints when integrating multiple memory chips, as photonic interconnects generate minimal heat compared to their electrical counterparts.
3Adaptability or versatility
If traditional electrical interconnects are used, then existing infrastructure is maintained, but scalability is limited
Solution Approach 1:
The patent substitutes electrical interconnect infrastructure with photonic interconnect infrastructure, enabling scalable integration of multiple processing and memory chips. The photonic interconnect architecture using waveguides and optical switches provides a scalable framework that can accommodate increasing numbers of chips without the power and bandwidth limitations of electrical interconnects.
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
The photonic interposers provide high-bandwidth, low-latency communication, reduce thermal constraints, and enhance coherence management across memory chips, improving the performance and scalability of computing systems.
Implementation Method 1
an optical distribution network including a first set of bus waveguides optically coupled to the transceiver, a second set of bus waveguides
Implementation Method 2
each programmable interconnection comprising a waveguide crossing and an active coupler
Data Source
AI summary
Photonic interposers that enable low-power, high-bandwidth inter-chip (e.g., board-level and/or rack-level) as well as intra-chip communication are described. Described herein are techniques, architectures and processes that improve upon the performance of conventional computers. Some embodiments provide photonic interposers that use photonic tiles, where each tile includes programmable photonic circuits that can be programmed based on the needs of a particular computer architecture. Some tiles are instantiations of a common template tile that are stitched together in a 1D or a 2D arrangement. Some embodiments described herein provide a programmable physical network designed to connect pairs of tiles together with photonic links.