Photonic IC Package Cavity for High-Bandwidth Memory Interconnects
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Solution Overview
Problem
Conventional computing systems face limitations in processing capacity and data movement, leading to significant power consumption, poor performance, and excessive latency due to memory and interconnect bandwidth constraints, which are exacerbated by the increasing demands of artificial intelligence computing.
Innovation Solution
A hybrid electronic-photonic network-on-chip (NoC) system is implemented, utilizing photonic integrated circuits (PICs) and electronic integrated circuits (EICs) within a semiconductor package, with bidirectional photonic channels for efficient data transfer, reducing power consumption and increasing processing speed by leveraging optical signals for data movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional electronic interconnects are used for data movement between chips, then device complexity is reduced, but power consumption increases and processing speed decreases
Solution Approach 1:
The patent merges electronic integrated circuits (EICs) and photonic integrated circuits (PICs) into a single hybrid semiconductor package, creating a unified system where electronic components handle computation and photonic components handle data transmission. This integration allows the system to leverage both electronic and photonic advantages, reducing power consumption for data movement while maintaining manageable device complexity through unified packaging.
Solution Approach 2:
The patent replaces conventional electronic signal transmission with optical signal transmission for data movement between chips. By substituting electrical signals with optical signals in the interconnect domain, the system achieves lower power consumption and higher transmission speeds, while electronic circuits continue to handle processing tasks where they remain superior.
2Speed
If data is transmitted between chips using conventional interconnects, then device complexity is minimized, but processing speed decreases and latency increases
Solution Approach 1:
The patent combines EICs and PICs in a hybrid package, enabling high-speed optical data transmission between chips while electronic circuits maintain their processing functions. This merging allows the system to achieve faster processing speeds through photonic interconnects without completely redesigning the computational architecture.
Solution Approach 2:
The patent substitutes optical transmission for electrical transmission in the interconnect layer, replacing conventional electronic interconnects with photonic channels. This substitution enables significantly higher data transmission speeds and lower latency, as optical signals can travel faster and carry more data simultaneously through wavelength division multiplexing.
3Productivity
If memory bandwidth is increased using conventional electronic methods, then data transfer capacity improves, but power consumption increases significantly
Solution Approach 1:
The patent replaces electronic data transmission with optical data transmission for memory interconnects. By using photonic channels instead of electrical channels for data movement between memory and compute units, the system achieves higher bandwidth with significantly lower power consumption, as optical transmission does not suffer from the same resistive losses as electrical transmission.
Solution Approach 2:
The patent integrates photonic memory interconnects with electronic compute units in a hybrid package, creating a unified memory-subsystem that leverages optical transmission for high-bandwidth, low-power data movement between memory arrays and processing elements.
4Use of energy by moving object
If photonic integrated circuits are embedded in semiconductor packages, then power consumption is reduced and processing speed is increased, but manufacturing complexity increases
Solution Approach 1:
The patent merges EICs and PICs into a single hybrid semiconductor package using unified packaging processes. By integrating both electronic and photonic components in one package and using standardized packaging techniques, the system reduces manufacturing complexity compared to assembling separate electronic and photonic modules, while still achieving the power and performance benefits of photonic 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 system achieves reduced power consumption and increased processing speed by enhancing data locality and minimizing energy losses, particularly in artificial neural networks, through the use of photonic channels for data transfer, thereby addressing bandwidth limitations in electronic domains.
Implementation Method 1
the passive portion comprising an optical transmission medium configured to allow an optical signal to propagate to or from the active portion of the PIC
Implementation Method 2
the cavity being filled with a transparent (i.e., optically transparent) medium such that the optical signal can be received from or transmitted to the passive portion of the PIC through the cavity
Data Source
AI summary
A package includes a photonic integrated circuit (PIC) disposed on a substrate and comprising a semiconductor die hosting an active portion and a passive portion mutually coupled, the active portion being configured to consume electrical power when activated, and the passive portion comprising an optical transmission medium configured to propagate an optical signal to or from the active portion of the PIC; an electronic integrated circuit (EIC) electrically coupled to the active portion of the PIC and comprising components that electrically operate on the active portion of the PIC; and a packaging compound at least partially encapsulating the PIC, the packaging compound defining a cavity on a side of the semiconductor die that is opposite from the substrate, the cavity being filled with an optically transparent medium such that the optical signal can be received from or transmitted to the passive portion of the PIC through the cavity.