Fiber-Optic Feedthrough Vacuum Sealing for Cryogenic Signal Isolation
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Solution Overview
Problem
CMOS-based processors face limitations in transistor density scaling and high power consumption, especially due to leakage currents and the need for DC voltage, while superconducting logic devices require cryogenic temperatures, leading to inefficiencies in energy usage and cooling requirements.
Innovation Solution
An interconnect system that thermally isolates cryogenic and non-cryogenic environments using optical fibers and vacuum chemical seals, allowing for the connection of superconducting logic devices with CMOS devices, enabling efficient signal transfer and reducing power dissipation by using Josephson junctions and niobium interconnect metallization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If superconducting logic devices are used to reduce power consumption, then energy efficiency is improved, but the system requires cryogenic temperatures which increases device complexity and cooling requirements
Solution Approach 1:
The system is divided into two separate environments: a cryogenic environment for superconducting logic devices and a non-cryogenic environment for CMOS devices. Each environment is optimized for its specific temperature requirements, with the cryogenic chamber maintaining low temperatures only where superconducting devices are located, rather than cooling the entire system.
Solution Approach 2:
Optical fibers serve as an intermediary medium to transfer signals between the cryogenic and non-cryogenic environments. This allows superconducting devices to operate at low temperatures while interfacing with standard CMOS devices at room temperature, eliminating the need for direct thermal coupling.
2Temperature
If optical fibers are used to connect cryogenic and non-cryogenic environments, then thermal isolation is improved, but signal transfer complexity increases
Solution Approach 1:
Optical fibers act as an intermediary that transfers signals across the thermal boundary without conducting heat. The vacuum chemical seal further enhances this isolation while the optical interface enables signal transmission through the thermally isolated barrier.
Solution Approach 2:
Electrical or thermal signal transmission methods are replaced with optical transmission through fibers. This substitution allows signal transfer across the vacuum seal and thermal boundary without compromising the thermal isolation, as optical fibers have extremely low thermal conductivity.
3Temperature
If vacuum chemical seals are used to maintain thermal isolation, then temperature stability is improved, but manufacturing complexity increases
Solution Approach 1:
The vacuum chemical seal employs a composite structure combining vacuum-tight sealing materials with chemical sealant properties. This composite approach enables the seal to maintain both vacuum integrity and chemical bonding, achieving reliable thermal isolation while facilitating assembly through chemical curing processes.
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 interconnect system facilitates the integration of low-power superconducting logic devices with CMOS devices, achieving significant reductions in total system power consumption by maintaining thermal isolation and optimizing energy efficiency across different temperature environments.
Implementation Method 1
at least a first connector coupled to at least a first set of optical fibers, where the at least the first set of the optical fibers is coupled to the at least the first system operating in the first type of environment
Implementation Method 2
the at least one interconnect is embedded in a vacuum chemical seal such that the first type of environment is substantially thermally isolated from the second type of environment
Implementation Method 3
reducing power dissipation by using Josephson junctions and niobium interconnect metallization
Data Source
AI summary
Interconnect systems for coupling a first system operating in a first type of environment (e.g., a cryogenic environment) to a second system operating in a second type of environment (e.g., a non-cryogenic environment) are provided. An interconnect system includes a first connector coupled to optical fibers that are coupled to the first system operating in the first type of environment. The interconnect system further includes a second connector coupled to optical fibers that are coupled to the second system operating in the second type of environment. The interconnect system may include an optical window configured to couple optical signals between the optical fibers, and the optical window is configured to maintain a vacuum seal between the first type of environment and the second type of environment such that the first type of environment is substantially thermally isolated from the second type of environment.