Multi-core fiber optical interconnect for high-density switch enclosures
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Solution Overview
Problem
Current data center network switches face challenges in increasing data rates due to physical space constraints and I/O density issues, as traditional optical fibers do not fit well inside switch enclosures, leading to reliability and cooling problems, and using multi-chip modules exacerbates these issues.
Innovation Solution
The implementation of multi-core fibers (MCFs) inside network devices to reduce cabling and increase spatial density, allowing for direct coupling of optical communication signals to electronic ASICs, using optical-to-optical connectors and coupling schemes like grating couplers or fan-out/fan-in elements to achieve high optical I/O density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional optical fibers are used inside network switches, then data transmission function is provided, but physical space constraints and I/O density issues occur
Solution Approach 1:
Multiple separate optical fiber cables are merged into a single multi-core fiber cable that contains multiple independent light-guiding cores. This consolidation reduces the number of individual cables entering the enclosure while maintaining the same optical communication capacity, directly resolving the space constraint problem.
Solution Approach 2:
The patent transitions from using multiple separate 1D cables to a single cable with multiple 1D cores arranged in a 2D cross-sectional pattern. This dimensional reorganization allows multiple optical channels to coexist within a single cable envelope, dramatically improving spatial efficiency inside the enclosure.
2Productivity
If multi-chip modules are used to increase data rates, then processing capacity is improved, but connector density and cabling complexity increase
Solution Approach 1:
The patent combines multiple optical communication functions (transmission, reception, routing) into integrated photonic circuits on single-chip modules. By merging these functions at the chip level rather than requiring separate components and complex cabling, data rates increase while cabling complexity decreases.
Solution Approach 2:
The patent replaces mechanical/electrical connection systems with optical connection systems. Instead of using traditional electrical cables and connectors between multi-chip modules, optical signals are transmitted directly through integrated photonic circuits, eliminating the need for complex physical cabling while enabling higher data rates.
3Productivity
If multiple optical cables are used to achieve high data traffic rates, then bandwidth is increased, but ventilation and cooling problems worsen
Solution Approach 1:
Multiple optical cable bundles are merged into a single multi-core fiber cable. This consolidation reduces the total volume of cabling material inside the enclosure, creating additional free space that improves air circulation and heat dissipation, thereby addressing ventilation and cooling problems while maintaining high data traffic rates.
4Loss of information
If traditional fiber coupling methods are used, then optical signal transmission is achieved, but electromagnetic interference occurs
Solution Approach 1:
The patent replaces electrical signal transmission with optical signal transmission throughout the system. By using photonic circuits instead of electronic circuits and optical fibers instead of electrical cables, the system eliminates electromagnetic interference entirely while maintaining signal integrity, as optical signals are immune to electromagnetic fields.
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
MCFs reduce the need for multiple optical cables, decrease connector density, enhance ventilation, and reduce electromagnetic interference, enabling higher data traffic rates while maintaining device reliability and form-factor.
Implementation Method 1
The MCF interconnect includes multiple fiber cores for routing the plurality of optical communication signals between the MCM and the panel
Implementation Method 2
the first end of the MCF has an angled facet configured to fold an optical path of the optical communication signals toward a surface of the EO chip
Data Source
AI summary
A network device includes an enclosure, a multi-chip module (MCM), an optical-to-optical connector, and a multi-core fiber (MCF) interconnect. The enclosure has a panel. The MCM is inside the enclosure. The optical-to-optical connector, which is mounted on the panel of the enclosure, is configured to transfer a plurality of optical communication signals. The MCF interconnect includes multiple fiber cores for routing the plurality of optical communication signals between the MCM and the panel. The MCF has a first end at which the multiple fiber cores are coupled to the MCM, and a second end at which the multiple fiber cores are connected to the optical-to-optical connector on the panel.