Electro-Optical Bridge Link for High-Density Chip Interconnects
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Solution Overview
Problem
Existing chip-to-chip interconnect technologies face limitations in interconnect density and signaling rate due to electrical interconnects, which restrict bandwidth and architectural flexibility in multi-chip packages.
Innovation Solution
Integration of electro-optical bridge links with a semiconductor substrate, featuring optical waveguides and electro-optical conversion structures, to facilitate high-density and high-data-rate transmissions by converting electrical signals to optical and back to electrical within a single substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrical interconnects are used for chip-to-chip communication, then the interconnect structure is simple and easy to manufacture, but the interconnect density and signaling rate are limited
Solution Approach 1:
The patent replaces electrical interconnects (electromagnetic field-based) with optical waveguides (optical field-based) for signal transmission. This substitution enables significantly higher interconnect density and signaling rates while maintaining manufacturability through standard semiconductor fabrication processes adapted for photonic structures.
Solution Approach 2:
The patent changes the fundamental transmission medium parameter from electrical conductors to optical waveguides, enabling operation at optical frequencies rather than electrical frequencies. This parameter change directly addresses the signaling rate limitation while the integrated electro-optical converters maintain compatibility with existing electrical interfaces.
2Productivity
If optical waveguides and electro-optical converters are integrated into the substrate, then the signaling bandwidth increases by 1-2 orders of magnitude, but the device complexity increases
Solution Approach 1:
The patent merges electrical interconnect functionality and optical waveguide functionality into a single integrated substrate. The electro-optical converters are directly integrated with the waveguides, eliminating the need for separate conversion devices and reducing overall system complexity despite the advanced functionality achieved.
Solution Approach 2:
The substrate is designed to perform multiple functions: electrical signal routing, optical signal generation, optical signal transmission, and optical-to-electrical conversion, all within a single device structure. This multi-functionality achieves high signaling bandwidth without proportionally increasing device complexity.
3Ease of manufacture
If existing electrical interconnect architectures are used, then the manufacturing process is well-established and cost-effective, but the interconnect density reaches limits that constrain architectural flexibility
Solution Approach 1:
The patent segments the interconnect function into distinct optical channels within the waveguide structure, allowing independent routing and higher density connections. This segmentation enables greater architectural flexibility while the overall manufacturing process remains compatible with established semiconductor fabrication techniques.
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
This solution significantly enhances chip-to-chip interconnect signaling bandwidth by 1-2 orders of magnitude compared to purely electrical interconnects, addressing the limitations of existing technologies.
Implementation Method 1
a first electro-optical converter coupled to receive the first electrical signal and to generate a first optical signal based on the first electrical signal
Implementation Method 2
a first waveguide coupled to receive and propagate the first optical signal
Implementation Method 3
a first photodetector coupled to receive the first optical signal from the first waveguide and to generate a second electrical signal based on the first optical signal
Data Source
AI summary
Techniques and mechanisms for providing a bridge between integrated circuit (IC) chips. In an embodiment, the bridge device comprises a semiconductor substrate having disposed thereon contacts to couple the bridge device to two IC chips. Circuit structures and photonic structures of a bridge link are integrated with the substrate. The structures include an optical waveguide coupled between an electrical-to-optical signal conversion mechanism and an optical-to-electrical conversion mechanism. The bridge device converts signaling from an electrical domain to an optical domain and back to an electrical domain. In another embodiment, optical signals received via different respective contacts of an IC chip are converted by the bridge device, where the optical signals are multiplexed with each other and variously propagated with the same optical waveguide.