Wavelength-division multiplexing for multi-chip optical interconnects
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Solution Overview
Problem
As semiconductor technology advances, microprocessors face challenges with increasing latency in global on-chip wires and rising power consumption, which limits further performance gains, particularly in multi-core and multi-threaded systems that require high-bandwidth communication.
Innovation Solution
A multi-chip system utilizing proximity communication and wavelength-division multiplexing (WDM) for optical signals, allowing direct communication between semiconductor dies through optical signal paths without intermediate electrical processing, reducing latency and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional conductive wires are used for on-chip communication, then electrical signals can be transmitted, but latency increases as wire length increases while thickness decreases
Solution Approach 1:
The patent replaces electrical signal transmission through conductive wires with optical signal transmission through waveguides. This substitution eliminates the latency penalty associated with long, thin conductive wires by using photonic carriers that can maintain high transmission speeds over longer distances without the same resistive and capacitive constraints.
Solution Approach 2:
The patent changes the fundamental parameter of signal transmission from electrical to optical domain. By using light instead of electricity for communication, the system achieves lower latency and higher bandwidth while avoiding the physical constraints that limit conductive wire performance at scaled dimensions.
2Productivity
If integration density and clock frequency are increased, then microprocessor performance improves, but power consumption increases beyond cooling capabilities
Solution Approach 1:
The patent substitutes electrical interconnects with optical waveguides to reduce power consumption. Optical transmission consumes less power for long-distance communication on-chip, enabling higher integration densities and clock frequencies without exceeding thermal management capabilities.
Solution Approach 2:
The patent divides the chip into multiple semiconductor dies that communicate optically through waveguides. This segmentation allows each die to be optimized independently while using low-power optical interconnects for inter-die communication, thereby improving overall performance without proportionally increasing power consumption.
3Loss of time
If multiple processor cores are used, then computation and communication operations are localized reducing global delays, but communication bandwidth requirements increase to terabits-per-second
Solution Approach 1:
The patent introduces wavelength-division multiplexing to add a spectral dimension to the communication channel. By transmitting multiple optical signals simultaneously at different wavelengths through the same waveguide, the system achieves terabit-per-second bandwidth without increasing physical infrastructure.
Solution Approach 2:
The patent makes the optical waveguide infrastructure multi-functional by enabling it to carry multiple independent data streams simultaneously through wavelength multiplexing. This allows a single physical interconnect to serve multiple communication channels, meeting the escalating bandwidth demands of multi-core processors.
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 approach enables high-bandwidth, low-latency communication within and between chip modules, facilitating the creation of high-performance arrays with reduced power dissipation and complexity, effectively addressing the limitations of conventional conductive wires.
Implementation Method 1
the given CM is configured to communicate optical signals with other CMs through an optical signal path using optical communication, and the optical signals are encoded using wavelength-division multiplexing (WDM)
Implementation Method 2
a given CM in the array includes a semiconductor die that is configured to communicate data signals with one or more adjacent CMs through electromagnetic proximity communication using proximity connectors
Data Source
AI summary
Embodiments of a system that includes an array of chip modules (CMs) is described. In this system, a given CM in the array includes a semiconductor die that is configured to communicate data signals with one or more adjacent CMs through electromagnetic proximity communication using proximity connectors. Note that the proximity connectors are proximate to a surface of the semiconductor die. Moreover, the given CM is configured to communicate optical signals with other CMs through an optical signal path using optical communication, and the optical signals are encoded using wavelength-division multiplexing (WDM).