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Quasi-light Storage for Optical Data Packets

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Performance scaling comparison for free-space optical and electrical interconnection approaches.

M W Haney, M P Christensen

|February 15, 2008

Summary

Free-space optical interconnects offer significant advantages in bandwidth density, latency, and power consumption for complex, globally interconnected networks. Macro-optical elements scale better than micro-optical elements in these advanced computing applications.

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Area of Science:

Computer Engineering
Optical Communications
Integrated Circuit Design

Background:

Traditional electrical interconnections face limitations in bandwidth density and power consumption for large-scale computing.
Free-space optics presents a potential alternative for high-performance interchip communication.
Smart pixels are key components for enabling optical interconnects within integrated circuits.

Purpose of the Study:

To compare the projected performance of free-space optical and electrical interconnections.
To evaluate these interconnections based on smart-pixel input-output bandwidth density and packaging constraints.
To provide guidance on applying free-space optical interconnects to multiprocessor systems.

Main Methods:

Performance metrics for free-space optical and electrical interconnections were projected and compared.
Analysis included smart-pixel input-output bandwidth density and practical geometric packaging.
Scaling properties of macro-optical versus micro-optical elements were investigated.

Main Results:

Three-dimensional optical interconnects using smart pixels offer superior volume, latency, and power benefits for globally interconnected networks.
Interconnection approaches utilizing macro-optical elements demonstrate better scalability compared to micro-optical elements.
Micro-optical architectures face scaling limitations due to diffraction losses and the need for repeaters in high-bandwidth multichip systems.

Conclusions:

Free-space optical interconnects, particularly 3D approaches with smart pixels, are highly beneficial for large-scale, interconnected multiprocessor systems.
Macro-optical elements are preferable for achieving better scaling in optical interconnection architectures.
The study provides a framework for assessing the suitability of free-space optical interconnects for specific multiprocessor challenges.