Multiplexing in photonics as a resource for optical ternary content-addressable memory functionality
Author:
London Yanir1ORCID, Van Vaerenbergh Thomas2ORCID, Ramini Luca1, Descos Antoine1, Buonanno Luca1ORCID, Youn Jinsung3, Li Can4, Graves Catherine E.1, Fiorentino Marco1, Beausoleil Raymond G.1
Affiliation:
1. Hewlett Packard Labs , 820 N McCarthy Blvd , Milpitas , CA 95035 , USA 2. Hewlett Packard Labs , Hermeslaan 1A , 1831 Diegem , Belgium 3. Advanced Micro Devices Inc , Santa Clara , CA , USA 4. The University of Hong Kong , Hong Kong , Hong Kong
Abstract
Abstract
In this paper, we combine a Content-Addressable Memory (CAM) encoding scheme previously proposed for analog electronic CAMs (E-CAMs) with optical multiplexing techniques to create two new photonic CAM architectures—wavelength-division multiplexing (WDM) optical ternary CAM (O-TCAM) and time-division multiplexing (TDM) O-TCAM. As an example, we show how these two O-TCAM schemes can be implemented by performing minor modifications in microring-based silicon photonic (SiPh) circuits originally optimized for exascale interconnects. Here, our SiPh O-TCAM designs include not only the actual search engine, but also the transmitter circuits. For the first time, we experimentally demonstrate O-TCAM functionality in SiPh up to
∼
4
Gbps
${\sim} 4\,\,\text{Gbps}$
and we prove in simulation feasibility for speeds up to 10 Gbps, 10 times faster than typical E-TCAMs at the expense of higher energy consumption per symbol of our O-TCAM Search Engine circuits than the corresponding E-TCAMs. Finally, we identify which hardware and architecture modifications are required to improve the O-CAM’s energy efficiency towards the level of E-CAMs.
Publisher
Walter de Gruyter GmbH
Subject
Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology
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