Scaling Routers with In-Package Optics and High-Bandwidth Memories
Isaac Keslassy, Ilay Yavlovich, Jose Yallouz, Tzu-Chien Hsueh, Yeshaiahu Fainman, Bill Lin

TL;DR
This paper introduces a novel high-bandwidth, scalable internet router architecture using in-package optics, chiplets, and HBM memories to achieve petabit/sec throughput within a single package, emphasizing power consumption considerations.
Contribution
It presents a new router design integrating in-package optics, chiplets, and HBM memories, with a split-parallel switch architecture and a novel traffic interleaving algorithm for scalable high-speed routing.
Findings
Achieves petabit/sec throughput in a single package.
Passive spatial division with minimal traffic imbalance.
HBM-based shared-memory architecture with cyclical interleaving.
Abstract
This paper aims to apply two major scaling transformations from the computing packaging industry to internet routers: the heterogeneous integration of high-bandwidth memories (HBMs) and chiplets, as well as in-package optics. We propose a novel internet router architecture that employs these technologies to achieve a petabit/sec router within a single integrated package. At the top-level, we introduce a novel split-parallel switch architecture that spatially divides (without processing) the incoming fibers and distributes them across smaller independent switches without intermediate OEO conversions or fine-tuned per-packet load-balancing. This passive spatial division enables scaling at the cost of a coarser traffic load balancing. Yet, through extensive evaluations of backbone network traffic, we demonstrate that differences with fine-tuned approaches are small. In addition, we propose…
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Taxonomy
TopicsAdvanced Optical Network Technologies · Interconnection Networks and Systems · Optical Network Technologies
