Journal of Lightwave Technology | Benjamin J, Gerard T, Lavery D, Bayvel P, Zervas G. | We introduce PULSE, a sub-μs optical circuit switched data centre network architecture controlled by distribu...
PULSE: Optical Circuit Switched Data Center Architecture Operating at Nanosecond Timescales
Abstract
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We introduce PULSE, a sub-μs optical circuit switched data centre network architecture controlled by distributed hardware schedulers. PULSE is a flat architecture that uses parallel passive coupler-based broadcast and select networks. We employ a novel transceiver architecture, for dynamic wavelength-timeslot selection, to achieve a reconfiguration time down to O(100ps), establishing timeslots of O(10ns). A novel scheduling algorithm that has a clock period of 2.3ns performs multiple iterations to maximize throughput, wavelength usage and reduce latency, enhancing the overall performance.
In order to scale, the single-hop PULSE architecture uses sub-networks that are disjoint by using multiple transceivers for each node in 64 node racks. At the reconfiguration circuit duration (epoch = 120 ns), the scheduling algorithm is shown to achieve up to 93% throughput and 100% wavelength usage of 64 wavelengths, incurring an average latency that ranges from 0.7-1.2 μs with best-case 0.4 μs median and 5 μs tail latency, limited by the timeslot (20 ns) and epoch size (120 ns). We show how the 4096-node PULSE architecture allows up to 260k optical channels to be re-used across sub-networks achieving a capacity of 25.6 Pbps with an energy consumption of 82 pJ/bit when using coherent receiver.
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Publication Type: | Journal Article |
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Publication Sub Type: | Article |
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Authors: | Benjamin J, Gerard T, Lavery D, Bayvel P, Zervas G |
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Publisher: | Institute of Electrical and Electronics Engineers |
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Publication date: | 15/09/2020 |
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Pagination: | 4906Ìý- 4921 |
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Journal: | Journal of Lightwave Technology |
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Volume: | 38 |
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Issue: | 18 |
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Status: | PublishedÌý |
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Print ISSN: | 0733-8724 |
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DOI: | |
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Full text URL: | |
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