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PULSE : Optical Circuit Switched Data Center Architecture Operating at Nanosecond Timescales

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(100 ps), establishing timeslots of O(10 ns). A novel scheduling algorithm that has a clock period of 2.3 ns 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 260 k 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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Judul Seri

JOURNAL OF LIGHTWAVE TECHNOLOGY; Vol.38 No.18 September 15 2020

No. Panggil

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Penerbit

: .,

Deskripsi Fisik

p. 4906 - 4921

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

SCHEDULING
OPTICAL INTERCONNECTIONS
WDM
SDM
CIRCUIT SWITCHING (COMMUNICATION SYSTEMS)
FAST NETWORK RECONFIGURATION
FAST TUNABLE TRANSCEIVERS
STAR COUPLER NETWORK
TDM

Info Detail Spesifik

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Pernyataan Tanggungjawab

Joshua L. Benjamin, Thomas Gerard, Domanic Lavery, Polina Bayvel, Georgios Zervas

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