Energy efficiency benefits of introducing optical switching in Data Center Networks

Artur Pilimon, Alexandra Zeimpeki, Anna Manolova Fagertun, Sarah Renée Ruepp

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    In this paper we analyze the impact of WDM-enhanced optical circuit switching on the power consumption of multiple Data Center Network (DCN) architectures. Traditional three-tier Tree, Fat-Tree and a ring-based structure are evaluated and optical switching is selectively introduced on different layers of the network topology. The analysis is based on network-level simulations using a transport network planning tool applied to small-scale setups of the considered DCNs. The obtained results show that introducing all-optical switching within the DCN leads to reduced power consumption in all architectures, except the traditional Tree. This is caused by the inability to perform efficient traffic grooming and smaller average nodal degree of this architecture. Enabling optical switching only at the aggregation layer results in the highest energy savings in Fat-Tree and traditional Tree, while an optically switched core benefits most the ring-based network. For the latter, the core ring nodes need fewer long-reach transponders at the trunk interfaces and benefit from more efficient traffic grooming in the access part.
    Original languageEnglish
    Title of host publicationProceedings of 2017 Workshop on Computing, Networking and Communications
    Publication date2017
    ISBN (Print)9781509045884
    Publication statusPublished - 2017
    Event2017 International Conference on Computing, Networking and Communications - Silicon Valley, United States
    Duration: 26 Jan 201729 Jan 2017


    Conference2017 International Conference on Computing, Networking and Communications
    Country/TerritoryUnited States
    CitySilicon Valley


    • Optical switches
    • Optical fiber networks
    • Optical fibers
    • Computer architecture
    • Optical packet switching
    • Power demand
    • opaque network
    • Data Center Network
    • energy efficiency
    • optical switching
    • Optical Cross Connect


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