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Passive Optical Interconnects Based on Cascading Wavelength Routing Devices for Datacenters: A Cross-Layer Perspective
KTH. South China Normal University, China.
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab). South China Normal University, China.
2017 (English)In: Journal of Optical Communications and Networking, ISSN 1943-0620, E-ISSN 1943-0639, Vol. 9, no 4, C45-C53 p.Article in journal (Refereed) Published
Abstract [en]

A general passive optical interconnect (POI) architecture based on cascading wavelength routing devices is proposed for datacenters. An analysis shows that with a proper port configuration, the logic topology of the proposed POI is equivalent to a DCell network, which has rich connectivity, leading to a high fault tolerance. Compared with the existing arrayed waveguide grating (AWG)-based architecture, such as H-LION, the proposed architecture has a higher AWG port utilization and lower cabling complexity that result in better scalability. Meanwhile, an impairment-aware scalability analysis is carried out to estimate the impact of in-band crosstalk on the size of the POI. Furthermore, a cross-layer investigation of the proposed POI provides a guideline to select proper physical-layer implementations, including optical interface structure and design of the transceiver, for acceptable network performance. The numerical results reveal that, with a moderate number of shortest paths K and degrees of node D, (a) the bidirectional optical interface is more suitable for large-scale datacenter networks than the unidirectional one, (b) an array of fixed receivers can be replaced by just a small number of tunable receivers with negligible degradation in network performance, and (c) decreasing 50% of the tuning range of the receivers causes only a minor increase of blocking probability, which demonstrates a good balance between the complexity of the transceiver design and network performance.

Place, publisher, year, edition, pages
Optical Society of America, 2017. Vol. 9, no 4, C45-C53 p.
Keyword [en]
Cross-layer, DCell network, Passive optical interconnects, Wavelength routing
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:kth:diva-208862DOI: 10.1364/JOCN.9.000C45ISI: 000401370200007ScopusID: 2-s2.0-85017387209OAI: oai:DiVA.org:kth-208862DiVA: diva2:1109362
Funder
Swedish Foundation for Strategic Research Swedish Research Council
Note

QC 20170614

Available from: 2017-06-14 Created: 2017-06-14 Last updated: 2017-06-14Bibliographically approved

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CiteExportLink to record
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