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Trends in High-Speed Interconnects for Datacenter Networking: Multidimensional Formats and Their Enabling DSP

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Optical Switching in Next Generation Data Centers

Abstract

The unprecedented growth in datacenter (DC) traffic, which constitutes the major part of today’s IP traffic, is driving the quest for faster inexpensive short-reach optics to be deployed inside these large warehouse-sized DCs in the so-called intra-DC interconnects over reaches up to 10 km.

A review of multidimensional modulation formats is presented. These formats are capable of providing the required capacity increase compared to legacy on-off keying (OOK) formats and are possibly demodulated by self-beating direct-detection (DD) receivers that are typically cheaper than coherent counterparts relying on a local oscillator (LO). We begin with thorough introduction where we highlight the problem and challenges and review the recent literature of proposed solutions. This is followed by introducing the needed background where the representation of a lightwave and polarization rotation in Stokes space are reviewed. Then, we present the evolution of the multidimensional modulation formats depicting the architectures of their respective transmitters and receivers. Next, we describe briefly the digital signal processing (DSP) functions that enable modulation and direct detection of all dimensions in the presence of polarization rotation that occurs along the fiber. Then, the key achievements that have been recently reported using multidimensional formats are summarized. We finally conclude and point out potential research directions.

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Authors and Affiliations

  1. Department of Electrical & Computer Engineering, McGill University, Montréal, QC, H3A 2A7, Canada

    David V. Plant, Mohamed H. Morsy-Osman & Mathieu Chagnon

  2. Ericsson Research, 8275 Route Transcanadienne, Saint-Laurent, QC, H4S 0B6, Canada

    Stephane Lessard

Authors
  1. David V. Plant
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  2. Mohamed H. Morsy-Osman
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  3. Mathieu Chagnon
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  4. Stephane Lessard
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Corresponding author

Correspondence to David V. Plant .

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Editors and Affiliations

  1. Ericsson Research, Pisa, Italy

    Francesco Testa

  2. Department of Physics, Nanoscience Lab, University of Trento, Povo, Trento, Italy

    Lorenzo Pavesi

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Plant, D.V., Morsy-Osman, M.H., Chagnon, M., Lessard, S. (2018). Trends in High-Speed Interconnects for Datacenter Networking: Multidimensional Formats and Their Enabling DSP. In: Testa, F., Pavesi, L. (eds) Optical Switching in Next Generation Data Centers. Springer, Cham. https://doi.org/10.1007/978-3-319-61052-8_13

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  • DOI: https://doi.org/10.1007/978-3-319-61052-8_13

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-61051-1

  • Online ISBN: 978-3-319-61052-8

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