Conference paper Open Access

Scaling single-wavelength optical interconnects to 180 Gb/s with PAM-M and pulse shaping

Stefanos Dris; Paraskevas Bakopoulos; Nikolaos Argyris; Christos Spatharakis; Hercules Avramopoulos


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  <identifier identifierType="DOI">10.5281/zenodo.290544</identifier>
  <creators>
    <creator>
      <creatorName>Stefanos Dris</creatorName>
      <affiliation>Photonics Communications Research Laboratory, National Technical University of Athens</affiliation>
    </creator>
    <creator>
      <creatorName>Paraskevas Bakopoulos</creatorName>
      <affiliation>Photonics Communications Research Laboratory, National Technical University of Athens</affiliation>
    </creator>
    <creator>
      <creatorName>Nikolaos Argyris</creatorName>
      <affiliation>Photonics Communications Research Laboratory, National Technical University of Athens</affiliation>
    </creator>
    <creator>
      <creatorName>Christos Spatharakis</creatorName>
      <affiliation>Photonics Communications Research Laboratory, National Technical University of Athens</affiliation>
    </creator>
    <creator>
      <creatorName>Hercules Avramopoulos</creatorName>
      <affiliation>Photonics Communications Research Laboratory, National Technical University of Athens</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Scaling single-wavelength optical interconnects to 180 Gb/s with PAM-M and pulse shaping</title>
  </titles>
  <publisher>Zenodo</publisher>
  <publicationYear>2016</publicationYear>
  <dates>
    <date dateType="Issued">2016-03-07</date>
  </dates>
  <resourceType resourceTypeGeneral="Text">Conference paper</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://zenodo.org/record/290544</alternateIdentifier>
  </alternateIdentifiers>
  <rightsList>
    <rights rightsURI="http://creativecommons.org/licenses/by/4.0/legalcode">Creative Commons Attribution 4.0 International</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">&lt;p&gt;Faced with surging datacenter traffic demand, system designers are turning to multi-level optical modulation with direct detection as the means of reaching 100 Gb/s in a single optical lane; a further upgrade to 400 Gb/s is envisaged through wavelength-multiplexing of multiple 100 Gb/s strands. In terms of modulation formats, PAM-4 and PAM-8 are considered the front-runners, striking a good balance between bandwidth-efficiency and implementation complexity. In addition, the emergence of energy-efficient, high-speed CMOS digital-to-analog converters (DACs) opens up new possibilities: Spectral shaping through digital filtering will allow squeezing even more data through low-cost, low-bandwidth electro-optic components. In this work we demonstrate an optical interconnect based on an EAM that is driven directly with sub-volt electrical swing by a 65 GSa/s arbitrary waveform generator (AWG). Low-voltage drive is particularly attractive since it allows direct interfacing with the switch/server ASIC, eliminating the need for dedicated, power-hungry and expensive electrical drivers. Single-wavelength throughputs of 180 and 120 Gb/s are experimentally demonstrated with 60 Gbaud optical PAM-8 and PAM-4 respectively. Successful transmission over 1250 m SMF is achieved with direct-detection, using linear equalization via offline digital signal processing in order to overcome the strong bandwidth limitation of the overall link (~20 GHz). The suitability of Nyquist pulse shaping for optical interconnects is also investigated experimentally with PAM-4 and PAM-8, at a lower symbol rate of 40 Gbaud (limited by the sampling rate of the AWG). To the best of our knowledge, the rates achieved are the highest ever using optical PAM-M formats.&lt;/p&gt;</description>
  </descriptions>
  <fundingReferences>
    <fundingReference>
      <funderName>European Commission</funderName>
      <funderIdentifier funderIdentifierType="Crossref Funder ID">10.13039/501100000780</funderIdentifier>
      <awardNumber awardURI="info:eu-repo/grantAgreement/EC/H2020/645212/">645212</awardNumber>
      <awardTitle>eNd to End scalable and dynamically reconfigurable oPtical arcHitecture for application-awarE SDN cLoud datacentErs</awardTitle>
    </fundingReference>
  </fundingReferences>
</resource>
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