February 13, 2016 Conference paper Open Access

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

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  <identifier identifierType="URL">https://zenodo.org/record/204084</identifier>
  <creators>
    <creator>
      <creatorName>Bakopoulos, Paraskevas</creatorName>
      <givenName>Paraskevas</givenName>
      <familyName>Bakopoulos</familyName>
      <affiliation>aPhotonics Communications Research Laboratory, National Technical University of Athens</affiliation>
    </creator>
    <creator>
      <creatorName>Dris, Stefanos</creatorName>
      <givenName>Stefanos</givenName>
      <familyName>Dris</familyName>
      <affiliation>aPhotonics Communications Research Laboratory, National Technical University of Athens</affiliation>
    </creator>
    <creator>
      <creatorName>Argyris, Nikolaos</creatorName>
      <givenName>Nikolaos</givenName>
      <familyName>Argyris</familyName>
      <affiliation>aPhotonics Communications Research Laboratory, National Technical University of Athens</affiliation>
    </creator>
    <creator>
      <creatorName>Spatharakis, Christos</creatorName>
      <givenName>Christos</givenName>
      <familyName>Spatharakis</familyName>
      <affiliation>aPhotonics Communications Research Laboratory, National Technical University of Athens</affiliation>
    </creator>
    <creator>
      <creatorName>Avramopoulos, Hercules</creatorName>
      <givenName>Hercules</givenName>
      <familyName>Avramopoulos</familyName>
      <affiliation>aPhotonics Communications Research Laboratory, National Technical University of Athens</affiliation>
    </creator>
  </creators>
  <titles>
    <title>112 Gb/s sub-cycle 16-QAM Nyquist-SCM for intra-datacenter connectivity</title>
  </titles>
  <publisher>Zenodo</publisher>
  <publicationYear>2016</publicationYear>
  <subjects>
    <subject>Optical Interconnects, sub-carrier modulation, 16-QAM, Nyquist pulse shaping, intra-datacenter connectivity, direct detection, digital equalization</subject>
  </subjects>
  <dates>
    <date dateType="Issued">2016-02-13</date>
  </dates>
  <resourceType resourceTypeGeneral="ConferencePaper"/>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://zenodo.org/record/204084</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1117/12.2211639</relatedIdentifier>
    <relatedIdentifier relatedIdentifierType="URL" relationType="IsPartOf">https://zenodo.org/communities/ecfunded</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="https://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;Datacenter traffic is exploding. Ongoing advancements in network infrastructure that ride on Moore’s law are unable to&lt;br&gt;
keep up, necessitating the introduction of multiplexing and advanced modulation formats for optical interconnects in order&lt;br&gt;
to overcome bandwidth limitations, and scale lane speeds with energy- and cost-efficiency to 100 Gb/s and beyond. While&lt;br&gt;
the jury is still out as to how this will be achieved, schemes relying on intensity modulation with direct detection (IM/DD)&lt;br&gt;
are regarded as particularly attractive, due to their inherent implementation simplicity. Moreover, the scaling-out of&lt;br&gt;
datacenters calls for longer transmission reach exceeding 300 m, requiring single-mode solutions.&lt;br&gt;
In this work we advocate using 16-QAM sub-cycle Nyquist-SCM as a simpler alternative to discrete multitone (DMT),&lt;br&gt;
but which is still more bandwidth-efficient than PAM-4. The proposed optical interconnect is demonstrated at 112 Gb/s,&lt;br&gt;
which, to the best of our knowledge, is the highest rate achieved in a single-polarization implementation of SCM. Off-theshelf&lt;br&gt;
components are used: A DFB laser, a 24.3 GHz electro-absorption modulator (EAM) and a limiting photoreceiver,&lt;br&gt;
combined with equalization through digital signal processing (DSP) at the receiver. The EAM is driven by a low-swing&lt;br&gt;
(&amp;lt;1 V) arbitrary waveform generator (AWG), which produces a 28 Gbaud 16-QAM electrical signal with carrier frequency&lt;br&gt;
at ~15 GHz. Tight spectral shaping is leveraged as a means of maintaining signal fidelity when using low-bandwidth&lt;br&gt;
electro-optic components; matched root-raised-cosine transmit and receive filters with 0.1 excess bandwidth are thus&lt;br&gt;
employed. Performance is assessed through transmission experiments over 1250 m and 2000 m of SMF.&lt;/p&gt;</description>
  </descriptions>
  <fundingReferences>
    <fundingReference>
      <funderName>European Commission</funderName>
      <funderIdentifier funderIdentifierType="Crossref Funder ID">10.13039/100010661</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>
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