Conference paper Open Access

112 Gb/s sub-cycle 16-QAM Nyquist-SCM for intra-datacenter connectivity

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


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    <subfield code="a">Optical Interconnects, sub-carrier modulation, 16-QAM, Nyquist pulse shaping, intra-datacenter connectivity, direct detection, digital equalization</subfield>
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  <controlfield tag="001">204084</controlfield>
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    <subfield code="d">March 7, 2016</subfield>
    <subfield code="a">Proc. SPIE 9775, Next-Generation Optical Networks for Data Centers and Short-Reach Links III, 97750A</subfield>
    <subfield code="c">San Francisco, California, United States</subfield>
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    <subfield code="u">aPhotonics Communications Research Laboratory, National Technical University of Athens</subfield>
    <subfield code="a">Dris, Stefanos</subfield>
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    <subfield code="u">aPhotonics Communications Research Laboratory, National Technical University of Athens</subfield>
    <subfield code="a">Argyris, Nikolaos</subfield>
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    <subfield code="u">aPhotonics Communications Research Laboratory, National Technical University of Athens</subfield>
    <subfield code="a">Spatharakis, Christos</subfield>
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    <subfield code="u">aPhotonics Communications Research Laboratory, National Technical University of Athens</subfield>
    <subfield code="a">Avramopoulos, Hercules</subfield>
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    <subfield code="u">https://zenodo.org/record/204084/files/SPIE_sub-cycle_final.pdf</subfield>
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    <subfield code="c">2016-02-13</subfield>
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    <subfield code="u">aPhotonics Communications Research Laboratory, National Technical University of Athens</subfield>
    <subfield code="a">Bakopoulos, Paraskevas</subfield>
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    <subfield code="a">112 Gb/s sub-cycle 16-QAM Nyquist-SCM for intra-datacenter connectivity</subfield>
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  <datafield tag="536" ind1=" " ind2=" ">
    <subfield code="c">645212</subfield>
    <subfield code="a">eNd to End scalable and dynamically reconfigurable oPtical arcHitecture for application-awarE SDN cLoud datacentErs</subfield>
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    <subfield code="a">Creative Commons Attribution 4.0 International</subfield>
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    <subfield code="a">&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;</subfield>
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    <subfield code="a">10.1117/12.2211639</subfield>
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