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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    <dct:title>112 Gb/s sub-cycle 16-QAM Nyquist-SCM for intra-datacenter connectivity</dct:title>
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    <dcat:keyword>Optical Interconnects, sub-carrier modulation, 16-QAM, Nyquist pulse shaping, intra-datacenter connectivity, direct detection, digital equalization</dcat:keyword>
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    <dct:description>&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;</dct:description>
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    <dct:title>eNd to End scalable and dynamically reconfigurable oPtical arcHitecture for application-awarE SDN cLoud datacentErs</dct:title>
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