February 13, 2016 Conference paper Open Access

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

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{
  "DOI": "10.1117/12.2211639", 
  "title": "112 Gb/s sub-cycle 16-QAM Nyquist-SCM for intra-datacenter connectivity", 
  "issued": {
    "date-parts": [
      [
        2016, 
        2, 
        13
      ]
    ]
  }, 
  "abstract": "<p>Datacenter traffic is exploding. Ongoing advancements in network infrastructure that ride on Moore\u2019s law are unable to<br>\nkeep up, necessitating the introduction of multiplexing and advanced modulation formats for optical interconnects in order<br>\nto overcome bandwidth limitations, and scale lane speeds with energy- and cost-efficiency to 100 Gb/s and beyond. While<br>\nthe jury is still out as to how this will be achieved, schemes relying on intensity modulation with direct detection (IM/DD)<br>\nare regarded as particularly attractive, due to their inherent implementation simplicity. Moreover, the scaling-out of<br>\ndatacenters calls for longer transmission reach exceeding 300 m, requiring single-mode solutions.<br>\nIn this work we advocate using 16-QAM sub-cycle Nyquist-SCM as a simpler alternative to discrete multitone (DMT),<br>\nbut which is still more bandwidth-efficient than PAM-4. The proposed optical interconnect is demonstrated at 112 Gb/s,<br>\nwhich, to the best of our knowledge, is the highest rate achieved in a single-polarization implementation of SCM. Off-theshelf<br>\ncomponents are used: A DFB laser, a 24.3 GHz electro-absorption modulator (EAM) and a limiting photoreceiver,<br>\ncombined with equalization through digital signal processing (DSP) at the receiver. The EAM is driven by a low-swing<br>\n(&lt;1 V) arbitrary waveform generator (AWG), which produces a 28 Gbaud 16-QAM electrical signal with carrier frequency<br>\nat ~15 GHz. Tight spectral shaping is leveraged as a means of maintaining signal fidelity when using low-bandwidth<br>\nelectro-optic components; matched root-raised-cosine transmit and receive filters with 0.1 excess bandwidth are thus<br>\nemployed. Performance is assessed through transmission experiments over 1250 m and 2000 m of SMF.</p>", 
  "author": [
    {
      "family": "Bakopoulos, Paraskevas"
    }, 
    {
      "family": "Dris, Stefanos"
    }, 
    {
      "family": "Argyris, Nikolaos"
    }, 
    {
      "family": "Spatharakis, Christos"
    }, 
    {
      "family": "Avramopoulos, Hercules"
    }
  ], 
  "id": "204084", 
  "event-place": "San Francisco, California, United States", 
  "type": "paper-conference", 
  "event": "Proc. SPIE 9775, Next-Generation Optical Networks for Data Centers and Short-Reach Links III, 97750A"
}