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12.1 terabit/second data center interconnects using O-band coherent transmission with QD-MLL frequency combs

Author

Listed:
  • Santiago Bernal

    (McGill University)

  • Mario Dumont

    (University of California)

  • Essam Berikaa

    (McGill University)

  • Charles St-Arnault

    (McGill University)

  • Yixiang Hu

    (McGill University)

  • Ramon Gutierrez Castrejon

    (McGill University
    Univ. Nacional Autónoma de México UNAM, Cd. Uni.)

  • Weijia Li

    (McGill University)

  • Zixian Wei

    (McGill University)

  • Benjamin Krueger

    (Keysight Technologies Deutschland GmbH)

  • Fabio Pittalà

    (Keysight Technologies Deutschland GmbH)

  • John Bowers

    (University of California)

  • David V. Plant

    (McGill University)

Abstract

Most current Data Center Interconnects (DCI) use intensity modulation direct detection (IMDD) configurations due to their low complexity and cost. However, significant scaling challenges allow coherent solutions to become contenders in these short reach applications. We present an O-band coherent optical fiber transmission system based on Quantum Dot—Mode Locked Lasers (QD-MLLs) using two independent free-running comb lasers, one each for the carrier and the Local Oscillator (LO). Using a comb-to-comb configuration, we demonstrate a 10 km single mode fiber, O-band, coherent, heterodyne, 12.1 Tbps system operating at 0.47 Tbps/λ using 26 λs. We used fewer comb lines (26 λs), faster symbol rate (56 GBaud) and higher constellation cardinality (32 QAM) relative to the highest capacity C-band systems reported to date. Through design, analysis, and experimentation, we quantify the optimum comb line spacing for this use case. We compare potential configurations for increasing data center interconnect capacities whilst reducing power consumption, complexity, and cost.

Suggested Citation

  • Santiago Bernal & Mario Dumont & Essam Berikaa & Charles St-Arnault & Yixiang Hu & Ramon Gutierrez Castrejon & Weijia Li & Zixian Wei & Benjamin Krueger & Fabio Pittalà & John Bowers & David V. Plant, 2024. "12.1 terabit/second data center interconnects using O-band coherent transmission with QD-MLL frequency combs," Nature Communications, Nature, vol. 15(1), pages 1-15, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-51682-2
    DOI: 10.1038/s41467-024-51682-2
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