Evaluation of Real-Time 8 x 56.25 Gb/s (400G) PAM-4 for Inter-Data Center Application Over 80 km of SSMF at 1550 nm

Nicklas Eiselt, Jinlong Wei, Helmut Griesser, Annika Dochhan, Michael H. Eiselt, Jörg-Peter Elbers, Juan José Vegas Olmos, Idelfonso Tafur Monroy

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Leveraging client optics based on intensity modulation and direct detection for point-to-point inter-data center interconnect applications is a cost and power efficient solution, but challenging in terms of optical signal-to-noise ratio requirements and chromatic dispersion tolerance. In this paper, real-time 8 x 28.125 GBd dense wavelength division multiplexing four-level pulse amplitude modulation (PAM-4) transmission over up to 80 km standard single mode fiber in the C-Band is demonstrated. Using a combination of optical dispersion compensation and electronic equalization, results below a bit error rate of 1e-6 are achieved and indicate sufficient margin to transmit over even longer distances, if an forward error correction (FEC) threshold of 3.8e-3 is assumed. Moreover, single channel 28.125 GBd PAM4 is evaluated against optical effects such as optical bandwidth limitations, chromatic dispersion tolerance, and optical amplified spontaneous emission noise.
Original languageEnglish
JournalJournal of Lightwave Technology
Issue number4
Pages (from-to)955-962
Publication statusPublished - 2017


  • Optical fibers
  • Optical noise
  • Optical signal processing
  • Optical receivers
  • Optical fiber sensors
  • pulse amplitude modulation
  • DWDM transmission
  • modulation
  • optical fiber communication


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