Ultrahigh-Spectral-Efficiency WDM/SDM Transmission Using PDM-1024-QAM Probabilistic Shaping With Adaptive Rate

Hao Hu* (Invited author), Metodi Plamenov Yankov (Invited author), Francesco Da Ros (Invited author), Yoshimichi Amma (Invited author), Yusuke Sasaki (Invited author), Takayuki Mizuno (Invited author), Yutaka Miyamoto (Invited author), Michael Galili (Invited author), Søren Forchhammer (Invited author), Leif Katsuo Oxenløwe (Invited author), Toshio Morioka (Invited author)

*Corresponding author for this work

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We demonstrate wavelength-division-multiplexed (WDM) and space-division-multiplexed (SDM) transmission of probabilistically shaped polarization-division-multiplexed (PDM) 1024-state quadrature amplitude modulation (QAM) channels over a 9.7-km single-mode 30-core fiber, achieving aggregated spectral efficiency of 297.82 bit/s/Hz on a 12.5-GHz grid and 7.01-Tbit/s spatial-super-channel on a 25-GHz grid without multiple-input multiple-output (MIMO) processing. Actual soft-decision forward error correction (SD-FEC) decoding was employed to obtain error-free performance, and adaptive rates and spectral efficiencies for individualWDM/SDM channels have been applied according to their channel conditions, by adjusting the SD-FEC overhead without changing the modulation format. Probabilistically shaped PDM-1024-QAM has been used to further increase the aggregated achievable rate due to the added performance improvement through shaping gain.
Original languageEnglish
JournalJournal of Lightwave Technology
Issue number6
Pages (from-to)1304-1308
Publication statusPublished - 2018


  • 1024-state quadrature amplitude modulation (1024-QAM)
  • Adaptive rate
  • Forward error correction (FEC)
  • Optical fiber communication
  • Probabilistic Shaping
  • Space division multiplexing (SDM)
  • Spectral efficiency
  • Wavelength division multiplexing (WDM)


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