Terabit/s Nyquist superchannels in high capacity fiber field trials using DP-16QAM and DP-8QAM modulation formats

Ming Fang Huang, Akihiro Tanaka, Ezra Ip, Yue Kai Huang, Dayou Qian, Yequn Zhang, Shaoliang Zhang, Philip N. Ji, Ivan B. Djordjevic, Ting Wang, Yoshiaki Aono, Shuji Murakami, Tsutomu Tajima, Tiejun J. Xia, Glenn A. Wellbrock

Research output: Contribution to journalArticlepeer-review

62 Scopus citations


We report the results of two field trials aimed at achieving high fiber capacity over regional and long-haul distances. In the first trial, 41 superchannels with digital Nyquist pulse-shaping were generated and tightly packed to fill up both $C$-band and $L$-band. Each subcarrier was modulated with 24.8-Gbaud dual-polarization 16 quadrature amplitude modulation (DP-16QAM) data. The signal carrying net 54.2 Tb/s data was transmitted over 634 km of dispersion uncompensated field-installed standard single mode fiber with the aid of hybrid EDFA and Raman amplification and digital coherent detection. In the second trial for long-haul distances, we extended the transmission distance over 1,822 km. This increase in reach was achieved by reducing the net total capacity to 40.5 Tb/s and modulating the signals with dual-polarization 8 quadrature amplitude modulation (DP-8QAM) Nyquist carrier modulation. A novel rate-adaptive low-density parity-check coding was employed, so that the transmitted channels can exhibit different code rates, adapted by the concatenation of hard-decision and soft-decision forward error correcting codes for enhancing error-correction capability. To the best of our knowledge, we achieved the highest field trial capacity to date at 54.2 Tb/s in regional distances. Furthermore, in long-haul applications, the reported capacity × distance product of 73.79 Pb/s·km is the highest to date.

Original languageEnglish (US)
Article number6595033
Pages (from-to)776-782
Number of pages7
JournalJournal of Lightwave Technology
Issue number4
StatePublished - Feb 15 2014


  • Dual-polarization 16 quadrature amplitude modulation (DP-16QAM)
  • Nyquist superchannel
  • dual-polarization 8 quadrature amplitude modulation (DP-8QAM)

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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