Roll-off factor dependence of Nyquist pulse transmission

Koudai Harako, Daiki Suzuki, Toshihiko Hirooka, Masataka Nakazawa

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


We evaluate the dependence of system performance on the roll-off factor, α, of a Nyquist pulse in a single-channel 1.28 Tbit/s-525 km transmission both experimentally and analytically. Low α values are preferable in terms of spectral efficiency and tolerance to chromatic dispersion and polarization-mode dispersion, while a strong overlap with neighboring symbols results in larger nonlinear impairments. On the other hand, a Nyquist pulse with high α values also suffers from nonlinearity due to higher peak power. As a result, we found experimentally that the optimum α value is 0.4-0.6, which agrees well with the analysis.

Original languageEnglish
Pages (from-to)21986-21994
Number of pages9
JournalOptics Express
Issue number19
Publication statusPublished - 2016 Sept 5

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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