Open AccessRoll-off factor dependence of Nyquist pulse transmission
Author(s) -
Koudai Harako,
Daiki Suzuki,
Toshihiko Hirooka,
Makoto Nakazawa
Publication year - 2016
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.021986
Subject(s) - optics , nyquist–shannon sampling theorem , polarization mode dispersion , physics , dispersion (optics) , pulse shaping , transmission (telecommunications) , nyquist frequency , polarization (electrochemistry) , nonlinear system , pulse (music) , spectral density , telecommunications , bandwidth (computing) , mathematics , computer science , mathematical analysis , laser , chemistry , quantum mechanics , detector
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.