Wireless Networks

, Volume 25, Issue 8, pp 4915–4920 | Cite as

Modulations and fading points

  • Zacharia DamoueEmail author
  • Ahmed Dooguy Kora
  • Samuel Ouya
  • Cheikh Brahim Rabany


This document relates to NRZ and QPSK modulation codes or formats that have varying degrees of success in optical links. Indeed, these modulation formats undergo, during their path through the optical media, encounter the following limitations: (1) linear effects (attenuation, chromatic dispersion, polarization mode dispersion), (2) non-linear effects (Kerr, Raman and Brillouin effects). In addition to these limiting factors, the NRZ code in its propagation on the optical links encounters phenomena of fading of the signal as a function of the flow and the range. To reduce these fading phenomena, the QPSK code can be a solution. QPSK code makes it possible to reduce the number of fading points to the third on an optical link using a bit rate ranging from 10 to 30 Gbit s−1.


NRZ and QPSK codes Optical link Fading point 



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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Ecole Supérieure Multinationale des TélécommunicationsDakarSenegal
  2. 2.Université Cheikh Anta DIOP (UCAD)DakarSenegal

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