Reach extension of PAM4 signals in O-band transmission by application of alternate-mark-inversion
Natsupa Taengnoi, Kyle R. H. Bottrill, Yang Hong, Naresh Kumar Thipparapu, Cosimo Lacava, Jayanta Kumar Sahu, David John Richardson, Periklis Petropoulos · 2019
We improve the tolerance of O-band PAM4 transmission to nonlinearity by adopting an alternate-mark-inversion scheme. Improvements in receiver sensitivity are shown over both semiconductor optical amplifier and bismuth doped fibre amplifier equipped links, the greatest being a 4.4dB Q-factor improvement over 60km of SMF-28e.