400 Gbps real-time coherent Nyquist-WDM DP-16QAM transmission over legacy G.652 or G.655 fibre infrastructure with 2 dB margins

We experimentally demonstrate uncompensated error-free transmission of 400 Gbps real-time coherent DP-16QAM with Nyquist filtering (5.33 bit/s/Hz) over 500 km (resp. 300 km) of G.652 (resp. G.655) fibre using purely EDFA amplification and taking into account 2 dB margins.