Capacity-approaching transmission over 6375 km at spectral efficiency of 8.3 bit/s/Hz

Transmission capacities of 34.9Tb/s over 6375 km based on Gaussian-like DP-64APSK and 33.3 Tb/s over 6800 km using DP-32QAM are demonstrated using hybrid spans with quasi-single-mode fiber. Nonlinear compensation enables 8.3 b/s/Hz spectral efficiency.