64-Tb/s (640×107-Gb/s) PDM-36QAM transmission over 320km using both pre- and post-transmission digital equalization

Abstract

Employing raised-cosine pulse-shaped PDM-36QAM modulation and both pre- and post-transmission digital equalization, we demonstrate 12.5GHz-spaced, 640×107Gbits/s DWDM transmission over 4×80km of ultra-large-area fiber with a record capacity of 64Tb/s at 8b/s/Hz spectral efficiency.