1.5-Tb/S Guard-Banded Superchannel Transmission Over 56x 100-Km (5600-Km) ULAF Using 30-Gbaud Pilot-Free OFDM-16QAM Signals With 5.75-B/S/Hz Net Spectral Efficiency

doi 10.1364/eceoc.2012.th.3.c.5