12.3-Tb/s C-Band DQPSK Transmission at 3.2 b/s/Hz Spectral Efficiency

We demonstrate record 12.3-Tb/s transmission capacity and record 3.2-b/s/Hz spectral efficiency using polarization multiplexed 85.4-Gb/s RZ-DQPSK at 50-GHz channel spacing in the C band. We transmit 77 WDM channels over 240 km of SSMF.