Transmission of twenty-two 1Tb/s quad-carriers PDM QAM16 channels over 2400km

We report the WDM transmission of 22x1-Tb/s quad-carrier channels using 16QAM format over ultra-long distance. With a spectral efficiency of 5-b/s/Hz, this result represents a record capacity-bandwidth product for 16QAM of 52.8 Pb/s·km. OCIS codes: (060.1660) Coherent communications; (060.4080) Modulation