  We report an industry leading optical dense wavelength division multiplexing
(DWDM) field trial with line rates per channel exceeding 1.66 Tb/s using 130
GBaud dual-polarization probabilistic constellation shaping 256-ary quadrature
amplitude modulation (DP-PCS256QAM) in a high capacity data center interconnect
(DCI) scenario. This research trial was performed on 96.5 km of field-deployed
standard single mode G.652 fiber infrastructure of Deutsche Telekom in Germany
employing Erbium-doped fiber amplifier (EDFA)-only amplification. A total of 34
channels were transmitted with 150 GHz spacing for a total fiber capacity of
56.51 Tb/s and a spectral efficiency higher than 11bit/s/Hz. In the
single-channel transmission scenario 1.71 Tb/s was achieved over the same link.
In addition, we successfully demonstrate record net bitrates of 1.88 Tb/s in
back-to-back (B2B) using 130 GBaud DP-PCS400QAM.
