Experimental Demonstration of 112-Gbit/s PAM-4 over up to 80 km SSMF at 1550 nm for Inter-DCI Applications

We experimentally demonstrate 112-Gbit/s PAM-4 over 80 km SSMF at 1550 nm. It is shown, that a channel shortening filter (CSF) matched to the memory of a subsequent MLSE significantly improves the performance while keeping complexity manageable.