Digital chromatic dispersion pre-management enabled single-lane 112 Gb/s PAM-4 signal transmission over 80 km SSMF

We experimentally demonstrate single-lane 112 Gb/s four-level pulse-amplitude modulation signal transmission over 80 km standard single-mode fiber (SSMF) by digital chromatic dispersion (CD) pre-management. By theoretically investigating the interplay between CD and self-phase modulation (SPM) during the SSMF transmission, we identify that the SPM induced impairment can be optically mitigated by the residual positive CD of the SSMF link. Thanks to the digital CD pre-management for the purpose of both CD compensation and nonlinear impairment mitigation, a simplified Volterra filter equalizer is good enough to achieve bit error rate below the 7% hard-decision forward error correcting threshold. (c) 2018 Optical Society of America