Transmission of 4×28-Gb/s PAM-4 over 160-km single mode fiber using 10G-class DML and photodiode

We have experimentally demonstrated C-band 112-Gb/s (4×28-Gb/s) PAM-4 transmission over 160-km SMF without inline amplifier based on 10G-class DML and photodiode. Delay interferometer and Volterra filtering are applied to compensate both linear and nonlinear distortions.