Reach Extension with Lattice Precoding for Optical PAM Transmission in Data Center Networks

We apply an improved version of Tomlinson-Harashima precoding (THP), called lattice precoding (LP), to intensity modulation & direct detection (IM/DD) in short-reach optical fiber communications for data center network (DCN). We show that LP offers a significant gain greater than 6 dB over conventional methods and reach expansion by up to 21%.