Achievable Rate Comparison between Probabilistically-Shaped Single-Carrier and Entropy-Loaded Multi-Carrier Signaling in a Bandwidth-Limited 1-Tb/s Coherent System

Multicarrier modulation can use entropy loading to adapt a frequency-dependent channel. We compare single- and multi-carrier (SC/MC) signaling in a 100-GBaud coherent system whose performance is mainly degraded by the bandwidth-limited transmitter, and reveal an MC advantage of 0.3 bits/symbol or 20-km reach extension over a single-span transmission.