title: Achievable information rates estimates in optically amplified transmission systems using nonlinearity compensation and probabilistic shaping.
abstract: Achievable information rates (AIRs) of wideband optical communication systems using a ∼40  nm (∼5  THz) erbium-doped fiber amplifier and ∼100  nm (∼12.5  THz) distributed Raman amplification are estimated based on a first-order perturbation analysis. The AIRs of each individual channel have been evaluated for DP-64QAM, DP-256QAM, and DP-1024QAM modulation formats. The impact of full-field nonlinear compensation (FF-NLC) and probabilistically shaped constellations using a Maxwell-Boltzmann distribution were studied and compared to electronic dispersion compensation. It has been found that a probabilistically shaped DP-1024QAM constellation, combined with FF-NLC, yields achievable information rates of ∼75  Tbit/s for the EDFA scheme and ∼223  Tbit/s for the Raman amplification scheme over a 2000 km standard single-mode fiber transmission.
authors.forename: Daniel
authors.initials: D
authors.lastname: Semrau
authors.forename: Tianhua
authors.initials: T
authors.lastname: Xu
authors.forename: Nikita A
authors.initials: NA
authors.lastname: Shevchenko
authors.forename: Milen
authors.initials: M
authors.lastname: Paskov
authors.forename: Alex
authors.initials: A
authors.lastname: Alvarado
authors.forename: Robert I
authors.initials: RI
authors.lastname: Killey
authors.forename: Polina
authors.initials: P
authors.lastname: Bayvel