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Nonlinear interference models for dual-polarization 4D (DP-4D) modulationhave only been used so far to predict signal-signal nonlinear interference. Weshow that including the signal-noise term in the prediction of the effectivesignal-to-noise ratio in long distance DP-4D transmission improves the accuracyby up to 0.2 dB.

Analytical SNR Prediction in Long-Haul Optical Transmission using General Dual-Polarization 4D Formats