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The recently introduced 4D 64-ary polarisation-ring-switching format isinvestigated in dispersion-managed systems. Numerical simulations show a reachincrease of $25\%$ with respect to PM-8QAM. This gain is achieved from thenonlinear tolerance of the format and a 4D demapper using correlated noiseassumptions.

Four-dimensional polarization-ring-switching for dispersion-managed optical fibre systems