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Inter-modal nonlinear interference in SDM systems and its impact on information capacity

We present a fully analytic study of the nonlinear interference noise (NLIN) in SDM systems. Our approach is based on the generalization to the case of mode-multiplexed systems of tools that have been recently developed for the study of the NLIN in standard single-mode systems. The presented model is shown to yield simple expressions relating the NLIN power and the information capacity to the number of propagating modes.