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In this paper, we numerically investigate the process of beam self-cleaningin a graded-index multimode optical fiber, by using the coupled-mode model. Weintroduce various models of random linear coupling between spatial modes,including coupling between all modes, or only between degenerate ones, andinvestigate the effects of random mode coupling on the beam self-cleaningprocess. The results of numerical investigations are in complete agreement withour experimental data.

Random Mode Coupling Assists Kerr Beam Self-Cleaning in a Graded-Index Multimode Optical Fiber