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We report the suppression of intermodal modulation instability peaks as aconsequence of Kerr induced self beam-cleaning in a 90m long graded-indexmultimode optical fiber under various specific launching conditions. The outputspectrum and the modal beam profiles for three modes (LP01, LP11, and LP21)have been recorded for several values of pump pulse energy. Experimentalfindings establish that the nonlinear coupling among the guided modes leads toreshaping the output speckle pattern into a bell shape or higher-orderspatially clean beam profile as the pump peak power increases, whereas inspectral-domain intermodal modulation instability peaks are observed whoseamplitude increases gradually to its maximum value and beyond certain thresholdpower, the intermodal modulation instability peaks diminish. This suggests thepossibility to generate intermodal modulation instability free broadbandspectra at high pump peak powers.

Competition Between Intermodal Modulation Instability and Kerr Beam Self-cleaning in Graded-index Multimode Fiber