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We investigate experimentally and theoretically effects of the inter-corepropagation mismatch on nonlinear switching in dual-core high-index-contrastsoft-glass optical fibers. Incident femtosecond pulses of various energy arefed into a single ("straight") core, to identify transitions between differentdynamical regimes, viz., inter-core oscillations, self-trapping in the crosscore, and retaining the pulse in the straight core. The transfer betweenchannels, which has solitonic character, is controlled by the pulse's energy. Amodel based on the system of coupled nonlinear Schr\"{o}dinger equationsreveals the effect of the mismatch parameter and pulse duration on the diagramof the various energy dependent dynamical regimes. Optimal values of themismatch and pulse width, which ensure stable performance of the nonlinearswitching, are identified. The theoretical predictions are in agreement withexperimental findings.

Self-trapping and switching of solitonic pulses in mismatched dual-core highly nonlinear fibers