China
Nonlinear optical fibers are supposed as one of the effective transmission media which can be applied in the optical fiber communication. A Lax-integrable (2+1)-dimensional Kundu-Mukherjee-Naskar equation, which describes the propagation of optical pulses in a nonlinear optical fiber, is investigated in this paper. We first construct the N-fold binary Darboux transformation, where N is a positive integer. Via the obtained Nfold binary Darboux transformation, we derive the N-soliton solutions and perform the asymptotic analysis on the obtained N-soliton solutions. The N-soliton solutions can be decomposed into N one-soliton solutions with different velocities as y → ±∞, where y is a spatial variable. Before and after each interaction, the N solitons pass through each other without any change in shape, velocity, while only encounter the phase shifts. Taking N = 2 and N = 3 as two examples, we graphically illustrate the 2 and 3 interacting solitons through the 3D plots and density plots, which align with our asymptotic-analysis results. Our results might help people understand some localized waves in nonlinear optical fibers.
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