Nonlinear tunneling effect of snakelike self-similar waves in a grating dual-core waveguide amplifier

• Main Authors: Jun-Rong He, Si-Liu Xu, Li Xue
• Format: Article
• Language: English
• Published: Elsevier 2019-12-01
• Series: Results in Physics
• Online Access: http://www.sciencedirect.com/science/article/pii/S2211379719314482

We study on the nonlinear tunneling effect of snakelike self-similar waves of the nonlinear Schrödinger equation with gains in an asymmetric dual-core waveguide amplifier with a long-period grating. Using the self-similar transformation we find the bright and dark snakelike self-similar waves with W-, U-, and bell-shaped profiles. As an application, we investigate the nonlinear tunneling effect of these optical structures under some constraint conditions. The results show that the snakelike self-similar waves can similarly pass through the nonlinear barrier or well and can be effectively controlled by adjusting the source amplitude and the long-period grating. Our results may have potential applications for improving channel capacity in the graded-index dual-core waveguide amplifiers with a long-period grating. Keywords: Nonlinear tunneling effect, Snakelike self-similar waves, Asymmetric dual-core waveguide amplifier