Journal
PHYSICS LETTERS A
Volume 384, Issue 25, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physleta.2020.126625
Keywords
Unidirectional flow; Solitons; Waveguides; Cubic nonlinearity
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Funding
- King Fahd University of Petroleum and Minerals (KFUPM) [RG181001]
- UAE University [UPAR4]
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We propose a mechanism for realising a unidirectional flow of discrete solitons in optical waveguide arrays. Modulating the nonlinear interaction strength in each waveguide according to a double reflectionless potential well with slight difference in the depths of its two wells, we achieve a unidirectional flow of the soliton propagation. We verify clearly, through the transport coefficients as in terms of the speed of the incident soliton, that an incident soliton velocity window of finite width exists where unidirectional flow can be realised. We discuss the physics underlying this behaviour on the basis of energy exchange between the soliton's kinetic and interaction energies. (C) 2020 Elsevier B.V. All rights reserved.
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