Instabilities, solitons and rogue waves in PT-coupled nonlinear waveguides

• Autor(a) principal: Bludov, Yuliy V.
• Data de Publicação: 2013
• Outros Autores: Driben, R., Konotop, Vladimir V., Malomed, B. A.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/1822/27114
• topic: Parity–time symmetry; Instabilities; Rogue wave; Nonlinear schrödinger equation; nonlinear Schrodinger equation; Science & Technology

We considered the modulational instability of continuous-wave backgrounds, and the related generation and evolution of deterministic rogue waves in the recently introduced parity–time (PT )-symmetric system of linearly coupled nonlinear Schr¨ odinger equations, which describes a Kerr-nonlinear optical coupler with mutually balanced gain and loss in its cores. Besides the linear coupling, the overlapping cores are coupled through the cross-phase-modulation term too. While the rogue waves, built according to the pattern of the Peregrine soliton, are (quite naturally) unstable, we demonstrate that the focusing cross-phase-modulation interaction results in their partial stabilization. For PT -symmetric and antisymmetric bright solitons, the stability region is found too, in an exact analytical form, and verified by means of direct simulations.