Generation of solitary waves from continuous radiation in a nonlinear oppositely directed coupler

We consider a nonlinear coupler formed by two tunnelcoupled waveguides, one waveguide being made of a conventional dielectric and the other – of a negative-index material. The possibility of the formation of solitary waves from continuous radiation having a constant intensity is shown provided that the radiation is coupled into the input of a negative-index coupler channel (on the back side of the waveguide system). With increasing intensity of the input light, the speed and amplitude of the generated solitary waves increase and the period of their formation is reduced.