Soliton dynamicsin amedium with a cascade nonlinearity in the presence of a local modulation nonlinearity coefficient in the form of two parallel defects wasstudied. The conditions under which there may be a regimeof soliton refraction by defects and regimeof soliton trappingby a particular channelwereinvestigated. It was shown that the soliton trapping depends on the soliton parameters (amplitude, the angle of incidence on defect), and the parameters of defects (nonlinearity coefficient of the modulation depth, shape)
42.65.Jx Beam trapping, self-focusing and defocusing; self-phase modulation
42.65.Wi Nonlinear waveguides
$^1$ Lomonosov Moscow State University,Faculty of Physics, Photonics and Microwave Physics Department. Moscow 119991,Russia
$^2$ Russian Quantum Center. Skolkovo village, Moscow region 143025, Russia.