Topological Filters for Solitons in Coupled Waveguides Networks
  We study the propagation of discrete solitons on chains of coupled optical waveguides where finite networks of waveguides are inserted at some points. By properly selecting the topology of these networks, it is possible to control the transmission of traveling solitons: we show here that inhomogeneous waveguide networks may be used as filters for soliton propagation. Our results provide a first step in the understanding of the interplay/competition between topology and nonlinearity for soliton dynamics in optical fibers. 
R. Burioni, D. Cassi, P. Sodano, A. Trombettoni, A. Vezzani