Observation of discrete gap solitons in one-dimensional waveguide arrays with alternating spacings and saturable defocusing nonlinearity

We consider, both experimentally and theoretically, the existence and stability of localized, symmetric, and anti-symmetric gap solitons (GSs) in binary lattices of identical waveguides but with alternating spacings. Furthermore, the properties of surface GSs at the boundary of the lattice are explored. (C) 2012 Optical Society of Americ