  The special symmetry properties of the discrete nonlinear Schrodinger
equation allow a complete revival of the initial wavefunction. That is employed
in the context of stationary propagation of light in a waveguide array. As an
inverting system we propose a short array of almost isolated waveguides which
cause a relative pi phase shift in the neighboring waveguides. By means of
numerical simulations of the model equations we demonstrate a novel mechanism
for the negative refraction of spatial solitons.
