  We consider the coupled electromagnetic waves propagating in a waveguide
array, which consists of alternating waveguides of positive and negative
refraction indexes. Due to zigzag configuration there are interactions between
both nearest and next nearest neighboring waveguides exist. It is shown that
there is a stop band in the spectrum of linear waves. The system of evolution
equations for coupled waves has the steady state solution describing the
electromagnetic pulse running in the array. Numerical simulation demonstrates
robustness of these solitary waves.
