  We have theoretically studied the scattering of two-photon pulses from a
spatially-separated array of two-level atoms coupled to the waveguide. A
general analytical expression for the scattered pulse has been obtained. The
contributions of various single-eigenstate and double-excited eigenstates of
the array have been analyzed. We have also calculated the dependence of the
time incident photons are stored in the array on its period and the number of
atoms. The largest storage times correspond to the structures with the
anti-Bragg period, equal to the quarter of the wavelength of light at the atom
resonance frequency $\lambda/4$.
