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This work deals with spatial optical solitons in a ID nonlinear photonic crystal holding a periodical photonic network generated by the Dirac function. We consider a periodic optical structure formed by an area of a nonlinear thin film waveguide. A model for propagation of the optical field in nonlinear photonic crystals is built up using the Laplace transform. The nonlinear wave equation is solved and the spatial optical solitons occurring in this propagation are put into evidence. We calculate the axial corrections for the linear transversal modes.