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We study propagation of light in nonlinear diffraction-managed photoniclattices created with arrays of periodically-curved coupled optical waveguideswhich were fabricated using femtosecond laser writing in silica glass, andtitanium indiffusion in LiNbO3 crystals. We identify different regimes of thenonlinear propagation of light beams depending on the input power, and presentthe first experimental observation of diffraction-managed solitons, which areformed as a result of the interplay between the engineered beam diffraction andnonlinear self-focusing or defocusing. We observe that in self-collimatingstructures where linear diffraction is suppressed, a novel regime of nonlinearbeam diffusion takes place at the intermediate powers before the latticesoliton is formed at higher powers.

Diffraction-managed solitons and nonlinear beam diffusion in modulated arrays of optical waveguides