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Nonlinear waves in deformed optical honeycomb lattices are investigated. Discrete couple mode equations are used to find higher order continuous nonlinear Dirac systems which are employed to describe key underlying phenomena. For weak deformation and nonlinearity the wave propagation is circular–ellliptical. At strong nonlinearity the diffraction pattern becomes triangular in structure which is traced to appropriate nonequal energy propagation in momentum space. At suitably large deformation the dispersion structure can have nearby Dirac points or small gaps. The effective dynamics of the wave packets is described by two maximally balanced nonlocal nonlinear Schrödinger type equations.

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On voit done que la condition nécessaire pour que les séries (2) puissent représenter les intégrales générales du système d'équations différentielles (1), n'est remplie que si les constantes$A, B, C, x$_{0},$y$_{0},$z$_{0}satisfont à l'une des quatre conditions suivantes:(1) $$A = B = C,$$ (2) $$x_0 = y_0 = z_0 = o,$$ (3) $$A = B, x_0 = y_0 = o,$$ (4) $$A = B = 2C, z_0 = o.$$

No abstract uploaded!