POWER-CONTROLLED BEAM-STEERING IN NONEQUIDISTANT ARRAYS OF NONLINEAR WAVE-GUIDES

We describe the evolution of self-focused light beams in arrays of non linear waveguides taking into account the variation of the coupling st rength across the array, The respective equation of motion is a partic ular form of the Discrete Nonlinear Schrodinger Equation. Stable beams correspond to spatial solitary waves which may move across the array according to gradients of the coupling strength, The interplay of inho mogeneous coupling and nonlinear localization allows for power-control led beam steering. In the present paper we investigate the steering ef fect using equations of motion for the beam parameters which are deriv ed by means of a variational method. We compare the respective results with those of fully numerical simulations.