Chaotic soliton walk in periodically modulated media

We show that a weak transverse spatial modulation in (2+1) nonlinear Schrodinger-type equation can result in nontrivial dynamics of a radially symmetric soliton. We provide examples of chaotic soliton motion in periodic media both for conservative and dissipative cases. We show that complex dynamics can persist even for soliton sizes greater than the modulation period.