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We study coherent and incoherent interactions between discrete vortex andfundamental solitons in two-dimensional photonic lattices, presenting a newscheme for all-optical routings and topological transformations of vorticities.Due to the multi-lobe intensity and step-phase structure of the discrete vortexsoliton, the coherent soliton-interactions allow both solitons to be steeredinto multiple different possible destination ports depending on the initialphase of the discrete fundamental soliton. We show that charge-flipping ofphase singularities and orbital angular momentum transfer can occur during thecoherent interactions between the two solitons. For incoherent interactions, bycontrolling the relative intensities of the two solitons, we reveal thatsoliton-steering can be realized by either attracting the discrete fundamentalsoliton to four ports or localizing the four-lobe discrete vortex soliton intoa ring soliton.

Beam steering and topological transformations driven by interactions between discrete vortex and fundamental solitons