Stabilized vortex solitons in layered Kerr media
  In this letter we demonstrate the possibility of stabilizing beams with angular momentum propagating in Kerr media. Large propagation distances without filamentation can be achieved in layered media with alternating focusing and defocusing nonlinearities. Stronger stabilization can be obtained with the addition of an incoherent beam. 
Gaspar D. Montesinos, Victor M. Perez-Garcia, Humberto Michinel, Jose   R. Salgueiro