  In a cavity filled with a Kerr medium it is possible to generate the
superposition of coherent states, i.e. Schroodinger cat states may be realized
in this system. We show that such a medium may be mimicked by the propagation
of a conveniently shaped Gaussian beam in a GRIN device. This is attained by
introducing a second order correction to the paraxial propagation of the beam.
An additional result is that a Gaussian beam propagating in GRIN media, may
split into two Gaussian beams.
