  We study the conditions for soliton-like wave propagation in the
Photorefractive (PR) and electro-optic (i.e., Pockels) material, by using
Nonlinear Schrodinger (NLS) equation. The complete NLS equation is solved
analytically and numerically by transforming it into the phase space. Our
results clearly show the existence of both the dark and bright solitary
solutions for the PR medium. Interestingly, however, we find only one bright
solitary solution in the Pockels case and there is no evidence of any dark
solitary solution.

Optics