Thinking outside the envelope: New perspectives for nonlinear fiber optics J. M. Dudley, G. Genty, P. Kinsler, IEEE/LEOS Winter Topical Meeting, Date: JAN 14-16, 2008 Sorrento ITALY We describe the use of a generalized envelope equation to model pulse propagation in highly nonlinear optical fibers. Simulation results are shown modelling carrier shock formation and supercontinuum generation in fused silica nanowires.