Kazuya HAYATA and Masanori KOSHIBA

Department of Electronic Engineering, Hokkaido University, Sapporo, 060 Japan

(Received June 1, 1994; Accepted July 1, 1994)

We show analytically that addition of a quintic term to the positive Kerr-type nonlinearity offers a unique type of kink soliton-like solution with Fermi-Dirac profile. This type of optical kink allows, in contrast to other optical kinks discovered so far, stationary kink formation not only in the time domain but in the spatial domain. The latter could admit of a route for the first time to our knowledge to spatial kink solitons of intensified laser beams. The underlying principle of the optical kink propagation is described.

Key words : optical soliton, kink soliton, cubic-quintic nonlinearity, Fermi-Dirac distribution, nonlinear Schrodinger equation