Nn. Akhmediev et al., EXACT LOCALIZED SOLUTION FOR NONCONSERVATIVE SYSTEMS WITH DELAYED NONLINEAR RESPONSE, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 57(3), 1998, pp. 3664-3667
We found an exact solitonlike solution for systems with gain and loss
and delayed nonlinear response. An example of an application of this s
olution is the passively mode-locked laser with slow saturable absorbe
r.