Sl. Palacios et al., Dark solitary waves in the nonlinear Schrodinger equation with third orderdispersion, self-steepening, and self-frequency shift, PHYS REV E, 60(1), 1999, pp. R45-R47
We solve the higher order nonlinear Schrodinger equation describing the pro
pagation of ultrashort pulses in optical fibers. By means of the coupled am
plitude-phase formulation fundamental (solitary wave) dark soliton solution
s are found. [S1063-651X(99)51407-4].