Abstract
•Solitons to Radhakrishnan-Kundu-Lakshmanan (RKL) model are reported.•Dark solitonic structure is found by using the analytical method.•Propagation of different kinds of dark solitons along the optical fiber are discussed.
This paper employs the enhanced version of Kudryashov's scheme to recover optical soliton solution in fiber Bragg gratings that are considered with five different nonlinear forms. The effect of cubic–quartic dispersive reflectivity is included in the analysis. A full spectrum of solitons have emerged from this integration scheme, for a couple of cases.