This paper recovers cubic–quartic solitons in fiber Bragg gratings with dispersive reflectivity having anti-cubic nonlinear form. Two integration approaches make this retrieval possible. The modified Kudryashov's integration scheme reveals a first set of solitons while the addendum to this scheme yields the second set of solitons that completes the picture. The existence criteria of such solitons are displayed.
- Bragg gratings