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 Semiconductor Physics, Quantum Electronics & Optoelectronics, 24 (4), P. 431-435 (2021). DOI: https://doi.org/10.15407/spqeo24.03.431 Cubic-quartic optical soliton perturbation with Fokas–Lenells equation by semi-inverse variation A. Biswas1,2,3,4, A. Dakova5,6, S. Khan4, M. Ekici7, L. Moraru8, M.R. Belic9 1Department of Applied Mathematics, National Research Nuclear University, 31 Kashirskoe Hwy, Moscow-115409, Russian Federation 2Mathematical Modeling and Applied Computation (MMAC) Research Group, Department of Mathematics, King Abdulaziz University, Jeddah-21589, Saudi Arabia 3Department of Mathematics and Applied Mathematics, Sefako Makgatho Health Sciences University, Medunsa-0204, Pretoria, South Africa 4Department of Physics, Chemistry and Mathematics, Alabama A&M University, Normal, AL 35762-4900, USA 5Physics and Technology Faculty, University of Plovdiv “Paisii Hilendarski”, 24 Tsar Asen Str., 4000 Plovdiv, Bulgaria 6Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradcko Shossee, 1784 Soda, Bulgaria 7Department of Mathematics, Faculty of Science and Arts, Yozgat Bozok University, 66100 Yozgat, Turkey 8Faculty of Sciences and Environment, Department of Chemistry, Physics and Environment, Dunarea de Jos University of Galati, 47 Domneasca Str., 800008, Romania 9Institute of Physics Belgrade, Pregrevica 118, 11080 Zemun, Serbia Abstract. This paper recovers cubic-quartic bright optical solitons with perturbed Fokas–Lenells equation. The Hamiltonian perturbation terms appear with maximal permissible intensity. The semi-inverse variational principle is employed to retrieve such solitons. Keywords:csoliton, cubic-quartic, perturbation, Fokas–Lenells equation. Back to Volume 24 N4 This work is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License.