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In this thesis, we study the dynamics of the non-linear propagation of ultrashort pulses in an optical fiber. These dynamics are governed by the high nonlinear Schrödinger equation. We focused on the study chirped solitary pulses in a highly nonlinear optical fiber with non-Kerr quintic nonlinearities. The HNLS equation has been used to describe the transmission of femtosecond pulses, combining the derived Kerr nonlinearity with non-Kerr nonlinear terms.
Various types of localised chirped waves were identified, including black chirped luminous solitons and kinks. Bright non-linear chirped light solitons were obtained with a special ansatz on a continuous wave background. The frequency chirp of the localised structures has a quadratic dependence on light intensity, influenced by self-steepening, self-frequency shift and derivative non-Kerr non-linearities.
These results enrich our understanding of the physical and dynamic processes in nonlinear optical fibers, opening up prospects for potential applications in optical communication. This work has been published internationally in a recognised journal: Results in physics
Key words: Non-linear Schrödinger equation,Chirpedlocalised waves,Highly nonlinear optical fiber,Frequency chirp,Non-Kerr quintic non-linearities.

Item Type	Thesis
Divisions	» Laboratory of Physics for Matter and Radiation » Vice Rectorate of Development and Planning
ePrint ID	5420
Date Deposited	2025-06-04
Further Information	Google Scholar
URI	https://univ-soukahras.dz/en/publication/article/5420

@phdthesis{uniusa5420,
    title={Etude de la propagation des impulsions lumineuses ultra-courtes dans les milieux diélectriques non linéaires},
    author={faissal MANSOURI},
    year={2025},
    school={University of souk ahras}
}