Génération de molécules de solitons, régulation de puissance, régénération et sculpture des profils d'impulsion au sein d'un laser à fibre multifonction

Abstract : The work of this thesis strives to provide a solution to the persistent problem of poverty of mode-locked fiber lasers, in terms of functionality and flexibility. The thesis proposes a fiber-laser cavity having the specificity of being multifunctional. The cavity is equipped with tunable components, which provide the flexibility to realize functions ranging from the generation of pulses with complex profiles (solitons, bi-solitons, tri-solitons, etc.) up to the carving of pulse profiles, passing through the regulation of peak powers, and the regeneration of severely degraded intensity profiles. The laser cavity that we propose has the specificity of being controlled by a key component, which is a multifunctional nonlinear optical loop mirror (NOLM). We have designed this NOLM by making structural modifications in the usual architecture of this device, and by adding to it: a dispersion compensating fiber, a bandpass filter with tunable bandwidth, and an amplifier (preceded by a gain flattening filter, as needed) with tunable gain. These two parameters make it possible to adjust its transfer function, and thus to increase its functionalities and its flexibility. Thus, in addition to its role as a trigger for mode locking, this NOLM performs essential optical functions such as the regeneration of strongly degraded intensity profiles; which contributes to strengthening the stability of the laser.We also show the possibility of regulating the pulse peak power by locking it around a predefined value. Finally, we show that the multifunction laser offers the possibility to carve pulse profiles, that is, to generate pulses endowed with a peak power and a temporal width set in advance through an appropriate adjustment of the NOLM control parameters. The applications targeted by this multifunction laser are those requiring pulses with finely tunable peak power and temporal width. These activities, include the pulse reshaping in Telecoms, operations of compression or stretching of pulse profiles, optical component diagnostics, and non-destructive control of transmission lines
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Bici Chinauyi Junior Igbonacho. Génération de molécules de solitons, régulation de puissance, régénération et sculpture des profils d'impulsion au sein d'un laser à fibre multifonction. Traitement du signal et de l'image [eess.SP]. Université Bourgogne Franche-Comté; Université des Sciences et Techniques de Masuku (Gabon), 2018. Français. ⟨NNT : 2018UBFCK024⟩. ⟨tel-02309168⟩

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