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Spatiotemporal mode decomposition of ultrashort pulses in linear and nonlinear graded-index multimode fibers

par Zitelli, Mario;Couderc, Vincent;Ferraro, Mario;Mangini, Fabio;Parra-Rivas, Pedro ;Sun, Yifan ;Wabnitz, Stefan
Référence Photonics research, 11, 5, page (750)
Publication Publié, 2023-04

Article révisé par les pairs

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Résumé :

We develop a spatiotemporal mode decomposition technique to study the spatial and temporal mode power distribution of ultrashort pulses in long spans of graded-index multimode fiber, for different input laser conditions. We find that the beam mode power content in the dispersive pulse propagation regime can be described by the Bose–Einstein law, as a result of the process of power diffusion from linear and nonlinear mode coupling among nondegenerate mode groups. In the soliton regime, the output mode power distribution approaches the Rayleigh–Jeans law.