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.
Spatiotemporal mode decomposition of ultrashort pulses in linear and nonlinear graded-index multimode fibers / Zitelli, Mario; Couderc, Vincent; Ferraro, Mario; Mangini, Fabio; Parra-Rivas, Pedro; Sun, Yifan; Wabnitz, Stefan. - In: PHOTONICS RESEARCH. - ISSN 2327-9125. - 11:5(2023), pp. 750-756. [10.1364/PRJ.484271]
Spatiotemporal mode decomposition of ultrashort pulses in linear and nonlinear graded-index multimode fibers
Zitelli, Mario;Couderc, Vincent;Ferraro, Mario;Mangini, Fabio;Parra-Rivas, Pedro;Sun, Yifan;Wabnitz, Stefan
2023
Abstract
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.File | Dimensione | Formato | |
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