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

Author:

Zitelli MarioORCID,Couderc Vincent1ORCID,Ferraro MarioORCID,Mangini Fabio,Parra-Rivas PedroORCID,Sun YifanORCID,Wabnitz Stefan2ORCID

Affiliation:

1. Université de Limoges

2. Istituto Nazionale di Ottica

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.

Funder

HORIZON EUROPE European Research Council

H2020 Marie Skłodowska-Curie Actions

Ministero dell’Istruzione, dell’Università e della Ricerca

Sapienza University of Rome

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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