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Spatiotemporal mode decomposition of ultrashort pulses propagating in graded-index multimode fibers

Mario ZitelliVincent CoudercMario Ferraro ...+3 Stefan Wabnitz
Dec 2022
摘要
We develop a spatiotemporal mode decomposition technique to study the modepower distribution of ultrashort pulses emerging from long spans ofgraded-index multimode fiber, for different input laser conditions. We findthat beam mode power content in the dispersive pulse propagation regime can bedescribed by the Bose-Einstein law, as a result of the process of powerdiffusion from linear and nonlinear mode coupling among nondegenerate modegroups. In the soliton regime, the output mode power distribution approachesthe Rayleigh-Jeans law
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