Open AccessModal perspective on geometric parametric instability sidebands in graded-index multimode fibers
Author(s) -
Weitao He,
Jianan Dai,
Qianqian Ma,
Aiping Luo,
Weiyi Hong
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.422667
Subject(s) - sideband , multi mode optical fiber , optics , physics , parametric statistics , instability , modal , nonlinear system , optical fiber , quantum mechanics , materials science , mathematics , microwave , statistics , polymer chemistry
In this paper, we investigated the geometric parametric instability (GPI) in graded-index multimode fibers through the multimode generalized nonlinear Schrödinger equation. Our results clearly and intuitively indicate that the generations of GPI sidebands are nearly synchronous in the spectrums of all modes, and the shapes of these spectrums are nearly the same. The numerical results show that the energies of the GPI sidebands come from the pump sideband, and these sidebands are carried by similar spatial beam profiles due to the similar modal components. We also found that the large modal dispersion has an influence for the symmetry of these GPI sidebands.