Abstract
We propose a temporal manipulation scheme for the inner-mode interactions in graded-index multimode fibers (GRIN-MMF). In this scheme, a so-called Pearcey-Gaussian (PeG) wave packet is constructed for the pulse profile, which allows the manipulation of the self-compressing control by the second- and third-order dispersions. Our simulations show that such linear compressing cooperates with the nonlinear compressing of the Kerr effect when the wavelength is close to the zero-dispersion point of the fiber, which enables the manipulation of the nonlinear energy transfer from the higher modes to the fundamental one. Such cooperation of the linear and nonlinear effects triggers a Stokes soliton in the fundamental mode while the Raman red-shifts in the higher modes are negligible. After the proper filter in the spectrum, a nearly perfect Raman self-cleaning with the energy of the fundamental mode reaching 97.2 % is observed.
Highlights
In recent years, the multimode optical fibers (MMF) have drawn a great deal of attention for their potential to break the Shannon limit through spatial-division multiplexing, and the MMF are served as a convenient platform to study complex space-time nonlinear dynamics
The simulation results based on the coupled-mode theory reported by Krupa et al are consistent with experiments, which shows a transfer of energy from higher-order modes (HOMs) to the fundamental mode through the Kerr nonlinearity [7], [8]
After the proper filter in the spectrum, a nearly perfect Raman self-cleaning with the energy of the fundamental mode reaching 97.2 % is observed
Summary
The multimode optical fibers (MMF) have drawn a great deal of attention for their potential to break the Shannon limit through spatial-division multiplexing, and the MMF are served as a convenient platform to study complex space-time nonlinear dynamics. The simulation results based on the coupled-mode theory reported by Krupa et al are consistent with experiments, which shows a transfer of energy from higher-order modes (HOMs) to the fundamental mode through the Kerr nonlinearity [7], [8] They have shown that the previously unrecognized process of disorder-induced acceleration of condensation and experimentally demonstrate the analogous hydrodynamic 2D turbulence [9] can be utilized to explain the phenomenon of beam self-cleaning. For a given multimode fiber, one can tune the wavelength of the PeG pulse near the zero-dispersion point of the fiber to achieve the modulation of the self-compressing Such specially-constructed temporal wave packet could cooperate with the nonlinear compressing from the Kerr effect, which could enable the manipulation of the nonlinear energy transfer from the higher modes to the fundamental one. After the proper filter in the spectrum, a nearly perfect Raman self-cleaning with the energy of the fundamental mode reaching 97.2 % is observed
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