Influence of dispersion properties on pulse propagation in GeSe2-As2Se3-PbSe chalcogenide photonic crystal fibers
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https://doi.org/10.54939/1859-1043.j.mst.97.2024.129-137Keywords:
Photonic crystal fiber; Dispersion; Chalcogenide; Nonlinear.Abstract
In this paper, we present the results of a study on pulse propagation in photonic crystal fibers made from GeSe2-As2Se3-PbSe chalcogenide. We employ the Slip-Step-Fourier method to solve the general nonlinear Schrödinger equation, seeking solutions for the output pulse during the propagation in the photonic crystal fiber. The results indicate that the dispersion properties significantly influence the characteristics of the output pulse, including spectral broadening and pulse stability. Using a photonic crystal fiber with a length of 10 cm, where the input pulse is a Gaussian pulse with a frequency of f = 200 fs, pump pulse energy E = 1.5 nJ, corresponding to a pump intensity of P = 7.5 kW, at a pump wavelength λ = 3500 nm, if the dispersion properties are adjusted so that the pump wavelength can shift from the normal dispersion region to the anomalous dispersion region, the obtained output pulse exhibits increased spectral width (corresponding to 2600 nm and 7000 nm). However, the output pulse, in this case, is characterized by higher noise and reduced stability. The research findings present a viable solution for modifying the characteristics of output pulses applicable to supercontinuum light sources.
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