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The objective of this research is to compare pulses travelling through different photonic crystal fiber cores (DPCFC) using both finite element method (FEM) /split step Fourier method (SSFM). A unique DCPCF design with exceptionally high non-linearity has been introduced to achieve ultra-high pulse amplitude. Via a generalized non-linear equation, we evaluate the refractive index ratio and dispersion, for each type which is used, as well as output amplitude for different cores in different photonic crystal fiber core by utilizing the solution for the nonlinear Schrodinger equation (NLSE). Lastly, the findings are compared to different photonic crystal fiber design parameters. This paper provides a photonic crystal fiber design consisting of multiple liquid cores and theoretically solved non-linear equations. It was discovered in this design that the refractive index of propylene glycol (C3H8O2) is greater than ethylene glycol’s (C2H6O2), and that both are far greater than silica's refractive index (SiO2). Propylene (C3H8O2) has a lower dispersion than ethylene glycol (C2H6O2) and silica (SiO2). The output amplitudes of (C3H8O2) and (C2H6O2) were then shown to be substantially bigger than the output amplitudes of (SiO2) with respect to distance and time. This emphasizes the need for using certain liquids as cores in holey fibers, dependent upon their use.

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