Abstract
In this article, we propose, investigate, and analyze a novel designed two guided modes regions ring-core photonic crystal fiber (PCF) with relatively greater effective refractive index separation and also high isolation value which can be negligible the crosstalk among the guided channels. The designed PCF can be well supported up to 76 orbital angular momentum (OAM) modes and 6 linear polarization (LP) modes over 800 nm bandwidth. The background and ring-core materials of the proposed PCF are silicon and Shcott sulfur difluoride (SF2) glass, respectively. All characteristic features of the proposed PCF are successively analyzed using the finite element method (FEM) and the perfectly matched layer (PML) as a boundary condition within the COMSOL Multiphysics simulator. The designed PCF possess the good propagation features because the results show that the better mode quality (96%), the isolation value is kept above 72 dB that produces the very low crosstalk between the guided channels, high numerical aperture, relatively flat and small dispersion variations, and low confinement loss, etc. Therefore, these outstanding properties of the designed PCF prove that it has potential applications to enable the large-capacity transmission along with the high-speed optics communications.
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