Finite element modelling of independent core propagation in multicore photonic crystal fibres resulting from anisotropy in structure

Abstract

COMSOL MULTIPHYSICS software based on the finite element method is being used to simulate the random anisotropy in diameters of the cores formed in multicore photonic crystal fibre structures, and this may affect the coupling properties between the cores’ modes. Consequently, this leads to a reduction in the coupling efficiency between the cores with different structures. This anisotropy in diameters of the cores leads to the creation of a small mismatch between the modes of these cores and is sufficient to inhibit coupling. The coupling properties are affected hugely depending on the amount of the change in core diameter and increasing the number of cores coupled inside the multicore structure. We also found an improvement in the coupling efficiency when increasing the number of cores within the structure of the multicore photonic crystal fibres; otherwise, the independent light propagation of each core inside the multicore structure, with/without a little penetration with other adjacent cores. As the coupling efficiency of seven-core coupled is better than three-core, and the latter may be better than two-core in which the cores appear decoupled and independent in their propagated for the adjacent other cores. It can be considered this study a novel characteristic of multiplexing-demultiplexing applications.

Experimental researches and testing of silica twisted six-GeO2-doped core microstructured optical fiber. Part I: fusion splicing with telecommunication optical fibers and differential mode delay map measurements

“…More "conventional" MOF configuration is based on stacks with inclusion of doped silica rods. According to published results of simulations and theoretical researches, increased refractive index of MOF cores improves unique properties characteristic of all-silica multi-core MOFs (in-phase supermode regime [36][37][38][39] ; band pass filtration and splitting 40,41 ) and discovers novel features (guiding systems for optical networks with using SDM technique 42,43 ; SDM channel multiplexing / demultiplexing [44][45][46][47] ). There is a set of published works [48][49][50][51][52][53][54] , concerned with Yb-doped multicore (6 48,50,51 , 7 52,54 , 12 49 , and 18 53 cores) MOFs/PCFs for high power fiber lasers, while GeO2-doped core MOFs was designed and fabricated for supercontinuum generation (3 cores) 55,56 , and for guiding systems 57 and splitters 58 for SDM fiber optic transmission system / next generation optical networks (7 cores).…”