Effects of Core Count and Layout on the Bending-Radius-Dependent Crosstalk Variations in Heterogeneous and Trench-Assisted Heterogeneous Multicore Fiber

摘要

Effects of increasing core count in limited cladding diameter and cladding thickness constraints and their arrangements, i.e., core layouts on the crosstalk variation in heterogeneous and trench-assisted (TA) heterogeneous MCFs are investigated using the expression of crosstalk derived from the coupled mode equations and the finite element method (FEM) based FemSIM software. Only two kinds of heterogeneous cores having different core radius and refractive index are used in the present analysis. For 12-Core TA MCF, approx. 35 dB of crosstalk level can be optimized by proper selection of core layout, and whereas for high core count such as 24-Core and 30-Core TA MCFs, this value reduces to 30 dB and 20 dB, respectively, due to the decrease in the core pitch and the increase in the number of surrounding cores. This result shows that core count and layout have a significant impact on the crosstalk variations in MCFs.