Dual hollow-core anti-resonant fiber polarization beam splitter with excellent single-mode characteristics for ultra-broadband

Abstract In this paper, we propose an ultra-wideband polarization beam splitter for a dual hollow-core anti-resonant fiber. We use a finite element algorithm to analyze the effects of each parameter of the dual hollow-core anti-resonant fiber on the coupling length, coupling length ratio and higher-order mode extinction ratio for x-polarized and y-polarized modes in detail. The final simulation structure shows that the designed dual hollow-core anti-resonant fiber polarization beam splitter possesses an ultra-wide bandwidth of up to 510 nm in the range of 1430–1940 nm and also exhibits outstanding single-mode characteristics in the corresponding range. We believe that the proposed dual hollow-core anti-resonant fiber polarization beam splitter has broad development and application prospects in fiber optic communication, fiber optic gyroscope, fiber optic sensing, etc.