Non-dominated Sorting Genetic Algorithm Optimization Design of a Compact Broadband Asymmetric Dual Hollow Core Antiresonant Fiber Mode Converter

This paper proposes a mode converter design based on an asymmetric dual hollow core antiresonant fiber (ADHCARF), which is applicable to high-capacity mode-division multiplexing (MDM) communication systems using hollow-core fibers (HCFs). To improve the design efficiency of the ADHCARF, a non-dominated sorting genetic algorithm is employed for performance optimization. The resulting mode converter achieves a compact length of 4.7 mm and a bandwidth of 630 nm, covering the E, S, C, L, and U bands. The optimization process completes in as few as 4 iterations and identifies key structural parameters that affect device performance from large datasets. This approach provides guidance for the optimization of HCFbased devices and can also be applied to the design of components such as couplers and wavelength division multiplexers.