Abstract
<jats:p>We present the design and numerical analysis of negative curvature antiresonant hollow-core fibers employing multiple hyperbola-arc cladding rims. Triangular, square, pentagonal, and hexagonal cores with three or four hyperbola-arc rims significantly reduce light leakage from the core, and the calculated confinement loss is less than 0.001 dB/km based on COMSOL simulations. The hyperbola-arc cladding rims extend linearly toward the outer glass jacket wall, and all rim edges converge to a single point at both ends of each cladding segment. This geometry behaves similarly to a nodeless tubular cladding and reduces confinement loss by eliminating nodal defects. Furthermore, since the hyperbola-arc curvature changes more gradually than that of conventional circular claddings, the incidence angle at the cladding boundary approaches grazing incidence, thereby increasing the Fresnel reflection back into the core compared with conventional tubular claddings. In addition, light leakage into the rim-edge regions between adjacent cladding segments is effectively suppressed thanks to an antiresonant wedge-shaped mirror effect. The proposed fiber structure is expected to be easier to fabricate than nested tubular hollow-core fibers because it does not require the precise positioning and fixation of many unsupported glass tubes in the preform.</jats:p>