Mode Analysis and Characterization of Negative Curvature Hollow-Core Fiber under Bending

Negative curvature hollow-core fiber (NC-HCF) is a promising waveguide candidate for long haul transmission, high power laser delivery and macro-/micro-bend sensing. It is important to study in details of its bending characteristics, among which the critical bend radius is a crucial parameter. In this paper, a new semi-analytical model is reported to calculate the critical bend radius accurately. ...