Modeling the tapering effects on the modal parameters of a hollow-core photonic bandgap fiber

A numerical study of the effects of tapering a hollow-core photonic bandgap fiber (HC-PBGF) on the spatial parameters: effective area, nonlinear parameter and dispersion parameter is presented. The taper on the fiber is modeled by scaling the cross section of the original fiber geometry. Both the air and the silica contribution to the effective area and the nonlinear parameter are shown. The obtained results show a blueshift of the transmission band and of the zero-dispersion wavelength. By tapering the fiber 30%, the transmission band and the zerodispersion wavelength blueshift around 300 nm and 320 nm, respectively. HC-PBGFs have made possible the study of nonlinear optical effects and by tapering the fiber, such nonlinear phenomena can be made stronger.