Optimizing the usable bandwidth and loss through core design in realistic hollow-core photonic bandgap fibers

Abstract

The operational bandwidth of hollow-core photonic bandgap fibers (PBGFs) is drastically affected by interactions between the fundamental core mode and surface modes guided at the core-cladding interface. By systematically studying realistic hollow-core PBGFs we identify a new design regime robust in eliminating the presence of surface modes. We present new fiber designs with a fundamental core mode free of anticrossings with surface modes at all wavelengths within the bandgap, allowing for a low-loss operational bandwidth of similar to 17% of the central gap wavelength. (c) 2006 Optical Society of America.