METHOD FOR CONFIGURING AIR-CORE PHOTONIC-BANDGAP FIBERS FREE OF SURFACE MODES

摘要

Coupling of core modes to surface modes in an air core photonic-bandgap fiber(PBF) can cause large propagation losses. Computer simulations analyze therelationship between the geometry and the presence of surface modes in PBFshaving a triangular hole pattern and identify ranges of core characteristicdimensions (e.g., radii) for which the fiber supports no surface modes (i.e.,only core modes are present) over the entire wavelength range of the bandgap.In particular, for a hole spacing and a hole radius = 0.47 , the coresupports a single mode and supports no surface modes for core radii betweenabout 0.7 and about 1.05 , which suggests that such fibers should exhibit avery low propagation loss. The existence of surface modes can be predictedsimply and expediently by studying either the bulk modes alone or the geometryof the fiber without requiring a full analysis of the defect modes.