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

摘要

PROBLEM TO BE SOLVED: To provide air-core photonic-bandgap fibers free of surface modes.SOLUTION: Computer simulations analyze the relationship between the geometry and the presence of surface modes in an air core photonic-bandgap fiber having a triangular hole pattern and identify ranges of core characteristic dimensions for which the fiber supports no surface modes, i.e., allowing only core modes to be present, over the entire wavelength range of the bandgap. When a hole spacing and a hole radius are both equal to 0.47, the core supports a single mode and supports no surface modes for core radii between about 0.7 and about 1.05, which suggests that such fibers should exhibit a very low propagation loss. The existence of surface modes can be predicted simply and quickly by examining either the bulk modes alone or the geometry of the fiber without requiring a full analysis of the defect modes.