Eigenmodes Carrying Orbital Angular Momentum in Spun Two-Mode Fibers with Four-Fold Rotational Symmetry in the Cross Section

摘要

Higher-order eigenmodes in spun two-mode fibers with geometry-induced four-fold cross-sectional rotational symmetry are studied by coupled-mode analysis. They can be near circularly birefringent and carry orbital angular momentum. Simulation results are given for square-core fibers.