Coupling between a conventional single mode fiber and an annular core fiber by fused biconical taper

摘要

The modes in annular core fibers are presented based on the vector finite element method and the beam propagation method. The biconical tapered coupling characteristics between the conventional single mode fiber and the annular core fiber are investigated. The effects of parameters on the coupling characteristic are discussed, including the biconical taper shape and the relative deviation of the single core fiber to the annular core fiber in the splicing process.