Modal cutoff conditions for a waveguide having an annular guiding region with a parabolically graded refractive-index profile

Abstract

An annular dielectric waveguide having a truncated parabolically graded refractive-index profile in the guiding region has been analytically studied for cutoff conditions. The thickness effect of the annular guiding region on the cutoff values of the z-component of the propagation constant for some lower order modes has been studied for some special cases.