On the Slow-Wave Helical Clad Elliptical Fibers

Abstract

Lightwave propagation through dielectric helical clad elliptical fibers is presented under the slow-wave consideration. The helical clad is achieved by putting helical turns on the core-clad interface. While treating analytically, two extreme cases of helix pitch angle — i.e., 0° and 90° — are considered along with the use of slowwave approximation. E- and H-field components are determined in the different sections of the guide followed by the evolution of the eigenvalue relation. The effect of ellipse eccentricity is determined on the dispersion characteristics for different operating wavelengths and corresponding to different values of the length of core semi-major axis.