An efficient method is introduced in this paper to compute the dispersion characteristics as well as the Poynting flux distribution of radially stratified fibers. Only 4 × 4 matrix operations were needed. Detailed results are given for several representative radially inhomogeneous fibers of practical interest.
C. Yeh and G. Lindgren, "Computing the propagation characteristics of radially stratified fibers: an efficient method," Appl. Opt. 16, 483-493 (1977)