9.2-4 Propagation Constants and Wavevector (Step-Index Fiber). A step-index fiber of radiusa = 20 um and refractive indexes n = 1.47 and n2 = 1.46 operates at d, = 1.55 um.Using the quasi-plane wave theory and considering only guided modes with azimuthal index1 = 1:(a) Determine the smallest and largest propagation constants.(b) For the mode with the smallest propagation constant, determine the radii of the cylindri-cal shell within which the wave is confined, and the components of the wavevector k atr = 5 um.

Given that,a=20μmn1=1.47n2=1.46λ0=1.55μml=1we know,Wave vector k0=2πλ=4×106…

Answered: 9.2-4 Propagation Constants and…

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