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// Scilab Code Ex7.10:: Page-7.14 (2009)
clc; clear;
n1 = 1.480; // Refractive index of core material
n2 = 1.47; // Refractive index of cladding material
lambda = 850e-006; // Wavelength of light used, m
NA = sqrt(n1^2-n2^2); // Numerical aperture of the step index fibre
theta0 = asind(NA); // Maximum acceptance angle for the fibre, degrees
M_N = 1; // Number of modes in step index cable
// As number of modes, M_N = 1/2*V^2, solving for V
V = sqrt(2*M_N); // V-number for the fibre
// As V = 2*%pi*a/lambda*NA, solving for a
a = V*lambda/(2*%pi*NA); // Radius of core for single mode operation in step index fibre, m
printf("\nThe radius of core for single mode operation in step index fibre = %3.1e", a);
// Result
// The radius of core for single mode operation in step index fibre = 1.1e-03
// The ansswer is quoted wrong in the textbook
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