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+//Example 2.7.3 page 2.39
+
+clc;
+clear;
+
+Lb= 0.09;
+lamda= 1.55*10^-6;
+delta_lamda = 1*10^-9;
+Bf= lamda/Lb;
+Lbc= lamda^2/(Bf*delta_lamda);
+printf("The modal Bifriengence is %.2f meters ",Lbc);
+beta_xy= 2*%pi/Lb;
+printf("\n\nThe difference between propogation constants is %.2f", beta_xy);