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+//Optical Fiber communication by A selvarajan
+//example 6.2
+//OS=Windows XP sp3
+//Scilab version 5.5.1
+clc;
+clear all;
+//given 
+b=0.5//normalized propoagation constant
+V=(2*atan(b/(1-b))/(sqrt(1-b)))//normalized frequency
+mprintf('Normalized frequency=%f',V)
+lamda=1.3;//wavelength in um
+n1=2.21;//Film refractive index
+n2=2.2;//substrate refractive index
+t=(lamda)/(2*%pi*sqrt(n1*n1-n2*n2));//Thickness of film in um
+mprintf('\nFilm thickness=%fum',t);