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+//Optoelectronics and Fiber Optics Communication by C.R. Sarkar and D.C. Sarkar
+//Example 3.8
+//OS = Windows 7
+//Scilab version 5.5.2
+
+clc;
+clear;
+
+//given
+n1=1.48;//refractive index of core
+delta=0.0022;//relative refractive index difference
+a=4.5*10^-6;//core radius
+lamda=1.3*10^-6;//wavelength in m
+cod=9*10^-3;//core diameter
+cad=125*10^-3;//cladding diameter
+C=3e8;//velocity of light in m/s
+Vd2VbbydV2=0.48//waveguide dispersion constant at V=2.14
+V=((2*%pi*a)/lamda)*n1*((2*delta)^0.5);//V-number
+n2=n1*(1-delta);
+DelGbyZdelL=(-n2*delta)*Vd2VbbydV2/(C*lamda);//waveguide dispersion in ps/Km?nm
+mprintf("waveguide dispersion =%.2f ps/Km/nm",DelGbyZdelL*1e6)//multiplication by 1e6 to convert unit ps/Km/nm