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+
+//Optoelectronics and Fiber Optics Communication by C.R. Sarkar and D.C. Sarkar
+//Example 2.2
+//OS = Windows 7
+//Scilab version 5.5.2
+
+clc;
+clear;
+
+//given
+n1=1.48;//core refractive index of a step-index fiber
+delta=0.015;//relative index difference between the core and cladding
+lamda=85*10^-8;//wavelength of the fiber in m
+V=2.405;//value of V-number for single mode 
+c=(2*delta)^0.5;//constant value 
+a=(V*lamda)/(2*%pi*n1*c);//value of radius of core diameter in m
+d=2*a;//diameter of core diameter in m
+mprintf("\n Core diameter of the step index fiber is =%.2f um ",d*1e6);
+delta1=0.0015;//relative index difference between the core and the cladding
+c1=(2*delta1)^0.5;//constant value
+a1=(V*lamda)/(2*%pi*n1*c1);//value of radius of core diameter in m
+d1=2*a1;//diameter of core diameter in m
+mprintf("\n Core diameter of the step index fiber is= %.2f um ",d1*1e6);//multiplication by 1e6 to convert the unit from m to um
+//the answer vary due to rounding