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+//Fiber-optics communication technology, by Djafer K. Mynbaev and Lowell L. Scheiner 
+//Example 3.3.2
+//windows 7
+//Scilab version-6.0.0
+clc;
+clear;
+//given
+L=5;//fiber length in km
+NA=0.275;//numerical aperture
+c=3E5;//speed of light in km
+n1=1.48;//refractive index
+
+p=2*c*n1;
+
+e=NA*NA;
+
+d=L*e;
+
+deltatsi=(d/p)*1E9;//pulse spreading in ns //answer vary due round-off
+deltatsi_by_L=(deltatsi/L)//pulse spreading per unit length in ns/Km//answer vary due round-off
+
+mprintf("\n Light pulse spreading= %.2f ns",deltatsi);
+mprintf("\n Pulse spreading per unit length is=%.2f ns/Km",deltatsi_by_L);