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+//Fiber Optics Communication Technology, by Djafer K. Mynbaev and Lovell L.scheiner
+//Windows 7
+//Scilab version- 6.0.0
+//Example 3.3.4
+clc;
+clear;
+//given
+N1=1.487;//refractive index 
+delta=1.71;
+L=5E3;//length of the graded index fiber
+c=3E8;//velocity of light in m/s
+
+b=delta*delta;
+e=L*N1*b;
+w=8*c;
+deltatg1=(e/w)*1E5;//pulse spreading due to modal dispersion in ns
+deltatg1_by_L=(deltatg1/L)*1E3;//maximum bit rate Mbits/s
+
+mprintf("\n Pulse spreading due to modal dispersion=%.1f ns",deltatg1);
+mprintf("\n Maximum bit rate=%.2f ns/Km",deltatg1_by_L);