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+//Fiber Optics Communication Technology, by Djafer K. Mynbaev and Lovell L.scheiner
+//Windows 8
+//Scilab version- 6.0.0
+//Example 12.3.2
+clc;
+clear ;
+//given
+
+g=106;//maximum gain coefficient in 1/cm
+alpha=14;//loss coefficient of a cavity in 1/cm
+GAMA=0.8;//confinement factor
+L1=50E-3;//assumed length of a typical travelling-wave semiconductor amplifier in cm
+y=GAMA*g-alpha;
+z=y*L1;
+Gs1=exp(z);//Gain of a travelling-wave semiconductor amplifier
+mprintf("Gain of a travelling-wave semiconductor amplifier = %.2f.or  %.1f ",Gs1,10*log10(Gs1));
+//case 2
+L2=100E-3;//assumed length of a typical travelling-wave semiconductor amplifier in cm
+y=GAMA*g-alpha;
+z=y*L2;
+Gs2=exp(z);//Gain of a travelling-wave semiconductor amplifier
+mprintf("\nGain of a travelling-wave semiconductor amplifier = %.2f.or  %.1f ",Gs2,10*log10(Gs2));