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+//Fiber Optics Communication Technology, by Djafer K. Mynbaev and Lovell L.scheiner
+//Windows 8
+//Scilab version- 6.0.0
+//Example 12.3.4
+clc;
+clear ;
+//given
+
+Pis=300E-6;//input-signal power in W
+Pin=30E-9;//input noise power in w
+B=1E-9;//Bandwidth in m
+Pos=60E-3;//output signal power in W
+Pon=20E-6;// output noise  power in W
+
+SNRin=Pis/Pin;
+SNRout=Pos/Pon;
+
+Fn=SNRin/SNRout;
+
+mprintf("Noise figure of an optical amplifier = %.2f or %.1fdB",Fn,10*log10(Fn));