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diff --git a/1655/CH8/EX8.3.1/Example_8_3_1.sce b/1655/CH8/EX8.3.1/Example_8_3_1.sce
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+// Example 8.3.1  page 8.9

+

+clc;

+clear;

+

+P=10^-9;    //probability of error

+eta=1;      //ideal detector

+h=6.626d-34 //plank's constant

+c=3d8;     //speed of light

+lamda=1d-6; //wavelength

+B=10^7;     //bit rate

+

+Mn= - log(P);

+printf("\n The quantum imit at the receiver to maintain bit error rate 10^-9 is (%.1f*h*f)/eta.",Mn);

+f=c/lamda

+Popt= 0.5*Mn*h*f*B/eta;     //computing optical power

+Popt_dB = 10 * log10(Popt) + 30;    //optical power in dbm

+Popt=Popt*10^12;

+

+printf("\nMinimum incident optical power is %.1f W or %.1f dBm.",Popt,Popt_dB);