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+// Example 8.3.2  page 8.11
+
+clc;
+clear;
+
+SN_dB=60;    //signal to noise ratio
+h=6.626d-34 //plank's constant
+c=3d8;     //speed of light
+lamda=1.3d-6; //wavelength
+eta=1;
+B=6.5d6;     //Bandwidth
+
+SN=10^(SN_dB/10);
+f=c/lamda
+Popt= 2*SN*h*f*B/eta;     //computing optical power
+Popt_dB = 10 * log10(Popt) + 30;    //optical power in dbm
+Popt=Popt*10^6;
+printf("\nIncident power required to get an SNR of 60 dB at the receiver is %.4f microWatt or %.3f dBm",Popt,Popt_dB);
+printf("\nNOTE - Calculation error in the book.\nThey have take SN as 10^5 while calculating, which has lead to an error in final answer");
+
+//Calculation error in the book.They have take SN as 10^5 while calculating, which has lead to an error in final answer
+//answer in the book 198.1nW and -37.71 dBm