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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
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