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+//Example 12.4: Total power
+clc;
+clear;
+close;
+//given data :
+L_eff=20;// in km
+del_lamdaC=125;// in nm
+gR=6*10^-14;// m/W
+A_eff=55*10^-12;// in m^2;
+del_lamdaS=0.8;// in nm
+N=32;// number of channels
+F=0.1;//  constant
+P_tot=(4*F*del_lamdaC*A_eff)/(gR*del_lamdaS*L_eff*(N-1));
+disp(P_tot,"Total power,P_tot(mW) = ")