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// Example 9.20.1 page 9.65
clc;
clear;
gain_db=25;
lamdaP=980d-9;
lamdaS=1550d-9;
Pp=40d-3;
gain=10^(gain_db/10); //computing gain
Pin=(lamdaP/lamdaS)*Pp/(gain-1); //computing maximum input power
Pout=Pin+(lamdaP/lamdaS)*Pp; //computing maximum output power
Pout_db=10*log10(Pout/10^-3); //computing maximum output power in dB
Pin=Pin*10^6;
printf("\nGain is %.2f.\nMaximum input power is %.2f microWatt.\nMaximum output power is %.2f dbm.",gain,Pin,Pout_db);
printf("\n\nNOTE - calculation error in max input power instead of G-1, G-100 is taken.");
//answer in the book for Max output power is 14.03 dBm, deviation of 0.01
//calculation error in max input power instead of G-1, G-100 is taken, answer given is 116 microWatt
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