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// Example 2.13.2 page 2.57
clc;
clear;
Pin=500d-6; //input power
L=200; //length of fiber
loss=2; //loss associated with fiber
Pin_dbm=10 * log10 (Pin/(10^-3)); //computing input power in dBm
Pin_dbm=round(Pin_dbm);
Pout_dbm=Pin_dbm-L*loss; //computing output power level
Pout= 10^(Pout_dbm/10);
printf("Output power is %.2e mW.",Pout);
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