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// Example No. 2.14
// To calculate the lower limit on the transmitter power in dBm and mW units.
// Page No. 83
clc;
clear;
// Given data
l=80; // Length of fiber in km
F1=-0.2*l; // Fiber loss in dB
F2=-0.5; // Filter loss in dB
G=15; // Amplifier gain in dB
Pout=-3; // Minimum power required at the receiver in dBm
// Lower limit on the transmitter power
Pin=Pout-F1-F2-G; // Lower limit on the transmitter power in dBm
PinmW=10^(0.1*Pin); // Lower limit on the transmitter power in mW
// Displaying the result in command window
printf('\n The lower limit on the transmitter power in dBm = %0.1f',Pin);
printf('\n The lower limit on the transmitter power in mW = %0.4f',PinmW);
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