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// Example 7.1
// Compuatation of the lower limit on the transmitter power
//
// Page no. 305
clc;
clear;
close;
//Given data
q=1.6*10^-19;
R=1;
B=7*10^9;
c=3*10^8; // Velocity of light
h=6.62*10^-34; // Planck constant
Q=6;
k=1.38*10^-23; // Boltzman constant
T=298;
Rl=50;
alpha=0.046; // Fiber loss coefficient
L=130; // Length
// The lower limit on the transmitter power
a=2*q*R*B;
b=(4*k*T*B)/Rl;
p=(2*sqrt(b)/R*Q)+((a*Q^2)/R^2);
Pi=p*exp(alpha*L);
//Displaying the result in command window
printf("\n The lower limit on the transmitter power = %0.2f mW",Pi*10^3);
printf("\n The lower limit on the transmitter peak power is 7.23mW. If the transmitter peak power < 7.23mW, Q < 6.");
// The answer vary due to round off error
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