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//Example 7.7
//Determine the optical output power modulated at frequencies
//(a)20 MHz
//(b)100 MHz
//Also determine electrical and optical bandwidths
clear;
clc ;
close ;
//Given data
P_dc=300*10^(-6); //Watt - OPTICAL OUTPUT POWER
tau_i=5*10^(-9); //s - CARRIER RECOMBINATION LIFETIME
//(a)Optical output power at 20 MHz
f=20*10^6; //Hz - OPERATING FREQUENCY
Pe=P_dc/sqrt(1+(2*%pi*f*tau_i)^2);
printf("\n\n\t (a)Optical output power at %1.0f MHz, Pe(%1.0f MHz) = %0.2f uW.",f/10^6,f/10^6,Pe/10^(-6));
//(b)Optical output power at 100 MHz
f=100*10^6; //Hz - OPERATING FREQUENCY
Pe=P_dc/sqrt(1+(2*%pi*f*tau_i)^2);
printf("\n\n\t (b)Optical output power at %1.0f MHz, Pe(%1.0f MHz) = %0.2f uW.",f/10^6,f/10^6,Pe/10^(-6));
//Optical Bandwidth
Bopt=sqrt(3)/(2*%pi*tau_i);
printf("\n\n\t Optical Bandwidth, Bopt = %0.1f MHz.",Bopt/10^6);
//Electrical Bandwidth
B=Bopt/sqrt(2);
printf("\n\n\t Electrical Bandwidth, B = %0.1f MHz.",B/10^6);
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