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// Example 6.6
// Calculation of the single-pass gain and 3-dB bandwidth
// Page no 268
clc;
clear;
close;
//Given data
c1=3*10^8; // Velocity of light
f=7*10^9; // Cut off frequency
L=500*10^-6; // Input power
Gp=15; // Peak gain
n=3.2;
Gs=2.52;
R=0.32;
a=0.1024;
b=-0.6546;
c=1;
// The single-pass gain
x1 =( -1*b+ sqrt ((b ^2) -4*a*c)) /(2* a); // 1 s t r o o t
x2 =( -1*b- sqrt ((b ^2) -4*a*c)) /(2* a); // 2nd r o o t
// The 3-dB bandwidth
G=10^(Gp/10);
x=(1-(R*x2))/(2*sqrt(R*x2));
f=(c1/(%pi*L*n))*asin(x);
// f=f*10^-9;
// Displaying results in the command window
printf ( 'Single pass gain Gs= %0.2f or' , x1);
printf ( ' \n Single pass gain Gs= %0.2f ' , x2);
printf("\n The the 3-dB bandwidth = %0.2f GHz ",f*10^-9);
// The answers vary due to round off error
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