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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