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+// Example 6.8 //find output power and bandwidth
+clc;
+clear;
+close;
+Pdc=320*10^-6;//d.c. power in Watt
+f1=20*10^6;//frequency in hertz
+Ti=5*10^-9;//recombination life time in nano second
+Pe1=(Pdc/sqrt(1+(2*%pi*f1*Ti)^2))*10^6;
+f2=100*10^6;//frequency in hertz
+Pe2=(Pdc/sqrt(1+(2*%pi*f2*Ti)^2))*10^6;
+f=((sqrt(3))/(2*%pi*Ti));//in MHz
+fele=f*0.707;//
+disp(Pe1,"overall power in micro Watt when frequecy is 20 MHz")
+disp(Pe2,"overall power in micro Watt when frequecy is 80 MHz")
+disp(f*10^-6,"optical bandwidth in MHz is")
+disp(round(fele*10^-6),"electrical bandwidth in MHz is")