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// Example 9.11.a;//Optical gain
clc;
clear;
close;
e=1.6*10^-19;//elecronic charge
h=1.26;//wavelength in micro meter
C=3*10^8;//SPEED of light in meter per second
n=0.60;//efficiency
ht=6.62*10^-34;//plank constt.
Ic=15;//CURRENT IN milli ampere
Po=125;//output power in micro watt
Gc=(ht*C*Ic*10^-3)/(h*10^-6*e*Po*10^-6);//Gain
disp(Gc,"optical gain is")
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