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+
+//Optoelectronics and Fiber Optics Communication by C.R. Sarkar and D.C. Sarkar

+//Example 6.1

+//OS = Windows 7

+//Scilab version 5.5.2

+

+clc;

+clear;

+

+//given

+eta=0.70;//quantum efficiency 

+E=2.2*10^-19;//energy of the photons in Joule

+Ip=2*10^-6;//photocurrent in A //the value in question is different from that used in solution in question it is mA and in solution it is uA

+h=6.62*10^-34;//Planck's constant in SI units

+c=3*10^8;//speed of the light in m/s

+e=1.9*10^-19;//electric charge in coulomb

+lamda=(h*c)/E;//operating wavelength of the photodiode in m

+f=c/lamda;//frequency in Hz

+R=(eta*e)/(h*f);//Responsivity in A/W

+Po=Ip/R;//incident power in W

+mprintf("\n Operating wavelength of the photodiode is= %.2f um",lamda*1e6);//multiplication by 1e6 for conversion of unit from m to um

+mprintf("\n Incident power is =%.2f uW",Po*1e6);//multiplication by 1e6 for conversion of unit from W to uW