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+
+//Optoelectronics and Fiber Optics Communication by C.R. Sarkar and D.C. Sarkar
+//Example 6.3
+//OS = Windows 7
+//Scilab version 5.5.2
+
+clc;
+clear;
+
+//given
+eta=0.65;//quantum efficiency
+E=1.5*10^-19;//energy of the photons in V
+Ip=3*10^-6;//diode current in A
+h=6.62*10^-34;//Plank's constant in SI unit
+c=3*10^8;//speed of the light in m/s
+e=1.9*10^-19;//electric charge in coulomb
+lamda=(h*c)/E;//wavelengthof the operating diode in m
+f=c/lamda;//frequency in Hz
+R=(eta*e)/(h*f);//responsivity in A/W
+Po=Ip/R;//incident optical power in W
+mprintf("\n Operating wavelength is =%.2f um",lamda*1e6);//multiplication by 1e6 for conversion of unit from m to um
+mprintf("\n Incident optical power is =%.2f uW ",Po*1e6);//multiplication by 1e6 for conversion of unit from W to uW//the answer vary due to rounding