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+//Optical Fiber communication by A selvarajan
+//example 5.5
+//OS=Windows XP sp3
+//Scilab version 5.5.1
+clc;
+clear all;
+//given 
+h=6.6*10^-34//planck's constant
+c=3*10^8//velocity of light in m/s
+q=1.6*10^-19//charge of an elctron in columb
+lambda=0.85*10^-6//wavelength in m
+I=0.1//incident light intensity in mW/mm2
+Iph1=10*1e-6//photocurrent in pin in A
+Iph2=500*1e-6//photocurrent in APD in A
+A=0.2//detector area in mm2
+P=I*A//Power seen by detector in mW
+photons_generated=P*1e-3/(h*c/lambda)//photons Generated
+Rate=Iph1/q//rate of carrier generation for pin
+eta=Rate/photons_generated;//Quantum efficiency for pin
+M=Iph2/Iph1//Multiplication factor
+mprintf('Quantum efficiency is=%f',eta);//The answers vary due to round off error
+mprintf('\n Avalanche multiple factor=%f',M);
+