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+//clear//
+//Caption:To find primary photocurrent and multiplication factor
+//Example6.5
+//page230
+clear;
+clc;
+close;
+etta = 0.65; //quantum efficiency of silicon qavalanche photodiode
+C = 3*(10^8); //free space velocity in m/s
+Lambda = 900e-09;//wavelength in meters
+q = 1.6*(10^-19);//charge in coulombs
+h = 6.625*(10^-34);//planks constant
+v = C/Lambda; //frequnecy in Hz
+Pin = 0.5*10^-06;//optical power
+Ip = ((etta*q)/(h*v))*Pin;
+Im = 10*(10^-06); //multiplied photocurrent
+M = Im/Ip; //multiplication factor
+disp(Ip*10^6,'Primary photocurrent in uAmps Ip=')
+disp(ceil(M),'Primary photocurrent is multiplied by a factor of M =')
+//Result
+//Primary photocurrent in uAmps Ip =    0.2354717  
+//Primary photocurrent is multiplied by a factor of M =  43.