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+//Fiber-optics communication technology, by Djafer K. Mynbaev and Lowell L. Scheiner
+//Example 10.3.3
+//windows 7
+//Scilab version-6.0.0
+clc;
+clear ;
+//given
+RIN=1E-16;//relative intensity in 1/Hz
+P=100E-6;//power received in W
+BW=100E+6;//Receiver bandwidth in Hz
+
+PN=sqrt(RIN*(P^2)*BW);//The average noise power detected by receiver W
+
+mprintf("The average noise power detected by receiver = %.2f uW",PN*1E+6);
+//multiplication by 1e6 to convert unit to W from uW