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+// Example 6.12
+// Calculation of the ASE power spectral density per polarization.
+// Page no 296
+
+clc;
+clear;
+close;
+
+//Given data
+
+si=30;                // Electrical SNRs at the amplifier input
+so=25;               // Electrical SNRs at the amplifier output
+po=2;                // Signal power at output 
+pi=-13;             // Signal power at input 
+h=6.626*10^-34;     // Planck constant
+f=195*10^12;
+
+// The ASE power spectral density per polarization
+fn=si-so;
+fn=10^(fn/10);
+G=po-pi;
+G=10^(G/10);
+r=(h*f*(G*fn-1))/2;
+r=r*10^18;
+
+//Displaying results in the command window            
+printf("\n The ASE power spectral density per polarization = %0.3f x 10^-18 W/Hz ",r);
+
+
+