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+// Example 9.9
+// Calculation of the (a) the signal power/subcarrier/polarization at the fiber output, (b) the data rate and (c) the spectral efficiency
+// Page no 414
+
+clc;
+clear;
+close;
+
+//Given data
+fl=0.19;            // Fiber loss
+fg=70;              // Fiber length
+nc=24;             // No of channels
+ip=2;
+bs=10*10^9;        // Symbol rate per polarization
+ts= 12.8*10^-9;    // Symbol period
+n=64;              // No of subcarriers
+np=2;              // Launch power to the fiber
+
+
+// (a) The signal power/subcarrier/polarization at the fiber output
+T=fl*fg;
+p=ip-T;
+p1=10^(p/10);
+s=p1/(np*n);
+//s=s*10^4;
+
+// (b) The data rate
+bs=1/ts;
+B=log2(n)*bs;
+bt=B*2*n;
+
+// (c) the spectral efficiency
+Tb=n*bs;
+se=bt/Tb;
+
+
+
+
+//Displaying results in the command window            
+printf("\n The signal power/subcarrier/polarization at the fiber output = %0.3f x 10^-4 mW ",s*10^4);
+
+printf("\n The data rate = %0.0f Gb/s ",bt*10^-9);
+
+printf("\n The spectral efficiency = %0.0f b/s/Hz ",se);
+
+// The answers vary due to round off error