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+// Example 10.8
+// Calculation of the Stokes signal power at the fiber output
+// Page no 480
+
+clc;
+clear;
+close;
+
+//Given data
+p1=20;                       // Input power pump
+ps=-10;                      // Input Stokes’s signal power
+alpha=0.08;
+L=2;                        // Length of fiber
+alpha1=0.046;
+A=40*10^-12;               // Effective area of fiber
+g=1*10^-13;                // Raman coefficient of the fiber
+
+// The Stokes signal power at the fiber output
+p1=10^(p1/10);
+ps=10^(ps/10);
+Le=(1-exp(-alpha*L))/alpha;
+s=(g*p1*Le)/A;
+d=alpha1*L;
+pd=ps*%e^(-d+s);
+
+
+
+// Displaying results in the command window            
+printf("\n The Stokes signal power at the fiber output  = %0.15f mW ",pd);
+
+