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+// Example 10.3
+// Calculation of the peak power required to form a soliton
+// Page no 435
+
+clc;
+clear;
+close;
+
+//Given data
+
+b=-21*10^-27;       // FWHM of a fundamental soliton
+Tf=50*10^-12;       // Fiber dispersion coefficient
+r=1.1*10^-3;        // Nonlinear coefficient
+
+// The peak power required to form a soliton
+Th=asech(sqrt(0.5));
+f=2*Th;
+T0=Tf/f;
+n=(sqrt(-b))/T0;
+P=(n^2)/r;
+//P=P*10^2;
+
+
+// Displaying results in the command window            
+printf("\n The peak power required to form a soliton = %0.1f mW",P*10^2);
+
+// Answer is wrong in book
+