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% This code solves the NLS equation with the split-step method% idu/dz - sgn(beta2)/2 d^2u/d(tau)^2 + N^2*|u|^2*u = 0% Written by Govind P. Agrawal in March 2005 for the NLFO book%---Specify input parametersclear all; %distance = input(’Enter fiber length (in units of L_D) =’); %beta2 = input(’dispersion: 1 for normal, -1 for anomalous’);%N = input(’Nonlinear parameter N = ’); % soliton ordermshape = input(’m = 0 for sech, m > 0 for super-Gaussian = ’);chirp0 = 0; % input pulse chirp (default va
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