sspropvc.m

非线性光纤光学

% This function solves the coupled-mode nonlinear Schrodinger equations for
% pulse propagation in an optical fiber using the split-step
% Fourier method.
% 
% The following effects are included in the model: group velocity
% dispersion (GVD), higher order dispersion, polarization
% dependent loss, arbitrary fiber birefringence, and
% self-phase modulation. 
%
% USAGE
%
% [u1x,u1y] = sspropvc(u0x,u0y,dt,dz,nz,alphaa,alphab,betapa,betapb,gamma);
% [u1x,u1y] = sspropvc(u0x,u0y,dt,dz,nz,alphaa,alphab,betapa,betapb,gamma,psp);
% [u1x,u1y] = sspropvc(u0x,u0y,dt,dz,nz,alphaa,alphab,betapa,betapb,gamma,psp,method);
% [u1x,u1y] = sspropvc(u0x,u0y,dt,dz,nz,alphaa,alphab,betapa,betapb,gamma,psp,method,maxiter;
% [u1x,u1y] = sspropvc(u0x,u0y,dt,dz,nz,alphaa,alphab,betapa,betapb,gamma,psp,method,maxiter,tol);
%
%
% INPUT
%
% u0x, u0y        Starting field amplitude components
% dt              Time step
% dz              Propagation step size
% nz              Number of steps to take (i.e. L = dz*nz)
% alphaa, alphab  Power loss coefficients for the two eigenstates
%                   (see note (2) below)
% betapa, betapb  Dispersion polynomial coefs, [beta_0 ... beta_m] 
%                   for the two eigenstates (see note (3) below)
% gamma           Nonlinearity coefficient
% psp             Polarization eigenstate (PSP) of fiber, see (4)
% method          Which method to use, either 抍ircular