On stabilization of solutions of complex coupled nonlinear Schrodinger equations

We study the stabilization of nonchaotic periodic and quasi-periodic solutions of both integrable (alpha = 1) and nonintegrable (alpha = 2/3) of CCNLS equations of the form: ip(t) + p(xx) + 1/2sigma(\p\(2) + alpha\q\(2))p = gammag(1) (x) exp(-iw(1)t), iq(t) + q(xx) + 1/2sigma(alpha\p\(2) + \q\(2))q = gammag(2) (x) exp(-iw(2)t) where subscripts mean partial derivatives, p(x, t) and q(x, t) are the orthogonal components of an electric field in a glass fiber, i = root-1, the defocusing (sigma = -1) and focusing (sigma = 1) cases are distinguished by sigma; g(1)(x) and g(2)(x) are periodic functions in x and gamma; and w(1) and w(2) are parameters. These solutions do not display sensitive dependence on initial conditions. The stabilization of solutions are studied using a feedback control method and their maximal Lyapunov exponents are calculated. Periodic solutions of this system are important in the study of these coupled equations, since they represent stationary or repeatable behavior.