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Coupled nonlinear Schr\"odinger equations, governing the propagation ofenvelopes of electromagnetic waves in birefringent optical fibers, are studiedin this paper for their potential applications in the secured opticalcommunication. Periodicity and integrability of the CNLS equations are obtainedvia the phase-plane analysis. With the time-delay and perturbations introduced,CNLS equations are chaotified and a chaotic system is proposed. Numerical andanalytical methods are conducted on such system: (I) Phase projections aregiven and the final chaotic states can be observed. (II) Power spectra and thelargest Lyapunov exponents are calculated to corroborate that those motions areindeed chaotic.

Anti-Chaos Control via Nonlinear Schr\"odinger Equations for the secured optical communication