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In this paper the design of 8-channel Dense wavelength division multiplexing (DWDM) chaotic system is presented at frequencies ranging from 193.0 TIIz to 193.7 Thz. The chaotic signals are generated by. using semiconductor laser and mathematically modeled by laser rate equation. The Gain flattening! filter (OFF) is used with Erbium doped fiber amplifier (EDFA) in DWDM communication model for long distance transmission. The optimization of Gain| flattening filter is done in chaotic environment to achieve the flattened gain profile of EDFA. The synchronization of chaos at transmitter and receiver is| achieved to recover the received signal. Thus, our scheme combines two advantages i.e. efficient bandwidth utilization and security at the same time inj DWDM communication model. [ABSTRACT FROM AUTHOR]

We characterize the chaotic dynamics of semiconductor lasers subject to either optical or electrooptical feedback modeled by Lang-Kobayashi and Ikeda equations, respectively. This characterization is relevant for secure optical communications based on chaos encryption. In particular, for each system we compute as a function of tunable parameters the Lyapunov spectrum, Kaplan-Yorke dimension and Kolmogorov-Sinai entropy. [ABSTRACT FROM AUTHOR]

A numerical analysis of an optical chaotic transmission system, based on the synchronization of two chaotic lasers, in a master-slave closed loop configuration is presented. At the transmitter, the master chaotic wave is superposed on the information message; at the receiver, the message is recovered by subtracting the synchronized slave chaotic wave from the received signal. The performances are analyzed in terms of the Q-factor, considering two different message modulation formats: the nonreturn-to-zero and the Manchester coding. The Manchester coding shows enhanced performances due to the shift of the signal spectrum to higher frequencies. [ABSTRACT FROM PUBLISHER]

The demonstration of chaotic message relay using three chaotic distributed feedback diode lasers is reported. A 1-GHz message has been encoded in a chaotic carrier and relayed to a terminal receiver laser via a mediator laser. The message has been successfully extracted at both the mediator and receiver lasers. The message relay capability thereby demonstrated provides a key functionality for chaotic optical communication networks. [ABSTRACT FROM PUBLISHER]