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Resumo : Este artigo descreve uma tecnica de comunica­ ~oes baseada empulsos de lasers ca6ticos. Urn sinal portador de informa~iio e camuflado por pulsos portadores ca6ticos, e recuperados atraves de sincroniza~iioca6tica em urn receptor ca6tico. Dois circuitos anal6gicos, representando lasers ca6­ ticos de C02, simulam 0 sistema. A pulsa~ao ca6tica do pri­ meiro sistema e modulada e transmitida ao segundo sistema, o qual atua como receptor e demodula 0 sinal por sincroni­ za~iio. Series temporais fornecem 0 espectro de potencia e mapas da se~iio de Poincare do sinal transmitido. Verificam­ se a aparente ausencia da modula~iio e a natureza camuflada das mensagens enviadas. Abstract:This paper describes communication with chaotic laser pulses. An information bearing signal is masked within the chaotic carrier pulses and recovered via chaos synchronization in a chaotic receiver. Two analog circuits, representing chaotic CO2 lasers, simulate the system. The chaotic pulsation from the first circuit was modulated and transmitted to the second one which behaved like a receptor, demodulating the chaotic signal through synchronism. Temporal series give power spectrum and return maps from Poincare section of transmitted signal. In these no trace of modulation is observable, which verifies the masked nature of the sent messages.

Simuation of Masked Communication with Chaotic Lasers