Abstract
To solve the security problem of information transmission, we add a more complex key of variable RF amplifier gain to enhance the confidentiality of the chaotic optical communication system. In the system, the RF amplifier gain is variable. The numerical results indicate that the bit error rate of the eavesdropper is much higher than that of the authorized receiver. And the eavesdropper cannot decrease the BER by decreasing the mismatch of other parameters in the electro-optic oscillator gain. Such system can be used to realize communication with high level of privacy in the future.
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