Chaotic secret optical communication system based on dual-drive Mach-Zehnder modulator

Abstract

The invention provides a chaotic secret optical communication system based on a dual-drive Mach-Zehnder modulator. The system comprises a sending end, a fiber transmission link and a receiving end, wherein the sending end sends signals to the receiving end through the fiber transmission link; and the sending end is used for sending information signals and chaotic signals, and the receiving end is used for decrypting received signals. According to the invention, based on the dual-drive Mach-Zehnder modulator, the information signals are hidden in electric chaotic signals, and since the synchronization feature of the electric chaotic signals is superior to that of optical chaotic signals, synchronization of the secret communication system can be easily realized; and through integrated utilization of an electric time-delay line, electric attenuators and the like, the secret key space of the secret optical communication system is increased, the invisibility of the information signals is improved, and the anti-decryption performance of the system is enhanced. Besides, the system has high universality and is applied to information signals in various modulation formats.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a chaotic security optical communication system based on a dual-drive Mach-Zehnder modulator. Background technique [0002] With the exponential growth of Internet traffic and bandwidth requirements, optical fiber communication network has become an important communication tool in modern high-speed data transmission network. In addition, the privacy protection and information security requirements of network users and military users have greatly increased, so the confidentiality of optical fiber communication systems has become the focus of the industry. The current application and research are mainly aimed at improving the security of the media access control layer to improve network security, while there are fewer studies on the vulnerable physical layer. [0003] In order to enhance the security of the physical layer of optical communication system, based on the...

AI Technical Summary

Problems solved by technology

However, a series of security loopholes have been discovered during the research and development process, and the delay time in the feedback loop is easy to be cracked, that is, the synchronization problem of chaotic optical signals

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