Physical layer secret optical fiber communication system based on chaotic phase encryption

Abstract

The invention discloses a physical layer secret optical fiber communication system based on chaotic phase encryption, and the system comprises the steps: dividing a broadband random light source generated by a main laser into two identical optical signals, and respectively injecting the two optical signals into slave lasers of two communication sides, thereby generating a synchronous chaotic signal; and then the generated synchronous chaotic signal is used as a phase modulator driving signal, and high-speed optical signals generated by high-order modulation are encrypted and decrypted at a sending end and a receiving end.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and more specifically relates to a physical layer security optical fiber communication system based on chaotic phase encryption. Background technique [0002] With the rise of the Internet age and the rapid development of information technology, people have higher and higher requirements for efficient and fast information transmission carriers and technologies. Due to its large communication capacity, long transmission distance, good transmission quality, and less crosstalk between signals, optical fiber communication has become the leading transmission technology for information networks in the 21st century. However, while optical fiber communication brings great convenience to people, its openness and sharing characteristics also make information security problems increasingly severe. How to improve the security of optical fiber communication systems has become a hot research issu...

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Problems solved by technology

[0004] However, after in-depth research, scholars have found that the chaotic laser generated by the external cavity semiconductor laser has safety defects. Due to the existence of the external cavity resonance, the autocorrelation curve of the generated chaotic signal has an obvious correlation peak at the external cavity period. It is called a time-delay tag. The time-delay tag leaks the length of the external cavity, so that the interceptor can use this key structural information to reconstruct the chaotic carrier signal, and then crack the transmitted information, weakening the security of the communication system.

On the other hand, the inherent relaxation oscillation of external cavity semiconductor lasers leads to chaotic laser bandwidth of only a few GHz. In chaotic optical communication, chaotic laser is used as a carrier to hide the transmitted optical information. The limited chaotic carrier bandwidth limits the transmission of chaotic optical communication. rate, making it difficult to be compatible with existing high-speed fiber optic communication systems

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