A Secure Optical Communication System Based on Phase-Amplitude Conversion

Abstract

The invention discloses a phase-amplitude conversion based secure optical communication system, and belongs to the technical field of secure communication. The phase-amplitude conversion based secureoptical communication system is to convert a noise signal at a phase to an amplitude so as to realize masking encryption for the data signal at the amplitude through the phase-amplitude conversion; compared with the traditional noise secure optical communication system, the phase-amplitude conversion based secure optical communication system can decrypt through the phase-amplitude conversion, is not required to filter a masking signal, has an unlimited signal rate, has the masking signal not required to be transmitted in a link and can greatly improves the security of the encryption system; meanwhile, the system is subjected to secondary encryption through the photoelectric feedback circuit, increases the key space by introducing time delay, increases the key space dimension by a dispersion element in the system and realizes time delay masking. Compared with the traditional chaotic secure optical communication system, the system has higher key dimension and bigger key space.

Description

technical field [0001] The invention belongs to the technical field of security communication, and more specifically relates to a secure optical communication system based on phase-amplitude conversion. Background technique [0002] As the application of optical communication becomes more and more common, the security issues in optical communication become more and more important. In terms of optical communication security, the security optical communication system based on the physical layer has become a research hotspot. At present, there are mainly two kinds of security optical communication systems: chaos security optical communication system and noise security optical communication system. Chaotic security optical communication system can generate broadband noise-like signal sensitive to initial value to cover and encrypt data information in amplitude or phase. However, in practical applications, the synchronization robustness of chaotic secure optical communication s...

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Problems solved by technology

[0003] In view of the above defects or improvement needs of the prior art, the present invention provides a secure optical communication system based on phase-amplitude conversion, the purpose of which is to convert the noise signal on the phase to the noise signal on the amplitude on the amplitude through the phase-amplitude conversion The data signal is concealed and encrypted; the second encryption is carried out through the electro-optic feedback loop, and the delay is introduced to increase the key space; thereby solving the problem of potential safety hazards in the existing communication security technology

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