QCL-based dual-channel high-speed free-space chaotic keying secure communication method and device

Abstract

The invention discloses a QCL-based dual-channel high-speed free-space chaotic keying security communication method and device, which belong to the technical field of free-space optical communication; it provides an improved plan for a free-space mid-infrared chaotic keying security communication method, which improves the current There is a communication rate for mid-infrared space optical security communication; the technical solution is: through the mutual coupling structure of quantum cascade lasers, the parameters are adjusted to generate two-way uncorrelated broadband chaotic signals; the two-way lasers are unidirectionally injected into two corresponding parameters One-way receiving laser; the digital information is encoded by the change of the current injected into the receiving end by the transmitting end near the bias current, and the detectors are used to collect the signals of the transmitting end and the receiving end in the two paths respectively, and the chaotic synchronization between the transmitting laser and the receiving laser is used The state is subtracted to realize information demodulation, and to realize high-speed secure communication of infrared chaotic keying in free space.

Description

Two-way high-speed free space chaotic keying secure communication method and device based on QCL technical field The invention belongs to the free space optical communication technical field, relate to the infrared chaotic keying secret communication in free space. Method and device; in particular, a QCL-based dual-channel high-speed free-space chaotic keying secure communication method and device. Background technique [0002] The recent development of space optical communication is faster and more economical in deployment compared to optical fiber communication. Radio waves have higher bandwidth, and are replaced by campus-wide network communications and post-disaster optical fiber communications networks, connecting drone coverage Communication white spot and private communication have very broad application prospects. In space communications, large amounts of data travel through the atmosphere Channel propagation, information is easy to be captured, and encrypted ...

AI Technical Summary

Problems solved by technology

However, at present, quantum cascade lasers can only generate low-frequency fluctuations (LFF) through optical feedback. Although low-frequency fluctuations have chaotic characteristics, their bandwidth is small and cannot meet the needs of high-speed communication. Currently, only a rate of 0.5Mbit / s, one-way communication transmission [Nature Communications, Vol.12, No.1, pp.1-8, 2021.]

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