Two-way high-speed free space chaos concealment secure communication method and device based on qcl

Abstract

The invention discloses a QCL-based two-way high-speed free-space chaos concealment security communication method and device, which belong to the technical field of free-space optical communication; it provides an improved scheme for a free-space high-speed mid-infrared chaotic laser security communication method; the technical scheme is: A mutual-coupled quantum cascade laser system is built at the transmitting end. The two transmitting lasers generate two-way uncorrelated broadband mid-infrared chaotic signals within the range of wavelength detuning; the two mid-infrared chaotic signals are injected into the transmitting laser and receiving The lasers are synchronized, and the mid-infrared chaotic lasers output by the two receiving lasers are C R1 (t), C R2 (t); add m to the chaotic carrier output of the two transmitters 1 (t), m 2 (t), message m 1 (t), m 2 (t) is hidden in the chaotic carrier wave, and the message is demodulated by using the chaotic filtering function of the receiving laser at the two receiving ends, so as to realize the free-space chaotic laser confidential communication.

Description

Two-way high-speed free space chaos concealment 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 chaos hiding secret communication in free space. The method and the device are specifically a QCL-based two-way high-speed free space chaos concealment security communication method and device. Background technique [0002] Free space laser communication has significant application requirements in ground battlefields and sky-earth communications (International Journal of Optics, Vol. 2015, pp. 1‑7, 2015). Compared to fiber optic communications and other wired communications, free space Laser communication has the advantages of strong flexibility, high confidentiality, low operating cost, and easy promotion. So free space laser communication It can be widely used in national electromagnetic security demanding or sensitive industries, intelligent mines, I...

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Problems solved by technology

However, at present, there is only a single-channel communication verification using the low-frequency fluctuation signal generated by optical feedback quantum cascade laser as a chaotic source, and a single-channel communication transmission with a rate of 0.5Mbit / s has been realized, which cannot meet the needs of high-speed communication (Nature Communications, Vol. .12, No.1, pp.1-8, 2021.)

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