QCL-based two-way high-speed free space chaos keying secret communication method and device

Abstract

The invention discloses a QCL-based two-way high-speed free space chaos keying secret communication method and device, and belongs to the technical field of free space optical communication. The invention provides an improved scheme of a free space mid-infrared chaos keying secret communication method, and the communication rate of existing mid-infrared space light secret communication is improved. According to the technical scheme, through a mutual coupling structure of a quantum cascade laser, parameters are regulated and controlled to generate two paths of uncorrelated broadband chaotic signals; the two lasers are respectively injected into the two receiving lasers with consistent corresponding parameters in a one-way manner; the digital information is coded through change of current injected into a receiving end by a transmitting end near bias current, transmitting end and receiving end signals in two paths are respectively collected by a detector, and information demodulation is realized through subtraction by utilizing a chaotic synchronization state between a transmitting laser and a receiving laser, and the information demodulation is realized by subtraction. The infrared chaos keying high-speed secret communication in the free space is realized.

Description

technical field [0001] The invention belongs to the technical field of free space optical communication, and relates to a method and device for infrared chaotic keying secure communication in free space; specifically, it is a QCL-based two-way high-speed free space chaotic keying secure communication method and device. Background technique [0002] Recently, space optical communication has been continuously developed. Compared with optical fiber communication, it can be deployed faster and more economically. Compared with radio waves, it has higher bandwidth. It can be replaced by campus-wide network communication, post-disaster optical fiber communication network, and connected drone coverage. There are very broad application prospects in communication white point and private communication. In space communication, a large amount of data is transmitted through the atmospheric channel, and information is easily captured. Encrypting information to ensure information security a...

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.]

Images