Chaotic quadrature multiplexing secure optical fiber communication device and method

Abstract

The invention provides a chaotic quadrature multiplexing secure optical fiber communication device and method. Information is combined together with DC offset signals of lasers into one signal after passing through bias devices, and then the signal enters the lasers; chaotic light generated by the N lasers is combined into one signal after passing through an optical coupler, and the signal is then split into N+1 paths by the optical coupler, N paths are fed back to the lasers by optical fiber delay lines and optical circulators, and the rest one path enters optical fiber transmission; the signal passing through the optical coupler is divided into N+1 paths, the N paths respectively enter the N lasers, while the rest one path directly enters a photoelectric detector; the outputs of the lasers of a receiver are respectively sent to anti-phase photoelectric detectors; output signals of all the photoelectric detectors are combined into one signal by an RF (Radio Frequency) coupler, which is then sent to bandpass filters; and the parameters of the filters can be adjusted to obtain demodulated information. According to the invention, the dimensionality of optical fiber multiplexing communication is increased, the amount of multiplexing channels is increased and the optical fiber bandwidth can be made the best use of.

Description

technical field [0001] The invention belongs to the field of optical fiber communication, and relates to a chaotic orthogonal multiplexing secure optical fiber communication device and method, in particular to an all-optical chaotic orthogonal multiplexing secure communication device using a distributed feedback semiconductor laser, belonging to information security, military and Optical fiber communication technology field. Background technique [0002] Information security has become a national security strategy that cannot be ignored, which is related to national political, economic, military and social security, stability and development. The problems of data information loss, leakage or illegal tampering during network transmission, storage, and processing have become increasingly serious in recent years, and have had a serious impact on society and the economy. There is no doubt that the security of communication has important practical needs and long-term strategic s...

AI Technical Summary

Problems solved by technology

Its shortcoming is that the device cannot be realized in an optical fiber environment, and there is no method for loading and demodulating information

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