Submarine Communication System Based on Continuous Variable Quantum Key Distribution and Its Implementation Method

Abstract

The invention discloses a continuous variable quantum key distribution based submarine communication system and an implementation method thereof, and belongs to the technical field of underwater communication. Through the cooperation of a system modulated by a first laser, a first electro-optic intensity modulator, a second electro-optic intensity modulator, a first electro-optical phase modulator, an attenuator and a first collimator of a sending end, optical signals can be output and enter a receiving end; and a second laser generates local vibration light which can enter a homodyne detectorwith the optical signals output by the sending end to perform detection through the modulation of a third electro-optic intensity modulator and a second electro-optical phase modulator, so that a safe key can be established within an effective distance. The system and method apply a continuous variable quantum key distribution technology to free space submarine communication, so that the weaknessof simple underwater optical communication with short distances can be overcome, and system security can be guaranteed; and a point to point transmission mode for free space equipment and underwaterequipment and an information transmission mode between multiple underwater equipment which takes the free space equipment as transfer stations can be provided.

Description

Technical field[0001]The invention belongs to the technical field of underwater communication, and particularly relates to a submarine communication system based on continuous variable quantum key distribution and an implementation method thereof.Background technique[0002]Underwater communication technology is widely used in marine exploration, military communications and other fields. Traditional underwater communication is realized by acoustic wave technology. Acoustic technology has many inherent defects, such as low bandwidth, easy expansion, high delay, and low security. Modern underwater communication has gradually begun to adopt optical communication technology. Optical communication has the advantages of high frequency band and good directivity, but it also has shortcomings that are difficult to overcome. Since the attenuation of light propagating in water is much higher than that of free space and optical fibers, underwater optical communication systems can often only opera...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a submerged communication system based on continuous variable quantum key distribution and its implementation method, combined with continuous variable quantum key distribution technology, free space optical communication technology and underwater optical communication technology, to solve the existing problems The underwater optical communication technology has the problems of limited distance and unsafe communication system, so as to realize a long-distance and safe submarine communication system

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