Point-to-point optical fiber key distribution system based on scrambling

Abstract

The invention discloses a point-to-point optical fiber key distribution system based on scrambling. The point-to-point optical fiber key distribution system comprises a first light source, a first wavelength division device, a first scrambling device, a first polarizer, a first photoelectric detector, a second light source, a second wavelength division device, a second scrambling device, a secondpolarizer, a second photoelectric detector and a fiber link, wherein the first light source, the first polarizer and the first scrambling device are separately connected with the first wavelength division device; the first photoelectric detector is connected with the first polarizer; the second light source, the second polarizer and the second scrambling device are separately connected with the second wavelength division device; the second photoelectric detector is connected with the second polarizer; and the fiber link is connected between the first scrambling device and the second scramblingdevice. According to the system, polarization state disturbance is actively applied to the optical signals passing through both sides of point-to-point communication in positive and negative directions, so that the intensity of the optical signals is highly related to the polarization state, the fluctuation rate and amplitude are greatly improved, and the high code forming rate and low bit errorrate of the key can be ensured.

Description

technical field [0001] The embodiment of the present invention relates to the technical field of optical fiber key distribution, in particular to a point-to-point optical fiber key distribution system based on scrambling. Background technique [0002] As an important branch of secure communication, the generation and transmission of communication keys is the key lifeblood of the entire secure communication system, and it is also the primary target of eavesdroppers when they attack. The generation of traditional keys relies on the complexity of the algorithm or the decomposition of large numbers based on number theory so that it cannot be cracked by violence in a short period of time. However, the increasing maturity of quantum computers will make this type of encryption method face elimination in the near future. [0003] Optical fiber key distribution technology, as a low-cost, anti-electromagnetic interference physical layer key generation scheme, also has the functions of...

AI Technical Summary

Problems solved by technology

However, most of the currently proposed optical fiber key distribution schemes are based on passively imposed disturbances in the natural environment, and the key generation rate and system stability are not guaranteed. In practical applications, standard communication optical fibers are usually wrapped in optical cables. , it is difficult to achieve the effect obtained in the laboratory

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