Quantum communication system compatible with laser communication

Abstract

The invention discloses a satellite-to-ground quantum communication system compatible with classic laser communication. When completing the establishing of a communication link with a ground terminal and carrying out satellite-to-ground quantum communication, the system used as a satellite load can perform satellite-to-ground classic laser communication with the same ground terminal at the same time. The invention also discloses a device for realizing satellite-to-ground quantum communication and laser communication simultaneously. The device comprises an optical telescope, a rough tracking turntable, a fine tracking quick pointing mirror, a color separation film, a quantum communication narrow bandpass filter, a quantum communication module, a splitting prism, a fine tracking camera, a laser communication narrow bandpass filter and a laser communication module; based on a wavelength difference between single photons for quantum communication and signal light for classic laser communication, the color separation mirror is used for performing special separation on the single photons and the signal light so as to design a reasonable and feasible light-machine structure; and thus, satellite-to-ground quantum communication and laser communication can be realized simultaneously by using one set of optical transmit-receive system and tracking and scanning system.

Description

technical field [0001] The invention relates to the field of satellite-to-earth optical communication, in particular to a quantum communication system compatible with classical laser communication. The system can enable the satellite to simultaneously perform quantum communication and laser communication with the ground terminal through the same set of optical transceiver system and tracking and targeting system (including rough tracking and fine tracking). Background technique [0002] Both satellite-to-ground quantum communication technology and satellite-to-ground laser communication technology are the hotspots of current international new technology research. At present, many countries are planning to develop laser communication satellites and quantum communication satellites, and carry out satellite-to-ground laser communication and quantum communication experiments. . [0003] The difference between classical laser communication and quantum communication lies in its c...

AI Technical Summary

Problems solved by technology

Due to the huge cost of satellite loads, especially the large-caliber optical transceiver and high-precision capture, tracking and targeting device, its realization has high technical difficulty and requires a lot of manpower and material resources; at the same time, space resources, power resources and and Orbital time resources between ground stations are very valuable

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