Quantum communication system compatible with laser communication

A technology of laser communication and quantum communication, applied in the field of satellite-to-earth optical communication, can solve problems such as high technical difficulty and high cost

Active Publication Date: 2011-09-21
上海国科航星量子科技有限公司
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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 dif

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  • Quantum communication system compatible with laser communication
  • Quantum communication system compatible with laser communication

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Embodiment Construction

[0021] Attached below figure 1 A specific example of the present invention is given. In this example, quantum communication uses single photons with a wavelength of 850nm, and laser communication uses communication light with a wavelength of 1550nm. The optical telescope is designed as an achromatic transmission telescope. The rough tracking turntable is driven by two stepper motors, and the optical telescope and the entire rear optical path are installed on the rough tracking turntable. The rough tracking turntable controls the azimuth and pitch rotation of the optical telescope according to the orbital position of the satellite and the position of the ground station, and completes the coarse pointing of the optical telescope on the satellite to the ground communication terminal. On the rear optical path of the telescope, the fine-tracking fast pointing mirror is composed of a voice coil motor and a plane mirror fixed on it. This example adopts the FSM330 voice coil motor ...

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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...

Claims

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Application Information

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IPC IPC(8): H04B10/30H04B10/70
Inventor 王建宇江昊贾建军张亮强佳吴金才张明钱锋
Owner 上海国科航星量子科技有限公司
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