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A Spatial Optical Communication System Without Precise Alignment

A space optical communication, precise alignment technology, applied in the field of optical communication, can solve the problems of reducing the stability and reliability of long-distance optical communication, increasing the complexity of the communication system, etc., to ensure long-distance communication capability, suppress background interference, The effect of reducing alignment accuracy

Active Publication Date: 2016-04-06
EAST CHINA NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, free-space optical communication requires high-precision point-to-point alignment, which reduces the stability and reliability of long-distance optical communication and increases the complexity of the communication system

Method used

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  • A Spatial Optical Communication System Without Precise Alignment
  • A Spatial Optical Communication System Without Precise Alignment
  • A Spatial Optical Communication System Without Precise Alignment

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Embodiment

[0016] refer to figure 1 , the present invention includes an optical signal transmitting unit A, an optical signal receiving unit B, and an aiming unit C that aligns the signal beam with the optical signal receiving unit; the optical signal transmitting unit A includes an encoding module 1, a laser modulation drive module 2, and an 850nm laser 3 and the beam collimator beam expander 4; wherein the encoding module 1 is composed of a high-speed FPGA board, which encodes the data information to be transmitted into a digital pulse sequence with a clock frequency of 2MHz; the digital pulse sequence triggers the laser modulation drive module 2 to drive The 850nm laser 3 generates an optical pulse sequence, and the 850nm laser 3 is a fiber-coupled VCSEL laser. The outgoing light pulse passes through the optical fiber and directly enters the optical fiber-coupled beam collimator 4 to obtain an emitted beam with a divergence angle of 0.015°. The power is 6*10 -12 J, the number of phot...

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PUM

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Abstract

The invention discloses a space optical communication system without accuracy alignment. The system comprises an optical signal emitting unit, an optical signal receiving unit and an aiming unit for aligning signal beams to the optical signal receiving unit. The aiming unit comprises a target position marking portion and an emitting angle adjusting portion. The optical signal emitting unit is fixed to the emitting angle adjusting portion of the aiming unit. The optical signal receiving unit is close to the target position making portion of the aiming unit. According to the space optical communication system, a laser light source with the large divergence angle is adopted, no optical receiving lens is adopted, laser spots are made to directly cover the target surface of a detector, and therefore the requirement for alignment accuracy is greatly lowered; a multi-channel single-photon detector is adopted for detecting optical signals, the receiving sensitivity can reach the single-photon level, and optical losses caused by large-divergence-angle laser and optical losses caused when no optical receiving device exists are overcome.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and relates to free-space point-to-point optical communication technology based on single-photon detectors, in particular to a space optical communication system that does not require precise alignment to realize long-distance optical communication at the single-photon level. Background technique [0002] Free space optical communication, also known as wireless optical communication, is a communication technology that uses light waves as information carriers to transmit information in the atmosphere and vacuum, and can be divided into atmospheric optical communication, inter-satellite optical communication and satellite-ground optical communication. At present, free-space optical communication requires high-precision point-to-point alignment, which reduces the stability and reliability of long-distance optical communication and increases the complexity of the communication system. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/07H04B10/11G01J11/00
Inventor 吴光师亚帆冯百成鲍泽宇李召辉杜秉乘颜佩琴
Owner EAST CHINA NORMAL UNIV
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