Wireless optical communication atmospheric turbulence resisting method based on OAM mode hopping

A technology of wireless optical communication and atmospheric turbulence, applied in the field of wireless optical communication, can solve the problems of difficult adjustment of system parameters, complex structure, high cost, etc., achieve the effect of simple optical path, increase system weight and volume, and improve performance

Active Publication Date: 2021-09-17
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a wireless optical communication based on OAM mode hopping for the shortcomings of the existing wireless optical communication system anti-atmospheric turbulence module, such as large volume, complex structure, high cost, and difficulty in real-time adjustment of system parameters according to weather conditions. anti-atmospheric turbulence method

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  • Wireless optical communication atmospheric turbulence resisting method based on OAM mode hopping
  • Wireless optical communication atmospheric turbulence resisting method based on OAM mode hopping
  • Wireless optical communication atmospheric turbulence resisting method based on OAM mode hopping

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with accompanying drawing of description:

[0034] figure 1 It is a schematic diagram of the wireless optical communication system based on OAM mode-hopping anti-atmospheric turbulence technology, from left to right: optical modulator 1, high-speed optical switch 2, collimator 3, spiral phase plate array 4, vortex grating 5, and transmitting antenna 6. Receiving antenna 7, optical receiver 8. The optical transmitter sends out the modulated Gaussian beam, and the optical switch switches the corresponding channel according to the mode-hopping sequence at the mode-hopping rate set by the system. The vortex beam is coupled into the transmitting antenna by the vortex grating for transmission. The receiving antenna couples the received light beam into the optical receiver, and the optical receiver demodulates the received optical signal to obtain the original information.

[0035] figure 2 A schematic d...

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Abstract

The invention belongs to the field of wireless optical communication, and discloses a wireless optical communication atmospheric turbulence resisting method based on OAM mode hopping. The high-speed optical switch gates a modulated Gaussian beam to different spiral phase plates, the spiral phase plates convert the Gaussian beam into a vortex beam, and in each symbol period, the topological charge of OAM is changed for multiple times, so that the performance can be improved. According to the atmospheric turbulence resisting method, the spatial dimension of light is modulated, the structure is simple, a mode with good turbulence resisting performance can be selected in real time, the mode hopping rate can be dynamically adjusted, the problem that turbulence of different intensities cannot be adapted due to a fixed emission mode is avoided, the method is easily combined with an existing wireless optical communication system, the weight and the size of the system are not obviously increased, and optical power fluctuation caused by atmospheric turbulence can be effectively reduced.

Description

technical field [0001] The invention relates to the field of wireless optical communication, and further relates to an anti-atmospheric turbulence method for wireless optical communication based on OAM mode hopping. Background technique [0002] There are vortex motions of various scales in the atmosphere, manifested as temporal discontinuity and spatial inhomogeneity of the velocity field, called atmospheric turbulence. Atmospheric turbulence will cause laser beam divergence, drift, intensity fluctuation, spatial decoherence, etc., which will reduce the quality of received signals in wireless optical communication systems, resulting in increased bit error rates, decreased link stability, and even communication interruptions. Therefore, improving the anti-atmospheric turbulence performance of the wireless optical communication system has very important application value and practical significance. [0003] At present, the methods to improve the anti-atmospheric turbulence p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/11H04B10/112H04B10/516H04B10/61
CPCH04B10/11H04B10/1129H04B10/516H04B10/616Y02D30/70
Inventor 雷兵刘建仓蔡钰波
Owner NAT UNIV OF DEFENSE TECH
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