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Coded optical communication method and system based on composite vortex beam

A composite vortex and communication method technology, applied in the field of optical communication, can solve problems such as difficult reception and demodulation, difficulty in generating vortex beams, etc., and achieve the effects of improving reliability, enhancing accuracy, and increasing channel capacity

Pending Publication Date: 2022-06-03
SHANDONG NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, vortex beams with large topological charges are difficult to generate and not easy to receive and demodulate

Method used

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  • Coded optical communication method and system based on composite vortex beam
  • Coded optical communication method and system based on composite vortex beam
  • Coded optical communication method and system based on composite vortex beam

Examples

Experimental program
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Embodiment 1

[0036] like figure 1 As shown, this embodiment provides a method for coded optical communication based on the orbital angular momentum and phase of a composite vortex beam, including:

[0037] By adjusting the orbital angular momentum and phase difference of the Laguerre Gaussian beam, the Laguerre Gaussian beams with different orbital angular momentum are superimposed in the phase difference mode to encode the digital signal to be transmitted into a composite vortex beam;

[0038] The phase power spectrum of the random phase screen is obtained from the power spectrum of the simulated atmospheric turbulence to construct the atmospheric turbulence phase screen;

[0039] The simulation of composite vortex beam transmission is carried out through the atmospheric turbulence phase screen, and the light spot after the composite vortex beam transmission is obtained, and the trained decoder is used to decode the light spot to obtain the digital signal to be transmitted.

[0040] In t...

Embodiment 2

[0076] This embodiment provides an encoded optical communication system based on a compound vortex beam, including:

[0077] The encoding module receives the Laguerre Gaussian beam, and is used to superimpose the Laguerre Gaussian beams with different orbital angular momentum in the phase difference mode by adjusting the orbital angular momentum and phase difference of the Laguerre Gaussian beam, so as to convert the digital data to be transmitted The signal is encoded as a composite vortex beam;

[0078] The transmission simulation module is used to obtain the phase power spectrum of the random phase screen from the power spectrum of the simulated atmospheric turbulence, so as to construct the atmospheric turbulence phase screen, and simulate the transmission of the composite vortex beam through the atmospheric turbulence phase screen;

[0079] The decoding module receives the light spot transmitted by the compound vortex beam, and uses the trained decoder for decoding accord...

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Abstract

The invention discloses a coded optical communication method and system based on a composite vortex beam, and the method comprises the steps: superposing Laguerre-Gaussian beams with different orbital angular momentums in a phase difference mode through adjusting the orbital angular momentums and the phase difference of the Laguerre-Gaussian beams, so as to code a to-be-transmitted digital signal into a composite vortex beam; the phase power spectrum of the random phase screen is obtained through the simulated atmospheric turbulence power spectrum, so that the atmospheric turbulence phase screen is constructed; simulation of composite vortex light beam transmission is carried out through the atmospheric turbulence phase screen, a light spot after composite vortex light beam transmission is obtained, and the light spot is decoded through the trained decoder to obtain a digital signal to be transmitted. Laguerre Gaussian beams with different orbital angular momentums are superposed to form a composite vortex beam, and the superposed light intensity is changed by regulating and controlling the phase difference between the vortex beams, so that the channel capacity of communication is improved by using limited topological charge, the decoding accuracy is enhanced, and the reliability of an optical communication system is improved.

Description

technical field [0001] The present invention relates to the technical field of optical communication, in particular to a method and system for coded optical communication based on compound vortex beams. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] With the development of information technology and the emergence of technologies such as the Internet of Things, big data, and metaverse, people's demand for data has increased dramatically. The contradiction between the rapidly increasing spectrum demand and limited spectrum resources is becoming more and more prominent, and a new high-speed, large-capacity, and high-stability communication system is urgently needed to improve spectrum efficiency and expand channel capacity. The vortex beam has a helical wavefront phase, its helical phase exp(ilθ), (l is the topological charge or orbital ang...

Claims

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Application Information

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IPC IPC(8): H04B10/116H04B10/516H04B10/50H04J14/00H04J14/06H04L1/00G02B27/28
CPCH04B10/116H04B10/516H04B10/50597H04L1/0009H04J14/007H04J14/06G02B27/286Y02D30/70
Inventor 魏冬梅陈涛刘芳宁杜乾刘娟
Owner SHANDONG NORMAL UNIV
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