Self-recovery OAM mode communication system based on composite phase hologram

A communication system and hologram technology, applied in the field of self-restoring OAM mode communication system, can solve problems affecting demodulation results and expansion, and achieve the effects of improving demodulation efficiency, avoiding interference, and efficient demodulation

Pending Publication Date: 2021-05-11
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the BG beam is the same as the LG beam, and its beam radius will expand with the increase of the propagation distance, thus affecting the final demodulation result. Demodulation methods for extended effects are crucial

Method used

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  • Self-recovery OAM mode communication system based on composite phase hologram
  • Self-recovery OAM mode communication system based on composite phase hologram
  • Self-recovery OAM mode communication system based on composite phase hologram

Examples

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Embodiment 1

[0035] This example introduces in detail a specific implementation scheme in which the BG beam with the OAM mode of 1=+2 passes through the MPH in conjunction with the accompanying drawings. The generated BG beam with the OAM mode of l=+2 is incident on the spatial light modulator, and MPH is loaded on it, and through diffraction, a Gaussian bright spot appears at the position of the OAM mode value of l=-2 on the focal plane position , the vortex beam at other positions is converted into a perfect vortex, and then passed through a specially designed pinhole plate to obtain the energy distribution of the incident OAM mode, the demodulation result and the energy distribution of the OAM mode are as follows Figure 4 shown.

Embodiment 2

[0037] This example introduces in detail a specific implementation of the composite BG beam with OAM modes l=-6, +2, +6 passing through the MPH in conjunction with the accompanying drawings. We incident the composite BG beam with the OAM modes l=-6, +2, and +6 on the spatial light modulator, on which the MPH is loaded, and through diffraction, the OAM mode value is l= Gaussian bright spots appear at the positions of +6, -2, -6, such as figure 2 , the vortex beam at other positions is converted into a perfect vortex, and then passed through a specially designed pinhole plate to obtain the energy distribution of the incident OAM mode, the demodulation result and the energy distribution of the OAM mode are as follows Figure 5 shown.

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Abstract

The invention discloses a self-recovery OAM mode communication system based on a composite phase hologram. The self-recovery OAM mode communication system comprises a spatial light modulator and a Fourier lens positioned behind the spatial light modulator and used for simulating diffraction, wherein the composite phase hologram is loaded on the spatial light modulator; and the composite phase hologram receives Bessel Gaussian beams and then modulates the Bessel Gaussian beams, a diffraction process is simulated through the Fourier lens, a demodulation result is subjected to Fourier transform, and the Bessel Gaussian beams in one or more OAM modes are simultaneously demodulated according to the demodulation result and are converted into perfect vortexes at the position of a focal plane. According to the self-recovery OAM mode communication system, the generated single or multiple composite BG light beams are incident on the MPH for demodulation and then are diffracted, demodulation can be completed at the focal plane position, and the BG light beams can be converted into perfect vortexes, so that interference caused by diameter superposition of the BG light beams with different OAM mode sizes is avoided, one or multiple OAM modes can be demodulated at the same time, and the demodulation efficiency of the OAM light beam is improved.

Description

technical field [0001] The invention relates to the technical field of vortex beam free-space optical communication, in particular to a self-restoring OAM mode communication system based on a composite phase hologram. Background technique [0002] Since the vortex beams carrying different orbital angular momentums are mutually orthogonal, they can be used as a new dimension in the field of free space optical communication, which can greatly expand the channel capacity of the communication system. However, the vortex light is easily affected by obstacles during the propagation process, which affects the quality of the communication system. As a kind of non-diffraction beam, Bessel beam can restore the original light field distribution when encountering obstacles during propagation, which is of great significance for the application of vortex light in optical communication systems. However, since the ideal Bessel beam needs infinite energy to realize, this cannot be realized ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/09H04B10/11
CPCG02B27/0944G02B27/0927H04B10/11
Inventor 郭忠义龚超凡潘珍珍郭凯
Owner HEFEI UNIV OF TECH
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