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High-dimensional digital signal coding and decoding method and system based on multicyclic vortex beam

A codec method and vortex beam technology, which are applied in the field of high-dimensional digital signal codec method and system, can solve the problems of increased detection range, complicated technology, difficult implementation, etc., and achieve simple structure, improved coding efficiency, and easy adjustment Effect

Active Publication Date: 2018-10-16
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Claims
  • Application Information

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Problems solved by technology

From the perspective of vortex beam generation and detection, it is technically complicated to first generate a high-order high-purity vortex beam (such as |l|>100)
Second, the receiving end of the system must be able to recognize the 2 B OAM state, with the increase of the number of coded bits B, the OAM state detection interval of the detection system at the receiving end will also increase, which is not easy to achieve in the prior art

Method used

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  • High-dimensional digital signal coding and decoding method and system based on multicyclic vortex beam
  • High-dimensional digital signal coding and decoding method and system based on multicyclic vortex beam
  • High-dimensional digital signal coding and decoding method and system based on multicyclic vortex beam

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Effect test

Embodiment 1

[0047] Embodiment 1: Free space transmission of 5000 random 64 code elements

[0048] In this embodiment, 5000 64-ary numbers are randomly generated, and the transmitter passes through 16 OAM states (l=-9,-8,-7,-6,-4,-3,-2,-1, 1, 2, 3, 4, 6, 7, 8, 9) and 4 radial quantum numbers (p = 0, 1, 2, 3) for 6-bit multi-ring vortex beam encoding, the total amount of information after encoding is 30 kilobits. After being transmitted in free space, it is received and decoded by the receiver. The decoded 5000 hexadecimal numbers are exactly the same as the 5000 random hexadecimal numbers encoded by the transmitter, and the bit error rate is 0.

Embodiment 2

[0049] Example 2: Free-space transmission of 64×64 grayscale images

[0050] In this embodiment, a grayscale image is transmitted in free space by using the same 6-bit multi-ring vortex beam coding as in Embodiment 1. The selected grayscale image is a 64×64 pixel Beijing Institute of Technology logo, and the image size is 32.768 kilobits. Figure 6(a) and Figure 6(b) respectively show the grayscale picture encoded and transmitted by the transmitter and the picture decoded by the receiver after transmission in free space using 6-bit multi-ring vortex beam encoding. The experimental results show that the bit error rate of grayscale pictures transmitted by 6-bit multi-ring vortex beam coding transmission is 0, and the pictures demodulated by the receiver after transmission are exactly the same as those coded and modulated by the transmitter.

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Abstract

The invention discloses a high-dimensional digital signal coding and decoding method and a high-dimensional digital signal coding and decoding system based on a multicyclic vortex beam. According to the method and system provided by the invention, two mutually independent dimensions, the orbital angular momentum and the radial quantum number of the multicyclic vortex beam simultaneously serve as coding features for performing high-dimensional coding of a digital signal, so that the coding efficiency is further enhanced under the condition of using the limited orbital angular momentum. In addition, according to the method and system provided by the invention, both the coding and decoding of the digital signal based on the multicyclic vortex beam can be achieved via a diffraction grating, the system is simple in structure and easy to control, and has relatively large progress compared with the prior art.

Description

Technical field: [0001] The invention relates to the field of optoelectronic technology, in particular to a method and system for encoding and decoding high-dimensional digital signals based on multi-ring vortex beams. Background technique: [0002] The vortex beam is a new type of structured beam, which has a helical wavefront structure, and the complex amplitude contains a helical phase factor Where l is the angular quantum number, which can take any integer; is the angular coordinate. The helical phase of the vortex beam makes the center of the beam have a phase singularity, which makes the cross-sectional light intensity distribution present a ring shape. Studies have shown that each photon in the vortex beam carries an orbital angular momentum (OAM), whose value is ( to reduce the Planck constant), so the vortex beam is also called the beam carrying the OAM (OAM beam). The angular quantum number l of the vortex beam is the eigenvalue of the vortex beam, which d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/516H04B10/61H04B10/67H04B10/69G02B5/18
CPCG02B5/18G02B2005/1804H04B10/516H04B10/615H04B10/67H04B10/6933
Inventor 高春清付时尧
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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