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Partial reception method for orbital angular momentum mode demultiplexing

An orbital angular momentum and mode demultiplexing technology, applied in the field of orbital angular momentum mode beam reception, can solve the problems of limiting the number of channels in a multi-channel orbital angular momentum multiplexing system, and the limited size of receiver aperture, so as to improve the communication spectrum. Utilization, reduce crosstalk, reduce the effect of preparation

Active Publication Date: 2015-05-13
ZHEJIANG UNIV
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AI Technical Summary

Problems solved by technology

In fact, the aperture size of any receiver is finite, and this property limits the number of channels in a multi-channel orbital angular momentum multiplexing system

Method used

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  • Partial reception method for orbital angular momentum mode demultiplexing
  • Partial reception method for orbital angular momentum mode demultiplexing
  • Partial reception method for orbital angular momentum mode demultiplexing

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Embodiment Construction

[0012] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0013] figure 1 Models for complete reception and partial reception are given. In the plane perpendicular to the main axis of orbital angular momentum beam propagation, figure 1 (a) is a complete receiving model, that is, receiving the energy of the entire angular direction (0-2π); figure 1 (b) is a partial reception. Only receive energy within the angular range (0~β). Obviously, partial reception can greatly reduce the volume of the receiving end and other comprehensive costs.

[0014] For a phase factor The orbital angular momentum beam of , the field of orbital angular momentum radiated in space can be expressed as:

[0015]

[0016] where ρ, z are the radial direction, circumferential direction and axial direction in the cylindrical coordinate system, respectively. At the receiving end, it is necessary to use a device with opposite phase distribution ...

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Abstract

The invention discloses a partial reception method for an orbital angular momentum mode demultiplexing. A partial reception bore is 1 / n of the whole bore circumference needed by complete reception, a plurality of orbital angular momentum multiplexing wave beams comprising a group of orbital angular momentum topological charges li meeting a certain rule are selected, the topological charges li meet li=l+nm, the l refers to an optional orbital angular momentum topological charge, the m is an integer, the n is an integer larger than or equal to 2, the orbital angular momentum multiplexing wave beams are mutually orthogonal, the 1 / n partial reception bore is used for receiving at a receiving end, and low-crosstalk orbital angular momentum mode demultiplexing can be realized.

Description

technical field [0001] The invention relates to the field of receiving orbital angular momentum mode beams, in particular to a partial receiving method for orbital angular momentum mode demultiplexing. Background technique [0002] Today's communication systems are facing many challenges, and spectrum resources are severely lacking. In order to improve the communication rate, even if high-density coding and channel sharing technology are applied, this problem still cannot be solved fundamentally. A method that can efficiently improve the spectrum efficiency has been proposed. Electromagnetic wave communication carrying orbital angular momentum (OAM) has received a lot of attention. Orbital angular momentum is the basic physical property of electromagnetic waves, which reflects the phase change parameters of electromagnetic waves around the azimuth direction of the propagation direction axis. For electromagnetic waves of any frequency, the topological charges of orbital an...

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Application Information

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IPC IPC(8): H04B10/60
Inventor 郑史烈章献民金晓峰池灏
Owner ZHEJIANG UNIV
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