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Orbital angular momentum (OAM) coherent demultiplexing device and separation detection method

A technology of orbital angular momentum and demultiplexing, which is used in multi-mode transmission, optical fiber transmission, electromagnetic receivers, etc., to achieve the effect of improving transmission distance, easy implementation, and improving bit error performance.

Active Publication Date: 2017-05-31
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, in the prior art, there is no effective detection method for long-distance OAM multiplexing communication systems

Method used

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  • Orbital angular momentum (OAM) coherent demultiplexing device and separation detection method
  • Orbital angular momentum (OAM) coherent demultiplexing device and separation detection method
  • Orbital angular momentum (OAM) coherent demultiplexing device and separation detection method

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Embodiment 1

[0058] figure 1 It is the simplest application solution based on the present invention, and the devices included in the solution include: a beam splitter 1, a mirror 2, a liquid crystal spatial light modulator 3, a phase shifter 4, a photodetector 5 and a differential circuit 6; The mirror 2, two beam splitters 1 and a phase shifter 4 can form a coherent separation unit 7 .

[0059] The beam splitter 1 is mainly used to split the incident light beam, the liquid crystal spatial light modulator is mainly used to convert the vortex light into fundamental mode Gaussian light; the reflector 2 is mainly used to adjust the light Propagation direction and realization of odd number of reflections of light; the coherent separation unit is mainly used to separate the OAM channel of a certain specific topological charge from other OAM channels; the photodetector 5 is mainly used to realize photoelectric conversion; The above differential circuit 6 is mainly used for current subtraction. ...

Embodiment 2

[0076] further, such as image 3 As shown, the number of multiplexed orbital angular momentum is increased to 4, and the included devices are: beam splitter 1, mirror 2, liquid crystal spatial light modulator 3, phase shifter 4, photodetector 5 and differential circuit 6; A coherent separation unit 7 can be formed by using three mirrors 2 , two beam splitters 1 and one phase shifter 4 .

[0077] The beam splitter 1 is mainly used to split the incident light beam, and the liquid crystal spatial light modulator (the spatial light modulator selected here can also be replaced by a spiral phase plate or a fork grating) is mainly used to Convert vortex light into fundamental mode Gaussian light; the reflector 2 is mainly used to adjust the propagation direction of light and realize the odd number of reflections of light; the coherent separation unit is mainly used to realize the OAM channel of a specific topological charge Separation from other OAM channels; the photodetector 5 is ...

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Abstract

The invention discloses an orbital angular momentum (OAM) coherent demultiplexing device and a separation detection method. The device comprises a beam splitter for carrying out beam splitting on incident beams, a reflector for adjusting the light propagation direction and realizing an odd number of times of light reflection, a liquid crystal spatial light modulator for converting vortex beams with specific topological load to fundamental-mode Gaussian beams, a coherent separation unit for realizing separation between an OAM channel with certain specific topological load and other OAM channels, a phase shifter for realizing phase shift pi of beams, a photoelectric detector for realizing photoelectric conversion, and a differential circuit for subtraction operation on current. The device of the invention is used for realizing OAM coherent separation detection. The novel device provided by the invention can enhance the detection performance of the existing free-space optical orbital angular momentum multiplexing communication system and the transmission distance, and an important application prospect is realized in fields of optical communication in a vortex field and information processing.

Description

technical field [0001] The invention relates to the field of vortex light field in the technical field of optics, in particular to a device for coherent demultiplexing of orbital angular momentum and a method for separation and detection. Background technique [0002] Orbital angular momentum is an important physical quantity in classical mechanics and quantum mechanics. The angular momentum of particles includes orbital angular momentum (OAM) and spin angular momentum. OAM is often related to spatial distribution. In 1992, Allen first discovered that the helical phase beam has OAM, and this type of beam has a phase factor of exp(ilθ), where l represents the topological charge, θ is the angular component, and each photon carries OAM, In order to reduce Planck's constant, since theoretically l has an infinite orthogonal interval, and beams with different l values ​​are orthogonal to each other, OAM is introduced into optical communication as a new degree of freedom, which ...

Claims

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Application Information

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IPC IPC(8): H04B10/2581H04B10/61
CPCH04B10/2581H04B10/61
Inventor 李瑛贺炎亮张小科蔡瑶唐进陈书青范滇元
Owner SHENZHEN UNIV
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