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OAM channel extraction and addition system and method based on geometrical optical transformation

A technology of geometric optics and geometric transformation, applied in optics, optical components, light guides, etc., can solve problems such as not being able to meet the performance requirements of OAM optical communication systems

Inactive Publication Date: 2019-04-02
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this solution can only realize the extraction or addition of one OAM channel at a time, which is far from meeting the performance requirements of the OAM optical communication system.

Method used

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  • OAM channel extraction and addition system and method based on geometrical optical transformation
  • OAM channel extraction and addition system and method based on geometrical optical transformation
  • OAM channel extraction and addition system and method based on geometrical optical transformation

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specific Embodiment approach 1

[0035] Specific embodiment 1: single extraction of OAM channel: the OAM composite channel of l=3,8 is input in the a port of the first beam splitter, by setting l=3 corresponding area transmission light beam on the programmable spatial light modulator, other The area reflects the beam. A light intensity map with a topological charge of 8 is detected at the b-port of the first beam splitter, and a light intensity map with a topological charge of 1=3 is detected at the d-port of the second beam splitter.

specific Embodiment approach 2

[0036] Specific embodiment 2: a plurality of extraction of OAM channel: the OAM composite channel of input l=10,2,-5 at the a port of the first beam splitter, by setting l=2,- on the programmable spatial light modulator The corresponding area of ​​5 transmits the beam, and the other areas reflect the beam. The light intensity map with topological charge l=2,-5 is detected at the b port of the first beam splitter, and the light intensity map with topological charge l=10 is detected at the d port of the second beam splitter.

specific Embodiment approach 3

[0037] Specific embodiment 3: the single addition of OAM channel: input the OAM composite channel of 1=-4 at the c port of the second beam splitter, input the OAM composite channel of 1=3,8 at the a port of the first beam splitter, By setting l=-4 on the programmable spatial light modulator, the corresponding area transmits light beams, and other areas reflect light beams. Light intensity maps with topological charges l=3, 8, -4 are detected at port b of the first beam splitter.

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Abstract

The invention provides an OAM channel extraction and addition system and method based on geometrical optical transformation. The system simultaneously implements the extraction and addition of multiple OAM beams by combining a mode converter based on linear optical geometrical transformation, a Fourier lens and a programmable spatial light modulator. A symmetrical mode converter is added to the right side of the programmable spatial light modulator, and then the transmission or reflection of each small area of the spatial light modulator is programmed and controlled according to the requirements, so that the extraction and addition of the multi-channel OAM channel can be realized. The OAM light beam mode conversion method combine with the programmable spatial light modulator based on the OAM light beam mode conversion can realize the extraction and addition of the OAM channel.

Description

technical field [0001] The present invention is based on the forward application and reverse application of the geometrical optics transformation combined with the lens focusing method to realize the extraction of part of the OAM channel or the increase of the OAM channel. Background technique [0002] The OAM (orbital angular momentum) beams carrying different topological charges are orthogonal to each other, and theoretically the value of the topological charge can be infinite. After the optical communication application scheme using the OAM beam as the carrier was proposed, the transmission capability of the optical communication system has been greatly improved. However, the operation of the OAM communication system is only a point-to-point application without involving any intermediate network node processing, which greatly limits the scalability of the OAM communication system. [0003] In recent decades, light beams carrying orbital angular momentum (OAM) have been a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/293
CPCG02B6/29383
Inventor 沈飞郭忠义郭凯周红平周清峰冯志康
Owner DONGGUAN UNIV OF TECH
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