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Photon orbital angular momentum mode measurement method and system based on helical transformation

A technology of orbital angular momentum and measurement method, which is applied in the field of photon orbital angular momentum mode measurement, can solve problems such as mode crosstalk, and achieve the effects of improving isolation, great practical potential, and great flexibility

Active Publication Date: 2018-11-30
SUN YAT SEN UNIV
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Problems solved by technology

However, since this transformation scheme expands the light field along a closed circular path, which breaks the characteristic of infinite circularity in the angular direction, the demodulated OAM mode will be widened spatially, resulting in the demodulation spot of the adjacent mode have significant overlap between them, causing crosstalk between modes

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  • Photon orbital angular momentum mode measurement method and system based on helical transformation
  • Photon orbital angular momentum mode measurement method and system based on helical transformation
  • Photon orbital angular momentum mode measurement method and system based on helical transformation

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[0044] The accompanying drawings are for illustrative purposes only and cannot be construed as limiting the patent;

[0045] In order to better illustrate this embodiment, some parts in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0046] For those skilled in the art, it is understandable that some well-known structures and descriptions thereof may be omitted in the drawings.

[0047] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0048] A photon orbital angular momentum mode measurement system based on helical transformation, which is composed of an optical coordinate transformation module, a Fourier transformation module and a light intensity detection module, such as figure 2 shown. The core optical coordinate transformation module is composed of two phase plates with light field phase modulation function (namely p...

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Abstract

The invention discloses a photon orbital angular momentum mode measurement method and system based on helical transformation. The method comprises the following steps: a phase plate at an input planemaps an incident light field to a straight line of an output plane along a helical path on the input plane, and the phase plate at the output plane compensates the phase accumulated by propagating thelight field to the output plane from the input plane in the above transformation process, thereby a the to-be-tested photo orbital angular momentum mode at the input plane into a plane wave mode withthe specific tilt wave-front at the output plane; and then a convex lens focus the plane wave modes with different tilt wave-fronts on different locations of the focal plane, thereby realizing one-to-one corresponding and detection of the to-be-tested photo orbital angular momentum mode and the space location. The adjacent model crosstalking problem caused by demodulation facula widening is effectively overcome, and the high-resolution photon orbital angular momentum mode measurement is further realized when the high demodulation efficiency is maintained.

Description

technical field [0001] The invention relates to the field of spatial mode multiplexing / demultiplexing for optical communication applications, and more specifically, to a method and system for measuring photon orbital angular momentum mode based on spiral transformation. Background technique [0002] With the development of a complete set of information technologies centered on the Internet, including mobile Internet, Internet of Things, cloud computing, and big data, the rapid expansion of information has placed a huge demand on the information transmission capacity of optical communication systems. In view of the current traditional channel multiplexing technology including wavelength division multiplexing, time division multiplexing and polarization multiplexing, etc., the improvement of communication capacity is close to the limit. It has become one of the important research directions in the current communication field. Mode-division multiplexing in the space domain uti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/04G01J1/42
CPCG01J1/4257H04J14/04
Inventor 陈钰杰闻远辉扬尼斯·克里姆斯余思远
Owner SUN YAT SEN UNIV
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