Detection system for identifying OAM beam topological charge based on signal crosstalk distribution characteristics

Abstract

The invention provides a detection system for identifying OAM beam topological charge based on signal crosstalk distribution characteristics. The system comprises an OAM multiplexing module, first andsecond optical antenna modules, an OAM demultiplexing module and an OAM beam topology charge detection module. The OAM multiplexing module carries out orbital angular momentum multiplexing on a vortex beam. The first optical antenna module transmits a vortex beam signal which passes through the OAM multiplexing module into an optical communication channel. The second optical antenna module receives a beam which passes through the optical communication channel and transmits the beam to the OAM demultiplexing module. The OAM demultiplexing module decomposes a received light signal into a set ofOAM modes, converts the signal into a crosstalk distributed electrical signal and then inputs the crosstalk distributed electrical signal into the OAM beam topology charge detection module. The OAM beam topology charge detection module analyzes the inputted data to obtain the topology charge of the vortex beam. According to the detection system, the characteristics of the crosstalk distribution is used, the topological charge information contained in the crosstalk distribution is fully utilized, thus the vortex beam topology charge detection has high accuracy and a fast rate, and the high-rate information transmission is realized.

Description

technical field [0001] The invention belongs to the technical field of laser communication, and in particular relates to a detection system for identifying the topological charge of an orbital angular momentum (OAM) light beam based on signal crosstalk distribution characteristics. Background technique [0002] Since the 1990s, scholars at home and abroad have carried out a lot of research work on vortex beams, including the detection of topological charges of vortex beams. From the beginning, the topological charge detection of vortex beam mainly includes two methods, one is based on the interference and diffraction effect to use optical methods on the spot at the receiving end to make the numerical characteristics of the topological charge appear in the spot image after interference or diffraction middle. This method takes advantage of the macroscopic characteristics of the phase distribution of vortex beams. When coherent vortex beams have different topological charges, ...

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Problems solved by technology

[0004] In order to solve the technical problems of complex structure, low accuracy, low speed, and inconvenient use in the prior art, the present invention provides a vortex beam topological charge detection system with simple structure, high accuracy, high speed, and easy use

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