A mixed-order or fractional-order vortex beam mode recognition device and method

Abstract

The invention discloses a mixed-order or fractional-order vortex beam mode identification device and method, the device includes: a beam generating device, which is used to process the heteropolar fundamental mode Gaussian light to generate Gaussian light in the horizontal polarization direction and then transform it It is a horizontally polarized mixed-order or fractional-order vortex beam; a characteristic sample preparation device is used to perform turbulent phase and two-dimensional fork-shaped vortex grating phase loading on the mixed-order or fractional-order vortex beam. After far-field diffraction, the far-field field diffraction array, and use the characteristic parameter extraction device to extract the characteristic samples to obtain the distortion characteristic samples required for the training and testing of the fully connected neural network; the network training and identification device is used to iteratively train the fully connected neural network through the distortion characteristic samples to obtain After optimizing the model, the mixed-order or fractional-order vortex optical modes in the test set are detected by the optimal model. The invention aims to realize high-speed, high-precision and wide-range vortex optical mode detection, thereby improving the performance of OAM communication.

Description

technical field [0001] The invention relates to the fields of artificial intelligence and optical technology, in particular to a mixed-order or fractional-order vortex beam mode recognition device and method. Background technique [0002] Vortex light is a light beam carrying orbital angular momentum OAM (Orbital Angular Momentum, OAM, the angular momentum of moving in space). There is a phase singularity in the center of the beam, and it has a "doughnut" structure in the spatial distribution. These properties make vortex light widely used in optical manipulation, quantum information processing, photonic computer, and free-light space communication. In the field of communication, since different OAM beams are orthogonal to each other, a new physical dimension is provided, which can be combined with traditional multiplexing technology as a carrier for multiplexing, which greatly improves the communication capacity and spectrum efficiency of the system. At present, a lot of r...

AI Technical Summary

Problems solved by technology

However, shift keying and multiplexing communication, which manifest as fast switching of OAM modes, encounter great obstacles due to the lack of efficient and accurate identification of mixed-order or fractional-order vortex light.

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