Optical fiber transmission image restoration method and device based on complex amplitude regulation metasurface diffraction device

By deploying complex amplitude-controlled metasurface diffraction devices at the far end of multimode fibers and designing metasurface arrays using diffraction neural network or analytical method, the mode dispersion and crosstalk problems in the multimode fiber transmission process are solved, miniaturization and efficient image recovery of multimode fiber imaging systems are achieved, and are suitable for scenarios such as high-speed communication and endopedia.

CN120447131AActive Publication Date: 2025-08-08ZHEJIANG UNIV
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Patent Information

Application Number
CN202510355091.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-25
Publication Date
2025-08-08
Estimated Expiration
2045-03-25

AI Technical Summary

Technical Problem

Multimode optical fibers have mode dispersion and crosstalk problems during transmission, resulting in reduced image clarity and accuracy, and large system size, which is not suitable for applications in chip-level mode multiplexing and on-chip quantum optics.

Method used

The optical fiber transmission image recovery method based on complex amplitude regulation metasurface diffraction devices is adopted, and a single-layer metasurface diffraction device is designed using diffraction neural network training or analytical method to design a single-layer metasurface diffraction device, and complex amplitude modulation of the emitted circularly polarized light to achieve high-resolution or low-resolution image recovery.

Benefits of technology

The multi-mode fiber imaging system is miniaturized, and the quality and stability of image recovery are improved. It is suitable for high-speed communication and endoptic scenarios, improving the accuracy of image recovery and system flexibility.

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Abstract

The invention discloses an optical fiber transmission image recovery method and device based on a complex amplitude regulation metasurface diffraction device, and the method comprises the steps: obtaining the complex amplitude distribution of each diffraction layer through the training of a diffraction neural network, designing a corresponding metasurface array, and preparing a cascaded metasurface diffraction device with a complex amplitude regulation function, deploying a cascade metasurface diffraction device to the far end of the multimode optical fiber and performing complex amplitude modulation on emergent circularly polarized light to realize high-resolution or high-sampling-rate image recovery; or an optical fiber transmission inverse matrix is solved by using an analytical method, and a corresponding metasurface array is designed, so that the single-layer metasurface diffraction device with a complex amplitude regulation and control function is prepared; and deploying the single-layer metasurface diffraction device to the far end of the few-mode optical fiber and carrying out complex amplitude modulation on emergent circularly polarized light to realize low-resolution or low-sampling-rate image recovery. Miniaturization of a multimode optical fiber imaging system can be realized, and the image recovery quality is effectively improved based on complex amplitude modulation of the metasurface diffraction device.
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