Special optical fiber with rotationally symmetric super-gaussian distribution mode field output and preparation method thereof

By designing special optical fibers with rotationally symmetric boundaries and non-monotonic refractive index profiles, the problem of insufficient optical fiber mode field control in existing technologies has been solved, achieving high-quality ultra-Gaussian mode field output and meeting the requirements of high integration and long-term stable operation.

CN122284008APending Publication Date: 2026-06-26SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Filing Date
2026-06-01
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing special optical fibers are difficult to achieve high-quality rotationally symmetric super-Gaussian mode field output, and existing homogenized optical fibers rely on random mode coupling, making it difficult to achieve deterministic control and resulting in poor stability. External optical shaping components are complex to use and cannot meet the requirements of high integration and long-term stable operation.

Method used

A special optical fiber with a core having rotationally symmetric boundaries and a non-monotonic refractive index profile is designed. By inverting the target mode field design and combining it with preform preparation and fiber drawing processes, intrinsic control of the mode field distribution can be achieved, supporting high-order ultra-Gaussian mode field output.

Benefits of technology

It achieves deterministic intrinsic control of fiber mode fields, breaks through the traditional circular symmetry constraint, improves the designability and controllability of mode field spatial distribution, reduces diffraction effects and mode coupling effects, and can achieve stable and efficient super-Gaussian mode field output without external optical shaping elements.

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Abstract

This invention discloses a special optical fiber with rotationally symmetric super-Gaussian mode field output and its fabrication method. The optical fiber comprises a core and a cladding. The core cross-sectional boundary is a finite-weight or continuous rotationally symmetric boundary. The core refractive index distribution is a non-monotonic continuous distribution along the equivalent radial direction, comprising, from the inside out, a central flat region, a refractive index rising region, a refractive index falling region, and a transition region. This non-monotonic continuous distribution is obtained based on the inversion of a preset rotationally symmetric super-Gaussian target mode field, ensuring that the dominant mode supported by the fiber at the operating wavelength exhibits a rotationally symmetric super-Gaussian mode field distribution with a flat central region, rapid edge attenuation, and corresponding to the cross-sectional boundary. The special optical fiber designs its refractive index profile through target mode field inversion and is fabricated using preform preparation and drawing processes. This invention achieves flat-top mode field output without external beam shaping elements, making it suitable for high-power fiber lasers, beam shaping, precision machining, and fiber array splicing applications.
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