Numerical simulation study on refractive index regulation characteristics and coupling transmission of all-solid anti-resonant fiber

Li Pengpeng; She Shengfei; Zhang Yan; Gao Song; Zhao Tong; Peng Han; He Miao; Zhu Zhiyu; Hou Chaoqi; Guo Haitao

doi:10.11884/HPLPB202638.250420

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Article Navigation > High Power Laser and Particle Beams > 2026 > Accepted Manuscript

Li Pengpeng, She Shengfei, Zhang Yan, et al. Numerical simulation study on refractive index regulation characteristics and coupling transmission of all-solid anti-resonant fiber[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250420

Citation:

Li Pengpeng, She Shengfei, Zhang Yan, et al. Numerical simulation study on refractive index regulation characteristics and coupling transmission of all-solid anti-resonant fiber[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250420

Citation:

Li Pengpeng, She Shengfei, Zhang Yan, et al. Numerical simulation study on refractive index regulation characteristics and coupling transmission of all-solid anti-resonant fiber[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250420

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Numerical simulation study on refractive index regulation characteristics and coupling transmission of all-solid anti-resonant fiber

doi: 10.11884/HPLPB202638.250420

Li Pengpeng^{1, 2, 3
,},
She Shengfei^{1, 2, 3},
Zhang Yan^{1, 3},
Gao Song^{1, 3},
Zhao Tong^{1, 2, 3},
Peng Han^{1, 2, 3},
He Miao^{1, 3},
Zhu Zhiyu^{1, 2, 3},
Hou Chaoqi^{1, 2, 3},
Guo Haitao^{1, 2, 3}

1.
State Key Laboratory of Ultrafast Optics Science and Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi’an 710119, China
2.
Centre for Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences (UCAS), Beijing 100049, China
3.
Photonics Functional Materials and Devices Research Laboratory, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi’an 710119, China

Received Date: 2025-11-26
Accepted Date: 2026-01-05
Rev Recd Date: 2026-01-10

Available Online: 2026-02-06

Abstract

Abstract

Background
High-power Yb-doped fiber lasers operating in the 1 μm band have been widely applied in fields such as laser processing, biomedicine, and national defense security. However, with the continuous increase in output power, traditional large-core fibers are susceptible to transverse mode instability (TMI) and stimulated Raman scattering (SRS), among other nonlinear effects. Based on their unique anti-resonant light-guiding mechanism, all-solid anti-resonant silica fibers (AS-ARFs) can realize ultra-large mode area (LMA) propagation while suppressing higher-order modes (HOMs), thus providing an innovative technical approach for balancing high power and high beam quality. Nevertheless, for active Yb-doped AS-ARFs targeting high-power gain applications, the influence mechanism of core refractive index fluctuations on mode characteristics and the fusion-splicing transmission characteristics of “step-index fiber - AS-ARF” structures have not been systematically investigated, which restricts their practical application process.
Purpose
To address the above problems, this study aims to clarify the critical value of refractive index variation for maintaining the original light-guiding mechanism of AS-ARFs, verify their capabilities of low loss, large mode area and beam quality maintenance, explore the fusion-splicing coupling transmission laws between SIFs and AS-ARFs, quantify the core control parameters of active AS-ARFs, and provide theoretical support for their fabrication process optimization and coupling scheme design.
Methods
A six-ring AS-ARF theoretical model was constructed, combined with theoretical derivation and numerical simulation: Comsol Multiphysics was used to analyze the mode characteristics and the influence of refractive index fluctuations, and the Rsoft-BeamPROP module (based on the beam propagation method) was adopted to simulate the light transmission laws in the fusion-splicing coupling scenario.
Results
The critical value of refractive index variation was clarified; the designed AS-ARFs were verified to have the characteristics of low loss, large mode area and excellent beam quality at the target wavelength; the fusion-splicing coupling transmission laws were revealed, and the transmitted energy attenuation was less than 2% when the incident beam diameter matched the core diameter of AS-ARFs.
Conclusions
This study realizes the quantification of core control parameters for active AS-ARFs, laying an important theoretical foundation for the fabrication process optimization of Yb³⁺-doped AS-ARFs (with a focus on refractive index uniformity control) and the design of practical coupling schemes.
- all-solid anti-resonant fiber (AS-ARF),
- refractive index regulation,
- mode characteristics,
- fusion splicing transmission,
- mode field matching

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References(19)

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