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| Hauptverfasser: | , , , , , , |
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| Format: | Preprint |
| Veröffentlicht: |
2026
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| Schlagworte: | |
| Online-Zugang: | https://arxiv.org/abs/2604.10515 |
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| _version_ | 1866908957368385536 |
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| author | He, Yifan Hua, Xuchen Shen, Lei Zhang, Kai Wang, Ping Wan, Chenhao Tang, Ming |
| author_facet | He, Yifan Hua, Xuchen Shen, Lei Zhang, Kai Wang, Ping Wan, Chenhao Tang, Ming |
| contents | The topological confinement is a new mechanism that allows the transmission of cutoff orbital angular momentum (OAM) modes with negligible loss in ring-core fibers (RCFs) and provides a natural immunity against mode coupling. We investigate the influence of fiber design parameters and wavelength on the characteristics of topologically confined modes (TCMs) in step index ring-core fibers (SI-RCFs), and propose a type of graded index ring-core fibers (GI-RCF) with better characteristics. Furthermore, as TCMs occurs in structures with high refractive index difference and are often accompanied by relatively high scattering loss, we fabricate a type of low-loss SI-RCF and observe the stable existence of 24 low-loss TCMs in total. Subsequently, we use an analytical model to estimate the maximum signal-to-noise (SNR) and spectral efficiency (SE) of the fiber, demonstrating its strong capacity advantages. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_10515 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | OAM modes characteristics analysis and low-loss transmission based on topological confinement He, Yifan Hua, Xuchen Shen, Lei Zhang, Kai Wang, Ping Wan, Chenhao Tang, Ming Optics The topological confinement is a new mechanism that allows the transmission of cutoff orbital angular momentum (OAM) modes with negligible loss in ring-core fibers (RCFs) and provides a natural immunity against mode coupling. We investigate the influence of fiber design parameters and wavelength on the characteristics of topologically confined modes (TCMs) in step index ring-core fibers (SI-RCFs), and propose a type of graded index ring-core fibers (GI-RCF) with better characteristics. Furthermore, as TCMs occurs in structures with high refractive index difference and are often accompanied by relatively high scattering loss, we fabricate a type of low-loss SI-RCF and observe the stable existence of 24 low-loss TCMs in total. Subsequently, we use an analytical model to estimate the maximum signal-to-noise (SNR) and spectral efficiency (SE) of the fiber, demonstrating its strong capacity advantages. |
| title | OAM modes characteristics analysis and low-loss transmission based on topological confinement |
| topic | Optics |
| url | https://arxiv.org/abs/2604.10515 |