Supercontinuum generation with extended bandwidth and improved purity in graded-index ring-core fiber
In this paper, we numerically investigate the impact of shape factor (k) on the mode properties of graded-index ring-core fiber (GIRCF). A 50 mol% Ge-doped GIRCF with shape factor of 2 is devised to generate supercontinuum (SC) carrying orbital angular momentum (OAM) modes, which possesses flat dispersion with a minor variation of < ± 30 ps/nm/km from 1090 to 2590 nm. The generated supercontinuum (SC) in the designed GIRCF carrying OAM<sub>1,1</sub> mode covers 2305-nm wavelength range from 750 to 3055 nm at - 40 dB level. The graded refractive index profile (RIP), introduced as a new parameter, offers an additional dimension for the design of ring-core fiber (RCF) supporting OAM modes. The graded RIP contributes to the creation of flat and near-zero dispersion in the RCF structures and reduces the spin-orbit coupling (SOC) effect at the material boundary, leading to broader spectral coverage and higher mode purity in the output spectra.
Authors
- Yuxi Fang (ORCID: https://orcid.org/0000-0003-1736-484X)
- Wenpu Geng (ORCID: https://orcid.org/0000-0002-0989-5918)
- Jian Yang (ORCID: https://orcid.org/0000-0002-4028-2298)
- Fei Yang (ORCID: https://orcid.org/0000-0002-0032-0114)
- Zhongqi Pan (ORCID: https://orcid.org/0000-0003-2325-2254)
- Yuanpeng Liu (ORCID: https://orcid.org/0000-0001-9144-4157)
- Qinru Peng (ORCID: https://orcid.org/0009-0006-6764-2720)
- Yiwen Zhang (ORCID: https://orcid.org/0000-0002-7304-9820)
- Yang Yue (ORCID: https://orcid.org/0000-0002-8945-330X)
Institutions
- China Academy of Space Technology (CN)
- Nankai University (CN)
- University of Louisiana at Lafayette (US)
- Xi'an Jiaotong University (CN)
Publication Details
- Journal
- Scientific Reports
- Published
- 2024-12-04
- DOI
- https://doi.org/10.1038/s41598-024-80241-4
- Primary Topic
- Orbital Angular Momentum in Optics
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Natural Science Foundation of Shaanxi Province