Abstract

A Reuleaux triangle core fiber (RTF) with triple rotational symmetry is proposed and fabricated. Then the RTF is twisted to form the chiral fiber grating, which converts the core mode into a vortex mode containing 3rd-order orbital angular momentum (OAM). Based on the Fourier expansion of the core boundary, the straight-sided and arc-sided triangular core profiles were analyzed, revealing the mechanism of high-efficiency OAM3 generation. The experimental results show a 3rd-order vortex mode with a high conversion efficiency and purity, and the polarization-independent characteristics endowed by the core shape are also confirmed. The proposed RTF provides a new, to the best of our knowledge, way for higher-order vortex beam generation, which can be used in optical fiber communication systems with OAM multiplexing.

© 2024 Optica Publishing Group

High-order mixed vortex beam generator

Donghui Wang, Chengcheng Feng, Lingzhi Meng, Hongye Wang, and Libo Yuan
Opt. Express 31(25) 42218-42229 (2023)

High-order orbital angular momentum mode conversion based on a chiral long period fiber grating inscribed in a ring core fiber

Zheng Huang, Zhiyong Bai, Rui Liu, Luping Wu, Jianjun Ran, Zikai Chen, Guoxuan Zhu, Shen Liu, Changrui Liao, and Yiping Wang
Opt. Lett. 47(20) 5352-5355 (2022)

Unidirectional coupled chiral fiber grating

Donghui Wang, Chao Ma, Hongye Wang, Chengcheng Feng, Xiaotong Zhang, Houquan Liu, and Libo Yuan
Opt. Lett. 49(4) 985-988 (2024)

OAM mode generation in helically twisted hollow-core antiresonant fiber

Jiajing Tu, Jingbiao Wu, Chuangrong Huang, Jie Zhang, Shecheng Gao, Weiping Liu, and Zhaohui Li
Opt. Lett. 48(7) 1634-1637 (2023)

Low-loss and helical-phase-dependent selective excitation of high-order orbital angular momentum modes in a twisted ring-core fiber

Yan Wu, Jianxiang Wen, Mengdi Zhang, Ying Cao, Wei Chen, Xiaobei Zhang, Taximaiti Yusufu, Fufei Pang, and Tingyun Wang
Opt. Lett. 47(16) 4016-4019 (2022)