Abstract

An all-fiber orbital angular momentum (OAM) mode generator enabling simultaneous generation of the second- and the third-order OAM modes with conversion efficiencies larger than 95% has been proposed and experimentally demonstrated, which is realized by using a high-order helical long-period fiber grating (HLPG) written in a thinned four-mode fiber. This is the first time, to the best of our knowledge, that two such OAM modes have been simultaneously obtained at wavelengths ranging from 1450 to 1620 nm by using only one fiber component, i.e., the HLPG. The proposed method provides a new way to simultaneously generate different orders of the OAM modes, which would further expand the OAM’s applications to the fields of the optical tweezers, microscopy, and fiber communication, etc.

© 2021 Optical Society of America

Broadband flat-top second-order OAM mode converter based on a phase-modulated helical long-period fiber grating

Hua Zhao, Zhen Zhang, Miaomiao Zhang, Yuanyuan Hao, Peng Wang, and Hongpu Li
Opt. Express 29(18) 29518-29526 (2021)

Multiple core modes conversion using helical long-period fiber gratings

Chen Jiang, Kaiming Zhou, Bing Sun, Ying Wan, Yuehui Ma, Zhiqiang Wang, Zuxing Zhang, Chengbo Mou, and Yunqi Liu
Opt. Lett. 48(11) 2965-2968 (2023)

High-order OAM mode generation in a helical long-period fiber grating inscribed by an oxyhydrogen-flame

Laipeng Shao, Shen Liu, Min Zhou, Zheng Huang, Weijia Bao, Zhiyong Bai, Zhao Liu, Guoxuan Zhu, Zhongyuan Sun, Junlan Zhong, and Yiping Wang
Opt. Express 29(26) 43371-43378 (2021)

All-fiber second-order orbital angular momentum generator based on a single-helix helical fiber grating

Hua Zhao, Peng Wang, Takuya Yamakawa, and Hongpu Li
Opt. Lett. 44(21) 5370-5373 (2019)

All-fiber third-order orbital angular momentum mode generation employing an asymmetric long-period fiber grating

Xiaodong He, Jiajing Tu, Xiaowen Wu, Shecheng Gao, Lei Shen, Chenglong Hao, Yuanhua Feng, Weiping Liu, and Zhaohui Li
Opt. Lett. 45(13) 3621-3624 (2020)