Abstract

A wave-band-tunable optical fiber broadband orbital angular momentum (OAM) mode converter based on a helical long-period fiber grating (HLPFG) and dispersion turning point (DTP) tuning technique is demonstrated both theoretically and experimentally. The DTP tuning is achieved by thinning the optical fiber during the HLPFG inscription. As a proof of concept, the DTP wavelength of the LP_1,5 mode is successfully tuned from the original ∼2.4 µm to ∼2.0 µm and ∼1.7 µm. With the help of the HLPFG, broadband OAM mode conversion (LP_0,1→LP_1,5) is demonstrated near the 2.0 µm and 1.7 µm wave bands. This work addresses a longstanding problem that the broadband mode conversion is limited by the intrinsic DTP wavelength of the modes and provides a new, to the best of our knowledge, alternative for broadband OAM mode conversion at the desired wave bands.

© 2022 Optica Publishing Group

Broadband tunable orbital angular momentum mode converter based on a conventional single-mode all-fiber configuration

Min Zhou, Zhe Zhang, Laipeng Shao, Shen Liu, Yu Liu, Yu Pang, Zhiyong Bai, Cailing Fu, Wei Cui, Lin Qi, and Yiping Wang
Opt. Express 29(10) 15595-15603 (2021)

Multichannel ±2 order orbital angular momentum mode converter based on an elliptical-core helical intermediate-period fiber grating

Min Zhou, Zhe Zhang, Tao Zou, Laipeng Shao, Shen Liu, Zhiyong Bai, Yu Pang, Yu Liu, and Yiping Wang
Opt. Lett. 47(15) 3896-3899 (2022)

Ultrasensitive refractometer based on helical long-period fiber grating near the dispersion turning point

Shen Liu, Min Zhou, Zhe Zhang, Zhongyuan Sun, Zhiyong Bai, and Yiping Wang
Opt. Lett. 47(10) 2602-2605 (2022)

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)

Controllable all-fiber orbital angular momentum mode converter

Shuhui Li, Qi Mo, Xiao Hu, Cheng Du, and Jian Wang
Opt. Lett. 40(18) 4376-4379 (2015)