Affiliation:
1. Sun Yat-sen University
2. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)
Abstract
We investigate the orbital angular momentum (OAM) mode-generating process of a long-period onefold chiral fiber grating (L-1-CFG) based on a helically twisted hollow-core antiresonant fiber (HC-ARF). Taking the right-handed L-1-CFG for an example, we theoretically and experimentally prove that the first-order OAM+1 mode can be generated by only inputting a Gaussian beam. We fabricated three right-handed L-1-CFG samples based on the helically twisted HC-ARF with twist rates (α) of −0.42, −0.50, and −0.60 rad/mm, where the twisted HC-ARF with α of −0.42 rad/mm can achieve high OAM+1 mode purity of 94%. Subsequently, we present simulated and experimental transmission spectra at the C-band, and sufficient modulation depths were obtained at wavelengths of 1550 nm and 1561.5 nm in the experiment.
Funder
Key Technologies Research and Development Program
National Natural Science Foundation of China
Guangzhou Basic and Applied Basic Research Foundation
Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory
Subject
Atomic and Molecular Physics, and Optics
Cited by
2 articles.
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