Open AccessBroadband tunable orbital angular momentum mode converter based on a conventional single-mode all-fiber configuration
Author(s) -
Min Zhou,
Zhe Zhang,
Laipeng Shao,
Shen Liu,
Yu Liu,
Yu Pang,
Zhiyong Bai,
Cailing Fu,
Wei Cui,
Lin Qi,
Yiping Wang
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.421967
Subject(s) - optics , broadband , bandwidth (computing) , single mode optical fiber , fiber bragg grating , angular momentum , physics , long period fiber grating , dispersion shifted fiber , materials science , optical fiber , fiber optic sensor , telecommunications , computer science , quantum mechanics
A broadband tunable orbital angular momentum (OAM) mode converter based on a helical long-period fiber grating (HLPFG) inscribed in a conventional single-mode fiber (SMF) is experimentally demonstrated. The proposed all-fiber OAM mode converter is based on the core-cladding mode dual resonance near the dispersion turning point (DTP). The converter can operate with a bandwidth of 303.9 nm @ -3 dB and 182.2 nm @ -10 dB, which is, as far as we know, the widest bandwidth for a conventional SMF. Furthermore, the bandwidth of the OAM mode can be dynamically tuned within a large dynamic range (>80 nm) by simply twisting the fiber clockwise (CW) or counterclockwise (CCW). The dynamic tunability of the bandwidth of the proposed OAM mode generator may find vital applications in large-capacity optical fiber communication systems.