Open AccessExcitation of high order orbital angular momentum modes in ultra-short chiral long period fiber gratings
Author(s) -
Zheng Huang,
Zhiyong Bai,
Guoxuan Zhu,
Churou Huang,
Jiayan Chen,
Shen Liu,
Cailing Fu,
Jun He,
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.442760
Subject(s) - optics , angular momentum , polarization (electrochemistry) , physics , excitation , excited state , mode volume , long period fiber grating , optical fiber , polarization maintaining optical fiber , materials science , atomic physics , fiber optic sensor , classical mechanics , quantum mechanics , chemistry
A class of ultra-short chiral long period fiber gratings (CLPFGs) are prepared by writing a spiral curve on the surface of a six-mode fiber. The CLPFGs are applied to excite ±2 nd - and ±3 rd -order orbital angular momentum (OAM) modes. The coupling efficiency of the CLPFG in these modes can be as high as 99%, when the length is only 0.5cm. The polarization characteristic of the excited higher-order OAM modes in CLPFGs was theoretically analyzed and experimentally investigated. Results show that the obtained ±2 nd - and ±3 rd -order OAM modes are polarization independent, as expected.