Using Mechanically-Induced Long-Period Fiber Gratings for OAM Modes Generation Based on Anti-Resonant Mechanisms in Ring-Core Fibers

被引：1
|
作者：
Qiu, Jianheng [1 ]
Pang, Fufei [1 ]
Zhang, Liang [1 ]
Wei, Heming [1 ]
Shang, Yana [1 ]
Chen, Wei [1 ]
Huang, Sujuan [1 ]
Wang, Tingyun [1 ]
机构：
[1] Shanghai Univ, Key Lab Specialty Fiber Opt & Opt Access Networks, Joint Int Res Lab Specialty Fiber Opt & Adv Comm, Shanghai Inst Adv Commun & Data Sci, Shanghai 200444, Peoples R China
来源：
IEEE PHOTONICS JOURNAL | 2022年 / 14卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Optical fiber polarization; Refractive index; Optical fiber sensors; Optical fiber theory; Fiber gratings; Optical variables control; Optical refraction; Anti-resonant reflection guidance; long-period fiber gratings; orbital angular momentum; ring-core fiber; ORBITAL ANGULAR-MOMENTUM;
D O I：
10.1109/JPHOT.2022.3159112
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A flexible first-order OAM modes generation in ring-core fibers (RCFs) based on a mechanically-induced long-period fiber grating (MLPFG) is proposed. By directly fusion splicing a standard single-mode fiber (SMF) and RCFs, the anti-resonant reflection guidance mechanism (ARRGM) is introduced in the RCF, leading to the guided-core modes, so-called anti-resonant modes (AR modes), which have a Gaussian field distribution and are confined in low-refractive index central core of RCFs. A mechanical long-period fiber grating is used to couple the AR modes into the OAM modes propagated in the high-index ring core of the RCF. Results show that the generated OAM modes are the combination of two orthogonal linearly polarized (LP) modes with +/-pi/2 phase shift in the ring core. The mode conversion efficiency of OAM(+1) and OAM(-1) can reach 95% and 94%, respectively, indicating promising applications in sensing and communication of the RCFs.
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页数：6
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