All-fiber second-order orbital angular momentum generator based on a single-helix helical fiber grating

2019 ◽  
Vol 44 (21) ◽  
pp. 5370 ◽  
Author(s):  
Hua Zhao ◽  
Peng Wang ◽  
Takuya Yamakawa ◽  
Hongpu Li
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Second Order ◽  
Fiber Grating ◽  
Single Helix

CALCULATION OF EPR PARAMETERSgFACTORS FORCe3+ION INYBa2Cu3O6+xSUPERCONDUCTOR

2005 ◽  
Vol 19 (01n03) ◽  
pp. 143-146 ◽  
Author(s):  
HUI-NING DONG ◽  
HUI-PING DU ◽  
CHANG-KUI DUAN ◽  
XIAO-BING LUO
Keyword(s):  
Angular Momentum ◽  
Crystal Field ◽  
Orbital Angular Momentum ◽  
Second Order ◽  
Order Perturbation ◽  
Orthorhombic Symmetry ◽  
Superposition Model ◽  
Epr Parameters ◽  
Kramers Doublet ◽  
G Factors

The perturbation formulae of EPR parameters g factors gx, gyand gzfor the lowest Kramers doublet of 4f1ion in orthorhombic symmetry are established. In these formulae, the contributions of the covalency effects, the admixture between J=7/2 and J=5/2 states as well as the second-order perturbation (which is not considered in the previous works) via crystal-field and orbital angular momentum interactions are all included. According to these formulae, and by using the superposition model, the g-factors gx, gyand gzfor Ce3+center in YBa2Cu3O6+ xsuperconductor are calculated. The results are discussed.

All-fiber third-order orbital angular momentum mode generation employing an asymmetric long-period fiber grating

2020 ◽  
Vol 45 (13) ◽  
pp. 3621 ◽  
Author(s):  
Xiaodong He ◽  
Jiajing Tu ◽  
Xiaowen Wu ◽  
Shecheng Gao ◽  
Lei Shen ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Fiber Grating ◽  
Third Order ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Momentum Mode ◽  
Period Fiber Grating ◽  
Mode Generation

scholarly journals Generation of Orbital Angular Momentum Modes Using Fiber Systems

2019 ◽  
Vol 9 (5) ◽  
pp. 1033 ◽  
Author(s):  
Hongwei Zhang ◽  
Baiwei Mao ◽  
Ya Han ◽  
Zhi Wang ◽  
Yang Yue ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Fiber Grating ◽  
Spatial Methods ◽  
Long Period ◽  
Significant Interest ◽  
Low Insertion Loss ◽  
Period Fiber Grating ◽  
Fiber Modes ◽  
Mode Generation

Orbital angular momentum (OAM) beams, characterized by the helical phase wavefront, have received significant interest in various areas of study. There are many methods to generate OAM beams, which can be roughly divided into two types: spatial methods and fiber methods. As a natural shaper of OAM beams, the fibers exhibit unique merits, namely, miniaturization and a low insertion loss. In this paper, we review the recent advances in fiber OAM mode generation systems, in both the interior and exterior of the beams. We introduce the basic concepts of fiber modes and the generation and detection theories of OAM modes. In addition, fiber systems based on different nuclear devices are introduced, including the long-period fiber grating, the mode-selective coupler, microstructural optical fiber, and the photonic lantern. Finally, the key challenges and prospects for fiber OAM mode systems are discussed.

scholarly journals Controllable all-fiber generation/conversion of circularly polarized orbital angular momentum beams using long period fiber gratings

Nanophotonics ◽  
2018 ◽  
Vol 7 (1) ◽  
pp. 287-293 ◽  
Author(s):  
Ya Han ◽  
Yan-Ge Liu ◽  
Zhi Wang ◽  
Wei Huang ◽  
Lei Chen ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Higher Order ◽  
Fiber Grating ◽  
Telecommunication System ◽  
Circularly Polarized ◽  
Long Period ◽  
Flexible Mode ◽  
Long Period Fiber Gratings ◽  
Core Modes

AbstractMode-division multiplexing (MDM) is a promising technology for increasing the data-carrying capacity of a single few-mode optical fiber. The flexible mode manipulation would be highly desired in a robust MDM network. Recently, orbital angular momentum (OAM) modes have received wide attention as a new spatial mode basis. In this paper, we firstly proposed a long period fiber grating (LPFG) system to realize mode conversions between the higher order LP core modes in four-mode fiber. Based on the proposed system, we, for the first time, demonstrate the controllable all-fiber generation and conversion of the higher order LP core modes to the first and second order circularly polarized OAM beams with all the combinations of spin and OAM. Therefore, the proposed LPFG system can be potentially used as a controllable higher order OAM beam switch and a physical layer of the translating protocol from the conventional LP modes communication to the OAM modes communication in the future mode carrier telecommunication system and light calculation protocols.

All-fiber linear polarization and orbital angular momentum modes amplifier based on few-mode erbium-doped fiber and long period fiber grating

2018 ◽  
Vol 16 (10) ◽  
pp. 100604 ◽  
Author(s):  
Jianfei Xing Jianfei Xing ◽  
Jianxiang Wen Jianxiang Wen ◽  
Jie Wang Jie Wang ◽  
Fufei Pang Fufei Pang ◽  
Zhenyi Chen Zhenyi Chen ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Linear Polarization ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Erbium Doped ◽  
Period Fiber Grating

Polarization-independent orbital angular momentum generator based on a chiral fiber grating

2018 ◽  
Vol 44 (1) ◽  
pp. 61 ◽  
Author(s):  
Yan Zhang ◽  
Zhiyong Bai ◽  
Cailing Fu ◽  
Shen Liu ◽  
Jian Tang ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Fiber Grating ◽  
Polarization Independent

Orbital angular momentum generator based on hollow-core photonic bandgap fiber grating

2019 ◽  
Vol 12 (7) ◽  
pp. 072004 ◽  
Author(s):  
Zhiyong Bai ◽  
Mingquan Li ◽  
Yiping Wang ◽  
Jian Tang ◽  
Zhe Zhang ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Photonic Bandgap ◽  
Fiber Grating ◽  
Hollow Core ◽  
Photonic Bandgap Fiber

scholarly journals Generation, Transmission and Application of Orbital Angular Momentum in Optical Fiber: A Review

2021 ◽  
Vol 9 ◽  
Author(s):  
Minghao Ma ◽  
Yudong Lian ◽  
Yulei Wang ◽  
Zhiwei Lu
Keyword(s):  
Angular Momentum ◽  
Optical Fibers ◽  
Orbital Angular Momentum ◽  
Optical Systems ◽  
Necessary Condition ◽  
Fiber Grating ◽  
Crystal Fiber ◽  
Effective Use ◽  
Propagation Properties ◽  
Ring Core

Optical orbital angular momentum (OAM) has become a hot research topic because of its unique properties due to its spiral distribution of phases. The production and transmission of OAM has also become a necessary condition for effective use of OAM. As an optical waveguide with good propagation properties, optical fibers are used in optical systems supporting OAM. This paper introduces the OAM generation and transmission system based on fiber, summarizes the current photonic crystal fiber, ring core fiber, fiber grating and other all-fiber systems that can support OAM modes, and explains some experimental principles. Finally, an outlook on OAM generation or transmission devices for all-fiber systems is presented, providing a useful reference for future related research.

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