scholarly journals An Evaluation of Orbital Angular Momentum Multiplexing Technology

2019 ◽  
Vol 9 (9) ◽  
pp. 1729 ◽  
Author(s):  
Doohwan Lee ◽  
Hirofumi Sasaki ◽  
Hiroyuki Fukumoto ◽  
Yasunori Yagi ◽  
Takashi Shimizu
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Theoretical Study ◽  
Wireless Transmission ◽  
Theoretical Evaluation ◽  
Communication Performance ◽  
Transmission Distance ◽  
Dielectric Lens ◽  
Point To Point ◽  
Insight Into

This paper reports our investigation of wireless communication performance obtained using orbital angular momentum (OAM) multiplexing, from theoretical evaluation to experimental study. First, we show how we performed a basic theoretical study on wireless OAM multiplexing performance regarding modulation, demodulation, multiplexing, and demultiplexing. This provided a clear picture of the effects of mode attenuation and gave us insight into the potential and limitations of OAM wireless communications. Then, we expanded our study to experimental evaluation of a dielectric lens and end-to-end wireless transmission on 28 gigahertz frequency bands. To overcome the beam divergence of OAM multiplexing, we propose a combination of multi-input multi-output (MIMO) and OAM technology, named OAM-MIMO multiplexing. We achieved 45 Gbps (gigabits per second) throughput using OAM multiplexing with five OAM modes. We also experimentally demonstrated the effectiveness of the proposed OAM-MIMO multiplexing using a total of 11 OAM modes. Experimental OAM-MIMO multiplexing results reached a new milestone for point-to-point transmission rates when 100 Gbps was achieved at a 10-m transmission distance.

scholarly journals High-Rate Continuous-Variable Quantum Key Distribution with Orbital Angular Momentum Multiplexing

Entropy ◽  
2021 ◽  
Vol 23 (9) ◽  
pp. 1187
Author(s):  
Xinchao Ruan ◽  
Wenhao Shi ◽  
Guojun Chen ◽  
Wei Zhao ◽  
Hang Zhang ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Continuous Variable ◽  
High Rate ◽  
Secret Key ◽  
Quantum Communications ◽  
Transmission Distance ◽  
Atmospheric Channel

The secret key rate is one of the main obstacles to the practical application of continuous-variable quantum key distribution (CVQKD). In this paper, we propose a multiplexing scheme to increase the secret key rate of the CVQKD system with orbital angular momentum (OAM). The propagation characteristics of a typical vortex beam, involving the Laguerre–Gaussian (LG) beam, are analyzed in an atmospheric channel for the Kolmogorov turbulence model. Discrete modulation is utilized to extend the maximal transmission distance. We show the effect of the transmittance of the beam over the turbulent channel on the secret key rate and the transmission distance. Numerical simulations indicate that the OAM multiplexing scheme can improve the performance of the CVQKD system and hence has potential use for practical high-rate quantum communications.

scholarly journals Experimental evaluation of 3D printed spiral phase plates for enabling an orbital angular momentum multiplexed radio system

2019 ◽  
Vol 6 (12) ◽  
pp. 191419 ◽  
Author(s):  
B. Allen ◽  
T. Pelham ◽  
Y. Wu ◽  
T. Drysdale ◽  
D. Isakov ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Communication Link ◽  
Material Interface ◽  
Radio System ◽  
Dielectric Lens ◽  
3D Printed ◽  
Phase Plates ◽  
Spiral Phase ◽  
Additional Loss

This paper evaluates the performance of three-dimensionally (3D) printed spiral phase plates (SPPs) for enabling an orbital angular momentum (OAM) multiplexed radio system. The design and realization of the SPPs by means of additive manufacturing exploiting a high-permittivity material is described. Modes 1 and 2 SPPs are then evaluated at 15 GHz in terms of 3D complex radiation pattern, mode purity and beam collimation by means of a 3D printed dielectric lens. The results with the lens yield a crosstalk of −8 dB for between modes 1 and −1, and −11.4 dB for between modes 2 and −2. We suggest a mode multiplexer architecture that is expected to further reduce the crosstalk for each mode. An additional loss of 4.2 dB is incurred with the SPPs inserted into the communication link, which is undesirable for obtaining reliable LTE-based communications. Thus, we suggest: using lower loss materials, seeking ways to reduce material interface reflections or alternative ways of OAM multiplexing to realize a viable OAM multiplexed radio system.

scholarly journals Orbital Angular Momentum (OAM) Mode-Reconfigurable Discrete Dielectric Lens Operating at 300 GHz

2020 ◽  
Vol 10 (5) ◽  
pp. 480-489
Author(s):  
Geng-Bo Wu ◽  
Ka Fai Chan ◽  
Shi-Wei Qu ◽  
Kin Fai Tong ◽  
Chi Hou Chan
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Dielectric Lens

Advanced Mode Unity Using Loop Antennas Proximate to Reflector for Orbital Angular Momentum Communication

2018 ◽  
Author(s):  
Ryohei Yamagishi ◽  
Hiroto Otsuka ◽  
Ryo Ishikawa ◽  
Akira Saitou ◽  
Hiroshi Suzuki ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Loop Antennas
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