Hybrid OAM Multiplexing using Butler Matrices toward over 100 Gbit/s Wireless Transmission

Sasaki, Hirofumi; Yagi, Yasunori; Yamada, Takayuki; Semoto, Tomoki; Lee, Doohwan

doi:10.1109/gcwkshps50303.2020.9367490

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…Wavefront structuring of the transmitted beam might mitigate the limited-size receiver aperture effect [91,92]. To save size and weight for larger apertures, alternatives to SPPs for THz OAM generation/detection can be considered, such as using antenna-array structures with multiple smaller antenna elements and thinner metasurface structures [12].…”

Section: Summary and Discussionmentioning

confidence: 99%

“…To potentially increase the number of multiplexed OAM beams in the THz MDM systems, designing and utilizing a single compact device that can generate/detect and (de)multiplex multiple data-carrying OAM beams can be considered. Various structures and devices have been demonstrated in optical and mm-wave regimes for multiple OAM channels generation and multiplexing [12,89,93,94], which might potentially inspire the designs for the THz region.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…Such OAM-based MDM communications have been investigated and demonstrated for both free-space and fiber systems in the optical domain [6][7][8]. Although much work has focused on optical OAM beams, it has been shown that other EM and mechanical waves across different frequency regimes, including microwaves, millimeter waves, and acoustic waves, can be structured to carry OAM for OAM-based communications [9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High capacity terahertz communication systems based on multiple orbital-angular-momentum beams

Willner

Su²,

Zhou³

et al. 2022

J. Opt.

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Structured electromagnetic (EM) waves carrying orbital angular momentum (OAM) have been explored in various frequency regimes to enhance the data capacity of communication systems by multiplexing multiple co-propagating orthogonal OAM beams (i.e., mode-division multiplexing (MDM)). Terahertz (THz) communications in free space have gained interest as THz waves tend to have: (a) larger bandwidth and lower beam divergence than millimeter-waves, and (b) lower interaction with matter conditions than optical waves. In this paper, we review recent experimental demonstrations of OAM-based THz MDM communication systems, including (i) THz MDM system with two multiplexed OAM beams; (ii) THz OAM multiplexing together with frequency-division-multiplexing (FDM) and polarization-division-multiplexing (PDM); (iii) multiplexing a full set of two-dimensional Laguerre-Gaussian (LG_(l,p)) beams; and (iv) THz integrated OAM emitter for OAM mode generation and multiplexing. System performance of THz OAM links with the effect of turbulence, divergence, and multipath is also simulated and analyzed.

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Section: Summary and Discussionmentioning

confidence: 99%

Section: Summary and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High capacity terahertz communication systems based on multiple orbital-angular-momentum beams

Willner

Su²,

Zhou³

et al. 2022

J. Opt.

Self Cite

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show abstract

Vortex-Beam Information Exchange

2023

Optical Wireless Communication Theory and Technology

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Design and realization of a compact substrate integrated coaxial line butler matrix for beamforming applications

Idury,

Delmonte,

Silvestri

et al. 2024

Int. J. Microw. Wireless Technol.

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This article presents the modeling and realization of a compact substrate integrated coaxial line (SICL) based butler matrix operating at 5 GHz for beam-forming applications. The proposed 4 × 4 butler matrix is developed using SICL-based hybrid coupler, crossover, and phase shifter. A compact 90∘ coupler comprising of center tapped unequal stubs is designed to enhance the size reduction as well as to extend the out of band rejection. Wideband SICL-based crossover operating from DC to 10 GHz is conceived for the proposed butler matrix using a plated through hole as transition. The SICL crossover features very high measured isolation of 65 dB owing to the reduction in coupling between the two signal paths within a lateral footprint of only 0.034 $\lambda_g^2$ . A meandered SICL-based line is used in order to provide the necessary 45∘ and 0∘ phase shift to realize the butler matrix. The fully shielded and self-packaged compact 4 × 4 SICL-based butler matrix is fabricated and experimentally validated to operate at 5 GHz.

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Hybrid OAM Multiplexing using Butler Matrices toward over 100 Gbit/s Wireless Transmission

Cited by 5 publications

References 21 publications

High capacity terahertz communication systems based on multiple orbital-angular-momentum beams

High capacity terahertz communication systems based on multiple orbital-angular-momentum beams

Vortex-Beam Information Exchange

Design and realization of a compact substrate integrated coaxial line butler matrix for beamforming applications

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