Modal coupling and crosstalk due to turbulence and divergence on free space THz links using multiple orbital angular momentum beams

Abstract Orbital-angular-momentum (OAM) multiplexing has been utilized to increase the channel capacity in both millimeter-wave and optical domains. Terahertz (THz) wireless communication is attracting increasing attention due to its broadband spectral resources. Thus, it might be valuable to explor...

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Autores principales:	Zhe Zhao, Runzhou Zhang, Hao Song, Kai Pang, Ahmed Almaiman, Huibin Zhou, Haoqian Song, Cong Liu, Nanzhe Hu, Xinzhou Su, Amir Minoofar, Hirofumi Sasaki, Doohwan Lee, Moshe Tur, Andreas F. Molisch, Alan E. Willner
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/172382cfc3754222b822b7df2041d5fc
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spelling	oai:doaj.org-article:172382cfc3754222b822b7df2041d5fc2021-12-02T13:57:13ZModal coupling and crosstalk due to turbulence and divergence on free space THz links using multiple orbital angular momentum beams10.1038/s41598-020-80179-32045-2322https://doaj.org/article/172382cfc3754222b822b7df2041d5fc2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-80179-3https://doaj.org/toc/2045-2322Abstract Orbital-angular-momentum (OAM) multiplexing has been utilized to increase the channel capacity in both millimeter-wave and optical domains. Terahertz (THz) wireless communication is attracting increasing attention due to its broadband spectral resources. Thus, it might be valuable to explore the system performance of THz OAM links to further increase the channel capacity. In this paper, we study through simulations the fundamental system-degrading effects when using multiple OAM beams in THz communications links under atmospheric turbulence. We simulate and analyze the effects of divergence, turbulence, limited-size aperture, and misalignment on the signal power and crosstalk of THz OAM links. We find through simulations that the system-degrading effects are different in two scenarios with atmosphere turbulence: (a) when we consider the same strength of phasefront distortion, faster divergence (i.e., lower frequency; smaller beam waist) leads to higher power leakage from the transmitted mode to neighbouring modes; and (b) however, when we consider the same atmospheric turbulence, the divergence effect tends to affect the power leakage much less, and the power leakage increases as the frequency, beam waist, or OAM order increases. Simulation results show that: (i) the crosstalk to the neighbouring mode remains < − 15 dB for a 1-km link under calm weather, when we transmit OAM + 4 at 0.5 THz with a beam waist of 1 m; (ii) for the 3-OAM-multiplexed THz links, the signal-to-interference ratio (SIR) increases by ~ 5–7 dB if the mode spacing increases by 1, and SIR decreases with the multiplexed mode number; and (iii) limited aperture size and misalignment lead to power leakage to other modes under calm weather, while it tends to be unobtrusive under bad weather.Zhe ZhaoRunzhou ZhangHao SongKai PangAhmed AlmaimanHuibin ZhouHaoqian SongCong LiuNanzhe HuXinzhou SuAmir MinoofarHirofumi SasakiDoohwan LeeMoshe TurAndreas F. MolischAlan E. WillnerNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Zhe Zhao Runzhou Zhang Hao Song Kai Pang Ahmed Almaiman Huibin Zhou Haoqian Song Cong Liu Nanzhe Hu Xinzhou Su Amir Minoofar Hirofumi Sasaki Doohwan Lee Moshe Tur Andreas F. Molisch Alan E. Willner Modal coupling and crosstalk due to turbulence and divergence on free space THz links using multiple orbital angular momentum beams
description	Abstract Orbital-angular-momentum (OAM) multiplexing has been utilized to increase the channel capacity in both millimeter-wave and optical domains. Terahertz (THz) wireless communication is attracting increasing attention due to its broadband spectral resources. Thus, it might be valuable to explore the system performance of THz OAM links to further increase the channel capacity. In this paper, we study through simulations the fundamental system-degrading effects when using multiple OAM beams in THz communications links under atmospheric turbulence. We simulate and analyze the effects of divergence, turbulence, limited-size aperture, and misalignment on the signal power and crosstalk of THz OAM links. We find through simulations that the system-degrading effects are different in two scenarios with atmosphere turbulence: (a) when we consider the same strength of phasefront distortion, faster divergence (i.e., lower frequency; smaller beam waist) leads to higher power leakage from the transmitted mode to neighbouring modes; and (b) however, when we consider the same atmospheric turbulence, the divergence effect tends to affect the power leakage much less, and the power leakage increases as the frequency, beam waist, or OAM order increases. Simulation results show that: (i) the crosstalk to the neighbouring mode remains < − 15 dB for a 1-km link under calm weather, when we transmit OAM + 4 at 0.5 THz with a beam waist of 1 m; (ii) for the 3-OAM-multiplexed THz links, the signal-to-interference ratio (SIR) increases by ~ 5–7 dB if the mode spacing increases by 1, and SIR decreases with the multiplexed mode number; and (iii) limited aperture size and misalignment lead to power leakage to other modes under calm weather, while it tends to be unobtrusive under bad weather.
format	article
author	Zhe Zhao Runzhou Zhang Hao Song Kai Pang Ahmed Almaiman Huibin Zhou Haoqian Song Cong Liu Nanzhe Hu Xinzhou Su Amir Minoofar Hirofumi Sasaki Doohwan Lee Moshe Tur Andreas F. Molisch Alan E. Willner
author_facet	Zhe Zhao Runzhou Zhang Hao Song Kai Pang Ahmed Almaiman Huibin Zhou Haoqian Song Cong Liu Nanzhe Hu Xinzhou Su Amir Minoofar Hirofumi Sasaki Doohwan Lee Moshe Tur Andreas F. Molisch Alan E. Willner
author_sort	Zhe Zhao
title	Modal coupling and crosstalk due to turbulence and divergence on free space THz links using multiple orbital angular momentum beams
title_short	Modal coupling and crosstalk due to turbulence and divergence on free space THz links using multiple orbital angular momentum beams
title_full	Modal coupling and crosstalk due to turbulence and divergence on free space THz links using multiple orbital angular momentum beams
title_fullStr	Modal coupling and crosstalk due to turbulence and divergence on free space THz links using multiple orbital angular momentum beams
title_full_unstemmed	Modal coupling and crosstalk due to turbulence and divergence on free space THz links using multiple orbital angular momentum beams
title_sort	modal coupling and crosstalk due to turbulence and divergence on free space thz links using multiple orbital angular momentum beams
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/172382cfc3754222b822b7df2041d5fc
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Modal coupling and crosstalk due to turbulence and divergence on free space THz links using multiple orbital angular momentum beams

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