Theoretical analyses on orbital angular momentum modes in conventional graded-index multimode fibre

Abstract Orbital angular momentum (OAM) modes are another mode basis to represent spatial modes. There have been increasing interests in exploiting OAM modes in specialty fibres. In this paper, we present a comprehensive characterisation of OAM modes in conventional graded-index multimode fibre (MMF...

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Autores principales:	Shi Chen, Jian Wang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/2af8d4f517a54364b8b28e59084d2f6f
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spelling	oai:doaj.org-article:2af8d4f517a54364b8b28e59084d2f6f2021-12-02T16:06:24ZTheoretical analyses on orbital angular momentum modes in conventional graded-index multimode fibre10.1038/s41598-017-04380-72045-2322https://doaj.org/article/2af8d4f517a54364b8b28e59084d2f6f2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04380-7https://doaj.org/toc/2045-2322Abstract Orbital angular momentum (OAM) modes are another mode basis to represent spatial modes. There have been increasing interests in exploiting OAM modes in specialty fibres. In this paper, we present a comprehensive characterisation of OAM modes in conventional graded-index multimode fibre (MMF). 1) We synthesise the circularly polarized OAM modes by properly combining two fold degenerate cylindrical vector modes (eigenmodes) and analyse the total angular momentum, i.e. spin angular momentum and orbital angular momentum. 2) We divide all the OAM modes of the conventional graded-index MMF into 10 OAM mode groups with effective refractive index differences between different mode groups above 10−4 enabling low-level inter-group crosstalk. 3) We study the chromatic dispersion, differential group delay, effective mode area, and nonlinearity for each OAM mode group over a wide wavelength ranging from 1520 to 1630 nm covering the whole C band and L band. 4) We discuss the performance tolerance to fibre ellipticity and bending. 5) We further address the robustness of performance against fibre perturbations including the core size, index contrast and the imperfect index profile of the practically fabricated MMFs. The obtained results may provide theoretical basis for further space-division multiplexing applications employing OAM modes in conventional graded-index MMF.Shi ChenJian WangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-15 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Shi Chen Jian Wang Theoretical analyses on orbital angular momentum modes in conventional graded-index multimode fibre
description	Abstract Orbital angular momentum (OAM) modes are another mode basis to represent spatial modes. There have been increasing interests in exploiting OAM modes in specialty fibres. In this paper, we present a comprehensive characterisation of OAM modes in conventional graded-index multimode fibre (MMF). 1) We synthesise the circularly polarized OAM modes by properly combining two fold degenerate cylindrical vector modes (eigenmodes) and analyse the total angular momentum, i.e. spin angular momentum and orbital angular momentum. 2) We divide all the OAM modes of the conventional graded-index MMF into 10 OAM mode groups with effective refractive index differences between different mode groups above 10−4 enabling low-level inter-group crosstalk. 3) We study the chromatic dispersion, differential group delay, effective mode area, and nonlinearity for each OAM mode group over a wide wavelength ranging from 1520 to 1630 nm covering the whole C band and L band. 4) We discuss the performance tolerance to fibre ellipticity and bending. 5) We further address the robustness of performance against fibre perturbations including the core size, index contrast and the imperfect index profile of the practically fabricated MMFs. The obtained results may provide theoretical basis for further space-division multiplexing applications employing OAM modes in conventional graded-index MMF.
format	article
author	Shi Chen Jian Wang
author_facet	Shi Chen Jian Wang
author_sort	Shi Chen
title	Theoretical analyses on orbital angular momentum modes in conventional graded-index multimode fibre
title_short	Theoretical analyses on orbital angular momentum modes in conventional graded-index multimode fibre
title_full	Theoretical analyses on orbital angular momentum modes in conventional graded-index multimode fibre
title_fullStr	Theoretical analyses on orbital angular momentum modes in conventional graded-index multimode fibre
title_full_unstemmed	Theoretical analyses on orbital angular momentum modes in conventional graded-index multimode fibre
title_sort	theoretical analyses on orbital angular momentum modes in conventional graded-index multimode fibre
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/2af8d4f517a54364b8b28e59084d2f6f
work_keys_str_mv	AT shichen theoreticalanalysesonorbitalangularmomentummodesinconventionalgradedindexmultimodefibre AT jianwang theoreticalanalysesonorbitalangularmomentummodesinconventionalgradedindexmultimodefibre
_version_	1718385012324171776

Theoretical analyses on orbital angular momentum modes in conventional graded-index multimode fibre

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