Recent advances in high-capacity free-space optical and radio-frequency communications using orbital angular momentum multiplexing

Willner, Alan E.; Ren, Yongxiong; Xie, Guodong; Yan, Yan; Li, Long; Zhao, Zhe; Wang, Jian; Tur, Moshe; Molisch, Andreas F.; Ashrafi, Solyman

doi:10.1098/rsta.2015.0439

Cited by 161 publications

(82 citation statements)

References 83 publications

(162 reference statements)

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“…The possibility to exploit many optical carriers propagating at the same frequency with no interference, has aroused particular attention in the telecom field [11], which is constantly pursued by the worldwide restless demand for increasing bandwidth [12]. Besides wavelength, polarization, time, and amplitude/phase, the modulation and multiplexing of OAM promise to provide a significant increase in the information capacity of today's optical networks [13], both for free-space [14] and optical fibers communication [15,16]. However, the implementation of OAM-mode division multiplexing (OAM-MDM) in a real scenario is still restrained by the lack of the commercial devices to perform optically the typical operations required in an optical link.…”

Section: Introductionmentioning

confidence: 99%

Non-paraxial design and fabrication of a compact OAM sorter in the telecom infrared

Ruffato¹,

Massari

Girardi³

et al. 2019

Opt. Express

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A novel optical device is designed and fabricated in order to overcome the limits of the traditional sorter based on log-pol optical transformation for the demultiplexing of optical beams carrying orbital angular momentum (OAM). The proposed configuration simplifies the alignment procedure and significantly improves the compactness and miniaturization level of the optical architecture. Since the device requires to operate beyond the paraxial approximation, a rigorous formulation of transformation optics in the non-paraxial regime has been developed and applied. The sample has been fabricated as 256-level phase-only diffractive optics with high-resolution electron-beam lithography, and tested for the demultiplexing of OAM beams at the telecom wavelength of 1310 nm. The designed sorter can find promising applications in next-generation optical platforms for mode-division multiplexing based on OAM modes both for free-space and multi-mode fiber transmission.

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Section: Introductionmentioning

confidence: 99%

Non-paraxial design and fabrication of a compact OAM sorter in the telecom infrared

Ruffato¹,

Massari

Girardi³

et al. 2019

Opt. Express

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“…These aspects are represented by papers dealing with the use of OAM beams for free-space communication [52] and propagation through photonic crystal fibres [53].…”

Section: Recent Developments and This Theme Issuementioning

confidence: 99%

Optical orbital angular momentum

Barnett

Babiker

Padgett

2017

Phil. Trans. R. Soc. A.

113

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We present a brief introduction to the orbital angular momentum of light, the subject of our theme issue and, in particular, to the developments in the 13 years following the founding paper by Allen et al. (Allen et al. 1992 Phys. Rev. A 45 , 8185 ( doi:10.1103/PhysRevA.45.8185 )). The papers by our invited authors serve to bring the field up to date and suggest where developments may take us next. This article is part of the themed issue ‘Optical orbital angular momentum’.

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“…This says that lower charge OAM modes are less deteriorated by the scattering layer. It would be because we have used a dense scatterer, which is expected to deteriorate the stability of the propagating OAM mode strongly [36,37], resulting in fracturing of the OAM mode. However in the p = 2 case, the range of topological charge under study seems to be affected in the same way, which is why the deviation is more or less a constant with a slightly increasing trend.…”

Section: Discussionmentioning

confidence: 99%

A compact single channel interferometer to study vortex beam propagation through scattering layers

Lathika

Anand

Bhattacharya

2020

Sci Rep

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We propose and demonstrate a single channel interferometer that can be used to study how vortex beams propagate through a scatterer. The interferometer consists of a multifunctional diffractive optical element (MDOE) synthesized by the spatial random multiplexing of a Fresnel zone plate and a spiral Fresnel zone plate with different focal lengths. The MDOE generates two co-propagating beams, such that only the beam carrying orbital angular momentum is modulated by an annular stack of thin scatterers located at the focal plane of the Fresnel zone plate, while the other beam passes through the centre of the annulus without any modulation. The interference pattern is recorded at the focal plane of the spiral Fresnel zone plate. The scattering of vortex beams through stacks consisting of different number of thin scatterers was studied using the proposed optical setup. Conflicting results have been reported earlier on whether higher or lower charge beams suffer more deterioration. The proposed interferometer provides a relatively simple and compact means of experimentally studying propagation of vortex beams through scattering medium.

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Recent advances in high-capacity free-space optical and radio-frequency communications using orbital angular momentum multiplexing

Abstract: One contribution of 14 to a theme issue 'Optical orbital angular momentum'.

Cited by 161 publications

References 83 publications

Non-paraxial design and fabrication of a compact OAM sorter in the telecom infrared

Non-paraxial design and fabrication of a compact OAM sorter in the telecom infrared

Optical orbital angular momentum

A compact single channel interferometer to study vortex beam propagation through scattering layers

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