Data information transfer using complex optical fields: a review and perspective (Invited Paper)

Wang, Jian

doi:10.3788/col201715.030005

Cited by 81 publications

(15 citation statements)

References 48 publications

(51 reference statements)

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“…LP modes can be regarded as the proper linear combination of eigenmodes guided by the FMF and MMF. Very recently, the modulation and multiplexing of orbital angular momentum (OAM) states of light in communication systems have gained much interest 9–12 , both in free-space optical communications 13–19 and fibre-optic transmission systems 20–30 . OAM-carrying light beams are characterized by a helical phase front of exp( ilφ ), possessing an OAM of lħ per photon, where l is the topological charge number, φ corresponds to the azimuthal angle, and ħ is the reduced Planck constant 31, 32 .…”

Section: Introductionmentioning

confidence: 99%

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

Shi

Wang

2017

Sci Rep

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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.

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Section: Introductionmentioning

confidence: 99%

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

Shi

Wang

2017

Sci Rep

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“…These structured light beams have already been widely used in diverse applications, as shown in Figure 12. Utilizing multiple transverse structured light beams as independent data channels for multiplexing can greatly expand the transmission capacity and spectral efficiency of optical communications [1,[103][104][105]. Longitudinal structured light beams with bendable trajectories provide a new way to avoid obstacles in a free-space line-of-sight communication system [3,106].…”

Section: Prospect and Discussionmentioning

confidence: 99%

Generation and Detection of Structured Light: A Review

Wang

Liang

2021

Front. Phys.

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Structured light beams have rapidly advanced over the past few years, from specific spatial-transverse/longitudinal structure to tailored spatiotemporal structure. Such beams with diverse spatial structures or spatiotemporal structures have brought various breakthroughs to many fields, including optical communications, optical sensing, micromanipulation, quantum information processing, and super-resolution imaging. Thus, plenty of methods have been proposed, and lots of devices have been manufactured to generate structured light beams by tailoring the structures of beams in the space domain and the space–time domain. In this paper, we firstly give a brief introduction of different types of structured light. Then, we review the recent research progress in the generation and detection of structured light on different platforms, such as free space, optical fiber, and integrated devices. Finally, challenges and perspectives are also discussed.

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“…8,9 VBs are characterized by helical wavefronts [10][11][12][13] and are capable of carrying orbital angular momentum (OAM) because their equiphase surfaces rotate around the propagation direction, enabling the potential to develop OAM multiplexing communications. [14][15][16] As CVBs and VBs possess a polarization singularity and phase singularity, respectively, 9 they are also termed as singular beams and exhibit a similar doughnut-like intensity profile with a dark area at the center. 17,18 Spatially modulated structured light was first generated in free space based on discrete bulk-state elements.…”

Section: Introductionmentioning

confidence: 99%