Wavefront spatial‐phase modulation in visible optical communications

Sabino, João; Figueira, Gonçalo; André, Paulo

doi:10.1002/mop.30583

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…When T consecutive trials have been made without improving ∆P 2 we claim convergence and move to the next value of M . In a typical experimental run, M = [120, 48,24,12,6], and T = 30. After all values of M have been exhausted, we move to the individual element phase.…”

Section: Generating Coldspotsmentioning

confidence: 99%

“…We show that this can be achieved through programmable metasurfaces, which increase the available Degrees of Freedom (DOF) by manipulating boundary conditions [7][8][9]. In recent years, these devices have enabled novel concepts in * Benjamin.Frazier@jhuapl.edu a wide variety of applications throughout the microwave and optical domains [10][11][12][13][14][15][16]. The additional DOF in turn enhance diversity in space and time [17][18][19][20], and allow intricate control of the underlying scattering system; combining a programmable metasurface with a cavity unlocks applications not possible with a fixed system [21][22][23] and encourages research in new and under-explored domains [24].…”

Section: Introductionmentioning

confidence: 99%

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Wavefront Shaping with a Tunable Metasurface: Creating Coldspots and Coherent Perfect Absorption at Arbitrary Frequencies

Frazier,

Antonsen,

Anlage

et al. 2020

Preprint

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Section: Generating Coldspotsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wavefront Shaping with a Tunable Metasurface: Creating Coldspots and Coherent Perfect Absorption at Arbitrary Frequencies

Frazier,

Antonsen,

Anlage

et al. 2020

Preprint

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“…Communication systems based on spatial light modulation exploit orbital angular moment (OAM) [6], [8]- [11] and polarization [12], [13] degrees of freedom in free space and fiber optical communications. In addition, visible light communications (VLC) systems exploit spatial light modulators to realize spatially variant polarization states [12], [14]. On the other hand, in spatial light modulation based optical communication architectures, detectors include holographic gratings, various interferometer structures, po-larizers or additional spatial light modulators with detailed reviews presented in [10] and [15].…”

Section: Introductionmentioning

confidence: 99%

Theory and Experiment of Spatial Light Modulation and Demodulation With Multi-Plane Diffraction and Applications

Gülbahar

Oksuz

2023

IEEE Access

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Spatial light modulation enhances capacity of optical communications by modulating spatial amplitude, phase and polarization degrees of freedom with recent success of orbital angular momentum based architectures. There is a hardware challenge to demodulate large symbol families or high order symbols requiring a general design of spatial light demodulation. Multi-plane diffraction (MPD) recently introduced for improving spatial modulation capabilities in free space optical channels promises utilization at the receiver side as a demodulator. In this article, we theoretically model, numerically simulate and experimentally implement spatial light demodulation based on MPD. Numerical simulations and experimental implementations verify capabilities of MPD for increasing inter-symbol distances at the detector front-end. We obtain approximately two times improvement compared with direct detection for basic design including three diffraction planes as a proof-of-concept and improved performance with increasing number of diffraction planes compared with state-of-the-art single-plane diffraction (SPD) based interferometric receivers. Besides that, we perform, for the first time, experimental implementation of MPD based spatial light modulation. In addition, symmetric-key cryptography application of the proposed system is theoretically presented with low decoder complexity while numerical simulations promise high performance security against intruders. MPD based design is practically applicable and promising for diverse optical architectures including both communications and cryptography as a low-cost, low hardware complexity, passive and high performance design.

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“…F. Feng et al proposed to use an SLM as a Gaussian-beam steerer to implement narrow beam optical beam steered data transmission [10] a multiple-input-multiple-output (MIMO) visible light communication (VLC) system enabled by a digital-micromirrordevice-based (DMD-based) SLM using the mechanical beam steering concept [11]. More similar wavefront shaping applied to OWC has been achieved to provide multi-delivery [12] and focus a radiating light from a vertical-cavity surface-emitting laser (VCSEL) [13]. However, all the mentioned techniques only address the relatively simpler LOS issues.…”

mentioning

confidence: 99%

Wide-Coverage Beam-Steered 40-Gbit/s Non-Line-of-Sight Optical Wireless Connectivity for Industry 4.0

Zhang

Cao

et al. 2020

J. Lightwave Technol.

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In the coming Industry 4.0, there is a long-standing challenge to transfer real-time broadband data (e.g., video monitoring data) among machines. Optical wireless communication (OWC), which can easily carry tens of gigabit/s data, is a promising technology but suffering from non-line-of-sight (NLOS) limitation. In the NLOS scenario, the power of diffused light is heavily attenuated while the diffuse-induced multi-path effect suppresses the band-width of received signals. In this article, the diffuse light reflected off a rough surface (e.g., ceilings or walls) can be focused at a target receiver with an average 18-dB-power-enhancement. A record 40-Gbit/s >80°-coverage beam-steered NLOS OWC system enabled by the proposed diffuse reflection focusing (DRF) is experimentally demonstrated over a diffused 25-cm free-space link. The fast-focusing transmission matrix (TM) algorithm, which takes only 513 iterations to do the focusing, is introduced to make the DRF technique more practical for daily applications. The lowcost intensity-modulation/direct-detection (IM-DD) transmission scheme and the simple on-off keying (OOK) signal are selected to support low-cost applications. All these features exhibit its great potential for high-speed indoor wireless communications, especially in the scenarios of Industry 4.0.

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Wavefront spatial‐phase modulation in visible optical communications

Cited by 5 publications

References 8 publications

Wavefront Shaping with a Tunable Metasurface: Creating Coldspots and Coherent Perfect Absorption at Arbitrary Frequencies

Wavefront Shaping with a Tunable Metasurface: Creating Coldspots and Coherent Perfect Absorption at Arbitrary Frequencies

Theory and Experiment of Spatial Light Modulation and Demodulation With Multi-Plane Diffraction and Applications

Wide-Coverage Beam-Steered 40-Gbit/s Non-Line-of-Sight Optical Wireless Connectivity for Industry 4.0

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