Optical and Terahertz Wireless Technologies: the Race to 6G Communications

Shehata, Mohamed; Wang, Yitong; He, Jiayuan; Kandeepan, Sithamparanathan; Wang, Ke

doi:10.1109/mwc.001.2300138

Cited by 5 publications

(1 citation statement)

References 9 publications

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“…Based on such a high potential, VLC has been found to be appropriate for numerous applications, from high-data-rate indoor applications [2] to underwater communication [3], and more recently, for Internet of Things applications [4]. Moreover, VLC is capable of having a major impact on the development of 6G-and-beyond technologies [5,6]. In addition, intensive research efforts have demonstrated that VLC can provide high-precision positioning [7], opening the path for a multitude of new applications.…”

Section: Introductionmentioning

confidence: 99%

Driving toward Connectivity: Vehicular Visible Light Communications Receiver with Adaptive Field of View for Enhanced Noise Resilience and Mobility

Căilean,

Avătămăniței,

Beguni

2024

Sensors

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Wireless communication represents the basis for the next generation of vehicle safety systems, whereas visible light communication (VLC) is one of the most suitable technologies for this purpose. In this context, this work introduces a novel VLC receiver architecture that integrates a field-of-view (FoV) adaptation mechanism in accordance with the optical noise generated by the sun. In order to demonstrate the benefits of this concept, a VLC prototype was experimentally tested in an infrastructure-to-vehicle (I2V) VLC configuration, which uses an LED traffic light as the transmitter. At the receiver side, an automatic FoV adaptation mechanism was designed based on a mechanical iris placed in front of a photodetector. Adjustments were made based on the values recorded by a multi-angle light sensor, built with an array of IR photodiodes covering an elevation from 0° to 30° and an azimuth from −30° to 30°. Depending on the incidence of solar light, the mechanical iris can adjust the FoV from ±1° to ±22°, taking into account both the light irradiance and the sun’s position relative to the VLC receiver. For experimental testing, two identical VLC receivers were used: one with an automatic FoV adjustment, and the other with a ±22° fixed FoV. The test results performed at a distance of 50 m, in the presence of solar irradiance reaching up to 67,000 µW/cm2, showed that the receiver with a fixed FoV saturated and lost the communication link most of the time, whereas the receiver with an adjustable FoV maintained an active link throughout the entire period, with a bit error rate (BER) of less than 10−7.

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Section: Introductionmentioning

confidence: 99%

Driving toward Connectivity: Vehicular Visible Light Communications Receiver with Adaptive Field of View for Enhanced Noise Resilience and Mobility

Căilean,

Avătămăniței,

Beguni

2024

Sensors

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100 Gbps Indoor Access and 4.8 Gbps Outdoor Point-to-Point LiFi Transmission Systems Using Laser-Based Light Sources

Chen,

Das,

Videv

et al. 2024

J. Lightwave Technol.

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Polarization-insensitive terahertz ultra-wideband absorber with an actively tunable bandwidth

Li,

Meng,

Hou

et al. 2024

Appl. Opt.

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This study presents a novel, to our knowledge, polarization-insensitive terahertz absorber with an actively adjustable bandwidth. The absorber consists of a vertically stacked three-layer structure with target-shaped resonant layers. Its absorption bandwidth is dynamically controlled, exhibiting ultra-broadband characteristics in the metallic phase. The absorber achieves over 90% absorption from 1.8 to 31.7 THz, with a relative bandwidth of 178%. In the insulating phase, the device transforms into a narrowband absorber, showing a precise absorption peak within the 0 to 20 THz frequency range. Notably, this absorber demonstrates polarization-insensitive and wide-angle absorption properties, making it suitable for different application scenarios. Compared to traditional broadband absorbers, the absorber proposed in this study features an ultra-wide absorption bandwidth and switchable operating modes, enhancing its flexibility and adaptability. The excellent performance of the absorber indicates its suitability for various applications, such as sixth-generation (6G) wireless communication, security detection, imaging, military stealth technology, and energy harvesting.

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Optical and Terahertz Wireless Technologies: the Race to 6G Communications

Cited by 5 publications

References 9 publications

Driving toward Connectivity: Vehicular Visible Light Communications Receiver with Adaptive Field of View for Enhanced Noise Resilience and Mobility

Driving toward Connectivity: Vehicular Visible Light Communications Receiver with Adaptive Field of View for Enhanced Noise Resilience and Mobility

100 Gbps Indoor Access and 4.8 Gbps Outdoor Point-to-Point LiFi Transmission Systems Using Laser-Based Light Sources

Polarization-insensitive terahertz ultra-wideband absorber with an actively tunable bandwidth

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