Optical wireless communication

Haas, Harald; Elmirghani, Jaafar M. H.; White, I.H.

doi:10.1098/rsta.2020.0051

Cited by 75 publications

(43 citation statements)

References 38 publications

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“…Therefore, there is a need to explore other parts of the electromagnetic spectrum for wireless data access to combat the RF spectrum crunch. In this context, optical wireless communication (OWC) is of particular interest because it uses a vast and unregulated optical spectrum 4 . In particular, Light-Fidelity (LiFi), which is defined as a bidirectional, high-speed and fully networked OWC system, is a proven solution for mobile wireless networking 5 .…”

Section: Introductionmentioning

confidence: 99%

Organic photovoltaics for simultaneous energy harvesting and high-speed MIMO optical wireless communications

Tavakkolnia

Jagadamma

Bian³

et al. 2021

Light Sci Appl

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We show that organic photovoltaics (OPVs) are suitable for high-speed optical wireless data receivers that can also harvest power. In addition, these OPVs are of particular interest for indoor applications, as their bandgap is larger than that of silicon, leading to better matching to the spectrum of artificial light. By selecting a suitable combination of a narrow bandgap donor polymer and a nonfullerene acceptor, stable OPVs are fabricated with a power conversion efficiency of 8.8% under 1 Sun and 14% under indoor lighting conditions. In an optical wireless communication experiment, a data rate of 363 Mb/s and a simultaneous harvested power of 10.9 mW are achieved in a 4-by-4 multiple-input multiple-output (MIMO) setup that consists of four laser diodes, each transmitting 56 mW optical power and four OPV cells on a single panel as receivers at a distance of 40 cm. This result is the highest reported data rate using OPVs as data receivers and energy harvesters. This finding may be relevant to future mobile communication applications because it enables enhanced wireless data communication performance while prolonging the battery life in a mobile device.

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Section: Introductionmentioning

confidence: 99%

Organic photovoltaics for simultaneous energy harvesting and high-speed MIMO optical wireless communications

Tavakkolnia

Jagadamma

Bian³

et al. 2021

Light Sci Appl

Self Cite

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“…The CCI occurs also when interfering signals reflect from the reflecting surfaces of the indoor environments and these reflected signals land on the optical receiver 17 . The CCI can be reduced by increasing distances between APs and decrease the coverage area of each AP 18 . However, this leads to a decrease of the overlap area between APs and make the illumination level under the desired value.…”

Section: Introductionmentioning

confidence: 99%

Collaborative Transmitters Management for Multi‐user Indoor VLC Systems

Younus

2021

Trans Emerging Tel Tech

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The main encounters face visible light communication (VLC) systems to provide high data rates for multiuser scenario are intersymbol interference (ISI) and cochannel interference (CCI). This work proposes delay adaptation technique (DAT) in conjunction with power adaptation technique (PAT) to improve the performance of the multiuser indoor VLC systems. The DAT is used to reduce the ISI while the PAT is utilized to reduce the CCI. To apply the DAT and PAT, each access point (AP) requires to share its information with the controller, which is responsible to manage the connection between user equipment (UEs) and APs. Therefore, each AP is given a control signal (an unmodulated unique tone signal). These control signals are utilized to set‐up the connection between APs and UEs (allocate each UE its best APs, which are APs that offer good connection links). Our proposed system performance is evaluated in a realistic room while considering the effect of diffuse reflections and CCI and using on‐off‐keying modulation. The results reveal that a remarkable improvement in the VLC system's performance with using DAT and PAD compared with the VLC system without using DAT and PAT.

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“…Data traffic steadily increases and there is also a large growth in radio wireless communication. Optical wireless communication (OWC) [1][2][3][4], visible light communication (VLC) [5][6][7] and light fidelity (LiFi) [8,9] can take over part of the data traffic, especially indoor within rooms and offices. An advantage is a gain in comfort, when devices do not have to be connected by wires or cables.…”

Section: Introductionmentioning

confidence: 99%

Bit Error Performance of APD and SPAD Receivers in Optical Wireless Communication

Mahmoudi

Zimmermann

2021

Electronics

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This review concentrates on the state-of-the-art hardware-oriented receiver aspects for optical wireless communication (OWC), and points to the importance of BER performance analysis and modeling in presence of non-perpendicular light incidence. Receivers in OWC networks for 6G applications have to work for strongly different light incidence angles, to allow the formation of connections to locally separated transceivers without the need for rotation units and accurate adjustment. In turn, and in combination with fully integrated optical receivers, reduction of cost and increased comfort can be achieved. Fully integrated [bipolar] complementary metal-oxide-semiconductor ([Bi]CMOS) receivers with on-chip avalanche photodiodes (APDs) and single-photon avalanche diodes (SPADs) are presented and their performance in optical wireless communication is summarized. Impressive data rates up to 2 Gbit/s and free-space transmission distances up to 27 m at bit error ratios (BER) below 10−9 are reached with linear-mode APD receivers. The importance of optical interference in the isolation and passivation stack on top of the integrated photodiodes is illuminated. To be able to predict the dependence of the BER of single-photon avalanche diode (SPAD) receivers on the light incidence angle, a model, which includes a model for the photon detection probability and a standing-wave model for the isolation and passivation stack, is extended. The dependence of the BER on the light incidence angle onto the photodiodes is investigated by electromagnetic simulation for optical transmission of the layers on top of the photodiode, device simulation for the avalanche triggering probability and BER modeling with MATLAB. It is found that incidence angles up to 30° have moderate influence on the BER and that the BER degrades significantly for incidence angles larger than 50°.

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Optical wireless communication

Cited by 75 publications

References 38 publications

Organic photovoltaics for simultaneous energy harvesting and high-speed MIMO optical wireless communications

Organic photovoltaics for simultaneous energy harvesting and high-speed MIMO optical wireless communications

Collaborative Transmitters Management for Multi‐user Indoor VLC Systems

Bit Error Performance of APD and SPAD Receivers in Optical Wireless Communication

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