Laser-based visible light communications and underwater wireless optical communications: a device perspective

Shen, Chao; Alkhazragi, Omar; Sun, Xiaobin; Guo, Yujian; Ng, Tien Khee; Ooi, Boon S.

doi:10.1117/12.2504681

Cited by 21 publications

(5 citation statements)

References 90 publications

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“…IFFT converts the frequency domain input signals into time-domain output signals. A cyclic prefix (CP) is added further to limit the effect of ISI [35], [36]. The OFDM signal can be expressed as:…”

Section: Orthogonal Frequency-division Multiplexingmentioning

confidence: 99%

Diffused-Line-of-Sight Communication for Mobile and Fixed Underwater Nodes

et al. 2020

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The misalignment of mobile underwater wireless optical communication (UWOC) systems, compounded by turbulence in underwater scenarios, is a practical problem that can be resolved through various means. This work describes a pulse-position-modulation-based (PPM-based) diffusedline-of-sight UWOC system that offers a solution to this issue. PPM is found to be power-efficient and, in terms of bit-error-ratio performance, outperforms on-off keying modulation and orthogonal frequency-division multiplexing modulation in complex dynamic underwater channels. Through indoor experiments and outdoor deployment, we validated the robustness of the proposed PPM-based mobile UWOC system. This work sheds light on the practical implementation of UWOC networks for relieving the strict positioning-alignment-and-tracking requirements when an underwater apparatus is transmitting or receiving signals on the fly.

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Section: Orthogonal Frequency-division Multiplexingmentioning

confidence: 99%

Diffused-Line-of-Sight Communication for Mobile and Fixed Underwater Nodes

et al. 2020

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“…Importantly, VLC can utilize existing lighting infrastructure to provide dual functionality in illumination and communication, serving as an effective supplement to existing wireless networks, known as light fidelity (LiFi) [4,5]. Research on VLC over the past decades has made significant progress, achieving breakthroughs in communication rates through the optimization of transmitter and receiver devices, advancements in modulation and equalization algorithms, and the application of multiple-input multiple-output (MIMO) technology [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Laser-Based Mobile Visible Light Communication System

Hou,

Wang,

et al. 2024

Sensors

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Mobile visible light communication (VLC) is key for integrating lighting and communication applications in the 6G era, yet there exists a notable gap in experimental research on mobile VLC. In this study, we introduce a mobile VLC system and investigate the impact of mobility speed on communication performance. Leveraging a laser-based light transmitter with a wide coverage, we enable a light fidelity (LiFi) system with a mobile receiving end. The system is capable of supporting distances from 1 m to 4 m without a lens and could maintain a transmission rate of 500 Mbps. The transmission is stable at distances of 1 m and 2 m, but an increase in distance and speed introduces interference to the system, leading to a rise in the Bit Error Rate (BER). The mobile VLC experimental system provides a viable solution to the issue of mobile access in the integration of lighting and communication applications, establishing a solid practical foundation for future research.

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“…In the future 6G wireless system, VLC is also considered as one of the promising candidates [16,17]. In addition, VLC could also provide many value-added functions of lighting, including underwater optical wireless communication (UWOC) [18][19][20][21], visible light positioning (VLP) [22][23][24][25], and optical camera communication (OCC) [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Bi-directional Free-Space Visible Light Communication (VLC) Supporting Multiple Moveable Clients Using Special Light Diffusing Optical Fiber (LDOF)

Chang¹,

Chow²,

Lin³

et al. 2023

Preprint

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Visible light communication (VLC) can offer the advantages of license and electromagnetic interference (EMI) free wireless transmission. As optical signal does not interference with the radio-frequency (RF) signal, VLC can be used to augment RF wireless communication to provide extra communication capacity while without degrading the performance of both signals. In order to achieve high performance VLC transmission, optical alignment between the optical transmit (Tx) and receiver (Rx) is very critical to enhance the received signal-to-noise ratio (SNR). Optical beam-steering at the Tx can be utilized to ensure narrow optical beam can reach the Rx; however, complicated and active tracking are required. Lenses or compound parabolic concentrators (CPCs) can be install in front of the Rx for focusing to enhance the SNR. However, these will limit the Rx field-of-view (FOV) and making the VLC transmission more subjected to misalignment issue. Hence, many creative optical antennas have been proposed and demonstrated using special optical materials as well as special Rx to enhance the FOV of VLC systems. However, they have their limitations, such as data rates and FOVs. In this work, we put forward and demonstrate a bi-direction free-space VLC system supporting multiple moveable Rxs using a light-diffusing optical fiber (LDOF). The downlink (DL) signal is launched from an head-end or central office (CO) far away to the LDOF at the client side via a free-space transmission. When the DL signal is launched to the LDOF, which acts as an optical antenna to re-transmit the DL signal to different moveable Rxs. The uplink (UL) signal is sent via the LDOF towards the CO. In a proof-of-concept demonstration, the LDOF is 100 cm long and the free space VLC transmission between the CO and the LDOF is 100 cm. 210 Mbit/s DL and 850 Mbit/s UL transmissions, meeting the pre-forward-error-correction bit error rate (pre-FEC BER = 3.8 × 10−3) threshold are achieved.

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Laser-based visible light communications and underwater wireless optical communications: a device perspective

Cited by 21 publications

References 90 publications

Diffused-Line-of-Sight Communication for Mobile and Fixed Underwater Nodes

Diffused-Line-of-Sight Communication for Mobile and Fixed Underwater Nodes

Laser-Based Mobile Visible Light Communication System

Bi-directional Free-Space Visible Light Communication (VLC) Supporting Multiple Moveable Clients Using Special Light Diffusing Optical Fiber (LDOF)

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