In this paper, for the first time, we propose use of a hybrid post equalizer in high-order carrierless-amplitude-and-phase-modulation-based visible light communication (VLC) system. The consists linear equalizer, Volterra-series-based nonlinear and decision-directed least mean squares to simultaneously mitigate distortions VLC A commercially available red-blue-green-yellow light-emitting diode (RBGY LED) is utilized four-wavelength multiplexing. By an aggregate data rate 8 Gb/s...

Abstract Due to its unique intensity distribution, self-acceleration, and beam self-healing properties, Airy holds great potential for optical wireless communications in challenging channels, such as underwater environments. As a vital part of 6G network, the Internet Underwater Things requires high-stability, low-latency, high-capacity communication (UWOC). Currently, primary challenge UWOC lies prevalent time-varying complex channel characteristics. Conventional blue Gaussian beam-based...

In recent studies, visible light communication (VLC) has been predicted to be a prospective technique in the future 6G systems. To suit trend of exponentially growing connectivity, researchers have intensively studied techniques that enable multiple access (MA) VLC systems, such as MIMO system based on LED devices support potential applications Internet Things (IoT) or edge computing next-generation network. However, their transmission rate is limited due intrinsic bandwidth LED....

Abstract Multimode fiber (MMF) which supports parallel transmission of spatially distributed information is a promising platform for remote imaging and capacity-enhanced optical communication. However, the variability scattering MMF channel poses challenge achieving long-term accurate over long distances, static propagation modeling with calibrated matrix or data-driven learning will inevitably degenerate. In this paper, we present self-supervised dynamic approach that achieves long-term,...

We proposed a cascaded amplitude equalizer used for high speed visible light communications (VLC) system. With the pre-equalization circuit, -3dB bandwidth of VLC system can be extended from 17MHz to 366MHz using commercially available phosphorescent white LED, blue filter and differential outputs PIN receiver. The data rate is 1.60Gbit/s exploiting 16QAM-OFDM with 400MHz modulation over 1m free-space transmission under pre-forward error correction (pre-FEC) limit 3.8 × 10(-3). To our...

Inter-symbol interference (ISI) is one of the key problems that seriously limit transmission data rate in high-speed VLC systems. To eliminate ISI and further improve system performance, series equalization schemes have been widely investigated. As an adaptive algorithm commonly used wireless communication, RLS also suitable for visible light communication due to its quick convergence better performance. In this paper, first time we experimentally demonstrate a RGB-LED based WDM employing...

Visible light communication based on light-emitting diodes (LEDs) has become a promising candidate by providing high data rates, low latency, and secure for underwater environments. In this paper, self-designed common-anode GaN-based five-primary-color LED (RGBYC LED) Si substrate is proposed fabricated. The design of common anode used to mitigate the saturation effect low-frequency component. Additionally, compared with commercially available LEDs that suffer from nonlinearity distortion,...

The light-emitting diode nonlinearity in visible light communication (VLC) systems is considered to be a major problem that deteriorates system performance. In this paper, we experimentally demonstrate high-speed WDM CAP64 VLC employing Volterra series-based nonlinear equalizer mitigate the effect. A modified cascaded multimodulus algorithm (M-CMMA) utilized calculate error function and update weights of without using training symbols. An aggregate data rate 4.5 Gb/s successfully achieved...

In this paper, we present a high-speed visible light communication (VLC) system based on single commercially available phosphorescent white light-emitting diode (LED). system, preequalization circuit is used to extend the modulation bandwidth, and differential output receiver utilized reduce noise. With adaptive bit power allocation orthogonal frequency-division multiplexing (OFDM), experimentally demonstrated 2.0-Gb/s link over 1.5-m free-space transmission, BER under preforward error...

Metro network, as a medium distance transmission system, poses special challenge of capacity and cost. In this paper, we present detailed comparison applying three advanced modulation formats including pulse amplitude modulation-4 (PAM-4), carrierless phase modulation-16 QAM (CAP-16), discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S OFDM) with low-cost direct detection for 100-Gb/s/λ metro optical systems. These are all experimentally demonstrated similar...

Visible light communication (VLC) has emerged as a promising method in the special field of 6G, such intersatellite (ISC) and underwater wireless optical (UWOC). Green light-emitting diode (LED)-based visible is considered potential candidate for UWOC mobile autonomous vehicle (AUV) remotely operated vehicle, particularly coastal harbor environments. However, due to bandwidth limitations variable channels, implementing high-speed VLC remains challenge. In this paper, neural network-based...

Visible light communication (VLC), combining wireless with white lighting, has many advantages. It is free of electromagnetic interference, rich in spectrum resources, and a gigabit-per-second (Gbps) data rate. Laser diodes (LDs) are emerging as promising sources for high-speed VLC due to their high modulation bandwidth. In this paper, we demonstrate red/green/blue (R/G/B) LDs based system recorded rate 46.41 Gbps, employing discrete multitone (DMT) adaptive bit-loading technology achieve...

Seamless fiber-terahertz integrated communication has emerged as a promising technology in the special field of 6G, including mobile fronthaul and wireless bridges. Electronic terahertz systems have advantages high-level integration, small form factors, potentially low costs, but their drawbacks are bandwidths high harmonic interference levels. In this paper, an end-to-end learning-based waveform-to-waveform automatic equalization framework (W2WAEF) is proposed to overcome above shortcomings...

Nowadays, the demand for high-speed information transmission is increasing rapidly. Visible light communication (VLC) based on light-emitting diodes (LEDs) supposed as a potential candidate future 6G networks. However, an emerging field of optical communications, data rate VLC systems restricted to extremely limited modulation bandwidth and nonlinear characteristics optoelectronic devices. In this paper, we outline state art challenges VLC, introduce key technologies Silicon (Si) -substrate...

Visible light communication (VLC) based on laser diodes demonstrates great potential for high data rate maritime, terrestrial, and aerial wireless links. Here, we design fabricate high-speed blue (LDs) grown c -plane gallium nitride (GaN) substrate. This was achieved through active region miniaturization toward a narrow ridge waveguide, short cavity length, single longitudinal mode Fabry–Perot diode. The fabricated mini-LD has low threshold current of 31 mA slope efficiency 1.02 W/A. A...

A novel ultrahigh-speed LED visible light communication (VLC) local area network to provide beyond 10-Gb/s optical wireless access based on star topology architecture is proposed and experimentally demonstrated for massive users. Fiber link used as the backbone of bidirectional VLC network. The hybrid protocol utilized: 1) frequency division multiplexing downlink uplink fiber transmission 2) time transmission. full-duplex eight points (VAPs) has been successfully with total throughput 8...

In this letter, we proposed a constant-resistance symmetrical bridged-T amplitude equalizer for high-speed visible light communication (VLC) system. Using the hardware equalizer, successfully demonstrated gigabit per second VLC transmission over 80-cm free space based on RGB LED. The measured bit error rates (BERs) signals in 64-quadratic-amplitude modulation (64QAM) single carrier at 1.05-Gb/s, 64QAM-orthogonal frequency division multiplexing (OFDM) 1.05 Gb/s, and power loading OFDM 1.42...

Space cooling and heating consume a large proportion of global energy, so passive thermal management materials (i.e., without energy input), especially dual-mode including bifunctions, are becoming more attractive in many areas. Herein, function-switchable Janus membrane between consisting multilayer structure polyvinylidene fluoride nanofiber/zinc oxide nanosheet/carbon nanotube/Ag nanowire/polydimethylsiloxane was fabricated for comprehensive applications. In the mode, high radiation...

Visible light communication (VLC) has emerged as a promising method in 6G. However, the development of receiving devices is much slower than that transmitting devices, limited by materials, structures, and fabrication. In this paper, we propose fabricate an InGaN/GaN multiple-quantum-well-based vertical-structure micro-LED-based photodetector (μPD) on Si substrate. A comprehensive comparison photoelectrical performance three sizes μPDs, 10, 50, 100 μm, presented. The peak responsivity all...

Aside from ambient light noise, shot and linear/nonlinear effects, strong low-frequency noise (LFN) severely affects the signal quality in LED-based visible communication (VLC) systems, which hinders implementation of data-driven end-to-end (E2E) deep learning approaches real LED-VLC systems. We present a learning-based autoencoder to deal with this challenge. A novel modeling strategy is proposed bypass influence LFN other low signal-to-noise ratio data when training channel model our E2E...

Visible light communication (VLC) is a highly promising complement to conventional wireless for local-area networking in future 6G. However, the extra electro-optical and photoelectric conversions VLC systems usually introduce exceeding complexity channels, particular severe nonlinearities. Artificial intelligence (AI) techniques are investigated overcome unique challenges VLC, whereas considerable obstacles found practical applied with intelligent learning approaches. In this paper, we...

In the upcoming 6G, integrated sensing and communication (ISAC) system in millimeter wave (MMW) band will have a vital role numerous application scenarios, enhancing convenience of our lives. The photonic-based MMW ISAC can exploit broad bandwidth photonic devices, significantly improving performance. Furthermore, use devices enables seamless integration with fiber-wireless network. this paper, we proposed simple-structured W-band system, incorporating optical fiber transmission into system....

Using the designed amplitude equalization circuit, we first demonstrate highest data rate and longest transmission for VLC system with 750Mbit/s employing 64QAM-OFDM after 2m free-space transmission.