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Demonstration of a low‐complexity memory‐polynomial‐aided neural network equalizer for CAP visible‐light communication with superluminescent diode

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Opto-Electronic Advances 2020年第8期3卷 1-11页

作者： Fangchen Hu Jorge A.Holguin-Lerma Yuan Mao Peng Zou Chao shen Tien Khee Ng boon s.ooi Nan Chi Key Laboratory for Information science of Electromagnetic Waves(MoE) Fudan UniversityShanghai 200433China Photonics Laboratory King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia

Visible-light communication(VLC)stands as a promising component of the future communication network by providing high-capacity,low-latency,and high-security wireless *** diode(sLD)is proposed as a new light emitter in the VLC system due to its properties of droop-free emission,high optical power density,and low *** this paper,we analyze a VLC system based on sLD,demonstrating effective implementation of carrierless amplitude and phase modulation(CAP).We create a low-complexity memory-polynomial-aided neural network(MPANN)to replace the traditional finite impulse response(FIR)post-equalization filters of CAP,leading to significant mitigation of the linear and nonlinear distortion of the VLC *** MPANN shows a gain in Q factor of up to 2.7 dB higher than other equalizers,and more than four times lower complexity than a standard deep neural network(DNN),hence,the proposed MPANN opens a pathway for the next generation of robust and efficient neural network equalizers in *** experimentally demonstrate a proof-of-concept 2.95-Gbit/s transmission using MPANN-aided CAP with 16-quadrature amplitude modulation(16-QAM)through a 30-cm channel based on the 442-nm blue sLD emitter.

关键词： superluminescent diode visible-light communication neural network

Polarization-induced photocurrent switching effect in heterojunction photodiodes

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Nano Research 2023年第4期16卷 5503-5510页

作者： Dingbo Chen Yu-Chang Chen Guang Zeng Yu-Chun Li Xiao-Xi Li Dong Li Chao shen Nan Chi boon s.ooi David Wei Zhang Hong-Liang Lu state Key Laboratory of AsIC and system Shanghai Institute of Intelligent Electronics&SystemsSchool of MicroelectronicsFudan UniversityShanghai 200433China Key Laboratory for Information science of Electromagnetic Waves Department of Communication Science and EngineeringFudan UniversityShanghai 200433China Photonics Laboratory Division of ComputerElectricaland Mathematical Sciences and EngineeringKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia

The unipolar photocurrent in conventional photodiodes(PDs)based on photovoltaic effect limits the output modes and potential versatility of these devices in *** photodiodes with photocurrent switching are emerging as a promising solution for obtaining photoelectric devices with unique and attractive functions,such as optical logic ***,we design an all-solid-state chip-scale ultraviolet(UV)PD based on a hybrid GaN heterojunction with engineered bipolar polarized electric *** introducing the polarization-induced photocurrent switching effect,the photocurrent direction can be switched in response to the wavelength of incident light at 0 V *** particular,the photocurrent direction exhibits negative when the irradiation wavelength is less than 315 nm,but positive when the wavelength is longer than 315 *** device shows a responsivity of up to−6.7 mA/W at 300 nm and 5.3 mA/W at 340 nm,*** particular,three special logic gates in response to different dual UV light inputs are demonstrated via a single bipolar PD,which may be beneficial for future multifunctional UV photonic integrated devices and systems.

关键词： GaN heterostructure ultraviolet(UV)photodiodes bipolar photocurrent optical logic device

A flexible capacitive photoreceptor for the biomimetic retina

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Light(science & Applications) 2022年第1期11卷 38-49页

作者： Mani Teja Vijjapu Mohammed E.Fouda Agamyrat Agambayev Chun Hong Kang Chun-Ho Lin boon s.ooi Jr-Hau He Ahmed M.Eltawil Khaled N.salama sensors lab Advanced Membranes and Porous Materials CenterComputerElectrical and Mathematical Science and Engineering DivisionKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia Communication and Computing systems Lab ComputerElectrical and Mathematical Science and Engineering DivisionKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia Department of Electrical Engineering and Computer science University of California-IrvineIrvineCA 92612USA Department of Electrical Computer and Energy EngineeringArizona State UniversityTempeAZUSA Computer Electrical and Mathematical Science and Engineering DivisionKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia Department of Materials science and Engineering City University of Hong KongHong Kong SARChina

Neuromorphic vision sensors have been extremely beneficial in developing energy-efficient intelligent systems for robotics and privacy-preserving security *** is a dire need for devices to mimic the retina's photoreceptors that encode the light illumination into a sequence of spikes to develop such ***,we develop a hybrid perovskite-based flexible photoreceptor whose capacitance changes proportionally to the light intensity mimicking the retina's rod cells,paving the way for developing an efficient artificial retina *** proposed device constitutes a hybrid nanocomposite of perovskites(methyl-ammonium lead bromide)and the ferroelectric terpolymer(polyvinylidene fluoride trifluoroethylene-chlorofluoroethylene).A metal-insulator-metal type capacitor with the prepared composite exhibits the unique and photosensitive capacitive behavior at various light intensities in the visible light *** proposed photoreceptor mimics the spectral sensitivity curve of human photopic *** hybrid nanocomposite is stable in ambient air for 129 weeks,with no observable degradation of the composite due to the encapsulation of hybrid perovskites in the hydrophobic *** functionality of the proposed photoreceptor to recognize handwritten digits(MNIsT)dataset using an unsupervised trained spiking neural network with 72.05%recognition accuracy is *** demonstration proves the potential of the proposed sensor for neuromorphic vision applications.

关键词： perovskite illumination preserving

The effect of turbulence on NLOs underwater wireless optical communication channels [Invited]

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Chinese Optics Letters 2019年第10期17卷 80-87页

作者： Mohammed sait Xiaobin sun Omar Alkhazragi Nasir Alfaraj Meiwei Kong Tien Khee Ng boon s.ooi Photonics Laboratory King Abdullah University of Science and Technology (KAUST)

Conventional line-of-sight underwater wireless optical communication(UWOC)links suffer from huge signal fading in the presence of oceanic turbulence due to misalignment,which is caused by variations in the refractive index in the ***-line-of-sight(NLOs)communication,a novel underwater communication configuration,which has eased the requirements on the alignment,is supposed to enhance the robustness of the UWOC links in the presence of such *** Letter experimentally and statistically studies the impact of turbulence that arises from temperature gradient variations and the presence of different air bubble populations on NLOs optical *** results suggest that temperature gradient-induced turbulence causes negligible signal fading to the NLOs ***,the presence of air bubbles with different populations and sizes can enhance the received signal power by seizing the scattering phenomena from an ultraviolet 377 nm laser diode.

关键词： communication scattering turbulence

Free-space optical channel characterization in a coastal environment

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Journal of Communications and Information Networks 2017年第4期2卷 100-106页

作者： Wael G.Alheadary Ki-Hong Park boon s.ooi Mohamed-slim Alouini Computer Electricaland Mathematical Sciences and Engineering(CEMSE)DivisionKing Abdullah University of Science and Technology(KAUST)Thuwal23955-6900Saudi Arabia

Recently,FsO(Free-space Optical Communication)has received a lot of attention thanks to its high data-rate transmission via unbounded unlicensed ***,some weather conditions lead to significant degradation of the FsO link *** on this context and in order to have a better understanding of the capabilities of FsO communication in a coastal environment,the effects of temperature and humidity on an FsO system are investigated in this *** experiment is conducted using an open source FsO system that achieves a transmission rate of 1 Gbit/s at a distance of 70 *** new mathematical models are proposed to represent the effects of temperature and humidity on our developed FsO system operating at a wavelength of 1550 *** first model links the FsO attenuation coefficient to the air temperature in coastal regions,while the second model links the FsO attenuation coefficient to the humidity and the dew-point *** key finding of this study is that FsO links can achieve maximum availability in a coastal city with normal variations in temperature and humidity.

关键词： FsO optical systems relative humidity temperature channel characterization attenuation coefficient

Tapering-induced enhancement of light extraction efficiency of nanowire deep ultraviolet LED by theoretical simulations

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Photonics Research 2018年第5期6卷 457-462页

作者： RONGHUI LIN sERGIO VALDEs GALAN HAIDING sUN YANGRUI HU MOHD sHARIZAL ALIAs BILAL JANJUA TIEN KHEE NG boon s.ooi XIAOHANG LI Advanced semiconductor Laboratory King Abdullah University of Science and Technology (KAUST) Photonics Laboratory King Abdullah University of Science and Technology (KAUST)

A nanowire （NW） structure provides an alternative scheme for deep ultraviolet light emitting diodes （DUV-LEDs） that promises high material quality and better light extraction efficiency （LEE）. In this report, we investigate the influence of the tapering angle of closely packed AIGaN NWs, which is found to exist naturally in molecular beam epitaxy （MBE） grown NW structures, on the LEE of NW DUV-LEDs. It is observed that, by having a small tapering angle, the vertical extraction is greatly enhanced for both transverse magnetic （TM） and transverse elec- tric （TE） polarizations. Most notably, the vertical extraction of TM emission increased from 4.8% to 24.3%, which makes the LEE reasonably large to achieve high-performance DUV-LEDs. This is because the breaking of symmetry in the vertical direction changes the propagation of the light significantly to allow more coupling into radiation modes. Finally, we introduce errors to the NW positions to show the advantages of the tapered NW structures can be projected to random closely packed NW arrays. The results obtained in this paper can provide guidelines for designing efficient NW DUV-LEDs.

关键词： Tapering-induced enhancement light extraction efficiency of nanowire deep ultraviolet LED theoretical simulations

Editorial for special Issue on Underwater Wireless Optical Communication

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Chinese Optics Letters 2019年第10期17卷 1-1页

作者： Jing Xu boon s.ooi Gong-Ru Lin Zhejiang University King Abdullah University of science&Technology Taiwan University

Underwater wireless optical communication(UWOC)has gained increasing research interest worldwide from both academic and industrial communities,because of its high bandwidth,compact antennas,low latency,cost-effectiveness,and low power *** the underwater world,the wireless optical links can be complementary to or even more competitive than its acoustic counterpart.

关键词： wireless optical antennas

A tutorial on laser-based lighting and visible light communications:device and technology [Invited]

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Chinese Optics Letters 2019年第4期17卷 19-33页

作者： Yujian Guo Omar Alkhazragi Chun Hong Kang Chao shen Yuan Mao Xiaobin sun Tien Khee Ng boon s.ooi Photonics Laboratory King Abdullah University of Science and Technology (KAUST)

This tutorial focuses on devices and technologies that are part of laser-based visible light communication(VLC)systems. Laser-based VLC systems have advantages over their light-emitting-diode-based counterparts, including having high transmission speed and long transmission distance. We summarize terminologies related to laser-based solid-state lighting and VLC, and further review the advances in device design and *** high-speed modulation characteristics of laser diodes and superluminescent diodes and the on-chip integration of optoelectronic components in the visible color regime, such as the high-speed integrated photodetector,are introduced. The modulation technology for laser-based white light communication systems and the challenges for future development are then discussed.

关键词： tutorial focuses technologies communication systems

High-speed colour-converting photodetector with all-inorganic CsPbBr_(3) perovskite nanocrystals for ultraviolet light communication

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Light(science & Applications) 2019年第1期8卷 306-317页

作者： Chun Hong Kang Ibrahim Dursun Guangyu Liu Lutfan sinatra Xiaobin sun Meiwei Kong Jun Pan Partha Maity Ee-Ning ooi Tien Khee Ng Omar F.Mohammed Osman M.Bakr boon s.ooi Photonics Laboratory Division of ComputerElectricaland Mathematical Sciences and EngineeringKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia Division of Physical science and Engineering King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia Quantum solutions LLC Thuwal 23955-6900Kingdom of Saudi Arabia

Optical wireless communication(OWC)using the ultra-broad spectrum of the visible-to-ultraviolet(UV)wavelength region remains a vital field of research for mitigating the saturated bandwidth of radio-frequency(RF)***,the lack of an efficient UV photodetection methodology hinders the development of UV-based *** key technological impediment is related to the low UV-photon absorption in existing silicon photodetectors,which offer low-cost and mature *** address this technology gap,we report a hybrid sibased photodetection scheme by incorporating CsPbBr_(3) perovskite nanocrystals(NCs)with a high photoluminescence quantum yield(PLQY)and a fast photoluminescence(PL)decay time as a UV-to-visible colourconverting layer for high-speed solar-blind UV *** facile formation of drop-cast CsPbBr_(3) perovskite NCs leads to a high PLQY of up to ~73% and strong absorption in the UV *** the addition of the NC layer,a nearly threefold improvement in the responsivity and an increase of ~25% in the external quantum efficiency(EQE)of the solar-blind region compared to a commercial silicon-based photodetector were ***,timeresolved photoluminescence measurements demonstrated a decay time of 4.5 ns under a 372-nm UV excitation source,thus elucidating the potential of this layer as a fast colour-converting layer.A high data rate of up to 34 Mbps in solar-blind communication was achieved using the hybrid CsPbBr_(3)-silicon photodetection scheme in conjunction with a 278-nm UVC light-emitting diode(LED).These findings demonstrate the feasibility of an integrated high-speed photoreceiver design of a composition-tuneable perovskite-based phosphor and a low-cost silicon-based photodetector for UV communication.

关键词： perovskite ultraviolet inorganic