Article
Engineering, Electrical & Electronic
Yun-Han Chang, Yu-Ming Huang, Wahyu Hendra Gunawan, Guan-Hao Chang, Fang-Jyun Liou, Chi-Wai Chow, Hao-Chung Kuo, Yang Liu, Chien-Hung Yeh
Summary: This study demonstrates a record 4.343 Gbit/s green color micro-LED based visible-light communication technology. By growing the micro-LED on a semipolar orientation, a higher modulation bandwidth was achieved at a lower current density, leading to improved communication efficiency.
IEEE PHOTONICS JOURNAL
(2021)
Article
Computer Science, Information Systems
Mohammad Javad Zakavi, S. Alireza Nezamalhosseini, Lawrence R. Chen
Summary: This paper proposes a multiuser visible light communication (VLC) system using massive multiple-input multiple-output (mMIMO) orthogonal frequency-division multiplexing (OFDM) for achieving high data rates. By utilizing an array of LEDs to illuminate a room, user interference can be eliminated with simple linear signal processing, allowing more users to communicate simultaneously. The performance of three linear precoding methods in terms of spectral efficiency and downlink optical power is evaluated and compared.
Article
Optics
Ganesh Miriyala, V. V. Mani
Summary: This paper proposes a new modulation technique, LADO-OFDM, for VLC systems to mitigate mutual interference between signals, reduce computing complexity and latency. Simulation results show that the proposed scheme outperforms traditional ADO-OFDM in terms of BER performance.
Article
Optics
Jummah Abdulwali, Said Boussakta
Summary: The introduction of the C-transform in the system architecture effectively spreads information and reduces peak-to-average power ratio, resulting in superior performance.
Article
Engineering, Electrical & Electronic
Tilahun Zerihun Gutema, Harald Haas, Wasiu O. Popoola
Summary: This work investigates probabilistic shaping (PS) for optical wireless communications and its application to wavelength division multiplexing (WDM) based visible light communication (VLC). The performance of the proposed scheme is validated through experimental demonstration. The experimental setup employs lenses to collimate the light beam and optimizes system parameters of the WDM based VLC system, measures channel response, and allocates PS-based symbols to individual orthogonal frequency division multiplexing (OFDM) subcarriers. Under the considered channel conditions, PS achieves a near Shannon capacity transmission rate of 10.81 Gb/s, which is 25% higher than the widely used adaptive bit-power loading algorithm under the same channel conditions.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Wahyu Hendra Gunawan, Chi-Wai Chow, Yang Liu, Yun-Han Chang, Chien-Hung Yeh
Summary: This work presents a high-capacity visible light communication system that utilizes five dimensions in physics and achieves significant improvements in spectral efficiency and bandwidth utilization. The system is based on orthogonal frequency division multiplexing and non-orthogonal multiple access signals.
Article
Optics
Huandong Hong, Zhengquan Li
Summary: The proposed hybrid adaptive bias optical OFDM (HABO-OFDM) scheme for visible light communication (VLC) aims to improve spectral efficiency and power efficiency by combining different optical OFDM components for transmission at the same time and ensuring non-negativity with adaptive bias. The simulation results show that HABO-OFDM outperforms conventional schemes in terms of peak-to-average-power ratio (PAPR) and power efficiency, offering about 3.2 dB lower PAPR performance than HACO-OFDM and 1.7 dB lower than ABO-OFDM.
Article
Computer Science, Information Systems
Mulundumina Shimaponda-Nawa, Oluwafemi Kolade, Ling Cheng
Summary: This study focuses on the study of impulse noise in PLC channels and proposes a PC OEDM-MFSK scheme to reduce the impact of noise on system performance. Through experiments, the effectiveness of this scheme is confirmed, and a generalized PC OEDM-MFSK scheme is proposed to improve the degraded data rate. The use of OEDM-MFSK improves system performance, and further gains in performance and reduction in decoding complexity are achieved using a soft-decision HM decoder.
Article
Optics
Wahyu-Hendra Gunawan, Yang Liu, Chi-Wai Chow, Yun-Han Chang, Chien-Hung Yeh
Summary: A visible-light communication system based on red LD is proposed, achieving a total data rate of 8.07 Gbit/s using OFDM and PowDM multiplexing schemes. Experimental verification is conducted to evaluate the system performance, with discussions on modulation and demodulation of OFDM and PowDM, as well as analysis of optimum power levels in the PowDM signal.
Article
Computer Science, Information Systems
Shuqiang Niu, Ping Wang, Sihui Chi, Zhongyu Liu, Weina Pang, Lixin Guo
Summary: An enhanced OFDM/OQAM scheme for visible light communication, inspired by the PHO-OFDM scheme, is proposed in this letter. Half of the subcarriers carry useful data while the rest carry negative clipping noise, improving power efficiency. Simulation results show better BER performance compared to PHO-OFDM without additional interference operations.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Zahraa Mustafa Zaidan, Oguz Bayat, Ayad Atiyah Abdulkafi
Summary: This paper proposes a new DC-PAM-OFDM method to improve the spectral efficiency of visible light communication (VLC) systems. Compared to traditional methods, this method does not use Hermitian symmetry and can achieve a 100% increase in spectral efficiency. It is also more energy efficient compared to PAM-DMT and has better bit error rate performance and lower peak-to-average power ratio under the same spectral efficiency conditions.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Optics
Zuxin Jin, Lintao Van, Shijie Zhu, Xugao Cui, Pengfei Tian
Summary: In this paper, a 3x3 violet series-biased micro-LED array with high-output optical power was fabricated and applied in high-speed and long-distance visible light communication. By utilizing orthogonal frequency division multiplexing modulation scheme, distance adaptive pre-equalization, and a bit-loading algorithm, data rates of 10.23 Gbps, 10.10 Gbps, and 9.51 Gbps were achieved at distances of 0.2 m, 1 m, and 10 m respectively, below the forward error correction limit of 3.8x10-3. These are the highest data rates achieved by violet micro-LEDs in free space and the first communication demonstration beyond 9.5 Gbps at 10 m using micro-LEDs.
Article
Optics
Lijuan Tang, Yinmei Wu, Zerui Cheng, Dongdong Teng, Lilin Liu
Summary: In this paper, integrated transmitter modules with 9 V high-voltage LED chips and built-in hardware pre-equalization circuits are designed and fabricated for WDM VLC system. The measured -3 dB electrical modulation bandwidths are obtained for purple, blue, green, and red channels, resulting in an aggregate bandwidth of about 3.37 GHz. The experiment shows that the maximum aggregate data rate for the offline VLC system exceeds 23.43 Gb/s and all wavelength channels have BERs below the pre-FEC limit of 7%.
OPTICS COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Juan Sebastian Betancourt Perlaza, Randy Lozada Dominguez, Enrique San Millan Heredia
Summary: This paper presents a programmable software implementation of an OFDM system using a novel phase correction technique for VLC channels. It identifies and estimates the deterministic noise specific to VLC systems, subtracts it from all subcarriers before measuring the phase shift induced by the differences between transmitter and receiver clocks.
IEEE PHOTONICS JOURNAL
(2023)
Article
Optics
Yungui Nie, Jiamin Chen, Wanli Wen, Min Liu, Xiong Deng, Chen Chen
Summary: In this paper, an OSDMA scheme for MU-VLC systems is proposed and experimentally demonstrated. By employing DFT-S and interleaving, the low-pass frequency response and LED nonlinearity issues of practical systems are overcome. The feasibility and superiority of the proposed scheme are successfully verified via simulations and hardware experiments.
Correction
Optics
Christopher L. Panuski, Ian Christen, Momchil Minkov, Cole J. Brabec, Sivan Trajtenberg-Mills, Alexander D. Griffiths, Jonathan J. D. McKendry, Gerald L. Leake, Daniel J. Coleman, Cung Tran, Jeffrey St Louis, John Mucci, Cameron Horvath, Jocelyn N. Westwood-Bachman, Stefan F. Preble, Martin D. Dawson, Michael J. Strain, Michael L. Fanto, Dirk R. Englund
Article
Biochemical Research Methods
Natalie Bruce, Francesca Farrell, Enyuan Xie, Mark G. Scullion, Anne-Marie Haughey, Erdan Gu, Martin D. Dawson, Nicolas Laurand
Summary: A fluorescence sensor capable of spatially multiplexed measurements using smartphone detection is introduced. Bioconjugated quantum dots are employed as the fluorescent label and excited by a blue-emitting microLED. The one-dimensional GaN microLED array is butt-coupled to one edge of a glass slide to utilize total internal reflection fluorescence (TIRF) principles. Bioassays on the glass waveguide's top surface are excited, and the resulting fluorescence is detected using a smartphone. The red, green, and blue channels of the digital image are used to spectrally separate the excitation light from the fluorescence for analysis. Proof-of-principle experiments using a biotin-functionalized glass slide demonstrate the detection of streptavidin conjugated quantum dots down to a concentration of 8 nM.
BIOMEDICAL OPTICS EXPRESS
(2023)
Article
Optics
Graeme E. Johnstone, Johannes Herrnsdorf, Martin D. Dawson, Michael J. Strain
Summary: Challenging imaging applications that require ultra-short exposure times or imaging in photon-starved environments often have extremely low numbers of photons per pixel (<1 photon per pixel). To improve the image quality in such photon-sparse images, post-processing techniques, such as Bayesian retrodiction and bilateral filtering, can be used to estimate the number of photons detected and improve the spatial distributions in single-photon imaging applications. In this study, we demonstrate that at high frame rates (>1 MHz) and low incident photon flux (<1 photon per pixel), image post-processing techniques can provide better grayscale information and spatial fidelity of reconstructed images compared to simple frame averaging, with up to a 3-fold improvement in SSIM.
Article
Engineering, Electrical & Electronic
Mohammad Dehghani Soltani, Hossein Kazemi, Elham Sarbazi, Taisir E. H. El-Gorashi, Jaafar M. H. Elmirghani, Richard V. Penty, Ian H. White, Harald Haas, Majid Safari
Summary: In this paper, we propose a design of a compact high-speed and wide field of view (FOV) imaging receiver using an array of photodetectors and focusing lenses. By controlling the trade-offs between area-bandwidth and gain-FOV, we optimize the data rate achievable while maintaining a desired FOV.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Eleni Margariti, Gemma Quinn, Dimitars Jevtics, Benoit Guilhabert, Martin D. Dawson, Michael J. Strain
Summary: A continuous, single shot roller transfer printing process is introduced for large-scale hybrid integration of semiconductor devices. It demonstrates transfer of a 320 x 240 pixel micro-LED array, with sub-micron relative position accuracy, representing over 75,000 individual devices in one shot. The transfer printing process maintains array geometry, with pixel spatial location error less than 1 & mu;m deviation from the as-designed layout. An automated sub-micron precision metrology system using simple optical microscopy is developed to assess device populations and yield.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Computer Science, Information Systems
Cheng-Xiang Wang, Xiaohu You, Xiqi Gao, Xiuming Zhu, Zixin Li, Chuan Zhang, Haiming Wang, Yongming Huang, Yunfei Chen, Harald Haas, John S. Thompson, Erik G. Larsson, Marco Di Renzo, Wen Tong, Peiying Zhu, Xuemin Shen, H. Vincent Poor, Lajos Hanzo
Summary: 5G has been commercially deployed, providing new services and improved user experiences to users, and offering novel opportunities to various industries. However, it still faces challenges, leading to research on 6G wireless communication systems by international organizations. This paper comprehensively presents the vision, technical requirements, and application scenarios of 6G, critically evaluates its network architecture and key technologies, introduces existing testbeds and advanced verification platforms, and identifies future research directions and open challenges.
IEEE COMMUNICATIONS SURVEYS AND TUTORIALS
(2023)
Article
Engineering, Electrical & Electronic
Tilahun Zerihun Gutema, Harald Haas, Wasiu O. Popoola
Summary: This work presents an analysis of symbol error performance in wireless communications using probabilistic shaping (PS) in both noise-limited and fading channels, specifically Rayleigh and log-normal fading channels. The results are validated through simulations and compared to uniformly distributed input symbols. The study shows that PS significantly reduces the required signal-to-noise ratio (SNR) compared to uniformly shaped symbols, across all channel conditions. For example, in a noise-limited channel, PS-based quadrature amplitude modulation (QAM) signals achieve SNR gains of 1.16 dB, 1.41 dB, and 1.52 dB compared to uniformly distributed QAM symbols at entropy rates of 4, 6, and 8 bit/symbol with a symbol error ratio (SER) of 1 x 10(-3).
IEEE OPEN JOURNAL OF THE COMMUNICATIONS SOCIETY
(2023)
Article
Engineering, Electrical & Electronic
Benoit Guilhabert, Sean P. Bommer, Nils K. Wessling, Dimitars Jevtics, Jack A. Smith, Zhongyi Xia, Saptarsi Ghosh, Menno Kappers, Ian M. Watson, Rachel A. Oliver, Martin D. Dawson, Michael J. Strain
Summary: Transfer printing technology has been widely used for integrating planar membrane devices on photonic and electronic circuits. This work introduces an advanced transfer print system that allows printing of optical devices in non-planar geometries and enables in-situ optical monitoring. The system demonstrates the printing of micro-resonators coupled to on-chip waveguides, inverted device printing, and the assembly of micro-cavities with semiconductor micro-lenses and nanowire lasers. Non-standard substrates such as optical chip facets and single-mode fibre ends are also successfully printed. The in-situ optical coupling through the transfer printing system enables real-time active alignment of the printed devices.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Jonathan J. D. McKendry, Enyuan Xie, Jordan Hill, Hichem Zimi, Johannes Herrnsdorf, Erdan Gu, Robert K. Henderson, Martin D. Dawson
Summary: This article reports a deep ultraviolet AlGaN micro-LED array driven by electronic drivers implemented in CMOS technology. The integrated device allows independent control of each micro-LED and has potential applications in various fields.
IEEE PHOTONICS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Jordan Hill, Cheng Chen, Enyuan Xie, Jonathan J. D. Mckendry, Johannes Herrnsdorf, Erdan Gu, Harald Haas, Martin D. Dawson
Summary: We systematically investigate the performance of UV-C LEDs for optical wireless communication, focusing on the device size dependence. Smaller devices exhibit lower optical power but faster modulation speed. The study finds that a 60 μm diameter LED transmitter achieves the highest average SNR and SE, with a data transmission rate of up to 5.53 Gbps.
IEEE PHOTONICS JOURNAL
(2023)
Proceedings Paper
Nanoscience & Nanotechnology
Jack A. Smith, Zhibo Li, Saprtarsi Ghosh, Henry Francis, Gabriele Navickaite, Loyd J. McKnight, Rachel A. Oliver, Martin D. Dawson, Michael J. Strain
Summary: Silicon nitride (Si3N4) is a high-performance material platform for visible wavelength photonic integrated circuits, especially for heterogeneous/hybrid integration of complementary materials. This work characterizes the performance of Si3N4 from LIGENTEC as a base for hybrid integration.
2023 IEEE PHOTONICS SOCIETY SUMMER TOPICALS MEETING SERIES, SUM
(2023)
