Article
Engineering, Electrical & Electronic
Ronis Maximidis, Christos Vagionas, George Kalfas, Yigal Leiba, Amalia Miliou, Nikos Pleros
Summary: The growing demand for ubiquitous broadband connectivity in 5G/6G Radio Access Networks (RANs) has led to the popularity of Centralized RAN (C-RAN) and reconfigurable Point-to-MultiPoint (PtMP) network topologies. By utilizing an all-passive Arrayed Waveguide Grating Router (AWGR), this study proposes and demonstrates the reconfigurable allocation of multiple parallel Fiber-Wireless (FiWi) millimeter wave (mmWave) analog interfaces. Experimental measurements validate the proposed concept, achieving high data rates and meeting the 5G Key Performance Indicator (KPI) requirements for EVM quality and peak data traffic.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Zhe Jiang, Hazem Beshara, Jerry Lam, Naim Ben-Hamida, Calvin Plett
Summary: This paper presents a high data rate wireline Discrete Multitone (DMT) transceiver capable of operating at 252 Gbps and higher. It achieves higher spectral efficiency than PAM SERDES systems, and improves data rates over other wireline DMT designs. The system has been measured with a loss of 18 dB at 50 GHz, showing data rates of 252 Gb/s with a BER of 10(-6), and 400 Gb/s with a BER of 10(-2).
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2023)
Article
Engineering, Electrical & Electronic
Rohit B. Patel, Dilip Kumar Kothari
Summary: The research demonstrates that WDM optical systems with ULAF fiber outperform those with SSMF and LEAF fibers, especially in terms of Q-factor and EVM values. ULAF shows significant advantages in improving transmission distance and reducing error rates.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Wenpeng Gao, Yuyuan Gao, Dongxu Lu, Ming Luo, Haibo Li, Jiahao Huo, Xian Zhou
Summary: This paper investigates the transmission of probabilistic shaped polarization-division-multiplexed eight-level pulse amplitude modulated (PS-PDM-PAM-8) signal over multi-core fiber (MCF) using coherent detection. A modified signal phase-based LMS (SP-LMS) algorithm is proposed to equalize both intensity-modulated and filed modulated PS PAM signals. By employing PS and MCF transmission, a total rate of 448 Gb/s is achieved and compared with traditional PDM-PAM4 signal, a 22.4 Gb/s gain in net bit rate can be achieved.
OPTICAL FIBER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Jose M. Castro, Rick Pimpinella, Bulent Kose, Paul Huang, Asher Novick, Brett Lane
Summary: This study introduces a theoretical model and experiments focusing on estimating and measuring MCDI over multimode optical channels using VCSEL transceivers, evaluating the impact on PAM-4 signals and bit error rate performance at data rates between 100 and 112 Gbps. The analysis highlights potential methods to improve the reach of multimode fiber channels.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Dong-Nhat Nguyen, Luis Vallejo, Vincenc Almenar, Beatriz Ortega, Pham Tien Dat, Son Thai Le, Jan Bohata, Stanislav Zvanovec
Summary: In this paper, a stable full-duplex transmission of millimeter-wave signals over a hybrid SMF and FSO link is proposed for the acceleration of Industry 4.0 transformation in 5G radio access networks. Experimental results show successful transmission of 3 Gb/s SCM signals and 2.4 Gb/s 5G NR signals over the hybrid system, satisfying the requirements of 3GPP. Based on data from Spain, the estimated wireless radio distance for both DL and UL direction under heavy rain condition is approximately 200 m.
Article
Optics
Yang Hong, Natsupa Taengnoi, Kyle R. H. Bottrill, Naresh K. Thipparapu, Yu Wang, Jayanta K. Sahu, David J. Richardson, Periklis Petropoulos
Summary: This study reports the longest 50-Gb/s/lambda O-band wavelength-division multiplexed transmission system to date. By using in-house built bismuth-doped fiber amplifiers and Kramers-Kronig detection-assisted single-sideband transmission, the challenges of fiber loss and chromatic dispersion are overcome. The experimental results demonstrate that a transmission distance of up to 100 km can be achieved on all 50-Gb/s channels without the need for in-line optical amplification.
Article
Engineering, Electrical & Electronic
Yunsi Ma, Nan Wu, J. Andrew Zhang, Bin Li, Lajos Hanzo
Summary: This paper proposes a low-complexity generalized approximate message passing (GAMP)-based frequency-domain equalization (FDE) algorithm for MFTN systems operating in multipath channels. By constructing block circulant interference matrices and utilizing the two-dimensional fast Fourier transform, the ill-condition of the equivalent channel matrix can be mitigated. Joint optimization of time- and frequency-domain packing factors can significantly improve the performance of MFTN signaling.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Hongqi Zhang, Lu Zhang, Shiwei Wang, Zijie Lu, Zuomin Yang, Siqi Liu, Mengyao Qiao, Yuqian He, Xiaodan Pang, Xianmin Zhang, Xianbin Yu
Summary: This research demonstrates a Tbit/s THz-over-Fiber wireless communication system achieving a net data rate exceeding 1059 Gbit/s, making a significant contribution to the development of 6G wireless communication.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Hideki Maeda, Kohei Saito, Hiroki Kawahara, Takeshi Seki, Takeo Sasai, Fukutaro Hamaoka
Summary: This study demonstrated high spectral efficiency real-time 500-Gb/s/carrier transmission over a 1200 km length with field-installed cut-off shifted fiber (CSF) complying with ITU-T G.654.E standards, achieving a spectral efficiency of 5.71 b/s/Hz. Using a combination of amplification schemes and advanced digital signal processing technology, the transmission characteristics were compared with standard single-mode fiber (SMF) and dispersion-shifted fiber (DSF), showing that CSF with forward DRA had the best performance.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
M. V. Ramana Murty, Jingyi Wang, Ann Lehman Harren, An-Nien Cheng, David W. Dolfi, Zheng-Wen Feng, Aaditya Sridhara, Sumitro Taslim Joyo, Jason Chu, Laura M. Giovane
Summary: This article discusses the development of multi-mode VCSELs with improved bandwidth and noise performance for 100 Gb/s data communication links over multi-mode fiber. The VCSELs are designed to maximize transmission distance at the peak multi-mode fiber bandwidth of 850 nm. Experimental results demonstrate successful transmission of PAM-4 signals using equalization techniques.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Jing Zhang, Qun Liu, Mingyue Zhu, Taowei Jin, Jiahao Zhou, Hong Lin, Shaohua Hu, Xingwen Yi, Kun Qiu
Summary: Band-limited and power fading effects are main limitations to intensity-modulation direct-detection (IM-DD) transmission systems, but entropy loading (EL) can optimize performance by continuously adjusting entropy. However, practical binary forward error correction (FEC) codes may limit the effectiveness of normalized generalized mutual information (NGMI) targeting. An experiment on high-speed signal transmission over single mode fiber using electro-absorption modulated laser (EML) revealed a need for joint EL and second-order Volterra filter to maximize transmission capacity.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Christina Lim, Ampalavanapillai Nirmalathas
Summary: Radio-over-fiber (RoF) technology, introduced to the telecommunication arena in the eighties, has evolved from initial focus on backhaul transport to current focus on mobile fronthaul over the last three decades. This paper provides an overview of present research areas in RoF and discusses the benefits of centralized control configuration of RoF based fronthaul. The challenges and future outlook of this research field are also discussed.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Computer Science, Information Systems
Takumi Ishihara, Shinya Sugiura, Lajos Hanzo
Summary: FTN signaling utilizes non-orthogonal dense symbol packing in the time domain to increase data rate, with low complexity detection and channel estimation techniques. Recent introduction of frequency-domain filtering and precoding aided schemes relate information rate to eigenvalues, simplifying power allocation design for increasing the data rate attained.
Article
Chemistry, Analytical
Mohamed Dawa, Marijan Herceg, Georges Kaddoum
Summary: This paper presents a new multi-user chaos-based communication system that uses Faster-than-Nyquist sampling to achieve higher data rates and lower energy consumption. The system, called Multi-user Faster Than Nyquist Differential Chaos Shift Keying (MU-FTN-DCSK), combines the traditional structure of Differential Chaos Shift Keying (DCSK) communication systems with a filtering system that goes below the Nyquist limit for data sampling. The system is designed to enable simultaneous transmissions from multiple users through multiple sampling rates, resulting in semi-orthogonal transmissions.