Article
Chemistry, Multidisciplinary
Xinxin Gao, Ze Gu, Qian Ma, Wen Yi Cui, Tie Jun Cui, Chi Hou Chan
Summary: Driven by the demands for compact interconnects and fast information transfer, research on spoof plasmonic metamaterials has been focused on achieving individual modulation of amplitude or phase at single frequencies due to structural limitations. This study proposes and experimentally demonstrates an ultra-thin reprogrammable modulator consisting of a spoof surface plasmonic polariton (SSPP) waveguide and spoof localized surface plasmon (SLSP) resonators, allowing independent control of amplitude and phase of surface waves. By manipulating the SSPP waveguide and SLSP resonators in real-time, various programmable modulations such as amplitude-shift keying, phase-shift keying, quadrature amplitude modulation, and frequency-shift keying can be achieved. Measurement results confirm the potential applications of the reprogrammable plasmonic metamaterial in integrated circuits and communication systems.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Qiankun Li, Xiongwei Yang, Huashun Wen, Qi Xu, Jiali Yang, Huajun Yang
Summary: An all-optical format conversion scheme for star-octal quadrature amplitude modulation signals is proposed and numerically simulated based on nonlinear effects in the high nonlinear fiber. The input star-8QAM signal is de-aggregated into one QPSK signal and one OOK signal, then aggregated back into a star-8QAM signal. The amplitude ratio of the aggregated signal can be adjusted flexibly by changing the power of the QPSK and OOK signals.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Sha Zhu, Zhijie Chen, Yunxin Wang, Ya Jin, Kunpeng Zhai, Yunping Bai, Jun Tan, Peiyuan Wan, Xu Liu, Wei Li, Ning Hua Zhu
Summary: This paper proposes and demonstrates a photonic multi-format background-free binarily modulated microwave signal generator using a single dual-polarization dual-parallel Mach-Zehnder modulator. The generator features good reconfiguration and switchability, capable of generating microwave signals with multiple modulation methods.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Qiankun Li, Xiongwei Yang, Qi Xu, Jiali Yang, Yameng Li, Huajun Yang
Summary: An all-optical aggregation and de-aggregation scheme is proposed and simulated based on nonlinear effects in high nonlinear fiber, allowing conversion between OOK, QPSK, and 8QAM signals. In the de-aggregation process, the 30 Gbit/s 8QAM signal is converted into a 20 Gbit/s QPSK signal and a 10 Gbit/s BPSK signal using SPM, XPM, FWM, and PA effects. The converted OOK signal is obtained through vector superposition, while in the aggregation process, the QPSK and OOK signals are aggregated into a 30 Gbit/s 8QAM signal again using XPM and PA effects. The proposed scheme is important for network traffic aggregation and de-aggregation with different modulation formats.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Inho Ha, Joungmoon Lee, Jinwoo Park, Sang-Kook Han
Summary: This study proposes a novel multi-dimensional optical transmission system based on a direct detection system, which utilizes modulation techniques based on optical intensity, polarization, and phase to achieve optical multi-dimensional transmission. The performance and interference of each dimension modulation were analyzed through numerical and experimental analysis. The system's performance was verified using BER, eye diagram, and spectrum analysis.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Xu Hua Cao, Xiao Jie Fan, Ming Li, Ning Hua Zhu, Wei Li
Summary: In this study, we propose a novel photonic approach to generate reconfigurable multi-frequency multiple binary modulation formats microwave signals using a dual-polarization dual-drive Mach-Zehnder modulator. By setting the proper formats of coding signals, various modulation formats of microwave signals can be generated successfully without changing the system structure.
OPTICS COMMUNICATIONS
(2024)
Article
Multidisciplinary Sciences
Changchen Chen, Jane E. Heyes, Jeffrey H. Shapiro, Franco N. C. Wong
Summary: The research team successfully demonstrated a 15.65 GHz frequency shift for classical and nonclassical light using a commercially available quadrature phase-shift keying modulator, with a high carrier-to-sideband ratio of 30 dB. Utilizing the frequency shifter, they showed the improvement of visibility from 62.7% to 89.1% in Hong-Ou-Mandel quantum interference between two photons whose initial frequency spectra overlap only partially.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Electrical & Electronic
Mohammad Oveisi, Huan Wang, Payam Heydari
Summary: Realizing high-order modulation schemes directly in the RF domain, called RF-QAM, enables the generation of spectrally efficient 4(M)QAM symbols using the vectorial summation of scaled QPSK signals. This approach eliminates the need for power-hungry DAC and mitigates stringent linearity requirement of the front-end PA. A comprehensive comparative study of RF-QAM and conventional transmitters is presented, investigating design issues and performance. Circuit and system-level simulations confirm the superior performance of the RF-QAM transmitter.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2023)
Article
Chemistry, Multidisciplinary
Yishi Han, Changsheng Zeng, Yongming Zhong, Zhongguo Guo, Guanfeng Guo, Zhongkun Li, Hongyi Ren, Shaowu Xie, Hongxia Liang, Gengxin Zheng
Summary: This photonic scheme utilizes a dual-polarization dual-parallel Mach-Zehnder modulator (DP-DPMZM) to generate ternary modulated signals with multiple wavebands and a large frequency range.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Electrical & Electronic
Guo-Wei Lu, Hong-Bo Zhang, Zhe Li
Summary: This study presents a scheme for synthesizing single-sideband (SSB) Nyquist high-order QAM using optical subcarrier processing (OSP), which is experimentally validated to be effective. The scheme reduces the requirement for DAC resolution, hence decreasing power consumption and cost, by coherently merging sidebands in the twin-SSB through data aggregation. Additionally, the use of a low-cost laser as the pump source in data aggregation avoids phase noise introduction, contributing to further cost reduction and improved performance.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Computer Science, Information Systems
Wei-Lun Lin, Fan-Shuo Tseng
Summary: Active constellation extension (ACE) was developed to reduce PAPR in OFDM systems and optimize 2-D constellation signals. Despite the lack of a rigorous theoretical framework in literature, this study proposes a formal mathematical framework for ACE and demonstrates its roles in reducing PAPR and improving error performance and throughput under varying channel conditions.
Article
Engineering, Electrical & Electronic
Garima Shukla, Sajal K. Paul
Summary: This work presents the realization of an electronically tunable third-order quadrature oscillator (TOQO) that provides multiple output signals with controllable amplitudes. The proposed circuit also serves as an arbitrary phase shift generator and generates amplitude modulation signals without affecting the condition and frequency of oscillation. It exhibits low phase error, low THD, low phase noise, low sensitivity, and low power consumption, while also showing robustness against component tolerances and PVT variations.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Nanoscience & Nanotechnology
Cai-Syuan Fu, Chih-Hsien Cheng, Cheng-Hsuan Hsieh, Huai-Yung Wang, Cheng-Ting Tsai, Yu-Chieh Chi, Gong-Ru Lin
Summary: Demonstration of all-optical phase-shift-keying (PSK) data conversion beyond 10 Gbit/s using a carbon-doped silicon carbide (SiC:C) waveguide microring resonator with the nonlinear Kerr effect switching. The nonlinear Kerr switching leads to enhanced signal-to-noise ratio (SNR) of the converted amplitude-shift keying (ASK) data. The conversion between ASK and PSK modulation formats is achieved through nonlinear phase variation in the SiC:C microring. By combining microring-based delay-line interference, demodulated PSK data achieves received SNR, extinction ratio, and bit-error ratio.
Article
Engineering, Electrical & Electronic
Kyo Inoue
Summary: This paper analyzes the impact of inter-channel crosstalk on QPSK and QAM signals in multichannel optical systems, finding that as the number of channels increases, the BER degradation caused by crosstalk light approaches that caused by Gaussian noise light, and the degradations caused by crosstalk light and Gaussian light are similar for high-level modulation QAM signals.
IEICE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Yiming Xiao, Wenzhen Lu, Qinmengying Yan, Haijian Zhang
Summary: This paper proposes an iterative three-stage blind source separation algorithm to address the separation of multipath fading signals with impulsive interference and Gaussian noise. The algorithm involves initial estimation of mixing matrix, subspace-based TF-BSS algorithm for source separation, and least-squares algorithm for optimization of mixing matrix based on reconstructed sources. Numerical results on various signal-to-noise ratio conditions demonstrate the feasibility and effectiveness of the proposed ITS-BSS algorithm.
Article
Computer Science, Artificial Intelligence
Abdulkerim Oztekin, Ergun Ercelebi
NEURAL COMPUTING & APPLICATIONS
(2019)
Article
Engineering, Aerospace
Ahmed Alkamachi, Ergun Ercelebi
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING
(2019)
Article
Engineering, Electrical & Electronic
Mehmet Demir, Ergun Ercelebi
IET RADAR SONAR AND NAVIGATION
(2018)
Article
Computer Science, Software Engineering
Ahmed K. Ali, Ergun Ercelebi
SCIENTIFIC PROGRAMMING
(2019)
Article
Mathematical & Computational Biology
Sudad J. Ashaj, Ergun Ercelebi
JOURNAL OF MEDICAL IMAGING AND HEALTH INFORMATICS
(2020)
Article
Engineering, Biomedical
Omer Faruk Ertugrul, Emrullah Acar, Erdogan Aldemir, Abdulkerim Oztekin
Summary: An artificial intelligence-based automatic diagnosis system utilizing texture features of two-dimensional images from multi-channel ECG signals has been proposed to detect cardiovascular defects. Experimental results have confirmed that this approach reduces the computational load of the processing system without sacrificing accuracy.
BIOMEDICAL SIGNAL PROCESSING AND CONTROL
(2021)
Article
Agriculture, Multidisciplinary
Emrullah Acar, Omer Faruk Ertugrul, Erdogan Aldemir, Abdulkerim Oztekin
Summary: Developing an automatic identification system for plant diseases caused by pathogens is crucial for effective agricultural production. This study tackles disease identification by analyzing the differences in morphological characteristics of image texture features. The proposed distributed structure-based classification system achieves satisfactory accuracy rates in classifying diseases based on the examined image features.
JOURNAL OF PLANT DISEASES AND PROTECTION
(2022)
Article
Computer Science, Information Systems
Abdulkerim Oztekin, Omer Faruk Ertugrul, Erdogan Aldemir, Emrullah Acar
Summary: This study utilizes sensors embedded in wearable technologies and smartphones to analyze human motion and achieve recognition using wavelet subband features and a Randomized Neural Network (RNN) classifier. The results demonstrate a high potential for accuracy and applicability in human activity recognition and health monitoring systems.
MULTIMEDIA TOOLS AND APPLICATIONS
(2022)
Proceedings Paper
Engineering, Aerospace
Mehmet Demir, Ergun Ercelebi
2019 9TH INTERNATIONAL CONFERENCE ON RECENT ADVANCES IN SPACE TECHNOLOGIES (RAST)
(2019)
Proceedings Paper
Computer Science, Interdisciplinary Applications
Salwan N. Mahmood, Ergun Ercelecbi
2018 INTERNATIONAL CONFERENCE ON ENGINEERING TECHNOLOGY AND THEIR APPLICATIONS (IICETA)
(2018)
Proceedings Paper
Engineering, Electrical & Electronic
Yasir Al-Adhami, Ergun Ercelebi
2018 THIRD SCIENTIFIC CONFERENCE OF ELECTRICAL ENGINEERING (SCEE)
(2018)
Proceedings Paper
Computer Science, Interdisciplinary Applications
Seydi Kacmaz, Ergun Ercelebi
2018 2ND INTERNATIONAL SYMPOSIUM ON MULTIDISCIPLINARY STUDIES AND INNOVATIVE TECHNOLOGIES (ISMSIT)
(2018)