Article
Optics
Sidong Fu, Yu Yu, Xinliang Zhang
Summary: The article proposes an electrical crosstalk suppression scheme for optical segmented modulators by introducing a complementary doped region as an insulator, successfully reducing the electrical crosstalk in the modulator and achieving an improvement in crosstalk.
Article
Optics
Hassan Termos, Ali Mansour
Summary: We experimentally incubate a ground-breaking design of concurrent electro-optical semiconductor optical amplifier Mach-Zehnder interferometer mixing (SOA-MZI) based on a differential transformation methodology. The resultant of the contemporaneous electro-optical mixing exhibits exceptional passive power stability and optical conversion gain. The concurrent OFDM_128-QAM up-mixed signal achieves an absolute maximum bit rate of 80.4 Gbit/s.
Article
Computer Science, Information Systems
Hassan Termos, Ali Mansour
Summary: This study focuses on the simulation and experimental research of all-optical three-input AND gate schemes. The gate uses the nonlinearities of the semiconductor optical amplifier Mach-Zehnder Interferometer (SOA-MZI), particularly cross-phase modulation (XPM) and cross-gain modulation (XGM) resulting from the SOA-MZI differential modulation concept. The system performance is analyzed and evaluated through actual and simulated results, demonstrating that the proposed gate can operate with three signals driven by a 2 picoseconds (ps) optical pulse source (OPS).
Article
Optics
Jiacheng Liu, Gangqiang Zhou, Jiangbing Du, Weihong Shen, Linjie Zhou, Zuyuan He
Summary: In this work, a silicon mode-loop Mach-Zehnder modulator (ML-MZM) with record-high modulation efficiency is proposed and experimentally demonstrated. The use of a mode-loop structure and an L-shaped PN junction enables efficient optical signaling without a high voltage driver, opening up possibilities for CMOS-compatible driverless modulation.
PHOTONICS RESEARCH
(2022)
Article
Optics
Ruogu Song, Jialiang Sun, Jinyu Wang, Xinyu Li, Yufei Liu, Wencheng Yue, Yan Cai, Shuxiao Wang, Mingbin Yu
Summary: We propose and experimentally demonstrate a novel compact folded Michelson interferometer (FMI) modulator with high modulation efficiency and small footprint. This modulator, by folding the phase shift arms and using shorter traveling wave electrode (TWE), reduces the propagation loss of the RF signal and exhibits excellent performance including low V p -L, low optical insertion loss, high extinction ratio, and wide bandwidth.
Article
Optics
Jianghao Xing, Changzheng Sun, Bing Xiong, Jian Wang, Zhibiao Hao, Lai Wang, Yanjun Han, Hongtao Li, Yi Luo
Summary: A membrane multiple quantum well electro-optical modulator using high-k radio-frequency slot waveguides is proposed for sub-terahertz bandwidth, offering improved modulation efficiency and bandwidth, as well as reduced insertion loss.
Article
Optics
Weihong Shen, Gangqiang Zhou, Jiangbing Du, Linjie Zhou, Ke Xu, Zuyuan He
Summary: This study demonstrates a silicon integrated microring modulator (MRM) with record high-speed performances at the 2 μm waveband, providing prospects for silicon photonic integration and high-speed interconnection at this wavelength. The analysis of optical bistability in the 2 μm MRM is also presented, guiding the design and experimental investigation of similar devices.
PHOTONICS RESEARCH
(2022)
Article
Optics
Yuguang Zhang, Hongguang Zhang, Junwen Zhang, Jia Liu, Lei Wang, Daigao Chen, Nan Chi, Xi Xiao, Shaohua Yu
Summary: This article presents an ultrafast microring modulator (MRM) with improved performance through optimized PN junction doping concentration. The MRM demonstrates the transmission of a 240 Gb/s PAM-8 signal over 2 km standard single-mode fiber (SSMF). By introducing optical peaking and using a titanium nitride heater, the electro-optic bandwidth of the MRM is further extended. High bit rate modulations, such as 120 Gb/s NRZ, 220 Gb/s PAM-4, and 240 Gb/s PAM-8, are achieved using the high-performance and compact MRM. The article also investigates the bit error ratio (BER) for different received optical power and 2 km SSMF transmission.
PHOTONICS RESEARCH
(2022)
Article
Optics
Gengxin Chen, Kaixuan Chen, Ranfeng Gan, Ziliang Ruan, Zong Wang, Pucheng Huang, Chao Lu, Alan Pak Tao Lau, Daoxin Dai, Changjian Guo, Liu Liu
Summary: This study demonstrates an ultra-large bandwidth electro-optic modulator based on the thin-film lithium niobate platform, which does not compromise the driving voltage and exhibits low loss and high bandwidth. By introducing a special etching technique and a traveling-wave electrode design, excellent performance is achieved.
Article
Optics
Xingrui Huang, Yang Liu, Zezheng Li, Huan Guan, Qingquan Wei, Manqing Tan, Zhiyong Li
Summary: The study presents a Michelson interferometer modulator with integrated Bragg reflectors on a silicon-rich nitride-thin-film lithium niobate hybrid platform, achieving high-speed modulation with the highest modulation bandwidth.
Article
Optics
Hao Chen, Zexing Zhao, Ziming Zhang, Guoqing Wang, Jiatong Li, Zhenyuan Shang, Mengyu Zhang, Kai Guo, Junbo Yang, Peiguang Yan
Summary: This study demonstrates a phase modulator based on a micro-ring resonator integrated with few-layer MoS2. The effective index of the composite MoS2-SiN waveguide can be modulated by adjusting bias voltages, and the coupling condition between the micro-ring resonator and the bus waveguide can also be engineered during the charged doping process.
PHOTONICS RESEARCH
(2022)
Article
Optics
P. E. N. G. H. U. Xia, H. U. Yu, M. I. N. G. X. I. A. N. G. Yang, N. A. I. D. I. Cui, H. A. I. J. U. N. Liao, Q. I. A. N. G. Zhang, Z. H. I. L. E. I. Fu, Q. I. K. A. I. Huang, N. A. N. N. A. N. Ning, Z. H. U. J. U. N. Wei, X. I. A. O. Q. I. N. G. Jiang, J. I. A. N. Y. I. Yang
Summary: We present a single-chip silicon optical single sideband (OSSB) modulator consisting of a radio frequency (RF) branch line coupler (BLC) and a silicon dual-parallel Mach-Zehnder modulator (DP-MZM). By co-designing the BLC and DP-MZM, we achieved improved sideband suppression ratio (SSR). The modulator exhibited a modulation efficiency of 1.75 V·cm and a 3 dB electro-optical (EO) bandwidth of 48.7 GHz.
PHOTONICS RESEARCH
(2023)
Article
Optics
Hengsong Yue, Kaizhong Chen, Tao Chu
Summary: This paper presents a high-linearity dual-drive scheme using a single silicon dual-drive Mach-Zehnder modulator. The nonlinearity of the transfer function of the Mach-Zehnder interferometer is cancelled out by adjusting the bias voltages and RF amplitudes of the two driving arms. The proposed scheme achieves a record-breaking spurious-free dynamic range of 123.4 dB Hz6/7 for third-order intermodulation distortion, compared to 102.6 dB·Hz2/3 obtained using a conventional single-drive scheme. This scheme simplifies the design of modulators and promotes high-performance microwave photonic links.
Article
Chemistry, Analytical
Zihan Zhou, Meng Chao, Xinxin Su, Shuanglin Fu, Ruonan Liu, Zhihua Li, Shuhui Bo, Zhuo Chen, Zhenlin Wu, Xiuyou Han
Summary: This paper presents an SOH-integrated electro-optic modulator (EOM) and investigates its structure design, silicon waveguide fabrication, on-chip poling of organic electro-optic material, and modulation response characterization. The experimental results demonstrate that the SOH-integrated EOM has a high bandwidth, low power consumption, and can be used in microwave photonic phase shifter.
Article
Physics, Applied
Georgios Sinatkas, Thomas Christopoulos, Odysseas Tsilipakos, Emmanouil E. Kriezis
Summary: Electro-optic modulators play a crucial role in determining the transmission rate of photonic communication systems. Recent advancements in materials and fabrication techniques have brought new elements to research on optical modulation. This Perspective reviews the current state of integrated electro-optic modulators, covering a wide range of materials and platforms, and highlights important considerations for researchers in physics and engineering.
JOURNAL OF APPLIED PHYSICS
(2021)
Review
Astronomy & Astrophysics
T. Kawanishi, K. Inagaki, A. Kanno, N. Yamamoto, T. Aiba, H. Yasuda, T. Wakabayashi
Summary: This paper reviews various technologies for seamless bridges between radio and optical links, discusses the issue of spectral congestion in high frequency bands, and describes research trends of THz-wave technologies.
Article
Engineering, Electrical & Electronic
Kohei Fujiwara, Atsushi Kanno, Kouichi Tokita
Summary: A high-stability radio-over-fiber system was developed to transmit IEEE802.11ad packets, achieving high-speed millimeter-wave communication in environments like high-speed trains.
IEICE ELECTRONICS EXPRESS
(2021)
Article
Engineering, Electrical & Electronic
Toshimasa Umezawa, Yuki Yoshida, Atsushi Kanno, Atsushi Matsumoto, Kouichi Akahane, Naokatsu Yamamoto, Tetsuya Kawanishi
Summary: This study introduces a free-space optical (FSO) receiver with high optical alignment robustness using a single optical lens and a newly developed 2-D photodetector array (2D-PDA). The 6 x 6 square-shaped aligned arrangement matrix structure in the 2D-PDA provides a large active area for photodetection. In a 1.5-m FSO demonstration, the optical alignment tolerance on the receiver's lens is found to be as large as 12 mm, and the multiple-output signals from the 2D-PDA are utilized for the maximum ratio combining method in space diversity.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Yuki Yoshida, Setsuo Yoshida, Shoichiro Oda, Takeshi Hoshida, Naokatsu Yamamoto, Atsushi Kanno
Summary: Small mismatches between in-phase and quadrature tributaries in an electro-optic IQ modulator, known as IQ imbalance, can greatly impact high baud-rate and/or high modulation-order signals in coherent optical communications systems. In this study, a low-complexity IQ monitoring technique based on direct detection with phase retrieval, called SP-OMA, is proposed for in-service in-field monitoring of frequency-dependent imbalance profile without requiring dedicated pilot tones or being affected by receiver/monitor-side IQ imbalance. The feasibility of SP-OMA is demonstrated both numerically and experimentally with a 63.25-Gbaud 16QAM signal.
Article
Physics, Applied
Kouichi Akahane, Atsushi Matsumoto, Toshimasa Umezawa, Naokatsu Yamamoto, Yuki Yata, Hideyuki Sotobayashi, Makoto Naruse, Atsushi Kanno
Summary: Random signal generation in a ring resonator laser is achieved with quantum-dot semiconductor optical amplifiers, where the individual longitudinal modes act as the channels for random number generation.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Pham Tien Dat, Yuya Yamaguchi, Masayuki Motoya, Satoshi Oikawa, Junichiro Ichikawa, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
Summary: This study demonstrates the first fiber-millimeter-wave-fiber system in the 100-GHz band using a low-loss optical modulator and direct photonic down-conversion technology. The proposed system enables high-capacity, low-latency, and low-power consumption fiber-wireless transmission.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Pham Tien Dat, Toshimasa Umezawa, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
Summary: This Letter presents a high-speed and simple fiber-wireless-fiber system using a photonics-enabled receiver and optical phase modulator. The system successfully transmitted a 64-QAM OFDM signal with a record line rate of 80 Gb/s over a radio-over-fiber and wireless link. The proposed system with simple antenna sites and optical transceivers can facilitate the deployment of ultra-dense small cells in high-frequency bands in beyond-5G networks.
Article
Materials Science, Multidisciplinary
Atsushi Matsumoto, Kouichi Akahane, Toshimasa Umezawa, Shinya Nakajima, Naokatsu Yamamoto, Atsushi Kanno
Summary: 14-layer stacked quantum dots laser diodes (QD-LDs) were fabricated with varying thicknesses of embedding layers on an InP(311)B substrate, and the lowest threshold current (I-th) was demonstrated in a QD-LD with 13 nm-thick embedding layers. The factors unique to QDs grown on the InP(311)B substrate, such as wavefunction overlap and decrease in gain due to miniband formation, contribute to the variation in I-th based on embedding layer thickness.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2022)
Article
Computer Science, Hardware & Architecture
Paikun Zhu, Yuki Yoshida, Atsushi Kanno, Ken-ichi Kitayama
Summary: This paper provides a comprehensive analysis of three major DSP-enhanced RoF techniques and presents quantitative and qualitative analysis on performance, latency, power consumption, and system complexity. The challenges to and opportunities for future research are also discussed.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2022)
Article
Engineering, Electrical & Electronic
Pham Tien Dat, Yuya Yamaguchi, Atsushi Kanno
Summary: This study compares the performance of photonic downconversion technology using single and dual wavelength modulation methods. The results demonstrate the potential of the system as a promising solution for uplink mobile fronthaul in high-frequency bands.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Physics, Applied
Satoshi Yanase, Kouichi Akahane, Atsushi Matsumoto, Naokatsu Yamamoto, Atsushi Kanno, Tomohiro Maeda, Hideyuki Sotobayashi
Summary: This study investigates InAs multiple-stacked quantum dot lasers in the 1.55 μm band using the Bi surfactant effect. The Bi surfactant effect increases the quantum dot size and changes the emission wavelength, while enhancing the internal quantum efficiency of the fabricated laser.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Paikun Zhu, Yuki Yoshida, Atsushi Kanno, Ken-ichi Kitayama
Summary: High-speed intensity-modulation direct-detection (IM/DD) fiber optical transmission system is important for datacenter interconnects (DCI) and edge/access networks. Chromatic dispersion (CD) induced power fading is a severe issue for long-distance transmissions, but an ultra-low complexity joint optical-electrical feedforward equalization (OE-FFE) scheme can mitigate the distortion. Experimental results show the potential of OE-FFE approach for CD-constrained beyond-100G/lambda ER and beyond-50G/lambda ZR IM/DD systems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Ukrit Mankong, Pakawat Chamsuk, Sitthichok Nakprasert, Sangdaun Potha, Zu-Kai Weng, Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
Summary: This article presents the first experimental study of the combined rain and wind effects on a millimeter wave fixed wireless system in a tropical location. The results show that the current ITU-R model can estimate rain attenuation, and the addition of wind attenuation via the APT model can estimate the worst-case link budget during high wind speeds.
Proceedings Paper
Engineering, Electrical & Electronic
Toshimasa Umezawa, Atsushi Matsumoto, Kouichi Akahane, Atsushi Kanno, Naokatsu Yamamoto
Summary: We have fabricated a high-speed photodetector with 400 pixels and a large square size of 0.85mm, which maintains high frequency performance. The high frequency characteristics and optical alignment robustness have been demonstrated in a 20m long distance FSO communication.
2022 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Asif Bilal, Abdul Quddious, Haris Votsi, Atsushi Kanno, Tetsuya Kawanishi, Stavros Iezekiel, Marco A. Antoniades
Summary: An optically-controlled reconfigurable NRI-TL metamaterial phase shifter operating at 3.6 GHz is proposed in this study, demonstrating a phase shift of +/- 60 degrees and a differential phase shift of 120 degrees with insertion losses of 1.3 dB and 1.8 dB. The phase shifter is designed for 5G antenna array applications due to its versatile optical control and high-frequency response capabilities.
2021 15TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2021)
