Article
Engineering, Electrical & Electronic
Daiki Soma, Shohei Beppu, Yuta Wakayama, Seiya Sumita, Hidenori Takahashi, Noboru Yoshikane, Itsuro Morita, Takehiro Tsuritani, Masatoshi Suzuki
Summary: The transmission capacity of optical submarine cable systems needs to be continuously increased, with research suggesting that single-band transmission systems with more fiber pairs could be a promising technology. Utilizing space-division multiplexing technologies such as multi-core fibers may offer solutions for further increasing transmission capacity.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Xu Zhang, Ming Luo, Jia Liu, Daigao Chen, Qingyu He, Honglin Ji, Yan Wu, Ping Du, Liang Mei, Yaqin Wang, Hongguang Zhang, Lei Wang, Zhixue He, Xi Xiao, Shaohua Yu
Summary: In this study, we experimentally demonstrate a high-throughput transmission using ultra-wideband wavelength division multiplexing in standard single-mode fiber. By using a 50-GHz grid and 396 channels to transmit different modulated signals, and employing a silicon photonic integrated transceiver for signal conversion and amplification, we have achieved WDM transmission with a bandwidth of 19.8 THz. The experimental results show the great potential of silicon photonic devices in ultra-wideband WDM transmission.
Article
Engineering, Electrical & Electronic
Masato Yoshida, Takashi Kan, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa
Summary: The demonstration showcased a secure physical layer transmission at 10 Tbit/s achieved through digital coherent QAM quantum noise stream cipher (QNSC) and injection-locked WDM techniques. The use of an FPGA-based transmitter and receiver allowed for online transmission over 160 km with high spectral efficiency and enhanced security features.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Mingqing Zuo, Dawei Ge, JiaXin Liu, Yuyang Gao, Lei Shen, Xiaobo Lan, Zhangyuan Chen, Yongqi He, Juhao Li
Summary: This paper proposes an intermodal-MIMO-free MDM transmission scheme based on weakly coupled multiple-ring-core FMF, which achieves long-haul FMF transmission by reducing intermodal crosstalk. The feasibility of the scheme is verified through simulations and experiments, providing possibilities for practical applications of long-haul MDM techniques.
Article
Engineering, Electrical & Electronic
Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa
Summary: This paper discusses recent advances in achieving ultrahigh-speed optical time-division multiplexed transmission with a single-channel bit rate of over 10 Tbit/s using Nyquist pulses. The transmission methods include non-coherent Nyquist pulse transmission with differential quadrature phase-shift keying (DQPSK) and coherent Nyquist pulse transmission with quadrature amplitude modulation (QAM). These methods have demonstrated high transmission speeds and improved performance in terms of bit error rate and spectral efficiency.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Optics
Yannik Horst, Bertold Ian Bitachon, Laurenz Kulmer, Jannik Brun, Tobias Blatter, Jean-Marc Conan, Aurelie Montmerle-Bonnefois, Joseph Montri, Beatrice Sorrente, Caroline B. Lim, Nicolas Vedrenne, Daniel Matter, Loann Pommarel, Benedikt Baeuerle, Juerg Leuthold
Summary: Free-space optical (FSO) communication technologies are a solution for future satellite-ground networks to meet the demand for high bandwidth. In this experiment, we achieved Tbit/s level transmission over a 53.42 km freespace channel between two locations in Switzerland, demonstrating high data rates and throughput even under turbulent conditions. By employing adaptive optics and advanced modulation formats, we showed that next-generation Tbit/s satellite communications can be practical.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Xun Mu, Alessandro Ottino, Filipe M. Ferreira, Georgios Zervas
Summary: We propose an automated method for designing multi-core fibres, which uses neural networks to estimate coating loss and particle swarm optimization algorithm to explore optimal designs. The method achieves low crosstalk and maximizes effective mode area, and the fibres exceed the capacity of existing designs.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Optics
Guocheng Liu, Philip J. Poole, Zhenguo Lu, Jiaren Liu, Youxin Mao, Martin Vachon, Pedro Barrios
Summary: This research focuses on the use of InAs/InP quantum dot lasers as low-cost optical sources, demonstrating a frequency comb source with a high-speed data transmission capacity of 12.544 Tbit/s.
Article
Optics
Le He, Qiang Qiu, Xiaoke Yin, Zhimu Gu, Shaokun Liu, Wenzhen LI, Yingbin Xing, Yingbo Chu, Nengli Dai, Jinyan LI
Summary: The extended L-band 4-core Er/Yb co-doped fiber and amplifier (MC-EYDFA) is proposed and demonstrated for space division multiplexing combined with wavelength division multiplexing application for the first time. The bandwidth expansion is achieved by co-doping the fiber core with Er/Yb/P, extending the long wavelength to 1625 nm. Numerical simulations show efficient amplification and higher saturation power with 1018 nm cladding pumping. Experimental results of the integrated 4-core fiber amplifier show an average gain of approximately 22 dB covering 1575-1625 nm with a 4 W pump power and a 3 dBm total signal power, and a maximum core-dependent gain (CDG) variation of 1.7 dB.
Article
Optics
X. I. N. K. U. O. Yu, J. I. A. N. P. I. N. G. LI, J. I. A. N. Q. I. N. G. He, Y. U. W. E. N. Qin, N. I. N. G. Lin, Y. O. N. G. H. U. A. He, M. E. N. G. Xiang, S. O. N. G. N. I. A. N. Fu
Summary: We propose a high-speed multimode fiber short-reach optical interconnect system with fundamental mode transmission based on a digital-carrier Kramers-Kronig (DC-KK) scheme. By optimizing parameters such as the roll-off factor of the root-raised-cosine (RRC) filter, guard interval (GI) between signal and carrier tone, and carrier signal power ratio (CSPR), we experimentally demonstrated 200Gb/s 32-quadrature amplitude modulation (32QAM) signal transmission over a 12-km OM2 fiber with a bit error ratio (BER) below 4 x 10(-2). This is the highest experimental record of single lambda bitrate-distance product (SLBDP) achieved by direct-detection (DD)-based transmission over a standard multimode fiber (MMF) to date. This scheme has the potential to improve system performance without replacing the already deployed legacy MMFs for future large-capacity data center interconnects (DCIs).
Proceedings Paper
Engineering, Electrical & Electronic
Daiki Soma, Shohei Beppu, Yuta Wakayama, Seiya Sumita, Hidenori Takahashi, Noboru Yoshikane, Itsuro Morita, Takehiro Tsuritani, Masatoshi Suzuki
Summary: Experimental demonstration of 50.47-Tbit/s transpacific coupled multi-core fiber transmission using standard cladding ultra-low-loss coupled 4-core fibers shows that all SDM/WDM channels modulated with 24-Gbaud DP-QPSK exceeded the assumed FEC limits after 9,150-km transmission.
2021 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
A. Lorences-Riesgo, T-H Nguyen, S. Mumtaz, D. Le Gac, I. F. de Jauregui Ruiz, M. Sales-Llopis, S. Dris, Y. Frignac, G. Charlet
Summary: The study demonstrates the transmission of high-speed signals using advanced modulation techniques in challenging link conditions, with effective signal transmission achieved through power allocation optimization.
2021 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)
(2021)
Article
Engineering, Electrical & Electronic
Yang Hong, Stavros Deligiannidis, Natsupa Taengnoi, Kyle R. H. Bottrill, Naresh K. Thipparapu, Yu Wang, Jayanta K. Sahu, David J. Richardson, Charis Mesaritakis, Adonis Bogris, Periklis Petropoulos
Summary: We propose and demonstrate a bidirectional Vanilla-RNN based equalization scheme for O-band CWDM transmission. The Vanilla-RNN equalizer exhibits significantly better BER performance over the conventional DFE for both OOK and PAM4 formats, and is capable of compensating for linear and nonlinear impairments. Our results show that the Vanilla-RNN scheme is a viable solution for simple and effective equalization.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Optics
Shuai Wang, Zi-Lan Deng, Yujie Wang, Qingbin Zhou, Xiaolei Wang, Yaoyu Cao, Bai-Ou Guan, Shumin Xiao, Xiangping Li
Summary: This study presents an effective strategy for designing full Poincare sphere polarizers and implements it in a monolayer all-dielectric metasurface. By leveraging this strategy, it allows the transmission and conversion of polarization states located at arbitrary positions on the Poincare sphere, with high experimental efficiency.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Victor Sytnikov, Andrey Kashcheev, Mikhail Dubinin, Victor Karpov, Timofey Ryabin
Summary: Complex tests were conducted on all components of the HTS DC cable line within the National project for the implementation of a superconducting DC cable line with a capacity of 50 MW, 20 kV in the power system of St. Petersburg. The tests included analysis of liquid nitrogen temperature and flow rate variations, cable protection system, scheme of a two-circuit cryogenic unit, and connection plan for substation Tsentralnaya 330 kV and substation RP 9 220 kV. The HTS cable line connection to the St. Petersburg network is scheduled for the end of 2021.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Computer Science, Hardware & Architecture
R. Munoz, N. Yoshikane, R. Vilalta, J. M. Fabrega, L. Rodriguez, R. Casellas, M. Svaluto Moreolo, R. Martinez, L. Nadal, D. Soma, Y. Wakayama, S. Beppu, S. Sumita, T. Tsuritani, I. Morita
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2019)
Article
Computer Science, Hardware & Architecture
R. Munoz, N. Yoshikane, R. Vilalta, J. M. Fabrega, L. Rodriguez, D. Soma, S. Beppu, S. Sumita, R. Casellas, R. Martinez, T. Tsuritani, I. Morita
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2020)
Article
Engineering, Electrical & Electronic
Shohei Beppu, Daiki Soma, Seiya Sumita, Yuta Wakayama, Hidenori Takahashi, Takehiro Tsuritani, Itsuro Morita, Masatoshi Suzuki
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2020)
Article
Optics
Shohei Beppu, Koji Igarashi, Masahiro Kikuta, Daiki Soma, Tomoyuki Nagai, Yasuo Saito, Hidenori Takahashi, Takehiro Tsuritani, Itsuro Morita, Masatoshi Suzuki
Article
Computer Science, Hardware & Architecture
C. Manso, R. Munoz, N. Yoshikane, R. Casellas, R. Vilalta, R. Martinez, T. Tsuritani, I Morita
Summary: Network operators are tackling the challenge of increasing network capacity by a factor of 10 while maintaining cost efficiency, with optical disaggregation and SDM being considered key technologies to achieve this goal.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2021)
Article
Computer Science, Hardware & Architecture
Ricard Vilalta, Carlos Manso, Noboru Yoshikane, Ramon Casellas, Ricardo Martinez, Takehiro Tsuritani, Itsuro Morita, Raul Munoz
Summary: This paper presents an experimental evaluation of network protocols for control and management of optical networks and equipment. It introduces YANG data modeling language, multiple data models, telemetry protocols, and a zero-touch SDN controller architecture. The protocol implementations are experimentally evaluated and integration recommendations are provided.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Raul Munoz, Noboru Yoshikane, Ricard Vilalta, Ramon Casellas, Ricardo Martinez, Takehiro Tsuritani, Itsuro Morita
2020 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
S. Beppu, K. Igarashi, H. Mukai, M. Kikuta, M. Shigihara, D. Soma, T. Tsuritani, I Morita
2020 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)
(2020)
Proceedings Paper
Computer Science, Information Systems
Daiki Soma, Shohei Beppu, Hidenori Takahashi, Noboru Yoshikane, Itsuro Morita, Takehiro Tsuritani
2020 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATIONS (ECOC)
(2020)
Proceedings Paper
Computer Science, Information Systems
R. Vilalta, C. Manso, N. Yoshikane, R. Munoz, R. Casellas, R. Martinez, T. Tsuritani, I Morita
2020 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATIONS (ECOC)
(2020)
Proceedings Paper
Computer Science, Information Systems
R. Vilalta, N. Yoshikane, R. Casellas, R. Martinez, T. Tsuritani, I Morita, R. Munoz
2020 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATIONS (ECOC)
(2020)
Proceedings Paper
Computer Science, Information Systems
Shohei Beppu, Daiki Soma, Hidenori Takahashi, Noboru Yoshikane, Itsuro Morita, Takehiro Tsuritani
2020 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATIONS (ECOC)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Masatoshi Suzuki, Daiki Soma, Takehiro Tsuritani, Itsuro Morita
2020 22ND INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS (ICTON 2020)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
R. Munoz, N. Yoshikane, J. M. Fabrega, L. Rodriguez, R. Vilalta, D. Soma, S. Beppu, S. Sumita, R. Casellas, R. Martinez, T. Tsuritani, I. Morita
2019 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Takehiro Tsuritani, Daiki Soma, Yuta Wakayama, Yuichi Miyagawa, Mikoto Takahashi, Itsuro Morita, Koichi Maeda, Kohei Kawasaki, Toshikazu Matsuura, Masatoshi Tsukamoto, Ryuichi Sugizaki
2019 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
(2019)
