Article
Engineering, Electrical & Electronic
Shimpei Shimizu, Takayuki Kobayashi, Takushi Kazama, Masanori Nakamura, Akira Kawai, Koji Enbutsu, Takeshi Umeki, Yutaka Miyamoto
Summary: This paper investigates the conversion of gain saturation into nonlinear amplitude distortion in a 64-Gbaud 64QAM WDM signal in a periodically poled LiNbO3 (PPLN) based optical parametric amplifier (OPA). The results show that increasing the number of WDM channels can suppress nonlinear amplitude distortion, and for a 75-GHz-spacing 64-channel WDM configuration, the total input power tolerance was improved by about 10 dB compared to a single-channel case. The experiment also confirms that there is almost no wavelength dependence of the effect of gain saturation on the signal distortion.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Yingning Wang, Yuanpeng Liu, Wenqian Zhao, Jian Yang, Wenpu Geng, Yuxi Fang, Changjing Bao, Yongxiong Ren, Zhi Wang, Yan-ge Liu, Zhongqi Pan, Yang Yue
Summary: This paper designs and analyzes a multi-ring-air-core fiber supporting thousands of OAM modes, and investigates the tradeoffs between ring number/density and system performance parameters. Based on the analytical results, the fiber has high transmission rate and spectrum efficiency, and shows great potential for various applications in optical communication systems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Maria Ionescu, Jeremie Renaudier, Amirhossein Ghazisaeidi, Arnaud Leroy, Olivier Courtois
Summary: Historically, undersea systems focused on maximizing fiber throughput, but now higher optical power efficiency is desired. Adaptive transponders and machine learning are considered for subsea line design to adapt to power constraints and improve reliability and efficiency.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Vladimir Gordienko, Filipe M. Ferreira, Chandra B. Gaur, Nick J. Doran
Summary: The study focuses on polarization insensitive fiber optical parametric amplifiers utilizing a balanced polarization diversity loop with at least two unidirectional gain fibers. Three variants of looped polarization insensitive FOPAs optimized for noise figure, mitigation of nonlinear impairments, and their trade-off are described and compared. Testing results demonstrate the ability of these FOPAs to deliver low noise figures <6 dB for output signal power as high as 29 dBm while enabling polarization insensitive gain.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Manabu Arikawa, Mingqi Wu, Keisuke Yasuhara, Daishi Masuda, Kazunori Hayashi, Takanori Inoue, Yoshihisa Inada
Summary: We conducted long-haul transmissions over coupled four-core fibers in a 15-km-long submarine cable, achieving small propagation loss and spatial-mode dispersion. Using adaptive multi-layer filters, we obtained error-free transmission up to 6000 km with 16-channel wavelength-division multiplexed and 4-core space-division multiplexed signals. We also evaluated transmission performance and mode dependent loss, and found that further suppression of MDL is necessary for longer distances and more stable performance.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Computer Science, Information Systems
Cong Zou, Fang Yang, Jian Song, Zhu Han
Summary: This letter proposes a multi-carrier autoencoder incorporating the DCO-OFDM scheme to efficiently deal with time-varying diffuse underwater optical channels in UWOC. Simulation results show that the proposed multi-carrier AE outperforms other state-of-the-art techniques.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Hitoshi Takeshita, Yusuke Shimomura, Kohei Hosokawa
Summary: This work investigates the feasibility of improving the energy efficiency of a cladding-pumped multicore (MC) EDFA by utilizing bidirectional (BD) pumping. It demonstrates that the optical power loss due to equalization can be reduced by controlling the optical power ratio of the forward and backward pumps. Under optimized conditions, a 1.7% pump conversion efficiency improvement and a 24% reduction in total optical pump power compared to conventional MC-EDFA were achieved.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Hrishikesh Srinivas, Oleksiy Krutko, Joseph M. Kahn
Summary: Scaling up cable capacity in long-haul optical communication is a goal of spatial-division multiplexing (SDM). Multicore or multimode fiber systems promise higher integration, but efficient coupling of pump light and mode-dependent gain control pose challenges. We propose an integrated multimode amplifier design that excites only four pump spatial modes and predicts flat gain, low noise figure, and minimal mode-dependent gain over a wide bandwidth.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Chawaphon Prayoonyong, Bill Corcoran
Summary: Microring resonators can act as selective filters for amplified optical frequency combs, reducing the impact of broadband noise. Comb distillation, the approach used in amplifying low-power microcombs, can significantly lower the required optical-carrier-to-noise ratio for optical communications. This paper establishes closed form solutions for noise after distillation and directly links it to achievable system signal-to-noise ratio, allowing for the assessment of system performance with changes in the bandwidth and coupling loss of the distilling MRR device. This can help predict the increased usability of microcombs for superchannel transmission or space-division-multiplexing systems based on a distilled microcomb.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Vivek Arya, Meet Kumari, Hamza Mohammed Ridha Al-Khafaji, Syed Alwee Aljunid
Summary: In this paper, a high-speed, long-reach integrated free space optics (FSO)-passive optical network (PON) system using non-orthogonal multiple access visible light communication (NOMA-VLC) is proposed for satellite-to-underwater applications. It offers high data rate, high security, long-reach and low cost.
Article
Engineering, Electrical & Electronic
Tetsuya Hayashi, Taiji Sakamoto, Yusuke Yamada, Roland Ryf, Rene-Jean Essiambre, Nicolas Fontaine, Mikael Mazur, Haoshuo Chen, Takemi Hasegawa
Summary: Randomly-coupled multi-core fiber (MCF) technology has gained attention for its applicability in long-haul transmission systems. Compared to weakly-coupled MCFs, randomly-coupled MCFs can achieve higher spatial channel density and lower transmission loss using existing single-mode fiber core designs. This article provides an overview of the advancements in randomly-coupled MCF technology, including its classification, design, optical property characterization methods, and performance improvements in transmissions.
PROCEEDINGS OF THE IEEE
(2022)
Article
Engineering, Electrical & Electronic
Shaoyi Chen, Kun Zhu, Jun Han, Qi Sui, Zhaohui Li
Summary: This article presents work on coastal event monitoring using photonic integrated sensing and communication technology with submarine telecommunication optical cables. The study highlights ocean wave analysis, earthquake detection, and marine ferry monitoring. The proposed integrated system successfully observed ocean waves, microseisms, earthquakes, and vessel sailing activities, opening up new opportunities for future research in ocean science and marine engineering.
IEEE COMMUNICATIONS MAGAZINE
(2022)
Article
Engineering, Electrical & Electronic
Yaoxin Liu, Lars Sogaard Rishoj, Michael Galili, Quentin Saudan, Yunhong Ding, Leif Katsuo Oxenlowe, Toshio Morioka
Summary: We designed and fabricated a silicon photonic orbital angular momentum (OAM) multiplexer (MUX) chip for simultaneous wavelength-division multiplexing (WDM) and OAM mode-division multiplexing (MDM) in optical fiber communication systems. Using this chip, we successfully demonstrated simultaneous 3 OAM MDM transmission and OAM MDM/WDM transmission in an 800-m OAM ring-core fiber. The achieved bit error rates (BERs) were below the 7% forward error correction (FEC) limit using 10 Gbit/s on-off keying (OOK) signals.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Takashi Sasaki, Fumiaki Sato, Brian G. Risch, Peter A. Weimann
Summary: Optical fiber cables have become essential data transmission media since the 1980s, with deployments increasing continuously. The industry has developed high-density and small-diameter cables to support modern applications like cloud storage and data centers. These advancements allow for large data capacity to be installed in limited underground spaces.
PROCEEDINGS OF THE IEEE
(2022)
Article
Engineering, Electrical & Electronic
Shan Wang, Hailin Yang, Yuwen Qin, Di Peng, Songnian Fu
Summary: This study investigates the potential of space division multiplexing (SDM) for power-over-fiber (PWoF) technique, and verifies it through weakly-coupled multicore fiber (WC-MCF) design and experiments. The results show that the SDM-enabled PWoF scheme is superior to the wavelength division multiplexing (WDM) scheme in terms of energy light delivery scalability and wavelength division multiplexing savings.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Oleg V. Sinkin, Alexey V. Turukhin, Yu Sun, Hussam G. Batshon, Matt V. Mazurczyk, Carl R. Davidson, Jin-Xing Cai, Will W. Patterson, Maxim A. Bolshtyansky, Dmitri G. Foursa, Alexei N. Pilipetskii
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2018)
Article
Computer Science, Hardware & Architecture
M. Cantono, A. Ferrari, D. Pilori, E. Virgillito, J. L. Auge, V. Curri
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2019)
Article
Computer Science, Hardware & Architecture
Matt Newland, Rene Schmogrow, Mattia Canton, Vijay Vusirikala, Tad Hofmeister
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2020)
Article
Engineering, Electrical & Electronic
Mattia Cantono, Rene Schmogrow, Matt Newland, Vijay Vusirikala, Tad Hofmeister
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2020)
Article
Engineering, Electrical & Electronic
Jin-Xing Cai, Matthew Vincent Mazurczyk, Hussam G. Batshon, Milen Paskov, Carl R. Davidson, Yue Hu, Oleg Sinkin, Maxim A. Bolshtyanskye, Dmitri G. Foursa, Mexei N. Pilipetskii
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2020)
Article
Multidisciplinary Sciences
Zhongwen Zhan, Mattia Cantono, Valey Kamalov, Antonio Mecozzi, Rafael Mueller, Shuang Yin, Jorge C. Castellanos
Summary: Using fiber-optic sensing technology to detect seismic and water waves along submarine cables can fill data gaps in submarine earthquake research and has potential implications for earthquake and tsunami monitoring. This method, which does not require specialized equipment, is highly scalable.
Article
Optics
Antonio Mecozzi, Mattia Cantono, Jorge C. Castellanos, Valey Kamalov, Rafael Muller, Zhongwen Zhan
Summary: This study analyzes the polarization modulation at the output of a submarine link, providing insights into the factors affecting the observed polarization modulation and suggesting that pressure-induced strain may be the origin of the observed polarization modulations in long submarine cables.
Article
Engineering, Electrical & Electronic
J-X Cai, M. Mazurczyk, G. Vedala, Y. Hu, O. Sinkin, M. A. Bolshtyansky, D. G. Foursa, A. N. Pilipetskii
Summary: The text describes the achievement of record optical power efficiency and corresponding optimum spectral efficiency over various transmission distances through the utilization of different technologies and methods.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
G. Marra, D. M. Fairweather, V Kamalov, P. Gaynor, M. Cantono, S. Mulholland, B. Baptie, J. C. Castellanos, G. Vagenas, J-O Gaudron, J. Kronjager, I. R. Hill, M. Schioppo, I. Barbeito Edreira, K. A. Burrows, C. Clivati, D. Calonico, A. Curtis
Summary: Optical fiber-based sensing technology can utilize existing submarine communication cables as seafloor sensors to detect earthquakes and ocean signals. This technique allows for the installation of numerous real-time environmental sensors on the undersea cables without the need for changes to the underwater infrastructure.
Article
Optics
Dario Pilori, Mattia Cantono, Alessio Ferrari, Andrea Carena, Vittorio Curri