Article
Engineering, Electrical & Electronic
Dan M. Marom, Yutaka Miyamoto, David T. Neilson, Ioannis Tomkos
Summary: The forthcoming capacity scaling requirements and advances in optical fiber communications bring new opportunities and challenges for exploiting the expanded spectral and spatial resources. Networks are facing tremendous traffic growth pushing existing implementations to their limits, requiring new efficient and cost-effective switching solutions for supporting future traffic growths.
PROCEEDINGS OF THE IEEE
(2022)
Article
Engineering, Electrical & Electronic
Enrico Forestieri, Marco Secondini, Luca Poti, Fabio Cavaliere
Summary: This paper discusses several modulation techniques aimed at ensuring high capacity and low latency for the next generation of mobile transport networks. It emphasizes the importance of low-cost transceivers. The study shows that direct-detection formats cannot achieve a bit-rate greater than 50 Gb/s at distances around 20 km, and coherent detection is necessary.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Madina Shaimerdenova, Takhmina Ayupova, Aliya Bekmurzayeva, Marzhan Sypabekova, Zhannat Ashikbayeva, Daniele Tosi
Summary: This study presents a spatial-division multiplexing method for fiber-optic ball resonators, which has been experimentally validated to be highly efficient and capable of designing a sensing network with reasonable penalties. The method enables simultaneous detection of different cancer biomarkers.
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
Itay Yahav, Nir Sheffi, Yacov Biofcic, Dan Sadot
Summary: This article discusses the application of spatial-division multiplexing in automotive industry for multicore plastic optical fiber sensor fusion networks. The experimental demonstration of a low-cost system with high data rates meets the requirements of the automotive industry.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
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
Anirudh Vijay, Joseph M. Kahn
Summary: Direct-detection links using mode division multiplexing (MDM) in multimode fiber (MMF) can compensate for crosstalk by employing receiver-side optical signal processing (OSP), and to enable MDM in higher-order mode groups, transmitter-side OSP is proposed. However, modal dispersion and higher-order modal dispersion (MD) limit the performance of OSP in mitigating inter-symbol interference and crosstalk. The impact of higher-order MD can be predicted by the PM coherence bandwidth or the group-delay spread within a mode group.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Computer Science, Hardware & Architecture
Rene Bonk, Ed Harstead, Robert Borkowski, Vincent Houtsma, Yannick Lefevre, Amitkumar Mahadevan, Dora van Veen, Michiel Verplaetse, Sheldon Walklin
Summary: This article assesses the current status of 25G and 50G time division multiplexed passive optical network (TDM PON) technologies by leveraging the cost efficiencies of Ethernet intra-datacenter ecosystem. The study predicts the impact of flexible modulation enhancement on 50G PON and concludes that a majority of future 50G PON optical network units can operate at 100 Gb/s PAM4. The options for a 100G PON capable of supporting full loss budget and reach requirements are also evaluated, with the conclusion that intensity-modulation and direct-detection (IM-DD) will be a strong contender for the next generation of PON after 50 Gb/s.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2023)
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
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
Jingnan Li, Xiaofei Su, Tong Ye, Hisao Nakashima, Takeshi Hoshida, Zhenning Tao
Summary: Intensity modulation and direct detection systems are widely used in short-reach optical networks. This paper proposes a practical and accurate method to characterize nonlinear distortion and estimate system performance in IM-DD systems. The method of measuring the noise-to-power ratio using a notch is employed in DM-DFB laser-based IM-DD systems, accurately characterizing the nonlinear distortion. The system performance can be estimated by the equivalent additive noise model.
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
Computer Science, Hardware & Architecture
Georgios Drainakis, Peristera Baziana, Adonis Bogris
Summary: In this work, an efficient data center network (DCN) architecture using optical packet switching is proposed. The architecture includes intra-rack, inter-rack, and bridge optical networks, providing high bandwidth utilization and low end-to-end latency.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2023)
Article
Engineering, Electrical & Electronic
Fatima Al-Shaikhli, Maurice O'Sullivan, Rongqing Hui
Summary: Electrostriction in an optical fiber is introduced by the interaction between the forward propagated optical signal and the acoustic standing waves. A novel technique for characterizing fiber properties is demonstrated by measuring the electrostriction response under intensity modulation. By subtracting the measured spectrum from its complex conjugate, the signal to noise ratio can be significantly increased. The envelope of the electrostriction-induced loss spectrum closely follows a Maxwellian distribution, which can be determined by a single parameter if the transversal field distribution of the fiber propagation mode is Gaussian.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
