Article
Engineering, Electrical & Electronic
Dongdong Zou, Fan Li, Wei Wang, Zixuan Zhang, Jinkun Hu, Jianping Li, Qi Sui, Chao Lu, Zhaohui Li
Summary: The article demonstrates a high-speed PAM communication system for rack-rack optical interconnects, achieving a transmission rate of over 1.6 Tb/s using MDM and WDM technologies. Nonlinear impairment mitigation techniques such as LUT and VNLE were employed to improve system performance.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Ze Dong, Xiangjun Xin
Summary: This paper proposes a novel symbol division multiplexing (SDM) technology for optical interconnection, which increases the line rate and improves the transmission reliability by multiplexing two standard PAM8 symbols. It also represents an important development in coding and modulation multiplexing techniques.
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
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
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
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
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
Kazunori Seno, Naru Nemoto, Keita Yamaguchi, Mitsumasa Nakajima, Kenya Suzuki, Yutaka Miyamoto
Summary: The increase in communications network traffic has created a need for larger transmission capacity. The combination of wavelength division multiplexing (WDM) and space-division multiplexing (SDM) is being investigated to meet this demand. Multi-core fiber SDM systems offer increased network flexibility and proportional transmission capacity to the number of SDM channels. However, the increase in input/output ports poses challenges. The spatial and planar optical circuit (SPOC) technology allows for the integration of multiple WSSs and filters, contributing to device miniaturization.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Jiahua Yang, Xiaopeng Dong
Summary: This article proposes a novel multipoint gas detection scheme based on the photothermal effect and interferometer. By incorporating fiber Bragg gratings with different central wavelengths in the interferometer, gas concentration information can be extracted from different gas cells, enabling simpler and more efficient installation. The experiment validates the effectiveness of the method in reducing noise and crosstalk, and demonstrates successful acetylene detection.
IEEE SENSORS JOURNAL
(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
Weigang Hou, Pengxing Guo, Lei Guo, Xu Zhang, Hui Chen, Weichen Liu
Summary: This paper proposes O-Star, a scalable optical switching architecture for on-chip many-core systems. It utilizes hybrid mode and wavelength division multiplexing technology to enable non-blocking switching and parallel data transmission.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Benshan Wang, Thomas Ferreira de Lima, Bhavin J. Shastri, Paul R. Prucnal, Chaoran Huang
Summary: Digital signal processing (DSP) has played a crucial role in optical communication systems, but the limitations of DSP chips have hindered the deployment of computationally costly algorithms. Photonic neural networks offer a promising solution to these challenges, with better performance and lower power consumption. This study proposes a photonic recurrent neural network (RNN) capable of processing optical signals and effectively addressing fiber nonlinearities in the photonic domain, achieving reduced power consumption and latency compared to traditional DSP chips.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
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
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)
