Article
Engineering, Electrical & Electronic
Ezra Ip, Yue-Kai Huang, Ming-Fang Huang, Fatih Yaman, Glenn Wellbrock, Tiejun Xia, Ting Wang, Koji Asahi, Yoshiaki Aono
Summary: This study reports the first distributed acoustic sensing (DAS) experiment with a transmission distance of over 1,000 km. The experiment used a hybrid link consisting of field and lab fibers with bi-directional inline Raman amplification. A frequency-diversity chirped-pulse system was employed for the probe signal, and the Rayleigh backscatter was recovered using a coherent receiver with correlation detection and diversity combining. The experiment achieved a measurand resolution of approximately 100 p epsilon/root Hz at a gauge length of 20 meters in offline testing. In addition, the study demonstrated the first real-time FPGA implementation of chirped-pulse DAS without frequency diversity, covering a range of 210 km.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
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
Engineering, Electrical & Electronic
Jose M. Castro, Rick Pimpinella, Bulent Kose, Paul Huang, Asher Novick, Brett Lane
Summary: This study introduces a theoretical model and experiments focusing on estimating and measuring MCDI over multimode optical channels using VCSEL transceivers, evaluating the impact on PAM-4 signals and bit error rate performance at data rates between 100 and 112 Gbps. The analysis highlights potential methods to improve the reach of multimode fiber channels.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Sicong Xu, Bohan Sang, Lingchuan Zeng, Li Zhao
Summary: For W-band long-range mm-wave wireless transmission systems, nonlinearity issues can be handled by deep learning equalization algorithms. Additionally, the combination of phase-shift modulation and random oversampling techniques improves the overall performance. Our proposed equalization scheme achieved high-speed wireless transmission over both optical fiber and air with improved receiver sensitivity and reduced complexity.
Article
Engineering, Electrical & Electronic
Miao Kong, Kaihui Wang, Junjie Ding, Jiao Zhang, Weiping Li, Junting Shi, Feng Wang, Li Zhao, Cuiwei Liu, Yanyi Wang, Wen Zhou, Jianjun Yu
Summary: We experimentally demonstrated a high-speed WDM transmission over ultra long distance, with significant improvements in transmission distance and sensitivity through innovative technologies and modulation schemes.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Qihang Wang, Bohan Sang, Junting Shi, Bowen Zhu, Feng Wang, Wen Zhou
Summary: Probabilistic shaping technique can reduce SNR requirement and save transmission power in mm-wave long-distance wireless transmission. Traditional DSP algorithms are affected by the uneven probability distribution of constellation points in PS signals. We propose a novel complex-valued classifier with a weighted loss function to replace traditional algorithms in PS-16QAM W-band long-distance transmission. The proposed algorithm provides about 0.5 dBm receiving sensitivity improvement and reduces training sequence length by 4%-7%, computational complexity by 10.53%-16.89%, and number of training iterations by 23.08%.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Yang Hong, Natsupa Taengnoi, Kyle R. H. Bottrill, Naresh K. Thipparapu, Yu Wang, Jayanta K. Sahu, David J. Richardson, Periklis Petropoulos
Summary: This study reports the longest 50-Gb/s/lambda O-band wavelength-division multiplexed transmission system to date. By using in-house built bismuth-doped fiber amplifiers and Kramers-Kronig detection-assisted single-sideband transmission, the challenges of fiber loss and chromatic dispersion are overcome. The experimental results demonstrate that a transmission distance of up to 100 km can be achieved on all 50-Gb/s channels without the need for in-line optical amplification.
Article
Engineering, Electrical & Electronic
Pham Tien Dat, Francois Rottenberg, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
Summary: The proposed 3x3 MIMO fiber-wireless system in the W-band with WDM and PDM capabilities achieved total capacities of approximately 110 Gb/s and 132 Gb/s with corresponding spectral efficiencies of approximately 8.5 and 10.2 bit/s/Hz, respectively. The system demonstrated satisfactory performance for offset quadrature amplitude modulation-based filter-bank multicarrier signals, and is applicable to WDM and combined WDM/PDM RoF transmissions. It provides a scalable solution for large-scale MIMO signal transportation and shows promise for future mobile transport and radio access networks in high-frequency bands.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Shi Jia, Longsheng Li, Yan Fu, Leif Katsuo Oxenlowe, Hao Hu
Summary: To meet the demand of exponentially increasing global wireless traffic, wireless communication has transitioned into the millimeter wave band. Integrated light source-based IM-DD photonic-wireless systems are better suited for future wireless applications requiring high speed, low cost, small footprint, and simple configuration.
Article
Engineering, Electrical & Electronic
Wenpeng Gao, Yuyuan Gao, Dongxu Lu, Ming Luo, Haibo Li, Jiahao Huo, Xian Zhou
Summary: This paper investigates the transmission of probabilistic shaped polarization-division-multiplexed eight-level pulse amplitude modulated (PS-PDM-PAM-8) signal over multi-core fiber (MCF) using coherent detection. A modified signal phase-based LMS (SP-LMS) algorithm is proposed to equalize both intensity-modulated and filed modulated PS PAM signals. By employing PS and MCF transmission, a total rate of 448 Gb/s is achieved and compared with traditional PDM-PAM4 signal, a 22.4 Gb/s gain in net bit rate can be achieved.
OPTICAL FIBER TECHNOLOGY
(2022)
Article
Optics
Yuqing Wu, Ziheng Zhang, Hanwen Luo, Lei Deng, Qi Yang, Xiaoxiao Dai, Deming Liu, Xiaojing Gao, Yongqin Yu, Mengfan Cheng
Summary: This paper proposes a coherent optical secure transmission system based on analog-digital hybrid chaos. By introducing an analog-digital converter and a bit extraction, broadband analog chaos is converted to a binary digital signal and then mapped to a pulse amplitude modulation signal for transmission. The system achieves long-haul high-quality chaotic synchronization and high-performance secure communication, supporting the secure transmission of QPSK signals over 1000 km fiber.
Article
Optics
Bo Liu, Xinxing Guo, Weicheng Kong, Tao Liu, Ruifang Dong, Shougang Zhang
Summary: This paper proposes an analog-digital hybrid PID control compensation system to address the issue of propagation delay in fiber-based time synchronization systems. By transmitting the time signal in both directions through fiber and constructing a feedback loop, the system significantly improves the stability of time synchronization. Experimental results demonstrate that the system achieves high-precision time synchronization in long-distance fiber links.
Article
Engineering, Electrical & Electronic
Yuyuan Gao, Wenpeng Gao, Ming Luo, Haibo Li, Jiahao Huo, Dongxu Lu, Xian Zhou
Summary: This paper investigates the feasibility and effectiveness of the field PDM-PAM4 coherent system over multi core fiber (MCF) for inter-data center transmissions. The signal-phase aid least-mean square (SP-LMS) and training multi-modulus algorithm (TMMA) are modified and analyzed for equalization and polarization demultiplexing. The results demonstrate successful transmission of 4x112 Gb/s field PDM-PAM4 signals over 16 km MCF and 384 km SSMF in C-band with a BER below 3.8e-3.
IEEE PHOTONICS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Miao Kong, Junting Shi, Bohan Sang, Junjie Ding, Kaihui Wang, Weiping Li, Feng Wang, Cuiwei Liu, Yanyi Wang, Yiran Wei, Bowen Zhu, Li Zhao, Wen Zhou, Jianjun Yu
Summary: We present a feasible solution for long-distance wavelength division multiplexing (WDM) coherent optical fibre transmission at 800-Gb/s per carrier using offline DSP. Through experiments, we achieved 5-carrier 125-GHz-spacing WDM coherent optical fibre transmission with a transmission distance of 2000 km and a net bit rate of 800-Gb/s per carrier. Our proposed techniques, including the utilization of advanced components and modulation format, as well as the introduction of a multiple-input multiple-output (MIMO) Volterra equalizer (VE), significantly improve the performance of the transmission system.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Minsik Kim, Byung Gon Kim, Sunghyun Bae, Yun C. Chung
Summary: The study evaluates the feasibility of using the mode-field matched center-launching (MCL) technique in the 850-nm band, achieving high coupling efficiency by optimizing splicing conditions. It is confirmed that the MCL technique can make the frequency-response characteristics of the multi-mode fiber link almost identical to that of the single-mode fiber link.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Saki Nozoe, Takashi Matsui, Kyozo Tsujikawa, Masaaki Taruno, Hirokazu Kubota, Masaharu Ohashi, Kazuhide Nakajima
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2018)
Article
Optics
Hirokazu Kubota, Nobuaki Kosake, Yuji Miyoshi, Masaharu Ohashi
Article
Engineering, Electrical & Electronic
Yasuhiro Tsutsumi, Kenta Kitahara, Masaharu Ohashi, Hirokazu Kubota, Yuji Miyoshi, Ikuo Yamashita
ELECTRONICS AND COMMUNICATIONS IN JAPAN
(2020)
Proceedings Paper
Optics
Yui Shindo, Yasuhiro Tsutsumi, Masaharu Ohashi, Yuji Miyoshi, Hirokazu Kubota
2019 ASIA COMMUNICATIONS AND PHOTONICS CONFERENCE (ACP)
(2019)
Proceedings Paper
Optics
Tatsuya Terai, Hirokazu Kubota, Yuji Miyoshi, Masaharu Ohashi
2019 ASIA COMMUNICATIONS AND PHOTONICS CONFERENCE (ACP)
(2019)
Proceedings Paper
Optics
Kenta Kitahara, Yasuhiro Tsutsumi, Masaharu Ohashi, Yuji Miyoshi, Hirokazu Kubota
2019 ASIA COMMUNICATIONS AND PHOTONICS CONFERENCE (ACP)
(2019)
Proceedings Paper
Optics
S. Nakata, Y. Miyoshi, H. Kubota, M. Ohashi
23RD OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC2018)
(2018)
Proceedings Paper
Optics
H. Kubota, N. Kosake, Y. Miyoshi, M. Ohashi
23RD OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC2018)
(2018)
Proceedings Paper
Optics
Ryuki Miyazaki, Masaharu Ohashi, Hirokazu Kubota, Yuji Miyoshi, Nori Shibata, Yusuke Sasaki, Kazuhiko Aikawa
23RD OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC2018)
(2018)
Proceedings Paper
Optics
K. Morimoto, Y. Miyoshi, H. Kubota, M. Ohashi
23RD OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC2018)
(2018)
Proceedings Paper
Optics
Masaharu Ohashi, Tomoya Kawasaki, Yuji Miyoshi, Hirokazu Kubota, Ryo Maruyama, Nobuo Kuwaki
2018 ASIA COMMUNICATIONS AND PHOTONICS CONFERENCE (ACP)
(2018)
Proceedings Paper
Optics
Shota Maeda, Kosuke Morimoto, Shiho Nakata, Yuji Miyoshi, Hirokazu Kubota, Masaharu Ohashi
2018 ASIA COMMUNICATIONS AND PHOTONICS CONFERENCE (ACP)
(2018)
Proceedings Paper
Engineering, Electrical & Electronic
Yasuhiro Tsutsumi, Takahiro Hase, Masaharu Ohashi, Yuji Miyoshi, Hirokazu Kubota
2017 OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) AND PHOTONICS GLOBAL CONFERENCE (PGC)
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
Yusuke Koike, Masaharu Ohashi, Hirokazu Kubota, Yuji Miyoshi
2017 OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) AND PHOTONICS GLOBAL CONFERENCE (PGC)
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
Kosuke Morimoto, Yuji Miyoshi, Hirokazu Kubota, Masaharu Ohashi
2017 OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC) AND PHOTONICS GLOBAL CONFERENCE (PGC)
(2017)
