Article
Optics
Zhiqi Li, Li Pei, Jingjing Zheng, Jianshuai Wang, Wenxuan Xu, Tigang Ning, Jing Li
Summary: The air-hole assisted few-mode fiber (AH-FMF) offers modal intensity balance and gain equalization potential through adaptive ion doping. This paper proposes an AH-FM-EDF with a multi-layered erbium doping profile. By optimizing the erbium doping proportion, the proposed erbium-doped fiber achieves significant reduction in differential modal gain and exhibits good gain flattening and fabrication tolerance over the entire C-band.
Article
Engineering, Electrical & Electronic
Zhiqi Li, Li Pei, Jianshuai Wang, Jingjing Zheng, Wenxuan Xu, Tigang Ning, Jing Li
Summary: An air-hole-assisted few-mode erbium-doped fiber (AH-FM-EDF) with a uniform erbium ion doping profile is proposed for gain equalization. By introducing a central air hole, the distribution of the mode field is modified, resulting in a significant reduction in differential modal gain (DMG). Numerical simulations show that each mode can achieve a gain of 20 dB and the DMG is around 0.4 dB at 1550 nm for both core-pumping and cladding-pumping cases. Additionally, the amplifier demonstrates good gain-flattening performance with a noise figure (NF) of approximately 4.5 dB across the entire C-band, showcasing the flexibility and robustness of the proposed fiber for gain equalization due to its simple doping profile and pump-mode selection.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Wenxuan Xu, Li Pei, Jianshuai Wang, Jingjing Zheng, Zhiqi Li, Tigang Ning, Li Jing, Guobin Ren
Summary: This paper analyzes the gain characteristics of FM-EDFA with different mode combinations and wavelengths. The results show that under specific conditions, the multiplexing of different degenerate modes leads to differential mode gain (DMG). Compared with single-wavelength amplification, both the overall gain and the DMG decrease in the multi-wavelength case.
IEEE PHOTONICS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Zhiqi Li, Li Pei, Jingjing Zheng, Jianshuai Wang, Wenxuan Xu, Lei Shen, Li Zhong
Summary: In this paper, a well-matched triple-layered-core few-mode erbium-doped fiber (FM-EDF) was proposed and fabricated for low differential modal gain (DMG). Based on the fabricated FM-EDF, an amplifier was constructed experimentally. Results show that after long-haul FMF transmission and single-stage amplification, the difference in the output signal power is lower than 1.8 dB at the receiver. The fabricated FM-EDF is beneficial for practical MDM systems with high stability and signal channel equalization.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Jihene Lataoui, Alaaeddine Rjeb, Nejeh Jaba, Habib Fathallah, Mohsen Machhout
Summary: Space division multiplexing is a promising solution for improving transmission capacity and spectral efficiency. SDM over few mode multicore fibers is an attractive approach. This study focuses on the design of Raised Cosine (RC) profile for multicore fibers and proposes several promising candidate solutions.
OPTICAL FIBER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Jingxuan Yang, Wei Li, Hu Zhang, Xiaoguang Zhang, Lixia Xi, Wenbo Zhang
Summary: The study investigates the influence of twist-induced effect on anisotropic optical fiber performance both theoretically and numerically, showing that twisted optical fibers have superior optical properties and transmission characteristics compared to conventional fibers. This is advantageous for stable data transmission in large-capacity and long-distance optical fiber communication systems.
RESULTS IN PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Georg Rademacher, Ruben S. Luis, Benjamin J. Puttnam, Roland Ryf, Sjoerd van der Heide, Tobias A. Eriksson, Nicolas K. Fontaine, Haoshuo Chen, Rene-Jean Essiambre, Yoshinari Awaji, Hideaki Furukawa
Summary: This paper compares the use of 3-mode few-mode fibers and 3-core coupled-core multi-core fibers in space-division multiplexed transmission systems. The analysis shows that the coupled-core multi-core fiber achieves higher data rates at shorter transmission distances.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Beibei Cui, Shanyong Cai, Zhiguo Zhang
Summary: This paper focuses on relay assisted transmission in SDM wireless optical communication system, and develops a dual-hop SDM FSO communication model to demonstrate the performance improvement of the system with a relay.
IEEE PHOTONICS JOURNAL
(2022)
Article
Optics
Long Zhang, Li Pei, Jianshuai Wang, Jingjing Zheng, Kaihua Hu, Zhiqi Li, Tigang Ning, Jing Li, Li Zhong, Ruisi He
Summary: The amplification of long-haul mode division multiplexing (MDM) transmission systems is currently achieved through three steps, which can result in complexity and degraded transmission performance. To address this issue, this paper proposes an in-line few-mode erbium-doped fiber amplifier (FM-EDFA) based on cladding pumping, which enables simultaneous amplification and transmission in MDM systems. Experimental results demonstrate that the in-line FM-EDFA has excellent performance and shows great potential for practical long-haul transmission systems.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Cheng Yu, Wenqi Ma, Guijun Hu
Summary: In this paper, an all-fiber few-mode amplifier based on erbium-ytterbium co-doped double-clad fiber is designed and demonstrated. By developing a fiber-optic pump beam combiner and a few-mode isolator, and using a two-stage cascade method, a high-power, high-gain, and low-noise all-fiber few-mode fiber amplifier is realized. Simultaneous amplification of 6 modes is achieved.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Engineering, Electrical & Electronic
Jitao Gao, Elham Nazemosadat, Yi Yang, Songnian Fu, Ming Tang, Jochen Schroeder, Magnus Karlsson, Peter Andrekson
Summary: This study proposes an optical cross-connect scheme based on nonlinear optical fibers to achieve wavelength and spatial mode conversion, reducing cost and configuration complexity, which is suitable for future WDM-MDM networks.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Hafiz A. Khalid, Sibghat Ullah
Summary: In this paper, a system with multi-input multi-output (MIMO) transmission over 7-core few-mode fiber (FMF) is described by incorporating polarization division multiplexing and mode division multiplexing. By using the adaptive recursive least squares constant modulus algorithm (RLSCMA) at the receiver side, transmission data is successfully recovered by mitigating the effects of modal delay and mode coupling of received signals, improving the system performance of optical MIMO transmission systems.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Yuyang Gao, Dawei Ge, Lei Shen, Yongqi He, Zhangyuan Chen, Guifang Li, Juhao Li
Summary: This paper proposes a novel design and mode division multiplexing (MDM) scheme for short-reach optical transmission applications. Experimental results demonstrate the feasibility of this scheme in practical systems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
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
Optics
Komal Ojha, Darpan Mishra, Kumar Appaiah, Deepak Jain
Summary: This study investigates the use of graded-index few-mode fiber (GI-FMF) for mode-division-multiplexed transmission with a 4-LP-mode fiber. The GI-FMF is optimized for large effective indices differences (Delta n(eff)) and low differential mode delay (DMD) between LP modes by adjusting profile parameters, refractive index differences, and core radius. The optimized parameters for weakly-coupled WC-GI-FMF and strongly-coupled SC-GI-FMF are reported, demonstrating the potential of GI-FMF for various applications. The narrow air trench-assisted SC-GI-FMF is also explored to further reduce DMD.
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
Optics
Tomohiro Maeda, Atsushi Okamoto, Kazuhisa Ogawa, Akihisa Tomita, Yuta Wakayama, Takehiro Tsuritani
Article
Engineering, Electrical & Electronic
Thomas Gerard, Hubert Dzieciol, Eric Sillekens, Yuta Wakayama, Alex Alvarado, Robert I. Killey, Polina Bayvel, Domanic Lavery
JOURNAL OF LIGHTWAVE TECHNOLOGY
(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
Engineering, Electrical & Electronic
Lidia Galdino, Adrian Edwards, Wenting Yi, Eric Sillekens, Yuta Wakayama, Thomas Gerard, Wayne Sheldon Pelouch, Stuart Barnes, Takehiro Tsuritani, Robert I. Killey, Domanic Lavery, Polina Bayvel
IEEE PHOTONICS TECHNOLOGY LETTERS
(2020)
Article
Optics
Yuta Wakayama, Thomas Gerard, Eric Sillekens, Lidia Galdino, Domanic Lavery, Robert Killey, Polina Bayvel
Summary: The experimental study explored the use of high-order geometric constellation shaping to increase achievable information rates in standard intradyne coherent transmission systems, with the highest AIR reaching 18.0 b/4D-symbol. After transmission through 100 km of single-mode fiber and subtracting pilot overhead, the system achieved an information rate of 16.9 b/4D-symbol, representing the highest-order GS format demonstrated to date.
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
Shuanglu Zhang, Atsushi Okamoto, Yuta Abe, Ryo Watanabe, Akihisa Tomita, Daiki Soma, Yuta Wakayama, Takehiro Tsuritani
Summary: This paper proposes a spatial-light-modulator-based optical-fiber joint switch for few-mode multicore fibers, which can route all spatial channels together as a unit. The method allows for switching signal paths to target output ports while maintaining mode-field patterns of the diffracted light. Furthermore, changing the position of the output port in the proposed method significantly reduces maximum port crosstalk.
Article
Optics
Daiki Soma, Shohei Beppu, Yuta Wakayama, Seiya Sumita, Hidenori Takahashi, Noboru Yoshikane, Itsuro Morita, Takehiro Tsuritani, Masatoshi Suzuki
Summary: The total capacity of optical submarine cable systems is necessary to be expanded continuously as a global communication infrastructure. In this paper, high-capacity trans-Pacific class transmission is achieved using standard cladding uncoupled 4-core fibers. Additionally, the characteristics of coupled and uncoupled MCFs applied to optical submarine cable systems are summarized based on the results of this study and previous experiments.
Article
Engineering, Electrical & Electronic
Daniel J. Elson, Yuta Wakayama, Vitaly Mikhailov, Daryl Inniss, Jiawei Luo, Noboru Yoshikane
Summary: We demonstrate reach extension for 400GBASE-LR8 signals in an installed multimanufacturer multicore fibre link using a bismuth-doped fibre amplifier as a preamplifier. The reach is extended to 28 km without any frame loss caused by intercore-crosstalk over a 24-hour period. This connectorised multimanufacturer multicore fibre configuration with off-the-shelf transceivers can achieve a single fibre throughput of 1.6 Tb/s.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Yuta Wakayama, Daniel J. Elson, Vitaly Mikhailov, Rachata Maneekut, Jiawei Luo, Noboru Yoshikane, Daryl Inniss, Takehiro Tsuritani
Summary: We extend the transmission distance of 400GBASE-LR4 and 400GBASE-LR8 systems using simple and ultrawideband single-stage bismuth-doped fiber amplifiers (BDFAs). The transmission reach of 400GBASE-LR4 and 400GBASE-LR8 transceivers was successfully extended from 10 km to 20 and 90 km, respectively. Stable transmission links were maintained for both systems over a period of seven days. Furthermore, BDFAs were shown to maximize the transmission reach up to the chromatic dispersion limit and can be used to upgrade cost-effective transceivers for 400ZR applications.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Proceedings Paper
Optics
Yuta Abe, Atsushi Okamoto, Kazuhisa Ogawa, Akihisa Tomita, Daiki Soma, Yuta Wakayama, Takehiro Tsuritani
NEXT-GENERATION OPTICAL COMMUNICATION: COMPONENTS, SUB-SYSTEMS, AND SYSTEMS IX
(2020)
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)
Proceedings Paper
Engineering, Electrical & Electronic
Shohei Beppu, Daiki Soma, Yuta Wakayama, Seiya Sumita, Koji Igarashi, Hidenori Takahashi, Takehiro Tsuritani
2019 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
(2019)
