Article
Optics
TianJin Wen, Shecheng Gao, Wei Li, Jiajing Tu, Cheng Du, Ji Zhou, Zhaohuan Ao, Bin Zhang, Weiping Liu, Zhaohui Li
Summary: A ring-core erbium-doped fiber supporting up to the fourth-order orbital angular momentum mode was designed for OAM mode multiplexed amplification, demonstrating amplification of the third- and fourth-order OAM modes with ultra-low differential mode gain and average gain of >19 dB for four modes.
Article
Materials Science, Multidisciplinary
Xingtao Zhao, Zhiwei Li, Yufeng Cheng, Juncheng Li, Ying Han
Summary: In this paper, a novel nested concentric circle anti-resonant hollow-core fiber with double-layer cladding structure and an outer cladding ring is proposed. The optimized fiber has low loss, wide bandwidth, and the ability to withstand movement and rotation.
RESULTS IN PHYSICS
(2022)
Article
Optics
Ruihuan Zhang, Xingfeng Li, Yu He, Gang Chen, Liangming Xiong, Haoshuo Chen, Nicolas K. Fontaine, Yong Zhang, Weiqiang Xie, Yikai Su
Summary: This article proposes a multimode coupling solution based on a rectangular core few-mode fiber and an integrated multimode coupler to achieve high bandwidth-density optical interconnects. Through corresponding experiments, a bandwidth density of up to 19.4 Tb s mm -1 is achieved at the chip facet, with the DSP power consumption controlled below 6% of a conventional system.
LASER & PHOTONICS REVIEWS
(2023)
Article
Computer Science, Information Systems
Miaofang Zhou, Ping Jiang, Huajun Yang, Weinan Caiyang, Yan Qin, Yifan Zheng
Summary: This paper proposes a new type of optical fiber structure with air trenches, air holes, and a depressed step-index core for efficient mode separation. Simulation results show that the fiber can support up to 12 spatial modes with broadband characteristics.
Article
Optics
Pengfei Tian, Weihong Bi, Xiaoyu Wang, Wa Jin, Baojun Zhang, Xinghu Fu, Guangwei Fu
Summary: This paper introduces a new type of long period fiber grating mode converter based on hybrid dual-core fiber, which can convert LP01 mode to LP21 and LP02 with purity up to 98% after conversion.
Article
Engineering, Electrical & Electronic
Luyao Wang, Shuguang Li, Jianshe Li, Xiaojian Meng, Ying Guo, Zenghui Li, Xiaokai Wang, Yan Wang
Summary: A novel superposition-assisted structure (SAS) design is proposed to effectively suppress inter-core crosstalk in few-mode multicore fibers, achieving desired dispersion characteristics and nonlinear effects suppression for fiber communication systems.
OPTICAL FIBER TECHNOLOGY
(2021)
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
Abhishek Mani Shukla, Sumanta Gupta
Summary: To exploit the advantages of multimode fiber (MMF)-based transmission, multichannel transmission with wavelength division multiplexing (WDM) is used to replace single-wavelength transmission of OAM modes. In an experimental study, the successful transmission of two OAM mode groups multiplexed signals jointly with three channels over a 1 km conventional MMF is demonstrated. The achieved bit error rate (BER) is found well below the required pre-FEC BER without using any MIMO-DSP.
IEEE PHOTONICS JOURNAL
(2023)
Article
Optics
Md Selim Habib, Abubakar Adamu, Christos Markos, Rodrigo Amezcua-Correa
Summary: The proposed hollow-core anti-resonant fiber design based on hybrid silica/silicon cladding achieves single-polarization, single-mode, and high birefringence. The optimized design shows low propagation loss and high birefringence for y-polarization, making it suitable for applications in the field of optical fiber communications.
Article
Optics
Xiaofan Ji, Yaping Liu, Honglin Sun, Wenbo Yu, Zhiqun Yang, Lin Zhang
Summary: In this paper, we study the scaling of nonlinear impairment in coupled-core multi-core fibers (CC-MCFs) with different core counts. The results show that increasing the number of cores in CC-MCFs significantly weakens the nonlinear signal degradation, which is of great interest for ultralong-haul transmission. We further analyze the impact of fiber loss, differential group delay, and effective mode field area on this trend. Moreover, we compare CC-MCFs with few-mode fibers with the same number of spatial modes and find that CC-MCFs tend to have better nonlinear performance. It is also shown that few-mode fibers operated in a strong coupling regime are promising for long-haul transmission.
OPTICS COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Haoyang Ren, Yingning Wang, Wenpu Geng, Wenqian Zhao, Runzhou Zhang, Zhongqi Pan, Yang Yue
Summary: This paper presents a design of a multi-ring air-core trench-assisted fiber that supports transmission over the entire C + L band with low inter-ring crosstalk. The effects of the ring spacing, wavelength range, and doping concentration on the crosstalk suppression are systematically investigated. The complexity of the MIMO processing system is greatly reduced with a fewer-optical-core structure while keeping low inter-ring crosstalk.
RESULTS IN PHYSICS
(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
Yuxin Ding, Jianshe Li, Shuguang Li, Yu Qin, Zelin Zhang, Xiaokai Wang, Ying Guo, Xiaojian Meng, Huijing Du
Summary: We propose an elliptical-core mode selective photonic lantern (EC-MSPL) that is suitable for mode division multiplexing (MDM) systems without multiple-input multiple-output (MIMO) capability. By optimizing the taper related parameters in a two-stage approach, we obtain a small package taper region that satisfies the adiabatic condition, enabling a shorter taper length without affecting the performance of the photonic lantern (PL). Simulations show that both step-index and graded-index EC-MSPLs can achieve low-loss mode conversion and crosstalk below -15.6 dB at a wavelength of 1550 nm, with coupling efficiencies above 85% and 71% for the two PL modes in the S+C+L bands.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Svetislav Savovic, Alexandar Djordjevich, Konstantinos Aidinis, Rui Min
Summary: We propose a space division multiplexing technique in a multicore polymer-clad silica fiber, which can achieve higher capacity and longer transmission distance. We also find that the width of the launch beam distribution has a significant impact on the fiber length.
Article
Optics
Guoxuan Zhu, Zhiyong Bai, Jiayan Chen, Churou Huang, Luping Wu, Cailing Fu, Yiping Wang
Summary: The research proposes ultra-dense perfect OAM holography, which discriminates OAM modes radially and angularly, constructing two-dimensional spatial division multiplexed holography and enhancing holography capacity and fidelity.
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
Optics
Shohei Beppu, Koji Igarashi, Masahiro Kikuta, Daiki Soma, Tomoyuki Nagai, Yasuo Saito, Hidenori Takahashi, Takehiro Tsuritani, Itsuro Morita, Masatoshi Suzuki
Article
Computer Science, Hardware & Architecture
C. Manso, R. Munoz, N. Yoshikane, R. Casellas, R. Vilalta, R. Martinez, T. Tsuritani, I Morita
Summary: Network operators are tackling the challenge of increasing network capacity by a factor of 10 while maintaining cost efficiency, with optical disaggregation and SDM being considered key technologies to achieve this goal.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2021)
Article
Computer Science, Hardware & Architecture
Ricard Vilalta, Carlos Manso, Noboru Yoshikane, Ramon Casellas, Ricardo Martinez, Takehiro Tsuritani, Itsuro Morita, Raul Munoz
Summary: This paper presents an experimental evaluation of network protocols for control and management of optical networks and equipment. It introduces YANG data modeling language, multiple data models, telemetry protocols, and a zero-touch SDN controller architecture. The protocol implementations are experimentally evaluated and integration recommendations are provided.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2021)
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
Engineering, Electrical & Electronic
Raul Munoz, Noboru Yoshikane, Ricard Vilalta, Ramon Casellas, Ricardo Martinez, Takehiro Tsuritani, Itsuro Morita
2020 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
S. Beppu, K. Igarashi, H. Mukai, M. Kikuta, M. Shigihara, D. Soma, T. Tsuritani, I Morita
2020 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)
(2020)
Proceedings Paper
Computer Science, Information Systems
Daiki Soma, Shohei Beppu, Hidenori Takahashi, Noboru Yoshikane, Itsuro Morita, Takehiro Tsuritani
2020 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATIONS (ECOC)
(2020)
Proceedings Paper
Computer Science, Information Systems
R. Vilalta, C. Manso, N. Yoshikane, R. Munoz, R. Casellas, R. Martinez, T. Tsuritani, I Morita
2020 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATIONS (ECOC)
(2020)
Proceedings Paper
Computer Science, Information Systems
R. Vilalta, N. Yoshikane, R. Casellas, R. Martinez, T. Tsuritani, I Morita, R. Munoz
2020 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATIONS (ECOC)
(2020)
