Article
Physics, Applied
Yuxin Ding, Jianshe Li, Shuguang Li, Xiaokai Wang, Ying Guo, Xiaojian Meng, Yuanyuan Zhao, Huijing Du
Summary: In this paper, a broadband mode converter based on photonic crystal fiber (PCF) is proposed. Numerical results show that this mode converter has high mode coupling efficiency and mode extinction ratio, and it can realize cascade multiplexing. Additionally, a multi-core mode multiplexer structure is proposed, which allows the simultaneous reuse of three modes.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
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
Engineering, Electrical & Electronic
Han Wang, Takeshi Fujisawa, Takanori Sato, Masaki Wada, Takayoshi Mori, Taiji Sakamoto, Ryota Imada, Takashi Matsui, Kazuhide Nakajima, Kunimasa Saitoh
Summary: In this paper, two PLC tapered structures are proposed, which enable mode conversions in different scenarios using fast quasiadiabatic dynamics. The lengths of the converters are significantly reduced compared to previous structures, while maintaining high conversion efficiency.
IEICE ELECTRONICS EXPRESS
(2023)
Article
Optics
Han Wang, Takeshi Fujisawa, Takanori Sato, Takayoshi Mori, Taiji Sakamoto, Yoko Yamashita, Ryota Imada, Kazuhide Nakajima, Kunimasa Saitoh
Summary: We propose 6-mode and 10-mode photonic lantern mode multiplexers based on two-and three-layer silica planar lightwave circuitry, respectively. The 6-mode multiplexer achieves transmission greater than -0.19 dB at a wavelength of 1550 nm for six different modes. The 10-mode multiplexer is designed to excite selected modes and achieves transmission greater than -1.15 dB at a wavelength of 1550 nm.
OPTICS COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Jingxuan Yang, Hu Zhang, Xiaoguang Zhang, Ze Chen, Lixia Xi, Wenbo Zhang
Summary: The study presents a method for generating orbital angular momentum modes using an all-fiber coupler, achieving high coupling efficiency and mode purity for broadband operation through optimized parameters. By adjusting the center-to-center distance and coupling length, efficient coupling of OAM modes can be achieved in the C+L band.
OPTICAL FIBER TECHNOLOGY
(2021)
Article
Optics
Neethu Mariam Mathew, Lars Gruner-Nielsen, Mads Lillieholm, Michael Galili, Karsten Rottwitt
Summary: This paper presents the fabrication steps for an air-clad photonic lantern that can excite the first two LP mode groups in a multimode fiber. Experimental results show excellent performance of the fabricated lantern in terms of multiplexing crosstalk, demultiplexing crosstalk, and MDM transmission.
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
Optics
Jian Cui, Yuyang Gao, Yu Yang, Dawei Ge, Yongqi He, Zhangyuan Chen, Juhao Li
Summary: This paper proposes a highly mode-selective PL-MMUX/MDEMUX design for intensity-modulation/direct-detection MDM transmission. By adopting non-degenerate modes or pairs of degenerate modes as independent channels and utilizing differential-phase injection (DPI) scheme and dissimilar core arrangement method, a very high modal selectivity is achieved.
OPTICS COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Yongze Liang, Guorui Wang, Jiwei Zhang, Han Zhang, Enwang Liang, Fang Wang, Xuenan Zhang, Xin Yan, Tonglei Cheng
Summary: In this study, an all-optical fiber-based mode converter was created by combining a self-made 5-mode fiber with a single mode fiber using the fused tapering approach. By controlling the core size, high-efficiency mode conversions were achieved between the fundamental mode in the single mode fiber and the five modes in the 5-mode fiber. Additionally, a 5-mode-division multiplexer was produced by cascading the mode converters, providing a convenient and effective option for constructing high-capacity mode division multiplexing communication systems.
OPTICAL FIBER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Mengyuan Ye, Weilun Zhang, Yunlong Li, Li Liu, Xiangyu Guo, Yu Yu
Summary: This study proposes and demonstrates a silicon-based dual-mode fiber-chip edge coupler, which achieves efficient mode coupling with low loss, low crosstalk, and compact footprint. The experimental results confirm the performance and feasibility of the proposed coupler.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Optics
Jiangbing Du, Weihong Shen, Jiacheng Liu, Yufeng Chen, Xinyi Chen, Zuyuan He
Summary: This tutorial discusses the use of FMF for MDM to overcome the capacity bottleneck of optical communications, highlighting the importance and prospects of MDM in photonic integration and optical fiber transmission. It also addresses the research and application challenges of MDM in long-haul transmission and short reach interconnection.
CHINESE OPTICS LETTERS
(2021)
Article
Multidisciplinary Sciences
Svetislav Savovic, Konstantinos Aidinis, Alexandar Djordjevich, Rui Min
Summary: The feasible distance for space division multiplexed transmission in multimode silica step-index photonic crystal fiber (SI PCF) is determined by solving the time-independent power flow equation. These distances depend on mode coupling, fiber structural parameters, and launch beam width to control crosstalk below 20% of the peak signal strength in two- and three-channel modulation. The length of the fiber required for SDM increases with larger air-hole sizes in the cladding (higher NA), while wider launch beams result in shorter distances. This knowledge is valuable for communication using multimode silica SI PCFs.
Article
Engineering, Electrical & Electronic
Ryota Tanomura, Rui Tang, Go Soma, Shota Ishimura, Takuo Tanemura, Yoshiaki Nakano
Summary: This article introduces a 6-port dual-polarization (DP) optical unitary processor (OUP) with polarization-splitter-rotators, implemented on a compact silicon photonic chip based on the multi-plane light conversion (MPLC) concept. It demonstrates all-optical MIMO demultiplexing of a 300-Gbps 3-mode DP quadrature phase-shift-keying (QPSK) signal at 1540, 1550, and 1560-nm wavelengths with an energy consumption of approximately 1.5 pJ/bit. All-optical MIMO is transparent to signal format and the energy cost decreases with increasing baudrate, making it an attractive approach for reducing power consumption in future ultra-high-capacity MDM systems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Wei Wei, Hongyang Zhao, Yitong Wang, Ziming Dong, Liqin Tang, Lei Ding, Yigang Li
Summary: We propose a photonic quasi-crystal fiber with five ring-shaped cores that achieves the multiplexing of 6 vortex modes. The fiber has an octuple photonic quasi-crystal structure based on SiO2 and four independent dual-core coupling pairs. By adjusting the thickness of the ring-shaped cores, the light field transfers from small side cores to a large center core, realizing the multiplexing of 6 vortex modes. The design shows great potential in the field of all-fiber vortex mode division multiplexing.
IEEE PHOTONICS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Han Zhang, Guorui Wang, Jiwei Zhang, Fang Wang, Xin Yan, Xuenan Zhang, Tonglei Cheng
Summary: In this study, a novel NA-PCF was proposed and designed for MCF communication systems, utilizing nanorods and air-holes to suppress crosstalk between fiber cores. Simulation results demonstrated that the NA-PCF has potential applications in large-capacity long-distance MCF communication.
IEEE PHOTONICS JOURNAL
(2021)
