Article
Engineering, Electrical & Electronic
Xuetong Zhou, Hon Ki Tsang
Summary: This paper describes a novel high coupling efficiency multimode waveguide grating coupler that utilizes a polysilicon overlay to optimize the directivity and mode-matching for different modes. Experimental results show significant improvement over previous designs and suggest potential applications in silicon photonic transceivers for mode-division multiplexed communications in multimode fibers.
IEEE PHOTONICS JOURNAL
(2022)
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
Engineering, Electrical & Electronic
Weifeng Jiang, Jinzhu Hu, Siqiang Mao, Hanyu Zhang, Linjie Zhou, B. M. Azizur Rahman
Summary: This study proposes a novel broadband silicon four-mode (de)multiplexer that can (de)multiplex TE0, TE1, TE2, and TE3 modes using subwavelength gratings-assisted triple-waveguide couplers. Experimental results show high bandwidth and low insertion loss, making it suitable for increasing the transmission capacity of on-chip optical interconnects.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
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
Chemistry, Multidisciplinary
Yaping Liu, Zhiqun Yang, Xutao Wang, Yongmin Jung, Lin Zhang
Summary: This paper proposes a new design for few-mode erbium-doped fiber amplifiers (FM-EDFAs) that achieves significantly reduced differential modal gain (DMG) through strong mode coupling. A new numerical model based on a fiber transfer matrix is used to systematically investigate the DMGs of FM-EDFAs and analyze two different types of six-mode fiber amplifiers as exemplar demonstrations.
APPLIED SCIENCES-BASEL
(2022)
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
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)
Article
Optics
Pavel S. Anisimov, Evgeny D. Tsyplakov, Viacheslav V. Zemlyakov, Jiexing Gao
Summary: We present an alternative method for compensating intermodal interactions in few-mode optical fibers using digital backpropagation. Instead of solving the inverse generalized multimode nonlinear Schrodinger equation, we utilize a deep neural network to backpropagate multimode signals based on their near-field intensity distributions captured by a camera. We demonstrate the feasibility of this approach by training an autoencoder for backpropagation of six linearly polarized modes in a step-index fiber.
CHINESE OPTICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Yuxuan Chen, Simon Levasseur, Leslie A. Rusch, Wei Shi
Summary: In this research, an optical phased array (OPA) with two-dimensional antennas is used to generate circularly polarized OAM beams. The OAM multiplexer supports up to 46 simultaneous spatial modes and incorporates intensity tuning capability to improve the OAM quality and reduce crosstalk.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Rabiu Imam Sabitu, Nafizah Goriman Khan, Amin Malekmohammadi
Summary: This paper reports on mode conversion using tilted few-mode fiber assisted by dual arc waveguide. A multilayer core multimode fiber is used for modeling the device. The optimized device achieves high efficiency conversions between different modes, making it suitable for mode-division multiplexing communication.
Article
Chemistry, Physical
Guoli Li, Fei Feng, Fang Wang, Bo Wei
Summary: Studying the temperature field of photovoltaic modules is crucial for improving their power generation efficiency. To address the issue of traditional sensors being unsuitable for measuring the spatial temperature field, researchers have proposed a real-time detection scheme based on a fiber Bragg grating (FBG) sensor array. This scheme utilizes wavelength division multiplexing and space division multiplexing technologies. Experimental results demonstrated that the temperature fluctuation of the photovoltaic module surface and near-field is consistent with the solar radiation power. The temperature of the module decays from the surface to space, with a rapid drop within 6 mm of the module surface. The temperature decay rate is faster with lower solar radiation power and higher wind speed. This method provides technical support for measuring the temperature field of photovoltaic modules and other heat source equipment.
Article
Nanoscience & Nanotechnology
Jaewon Oh, Kangmei Li, Jun Yang, Wei Ting Chen, Ming-Jun Li, Paulo Dainese, Federico Capasso
Summary: This study introduces a mode-division multiplexer and demultiplexer design based on a metasurface cavity, which can perform mode conversion and coupling to fibers on a single surface without the need for additional optics. The converted modes have high fidelity due to the optimized phase profile of the metasurface.
Review
Optics
Svetlana Nikolaevna Khonina, Nikolay Lvovich Kazanskiy, Muhammad Ali Butt, Sergei Vladimirovich Karpeev
Summary: This review presents an attention-grabbing and up-to-date overview of major multiplexing techniques, including wavelength division multiplexing, polarization division multiplexing, space division multiplexing, mode division multiplexing, and orbital angular momentum multiplexing. It also discusses hybrid multiplexing methods and techniques. This unique review paper highlights the most prominent and recent progress in multiplexing techniques in one place.
OPTO-ELECTRONIC ADVANCES
(2022)
Article
Engineering, Electrical & Electronic
Yingjuan Ci, Fang Ren, Xiao Lei, Yanfei Zhang, Xiaohui Wang, Jianping Wang
Summary: We propose a weakly-coupled air-hole-bow-tie-assisted few-mode fiber (AH-BT-FMF) that supports 26 eigenmodes across the C + L band for short-haul communication systems. By introducing an elliptical core, air holes, and a bow-tie stress-applying area, we effectively split adjacent eigenmodes. We evaluate the fiber's parameters and investigate its broadband performance, including the effective refractive index difference, differential mode delay, dispersion, and effective area.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Jian Cui, Yuyang Gao, Shuailuo Huang, Jinyi Yu, Jiaxin Liu, Junchi Jia, Yongqi He, Zhangyuan Chen, Juhao Li
Summary: In this paper, a design method for degenerate-mode-selective couplers (DMSC) with side-polishing processing is proposed, and three kinds of DMSCs for different linearly-polarized (LP) modes (LP11, LP21, and LP31) in a weakly-coupled few-mode fiber (FMF) are designed. A pair of mode multiplexers/demultiplexers (MMUX/MDEMUX) consisting of cascaded mode-selective couplers (MSC) and DMSCs for all the 5 LP modes of the FMF are fabricated with side-polishing processing. The measurement results show that the MMUX and MDEMUX achieve low back-to-back insertion loss (IL) lower than 5.3 dB for all the 5 modes. Stable digital-signal-processing (DSP)-free 5-mode intensity modulation and direct detection (IM/DD) mode division multiplexing (MDM) transmission over a 10-km FMF is successfully demonstrated.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Peicheng Liao, Changjing Bao, Ahmed Almaiman, Arne Kordts, Maxim Karpov, Martin Hubert Peter Pfeiffer, Lin Zhang, Fatemeh Alishahi, Yinwen Cao, Kaiheng Zou, Ahmad Fallahpour, Ari N. Willner, Moshe Tur, Tobias J. Kippenberg, Alan E. Willner
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2019)
Correction
Engineering, Electrical & Electronic
Meng Zhang, Henan Liu, Bing Wang, Guifang Li, Lin Zhang
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2019)
Article
Engineering, Electrical & Electronic
Lijuan Xu, Minghui Yang, Yuhao Guo, Henan Liu, Guifang Li, Lin Zhang
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2019)
Article
Engineering, Electrical & Electronic
Yuxi Fang, Changjing Bao, Zhi Wang, Bo Liu, Lin Zhang, Xu Han, Yuxuan He, Hao Huang, Yongxiong Ren, Zhongqi Pan, Yang Yue
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2020)
Article
Engineering, Electrical & Electronic
Xin Tong, Henan Liu, Guifang Li, Lin Zhang
Summary: The study introduces an integrated waveguide optical tweezer design that achieves focusing of upward radiation through etched trenches on a waveguide. Optimization of the antenna's structural parameters generates a quasi-Gaussian field distribution above the antenna. The gradient distribution of the electric field produces gradient force, enabling effective optical trapping of microscale particles.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Xin Tong, Hao Tian, Yongjun Guo, Meng Zhang, Lin Zhang
Summary: The study introduces a method of integrating nanophotonic traps in a microfluidic channel, utilizing a slot waveguide and nano-slit to generate strong optical forces for trapping nanoparticles, forming a large array of optical traps expected for application in biological nanoparticle research.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Yaping Liu, Yongmin Jung, Zhiqun Yang, Lin Zhang, David J. Richardson
Summary: A new type of all-fiber mode scrambler is proposed for mode division multiplexed data transmission based on few mode fibers, achieving low loss and wideband mode coupling by randomly placing multiple point-loads along the fiber length. An exemplar experimental demonstration with 150 randomly located point-loads in step-index two mode fibers shows uniform mode coupling over the C band with an insertion loss of less than 1 dB.
IEEE PHOTONICS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Zhongjing Hu, Lijuan Xu, Jing Wang, Yuke Zhai, Lin Zhang
Summary: This study demonstrated supercontinuum generation in a dispersion-engineered silicon nitride waveguide pumped with 10ps pulses at 1550 nm wavelength, resulting in a spectrum from 656 to 3867 nm with power variation <15 dB and a very flat pedestal with <5 dB variation. The research highlights the unique role of dispersion tailoring in achieving a broad and flat supercontinuum generation, making it highly desirable for various applications.
IEEE JOURNAL OF QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Zhi Cheng, Xin Tong, Lin Zhang
Summary: Near-field optical tweezers integrated on a chip are gaining attention for biological and chemical analyses. A low-loss Si waveguide with a high intensity gradient in the electric field is proposed for trapping microparticles. The device has high transmittance and the ability to analyze optical forces in all three dimensions.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Weicheng Chen, Rongxiang Guo, Dian Wan, Tarun Sharma, Lin Zhang, Tiegen Liu, Zhenzhou Cheng
Summary: On-chip Kerr frequency combs provide unprecedented opportunities for optical communications and optical interconnects with compact, low-cost, and high-density wavelength-division multiplexing (WDM) techniques. A dual-mode Kerr frequency comb based on a graphene-on-silicon (GOS) microring is proposed to overcome the limitation of traditional approaches and achieve high-speed optical communications.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Xiushan Du, Yuke Zhai, Leonardo Midolo, Lin Zhang, Xiaoyan Zhou
Summary: This paper proposes a method for efficient frequency conversion using a nanomechanical silicon-rich nitride waveguide device, to address the frequency conversion challenge in on-demand single-photon sources. Numerical results show that optimal conversion efficiency over 99% and high signal-to-noise ratio can be achieved when the waveguide loss is negligible.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Wenpu Geng, Yuxi Fang, Yingning Wang, Zhi Wang, Yan-ge Liu, Lin Zhang, Changjing Bao, Yongxiong Ren, Zhongqi Pan, Yang Yue
Summary: In this study, a dual concentric-ring-core fiber design was proposed to achieve near-zero and flat dispersion profiles over a 3007-nm wavelength range with four zero-dispersion wavelengths for the OAM mode. The precise position of the zero-dispersion wavelengths can be tailored by varying the structural variables and the germanium-doped concentration of the silica-based fiber. Simulation results showed that by pumping a 50-fs 600-kW Gaussian pulse at the central wavelength of 1900 nm into a 2-mm designed fiber, the OAM(3,1) mode supercontinuum spectrum can achieve beyond three-octave spanning from 445 to 3942 nm at -40 dB level. By further optimizing the proposed fiber structure for the OAM(1,1) mode with <60 ps/(nm.km) dispersion variation over a 3210-nm bandwidth, the generated supercontinuum can cover nearly three octaves.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Rui Duan, Yi Tian Thung, Zitong Zhang, Emek Goksu Durmusoglu, Yichen He, Lian Xiao, Calvin Xiu Xian Lee, Wen Siang Lew, Lin Zhang, Hanyang Li, Jun Yang, Hilmi Volkan Demir, Handong Sun
Summary: Soft matter-based microlasers, with their flexibility and functional network topology, are considered as excellent building blocks for photonic interconnected networks. However, challenges like poor lasing stability and high lasing threshold hinder their potential. In this study, a high-quality, low-threshold nanoplatelets-based polymer microfiber laser and its photonic interconnected networks are successfully demonstrated. The work pioneers the exploration of polygonal self-coupling microlasers and provides insights for unit design and programming in future photonic network systems.
LASER & PHOTONICS REVIEWS
(2023)
Article
Computer Science, Information Systems
Lijuan Xu, Yuhao Guo, Jing Wang, Zhaohong Han, Henan Liu, Jurgen Michel, Lionel C. Kimerling, Lin Zhang
Summary: This paper proposes a new type of athermal waveguide composed of TiO2 with a negative TOC and SiC with a positive TOC, which maintains near-zero TOC over a broad bandwidth and low anomalous dispersion. The waveguide structure is suitable for microresonators and can be bent tightly without experiencing significant losses.
Article
Computer Science, Information Systems
Yuxi Fang, Changjing Bao, Zhi Wang, Yange Liu, Lin Zhang, Si-Ao Li, Yiwen Zhang, Hao Huang, Yongxiong Ren, Zhongqi Pan, Yang Yue
