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Improved optical coupling based on a concave cavity lens fabricated by optical fiber facet etching

Chinese Optics Letters 2021年第5期19卷 12-18页

作者： Kanglin Li Jiangbing Du Weihong Shen Jiacheng Liu Zuyuan He State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China

We report a low-fabrication-complexity and wideband fiber lens,which is formed by fiber facet etching and filling high refractive index UV *** optical field can be significantly shrunk by the facet lens so as to obtain improved optical *** simulations were carried out for different coupling conditions,on both fundamental mode and highorder mode,for a nine-mode *** fundamental mode area can be reduced from 152.17 to 12.57μm^(~2),and the coupling loss between the fiber lens and a photonic waveguide can be reduced to-2.9 d B with over 1000 nm 3 d B bandwidth.

关键词： fiber lens optical coupling

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Review on Speckle-Based Spectrum Analyzer

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Photonic Sensors 2021年第2期11卷 187-202页

作者： Yangyang WAN Xinyu FAN Zuyuan HE State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China

Accurate spectral measurement and wavelength determination are fundamental and vital for many fields.A compact spectrum analyzer with high performance is expected to meet the growing requirements,and speckle-based spectrum analyzer is a potential *** basic principle is based on using the random medium to establish a speckle-to-wavelength mapping relationship for spectrum *** article introduces current speckle-based spectrum analyzers with different schemes and reviews recent advances in this ***,some applications by using speckle-based spectrum analyzers are also ***,the existing challenges and the future prospects of using speckle for spectrum recovery are discussed.

关键词： Speckle spectrum analyzer random medium spectroscopy

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Estimation of Kerr Nonlinearity in an Anti-resonant Hollow-Core Fiber by High-order QAM Transmission

Estimation of Kerr Nonlinearity in an Anti-resonant Hollow-C...

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2023 optical Fiber communications Conference and Exhibition, OFC 2023

作者： Ge, Dawei Gao, Shoufei Zuo, Mingqing Gao, Yuyang Wang, Yinging Yan, Baoluo Ye, Bing Zhang, Dechao Ding, Wei Li, Han Chen, Zhangyuan China Mobile Research Institute Department of Fundamental Network Technology Beijing100053 China Jinan University Institute of Photonics Technology 510632 China Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks Beijing100871 China Zte Corporation Hebei065201 China

We propose a novel technique to measure Kerr nonlinearity in a hollow-core fiber based on nonlinear phase shift estimation by high-order QAM transmission. The measured n2,Kerr of the NANF-5 medium is © 2023 The A... 详细信息

ISBN: (纸本)9781957171180

关键词： Quadrature amplitude modulation

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Efficient FPGA Implementation of Syndrome-Assisted Layered Belief Propagation Decoder for CV-QKD systems

Efficient FPGA Implementation of Syndrome-Assisted Layered B...

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communication, Image and Signal Processing (CCISP), International Conference on

作者： Yong Chen Xue-Qin Jiang Genlong Chen Peng Huang Enjian Bai Han Hai School of Information Science and Technology Donghua University Shanghai China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China

ISBN: (数字)9798350356656

ISBN: (纸本)9798350356663

In this paper, we propose a QC-LDPC decoder architecture with low complexity as well as excellent decoding performance in CV-QKD systems, which employs the syndrome-assisted layered belief propagation decoding algorithm. To minimize the complexity of hardware implementation and resource consumption in iterative decoding, we use fixed-point numbers instead of floating-point numbers to update node messages. Additionally, two-segment nonuniform lookup tables are employed to implement $\psi(x)$ efficiently. Besides, the layered syndrome-assisted early termination (LS-ET) scheme is introduced, resulting in the reduction of the number of decoding iterations while maintaining superior frame error rate (FER) performance. The experimental results indicate that the QC-LDPC decoder implemented on an FPGA is capable of achieving throughput of 50.8 Mbps when the code length is 26112 and code rate is 22/68.

关键词： Performance evaluation Codes Signal processing algorithms Throughput Decoding Complexity theory Table lookup Iterative decoding Field programmable gate arrays Belief propagation

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Design and Development of a Fourth Harmonic Terahertz Gyrotron Based on Axis-Encircling Electron Beam

Design and Development of a Fourth Harmonic Terahertz Gyrotr...

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IEEE International Conference on Plasma Science (ICOPS)

作者： F. Zhang C. Du J. Yang School of Electronics Peking University Beijing China Center for Carbon-based Electronics and State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing China

ISBN: (数字)9798350360912

ISBN: (纸本)9798350360929

In this paper, a terahertz Gyrotron oscillator based on axis-encircling electron beam is proposed. The coaxial electron gun is designed and optimized, which can produce an electron beam with $80 \mathrm{kV}, 1 \mathrm{~A}$ and fixed pitch factor of 1.5 under ultra-high compression ratios of 1500-3800 and provides a foundation for the design and development of continuous-wave terahertz harmonic gyrotron. Then, a gyrotron interaction scheme based on the fourth harmonic TE 48 mode is proposed. Through careful optimization of cavity structure, efficient single-mode excitation of the fourth harmonic mode TE 48 can be achieved at 879 GHz, and a peak power of 1208 W and an efficiency of $1.51 \%$ can be obtained with magnetic tuning. By adjusting the working magnetic field to balance mode competition, the proposed scheme can sequentially excite six different harmonic modes within the range of 6.01-9.16T, including the fundamental TE 12 mode, second harmonic TE 23 and TE 24 modes, third harmonic TE 35 and TE 36 modes, and the fourth harmonic TE 48 mode, which achieves ultra-wideband tuning across harmonic modes. The output power can reach up to 16.82 kW, and the output frequency can be discretely tuned from 0.162 THz to 0.879 THz while maintaining instantaneous single-mode operation during tuning. Finally, based on the above designs, a terahertz gyrotron processing scheme is proposed and an experimental platform is established, which completes the systematic testing of the tube. During actual testing, to protect the cathode and extend its service life, the electron gun operates at low voltage (50 kV) and low current (300 mA). A fundamental mode with 3.57 kW peak power and 162.5 GHz frequency is obtained. The experimental results mark the successful development of terahertz gyrotrons with the coaxial cyclotron electron beam.

关键词： systematics Electron beams Gyrotrons Power system harmonics Harmonic analysis Electron guns Tuning

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Nonblocking Conditions for Flex-grid OXC-Clos networks

Nonblocking Conditions for Flex-grid OXC-Clos Networks

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IEEE Annual Joint Conference: INFOCOM, IEEE Computer and communications Societies

作者： Yibei Yao Tong Ye Ning Deng State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China Huawei Technologies Co. Ltd. Shenzhen China

ISBN: (数字)9798350383508

ISBN: (纸本)9798350383515

The emerging high-capacity optical networks makes it urgent to design large-scale flexible mesh optical cross-connects (OXCs). Though Clos network is the theory for building scalable and cost-effective switching fabrics, the nonblocking conditions of flex-grid optical Clos networks without wavelength conversion remain unknown. This paper studies the nonblocking conditions for the flex-grid OXC-Clos network, which is constructed from a number of small-size standard OXCs. We first show that a strictly nonblocking (SNB) OXC-Clos network will incur a high cost, as small-granularity lightpaths may abuse central modules, rendering them unavailable for large-granularity requests due to frequency conflicts. We thus propose a granularity differential routing (GDR) strategy, the idea of which is to restrict the set of CMs that can be used by the lightpaths of each granularity. Under the GDR strategy, we investigate two system models, granularity-port binding and unbinding models, and prove the wide-sense nonblocking (WSNB) conditions for OXC-Clos network. We show that the cost of WSNB network is remarkably smaller than that of SNB network, and find that the second model can lead to more flexible network-bandwidth utilization than the first model only at a small cost of switching fabrics.

关键词： Wireless sensor networks Costs Computational modeling optical switches optical wavelength conversion optical fiber networks Routing

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Design of Low-chromatic-dispersion Weakly-coupled Few Mode Fiber 19

Design of Low-chromatic-dispersion Weakly-coupled Few Mode F...

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19th International Conference on optical communications and networks, ICOCN 2021

作者： He, Qichen Li, Yao Gao, Fei Zuo, Mingqing Cao, Haotian Gao, Yuyang He, Yongqi Chen, Zhangyuan Li, Juhao State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics Peking University Beijing China China Shipbuilding System Engineering Research Institute Beijing China

We propose a low-chromatic-dispersion (CD) weakly-coupled FMF design method based on perturbation theory. 4-mode and 7-mode weakly-coupled FMFs with CD coefficients ranging from -8 to +8 ps/km/nm are designed. © ... 详细信息

ISBN: (纸本)9781665424462

关键词： Chromatic dispersion

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Ultralow-Loss Micro-Transfer Printed Thin-Film Lithium Niobate on Silicon Nitride Coupler

Ultralow-Loss Micro-Transfer Printed Thin-Film Lithium Nioba...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Jinwei Su Minglu Cai Zekun Cui Liangjun Lu Kan Wu Jianping Chen Linjie Zhou State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China SJTU-Pinghu Institute of Intelligent-Optoelectronics Pinghu Zhejiang China

An efficient and large-tolerance (± 1.5 μm) coupler based on the micro-transfer printed thin-film lithium niobate on a silicon nitride platform is demonstrated with insertion loss of~0.1 dB/facet within a 100 nm... 详细信息

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379273

关键词： Couplings optical losses Lithium niobate Multichip modules Silicon nitride Couplers Lithium optical fiber communication optical waveguides Photonics

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Narrowband Fast-Tunable Microring Filter Based on Micro-Transfer Printed Thin-Film Lithium Niobate on Silicon Nitride

Narrowband Fast-Tunable Microring Filter Based on Micro-Tran...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Jinwei Su Wei Gao Zekun Cui Liangjun Lu Kan Wu Jianping Chen Linjie Zhou State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China SJTU-Pinghu Institute of Intelligent-Optoelectronics Pinghu Zhejiang China

We demonstrate a fast-tunable microring filter using micro-transfer printing of a racetrack-shaped thin-film lithium niobate on the silicon nitride platform, achieving a loaded Q-factor exceeding 10 5 and a response t... 详细信息

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379273

关键词： optical filters Q-factor Printing Spirals Lithium niobate Silicon nitride Signal processing Time factors Microwave filters Narrowband

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Polarization-Insensitive optical Switch Fabrics and the key Components on the 220-nm SOI Platform

Polarization-Insensitive Optical Switch Fabrics and the Key ...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Wei Gao Liangjun Lu Jinwei Su Xin Li Jianping Chen Linjie Zhou State Key Laboratory of-Advanced Optical Communication-Systems and Networks Shanghai Jiao Tong University Shanghai China SJTU-Pinghu Institute of Intelligent-Optoelectronics Pinghu Zhejiang China

We propose innovative polarization-insensitive optical switch fabrics on the 220-nm SOI platform, featuring polarization-insensitive switch elements, polarization-insensitive waveguide crossings, and $\mathbf{TE}_optical-... 详细信息

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379273

关键词： Phased arrays Semiconductor device measurement optical switches Wavelength measurement Couplers optical waveguide components Loss measurement Fabrics Arrays Photonics

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