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Low-modal-crosstalk doped-fiber amplifiers in few-mode-fiber-based systems

Photonics Research 2024年第8期12卷 1768-1775页

作者： SHUAILUO HUANG LEI SHEN GANG QIAO YUANPENG DING YUYANG GAO JIAN CUI BAOLONG ZHU SIYUAN LIU MINGQING ZUO JINGLONG ZHU LEI ZHANG JIE LUO YONGQI HE zhangyuan chen JUHAO LI State Key Laboratory of Advanced Optical Communication Systems and Networks Peking UniversityBeijing 100871China State Key Laboratory of Optical Fiber and Cable Manufacture Technology Yangtze Optical Fibre and Cable Joint Stock Limited CompanyWuhan 430073China School of Computer and Communication Engineering University of Science and Technology BeijingBeijing 100083China Department of Networks China Mobile Communications Group Co.Ltd.Beijing 100033China Department of Fundamental Network Technology China Mobile Research InstituteBeijing 100053China Pengcheng Laboratory Shenzhen 518055China

Independent light propagation through one or multiple modes is commonly considered as a basic demand for mode manipulation in few-mode fiber(FMF)-or multimode fiber(MMF)-based optical systems such as transmission links,optical fiber lasers,or distributed optical fiber ***,the insertion of doped-fiber amplifiers always kills the entire effort by inducing significant modal *** this paper,we propose the design of doped-fiber amplifiers in FMF-based systems adopting identical multiple-ring-core(MRC)index profiles for both passive and doped fibers to achieve low modal *** develop the direct-glass-transition(DGT)modified chemical vapor deposition(MCVD)processing for precise fabrication of few-mode erbium-doped fibers(FM-EDFs)with MRC profiles of both refractive index and erbium-ion doping ***,a few-mode erbium-doped-fiber amplifier(FM-EDFA)with a maximum gain of 26.08 dB and differential modal gain(DMG)of 2.3 dB is realized based on fabricated FM-EDF matched with a transmission FMF supporting four linearly polarized(LP)*** the insertion of the FM-EDFA,60+60 km simultaneous LP_(01)∕LP_(11)∕LP_(21)∕LP_(02)transmission without inter-modal multiple-input multiple-output digital signal processing(MIMO-DSP)is successfully *** proposed design of low-modal-crosstalk doped-fiber amplifiers provides,to our knowledge,new insights into mode manipulation methods in various applications.

关键词： fiber crosstalk amplifiers

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3DPF-FBN: video inpainting by jointly 3D-patch filling and neural network refinement

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Science China(Information Sciences) 2022年第7期65卷 251-252页

作者： Yan HUANG Chuanchuan YANG zhangyuan chen State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics Peking University

Dear editor, Video inpainting is a new technology of recovering the lost motion vectors or image blocks during the video sequence transmission. It aims to speculate the correct value of missing voxels from a given video to achieve the automatic inpainting and make the inpainted video frames present a natural visual effect. However, video inpainting remains challenging owing to the difficulties coming from computational complexity, complex scenarios and the high requirement on spatial and temporal consistency.

关键词： video inpainting patch-based searching optical flow neural network refinement

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Weakly-coupled mode division multiplexing over conventional multi-mode fiber with intensity modulation and direct detection

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Frontiers of Optoelectronics 2019年第1期12卷 31-40页

作者： Juhao LI Zhongying WU Dawei GE Jinglong ZHU Yu TIAN Yichi ZHANG Jinyi YU Zhengbin LI zhangyuan chen Yongqi HE State Key Laboratory of Advanced Optical Communication Systems and Networks Peking UniversityBeijing 100871China Wuhan Research Institute of Posts and Telecommunications Wuhan 430074China

Multi-mode fiber(MMF)links are expected to greatly enhance capacity to cope with rapidly increasing data traffic in optical short-reach systems and ***,mode division multiplexing(MDM)over MMF has been proposed,in which different modes in MMF are utilized as spatial channels for data *** MDM techniques utilizing coherent detection and multiplex-input-multiplex-output(MIMO)digital signal processing(DSP)are complex and expensive for shortreach *** the weakly-coupled approach by significantly suppressing mode coupling in the fiber and optical components has been *** this way,the signals in each mode can be independently transmitted and received using conventional intensity modulation and direct detection(IM-DD).In this paper,we elaborate the key technologies to realize weakly-coupled MDM transmission over conventional MMF,including mode characteristic in MMF and weakly-coupled mode multiplexer/ demultiplexer(MUX/DEMUX).We also present the upto-date experimental results for weakly-coupled MDM transmission over conventional OM3 *** show that weakly-coupled MDM scheme is promising for high-speed optical interconnections and bandwidth upgrade of already-deployed MMF links.

关键词： multi-mode fiber (MMF) mode division multiplexing (MDM) weak mode coupling intensity modulation and direct detection (IM-DD)

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Theory Analysis of the Handover Challenge in Express Train Access Networks （ETAN）

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China Communications 2014年第7期11卷 92-98页

作者： HU Guoqing HUANG Anpeng HE Ruisi AI Bo chen zhangyuan State Key Lab of Advanced Optical Communication Systems and Networks Peking University Beijing 100871 P. R. China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing 100044 E R. China

To handle the handover challenge in Express Train Access Networks(ETAN).mobility fading effects in high speed railway environments should be addressed *** on the investigation of fading effects in this paper,we obtain two theoretical bounds:HOTiming upper bound and HO-Margin lower bound,which are helpful guidelines to study the handover challenge today and in the ***,we apply them to analyze performance of conventional handover technologies and our proposal in *** follow-up theory analyses and simulation experiment results demonstrate that the proposed handover solution can minimize handover time up to 4ms(which is the fastest one so far),and reduce HO-Margin to 0.16 dB at a train speed of 350km/h.

关键词： express train access network handover (HO) high speed railways HO-timing upper bound HO-margin lower bound

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A Novel All-optical Wavelength ConverterBased on Self-pump Four-wave Mixing

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Chinese Journal of Lasers 2002年第2期11卷 61-65页

作者： chen Jianxiao chen zhangyuan TAO Zhenning WU DemingXU Anshi WANG Ziyu(National Laboratory on Local Optic-Fiber Communication Networks &Advanced Optical Communication Systems, Department of Electronics,Peking University, Beijing 100871, China) Department of Electronics Peking University National Laboratory on Local Optic-Fiber Communication Networks & Advanced Optical Communication Systems 北京 100871

A novel scheme of all-optical wavelength converter(AOWC) based on dual pump four-wave mixing(DP-FWM) was demonstrated. To suppress the ASE noise of the semiconductor optical amplifier (SOA), one of the two pumps was generated interiorly from a loop laser constructed mainly by tunable optical filter and SOA. The theoretical model and some experimental results were presented.

关键词： wavelength conversion four-wave mixing semiconductor optical amplifier self pump

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Monolithic thin film lithium niobate electro-optic modulator with over 110 GHz bandwidth

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Chinese Optics Letters 2022年第2期20卷 148-152页

作者： Fan Yang Xiansong Fang Xinyu chen Lixin Zhu Fan Zhang zhangyuan chen Yanping Li State Key Laboratory of Advanced Optical Communication Systems and Networks Department of ElectronicsPeking UniversityBeijing 100871China Frontiers Science Center for Nano-optoelectronics Peking UniversityBeijing 100871China

High-performance thin film lithium niobate(LN) electro-optic modulators with low cost are in demand. Based on photolithography and wet etching, we experimentally demonstrate a thin film LN Mach–Zehnder modulator with a 3 d B bandwidth exceeding 110 GHz, which shows the potential of boosting the throughput and reducing cost. The fabricated modulator also exhibits a comparable low half-wave voltage-length product of ~2.37 V · cm, a high extinction ratio of >23 d B, and the propagation loss of optical waveguides of ~0.2 d B/cm. Besides, six-level pulse amplitude modulation up to 250 Gb/s is successfully achieved.

关键词： lithium niobate electro-optic modulator high bandwidth photolithography wet etching

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自觉加强党性修养永葆共产党人先进性

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军队政工理论研究 2005年第3期6卷 13-16页

作者：陈章元济南军区山东济南250002

自觉加强党性修养,是新形势下保持共产党员先进性的必然要求和必由之路。要注重贯彻理论和实践相结合的原则,突出四个重点,充分发挥主观能动性,引导广大党员着眼履行军队神圣使命,紧密联系思想和本职岗位实际,自觉把开展先进性教育的过... 详细信息

自觉加强党性修养,是新形势下保持共产党员先进性的必然要求和必由之路。要注重贯彻理论和实践相结合的原则,突出四个重点,充分发挥主观能动性,引导广大党员着眼履行军队神圣使命,紧密联系思想和本职岗位实际,自觉把开展先进性教育的过程作为加强党性修养、实践先进性要求、塑造先进性形象的过程。

关键词：党性修养先进性保持

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体育锻炼对大学生主观幸福感的影响:同伴关系的中介效应

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首都体育学院学报 2015年第2期27卷 165-171页

作者：陈章源於鹏南京信息职业技术学院体育部江苏南京210023 南京工业大学体育部江苏南京211800

在测试人口学变量调节效应的同时,探讨体育锻炼对大学生主观幸福感的影响,验证同伴关系的中介效应。采用体育活动等级量表、生活满意度量表、积极情感消极情感量表(修订版)和青少年运动友谊质量量表对330名大学生进行调查。结果显示:大... 详细信息

在测试人口学变量调节效应的同时,探讨体育锻炼对大学生主观幸福感的影响,验证同伴关系的中介效应。采用体育活动等级量表、生活满意度量表、积极情感消极情感量表(修订版)和青少年运动友谊质量量表对330名大学生进行调查。结果显示:大学生具有良好的同伴关系和主观幸福感,但其体育锻炼现状却不容乐观;性别在体育锻炼、同伴关系和主观幸福感中差异显著(男生均显著高于女生);体育锻炼、同伴关系与主观幸福感间两两显著正相关。回归分析表明:体育锻炼对同伴关系和主观幸福感回归效应显著,并分别解释变异的3.1%和4.4%;同伴关系在体育锻炼基础上对主观幸福感回归效应显著,在体育锻炼解释主观幸福感时具备部分中介效应,其效应占总效应值的13.91%。结构方程模型验证了体育锻炼、同伴关系对主观幸福感的综合影响,以及同伴关系的中介效应、性别的调节效应。

关键词：大学生体育锻炼主观幸福感同伴关系中介效应调节效应

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Analysis of power transients in a cascade of EDFAs

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Communications in Nonlinear Science and Numerical Simulation 1997年第3期 61-65页

作者： zhangyuan chen, Guisheng Xiong, Anshi Xu, & Deming Wu (National Laboratory on Local Fiber Optic Communication Network & Advanced Optical Communication, Electronics Department, Peking University)

ＡｎａｌｙｓｉｓｏｆｐｏｗｅｒｔｒａｎｓｉｅｎｔｓｉｎａｃａｓｃａｄｅｏｆＥＤＦＡｓ１１ＴｈｅｐａｐｅｒｗａｓｒｅｃｅｉｖｅｄｏｎＳｅｐ．１２，１９９７２ｔｈｉｓｗｏｒｋｉｓｓｕｐｐｏｒｔｅｄｂｙ８６３ＨｉｇｈＴｅｃ... 详细信息

ＡｎａｌｙｓｉｓｏｆｐｏｗｅｒｔｒａｎｓｉｅｎｔｓｉｎａｃａｓｃａｄｅｏｆＥＤＦＡｓ１１ＴｈｅｐａｐｅｒｗａｓｒｅｃｅｉｖｅｄｏｎＳｅｐ．１２，１９９７２ｔｈｉｓｗｏｒｋｉｓｓｕｐｐｏｒｔｅｄｂｙ８６３ＨｉｇｈＴｅｃｈｎｏｌｏｇｙＲｅｓｅａｒｃｈＤｅ...

关键词： erbium doped fiber amplifier power transient wavelength division multiplexing

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Wideband tunable optoelectronic oscillator based on a single-bandpass microwave photonic filter and a recirculating delay line

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Chinese Optics Letters 2018年第11期16卷 22-26页

作者： Yongchi Xu Huanfa Peng Rui Guo Huayang Du Guoqing Hu Lixin Zhu zhangyuan chen State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer SciencePeking UniversityBeijing 100871China Peking University Shenzhen Institution Shenzhen 518055China Corresponding author chenzhy@pku.edu.c

A wideband tunable optoelectronic oscillator （OEO） based on a tunable single-bandpass microwave photonic filter （MPF） and a recirculating delay line is proposed and experimentally demonstrated. The MPF is formed by cascading a finite impulse response filter and an infinite impulse response filter, which can enhance the quality factor of the MPF and suppress the side modes of the OEO. The frequency response of the tunable MPF is theoretically analyzed. By placing the MPF into the OEO, tunable microwave signals from 10.3 GHz to 26.7 GHz and a 100 MHz step tunability are experimentally demonstrated. The phase noise is -113 dBc/Hz@10 kHz. The results agree well with the theory.

关键词： Microwave photonic filters Microwaves Oscillators Phase noise

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