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Efficient dynamic coherence transfer relying on offset locking using optical phase-locked loop

Efficient dynamic coherence transfer relying on offset locki...

2017 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing

作者： Xie, Weilin Shi, Hongxiao Zhou, Qian Xia, Zongyang Qin, Jie Zhang, Lin Lin, Xi Hu, Weisheng State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China School of Optoelectronics Beijing Institute of Technology Beijing100081 China Laboratoire Aimé Cotton CNRS-Université Paris Saclay Campus D'Orsay Orsay Cedex91405 France School of Electrical and Computer Engineering Georgia Institute of Technology North Avenue AtlantaGA30332 United States

ISBN: (数字)9781510617469

ISBN: (纸本)9781510617452

We design and experimentally demonstrate a highly efficient coherence transfer based on composite optical phaselocked loop comprising multiple feedback servo loops. The heterodyne offset-locking is achieved by conducting an acousto-optic frequency shifter in combination with the current tuning and the temperature controlling of the semiconductor laser. The adaptation of the composite optical phase-locked loop enables the tight coherence transfer from a frequency comb to a semiconductor laser in a fully dynamic manner. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Microwave photonics

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A Novel Forwarding Method for Full-Duplex Two-Way Relay networks

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China communications 2017年第4期14卷 65-72页

作者： Shuangshuang Han Xiang Cheng Liuqing Yang The State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of SciencesBeijing China and Qingdao Academy of Intelligent Industries The State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Department of Electrical and Computer Engineering Colorado State University

An estimate-and-forward(EF) scheme for single-input single-output(SISO) and multiple-input multiple-output(MIMO) full-duplex two-way relay networks is proposed and analyzed. The relay estimates the received signal from two terminal nodes by a minimum mean squared error(MMSE) estimation and forwards a scaled version of the MMSE estimate to the destination. The proposed EF outperforms conventional amplify-and-forward(AF) and decode-and-forward(DF) across all signal-to-noise ratio(SNR) region. Because its computational complexity is high for relays with a large number of antennas(large MIMO) and/or high order constellations, an approximate EF scheme, called list EF, are thus proposed to reduce the computational complexity. The proposed list EF computes a candidate list for the MMSE estimate by using a sphere decoder, and it approaches the performance of the exact EF relay at a negligible performance loss. The proposed forwarding approach also could be used to other relay networks, such as half-duplex, one-way or massive MIMO relay networks.

关键词： estimate-and-forward full-duplex two-way relay wireless communications

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High contrast linking 6 lasers to a 1 GHz Ybfiber laser frequency comb

arXiv

引用

arXiv 2018年

作者： Ma, Yuxuan Meng, Fei Wang, Yan Wang, Aimin Zhang, Zhigang State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing100871 China National Institute of Metrology Beijing100029 China

We demonstrate a 0.95 GHz repetition rate fully stabilized Yb:fiber frequency comb without optical amplification. Benefitted from the high mode power and high coherence, this comb achieved 35 dB to 42 dB signal to noise ratio on the direct heterodyne beat signals with at least 6 continuous wave lasers (at 580nm, 679nm, 698nm, 707nm, 813nm and 922 nm) while keeping >40 dB carrier envelop frequency signal. It can be used for the direct measurement of optical frequencies in visible and near-infrared wavelengths, and has a great potential on simultaneous comparison of multiple optical frequencies. Copyright © 2018, The Authors. All rights reserved.

关键词： Optical materials

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Receive buffer pre-division based flow control for MPTCP 1

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13th International Conference on Mobile Ad-hoc and Sensor networks, MSN 2017

作者： Han, Jiangping Xue, Kaiping Yue, Hao Hong, Peilin Yu, Nenghai Li, Fenghua Department of EEIS University of Science and Technology of China HefeiAnhui230027 China Science and Technology on Communication Networks Laboratory ShijiazhuangHebei050081 China Department of Computer Science San Francisco State University San FranciscoCA94132 United States State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing100093 China

ISBN: (数字)9789811088902

ISBN: (纸本)9789811088896

Multipath TCP (MPTCP) enables terminals utilizing multiple interfaces for data transmission simultaneously, which provides better performance and brings many benefits. However, using multiple paths brings some new challenges. The asymmetric parameters among different subflows may cause the out-of-order problem and load imbalance problem, especially in wireless network which has more packet loss. Thus it will significantly degrade the performance of MPTCP. In this paper, we propose a Receive Buffer Pre-division based flow control mechanism (RBP) for MPTCP. RBP divides receive buffer according to the prediction of receive buffer occupancy of each subflow, and controls the data transmission on each subflow using the divided buffer and the number of out-of-order packets, which can significantly improve the performance of MPTCP. We use the NS-3 simulations to verify the performance of our scheme, and the simulation results show that RBP algorithm can significantly increase the global throughput of MPTCP. © Springer Nature Singapore Pte Ltd. 2018.

关键词： Flow control

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Correction to “Fulcrum: Flexible Network Coding for Heterogeneous Devices”

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IEEE Access 2021年 9卷 108199-108199页

作者： Daniel E. Lucani Morten V. Pedersen Diego Ruano Chres W. Sørensen Frank H. P. Fitzek Janus Heide Olav Geil Vu Nguyen Martin Reisslein Aarhus University Aarhus Denmark Steinwurf ApS Aalborg Denmark IMUVA-Mathematics Research Institute University of Valladolid Valladolid Spain Aalborg University Aalborg Denmark Danish Ministry of Defence Acquisition and Logistics Organization Copenhagen Denmark 5G Lab Germany Deutsche Telekom Chair of Communication Networks Technische Universität Dresden Dresden Germany Centre for Tactile Internet with Human-in-the-Loop (CeTI) Technische Universität Dresden Dresden Germany School of Electrical Computer and Energy Engineering Arizona State University Tempe AZ USA

In the above article [1] , in Section II-B.1)a, titled “Outer Encoding,” the first sentence of the second paragraph should be corrected to consistently use $\Omega _{j}$ to denote the coded packets, i.e., this sentence should state: “For systematic outer encoding, the outer encoding vectors for coded packets $\Omega _{j},\,\,j = 1, 2, \ldots, n$ , form an identity matrix of dimension $n \times n$ , i.e., coded packets $\Omega _{j}, j = 1, 2, \ldots, n$ , are identical to the source packets $P_{j}$ .”

关键词： Systematics Network coding Encoding

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Modelling of synchronisation and energy performance of FBE- and LBE-based standalone LTE-U networks

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Journal of engineering 2017年第7期2017卷 292-299页

作者： Li, Jiamin Shan, Hangguan Huang, Aiping Yuan, Jiantao Cai, Lin X. Zhejiang Provincial Key Laboratory of Information Processing and Communication Networks Hangzhou China College of Information Science and Electronic Engineering Zhejiang University Hangzhou China Department of Electrical and Computer Engineering Illinois Institute of Technology Chicago United States

Without the aid of licensed channel, deploying long-term evolution (LTE) networks over unlicensed spectrum (named standalone LTE-U networks) faces the difficulty of establishing and maintaining synchronisation between user equipments and base stations. In this work, considering the two modes of listen-before-talk-based channel access scheme, frame-based equipment (FBE) and load-based equipment (LBE), the authors propose analytical frameworks to study the successful probability of synchronisation and the energy consumption of synchronisation in a standalone LTE-U network. Specifically, for the LBE mode, the authors also propose a Lattice-Poisson algorithmbased approach to derive the distribution of the channel non-occupancy period of a standalone LTE-U network. Furthermore, the authors explore the impact of diverse protocol parameters of both FBE and LBE modes on the two studied performance metrics. Simulation results demonstrate the accuracy of the analysis, and shed some light on the selection of FBE and LBE for standalone LTE-U networks, in terms of synchronisation, energy consumption, and throughput of standalone LTE-U and Wi-Fi networks.

关键词： Synchronization

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Flexible energy management protocol for cooperative EV-to-EV charging

arXiv

引用

arXiv 2018年

作者： Zhang, Rongqing Cheng, Xiang Yang, Liuqing State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Beijing China Department of Electrical and Computer Engineering Colorado State University CO United States Shenzhen Research Institute of Big Data Shenzhen Guangdong China

In this paper, we investigate flexible power transfer among electric vehicles (EVs) from a cooperative perspective in an EV system. First, the concept of cooperative EV-to- EV (V2V) charging is introduced, which enables active cooperation via charging/discharging operations between EVs as energy consumers and EVs as energy providers. Then, based on the cooperative V2V charging concept, a flexible energy management protocol with different V2V matching algorithms is proposed, which can help the EVs achieve more flexible and smarter charging/discharging behaviors. In the proposed energy management protocol, we define the utilities of the EVs based on the cost and profit through cooperative V2V charging and employ the bipartite graph to model the charging/discharging cooperation between EVs as energy consumers and EVs as energy providers. Based on the constructed bipartite graph, a max-weight V2V matching algorithm is proposed in order to optimize the network social welfare. Moreover, taking individual rationality into consideration, we further introduce the stable matching concepts and propose two stable V2V matching algorithms, which can yield the EV-consumer-optimal and EVprovider- optimal stable V2V matchings, respectively. Simulation results verify the efficiency of our proposed cooperative V2V charging based energy management protocol in improving the EV utilities and the network social welfare as well as reducing the energy consumption of the EVs. Copyright © 2018, The Authors. All rights reserved.

关键词： Electric vehicles

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Generation of 47 fs Pulses from an Er:Fiber Amplifier

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Chinese Physics Letters 2017年第7期34卷 101-104页

作者：欧尚明刘关玉雷卉张志刚张庆茂 School of Information Optoelectronics Science and Technology South China Normal University Guangzhou 510006 State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing 100871 Guangzhou Research Institute Of O-M-E Technology Guangzhou 510663

We demonstrate a self-starting erbium fiber oscillator-amplifier system based on the nonlinear polarization rota- tion mode-locked mechanism. The direct output pulse from the amplifier is 47fs with an average power of 1.22 W and a repetition rate of 50 MHz, corresponding to a pulse energy of 24 nJ. The full width at half-maximum of the spectrum of the output pulses is approximately 93nm at a central wavelength of 1572nm so that the transform- limited pulse duration is as short as 39 fs. Due to the imperfect dispersion compensation, we compress the pulses to 47fs in this experiment.

关键词： Generation of 47 fs Pulses from an Er:Fiber Amplifier

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Microwave frequency upconversion employing a coupling-modulated ring resonator

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Photonics Research 2017年第6期5卷 208-213页

作者： YIMING ZHONG LINJIE ZHOU YANYANG ZHOU YUJIE XIA SIQI LIU LIANGJUN LU JIANPING CHEN XINGJUN WANG Shanghai Institute for Advanced Communication and Data Science State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer SciencePeking University

We present a method to generate a frequency-doubled microwave signal by employing a coupling-modulated ring resonator. Critical coupling is achieved when the resonator intrinsic loss is perfectly balanced by the external coupling enabled by a Mach–Zehnder interferometer coupler. The high suppression of the carrier leads to a clean two-tone optical signal with the frequency interval two times larger than that of the input microwave *** beating of the two-tone signal at a photodiode generates the frequency upconverted microwave signal.A theoretical model is established to analyze the modulation process and the microwave signal *** results show that the electrical harmonic suppression ratio is around ~20 dB(29 dB) for an input microwave signal with 5 dBm(10 dBm) power.

关键词： Microwave frequency upconversion employing a coupling-modulated ring resonator MZI

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PAPR reduction using iterative clipping/filtering and ADMM approaches for OFDM-based mixed-numerology systems

arXiv

引用

arXiv 2019年

作者： Liu, Xiaoran Zhang, Xiaoying Zhang, Lei Xiao, Pei Wei, Jibo Zhang, Haijun Leung, Victor C.M. Department of Electronic Science National University of Defense Technology Changsha410073 China School of Engineering University of Glasgow GlasgowG12 8QQ United Kingdom 5G Innovation Centre Institute for Communication Systems University of Surrey GuildfordGU2 7XH United Kingdom Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Engineering and Technology Research Center for Convergence Networks and Ubiquitous Services University of Science and Technology Beijing Beijing100083 China Department of Electrical and Computer Engineering University of British Columbia VancouverBCV6T 1Z4 Canada

Mixed-numerology transmission is proposed to support a variety of communication scenarios with diverse requirements. However, as the orthogonal frequency division multiplexing (OFDM) remains as the basic waveform, the peak-to average power ratio (PAPR) problem is still cumbersome. In this paper, based on the iterative clipping and filtering (ICF) and optimization methods, we investigate the PAPR reduction in the mixed-numerology systems. We first illustrate that the direct extension of classical ICF brings about the accumulation of inter-numerology interference (INI) due to the repeated execution. By exploiting the clipping noise rather than the clipped signal, the noise-shaped ICF (NS-ICF) method is then proposed without increasing the INI. Next, we address the in-band distortion minimization problem subject to the PAPR constraint. By reformulation, the resulting model is separable in both the objective function and the constraints, and well suited for the alternating direction method of multipliers (ADMM) approach. The ADMM-based algorithms are then developed to split the original problem into several subproblems which can be easily solved with closed-form solutions. Furthermore, the applications of the proposed PAPR reduction methods combined with filtering and windowing techniques are also shown to be effective. Copyright © 2019, The Authors. All rights reserved.

关键词： Orthogonal frequency division multiplexing

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