检索结果-内蒙古大学图书馆

arXiv 2018年

作者： Ruan, Xiaoke Zhang, Lei Yang, Fan Zhu, Yixiao Zhang, Fan State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing100871 China

n this paper, we experimentally demonstrate that a silicon dual-drive Mach–Zehnder modulator (DD-MZM) has great potential for next-generation data center interconnections (DCIs). For intra-data center interconnections, 120 Gb/s Nyquist 4-ary pulse amplitude modulation (PAM-4) signal is successfully generated with a silicon DD-MZM operating at C-band and transmitted over 2 km standard single-mode fiber (SSMF) with a bit error rate (BER) of 5.55 × 10-4. For inter-data center interconnections, single sideband (SSB) modulation is chosen to avoid power fading caused by fiber chromatic dispersion and square-law detection. We report the generation and transmission of 112 Gb/s Nyquist SSB PAM-4 signal by using the same silicon DD-MZM and Kramers-Kronig (KK) direct detection. A two-tap digital post filter and maximum likelihood sequence detection (MLSD) are applied to compensate for the limited system bandwidth. After 80 km SSMF transmission, the BER is 2.46×10-3 that is below the 7% HD-FEC threshold of 3.8×10-3. To the best of our knowledge, our work reports the highest single-lane bitrate of 80 km SSB transmission based on a silicon DD-MZM. Our study also shows the feasibility of silicon photonic modulator for DCI applications in the future. Copyright © 2018, The Authors. All rights reserved.

关键词： Light modulators

来源：评论

学校读者我要写书评

暂无评论

Floquet chern insulators of light

arXiv

引用

arXiv 2019年

作者： He, Li Addison, Zachariah Jin, Jicheng Mele, Eugene J. Johnson, Steven G. Zhen, Bo Department of Physics and Astronomy University of Pennsylvania PhiladelphiaPA19104 United States State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing100871 China Department of Mathematics Massachusetts Institute of Technology CambridgeMA02139 United States

Achieving topologically-protected robust transport in optical systems has recently been of great interest1–3. Most studied topological photonic structures can be understood by solving the eigenvalue problem of Maxwell’s equations for a static linear system1,4. Here, we extend topological phases into dynamically driven nonlinear systems and achieve a Floquet Chern insulator of light in nonlinear photonic crystals (PhCs). Specifically, we start by presenting the Floquet eigenvalue problem in driven two-dimensional PhCs and show it is necessarily non-Hermitian. We then define topological invariants associated with Floquet bands using non-Hermitian topological band theory, and show that topological band gaps with non-zero Chern number can be opened by breaking time-reversal symmetry through the driving field. Furthermore, we show that topological phase transitions between Floquet Chern insulators and normal insulators occur at synthetic Weyl points5,6 in a three-dimensional parameter space consisting of two momenta and the driving frequency. Finally, we numerically demonstrate the existence of chiral edge states at the interfaces between a Floquet Chern insulator and normal insulators, where the transport is non-reciprocal and uni-directional. Our work paves the way to further exploring topological phases in driven nonlinear optical systems and their optoelectronic applications, and our method of inducing Floquet topological phases is also applicable to other wave systems, such as phonons, excitons, and polaritons. Copyright © 2019, The Authors. All rights reserved.

关键词： Eigenvalues and eigenfunctions

来源：评论

学校读者我要写书评

暂无评论

Learning what to share: Leaky multi-task network for text classification 27

Learning what to share: Leaky multi-task network for text cl...

引用

27th International Conference on Computational Linguistics, COLING 2018

作者： Xiao, Liqiang Zhang, Honglun Chen, Wenqing Wang, Yongkun Jin, Yaohui State Key Lab of Advanced Optical Communication System and Network Shanghai Jiao Tong University China Artificial Intelligence Institute Shanghai Jiao Tong University China Network and Information Center Shanghai Jiao Tong University China

ISBN: (纸本)9781948087506

Neural network based multi-task learning has achieved great success on many NLP problems, which focuses on sharing knowledge among tasks by linking some layers to enhance the performance. However, most existing approaches suffer from the interference between tasks because they lack of selection mechanism for feature sharing. In this way, the feature spaces of tasks may be easily contaminated by useless features borrowed from others, which will confuse the models for making correct prediction. In this paper, we propose a multi-task convolutional neural network with the Leaky Unit, which has memory and forgetting mechanism to filter the feature flows between tasks. Experiments on five different datasets for text classification validate the benefits of our approach. © 2018 COLING 2018 - 27th International Conference on Computational Linguistics, Proceedings. All rights reserved.

关键词： Classification (of information)

来源：评论

学校读者我要写书评

暂无评论

UAV-assisted Data Dissemination With Proactive Caching and File Sharing in V2X networks

UAV-assisted Data Dissemination With Proactive Caching and F...

引用

IEEE Global communications Conference

作者： Rui Lu Rongqing Zhang Xiang Cheng Liuqing Yang Department of Electronics State Key Laboratory of Advanced Optical Communication Systems and Networks School of EECS Peking University Beijing China Shenzhen Research Institute of Big Data (SRIBD) Shenzhen China School of Software Engineering Tongji University Shanghai China Department of Electrical and Computer Engineering Colorado State University CO USA

ISBN: (数字)9781728109626

ISBN: (纸本)9781728109633

Vehicle-to-Everything (V2X) communications refers to an intelligent and connected vehicular network where all vehicles and infrastructure systems are interconnected with each other. Data dissemination is playing an increasingly significant role in enhancing the network connectivity and data transmission performance. However, conventional scenarios and protocols cannot satisfy the growing pluralistic and superior quality of services (QoS) requirements of included vehicles. Therefore, in this paper, we propose a novel unmanned aerial vehicle (UAV)-assisted data dissemination protocol with proactive caching at the vehicles and an advanced file sharing strategy for revolutionizing communications. Specifically, in the proactive caching phase, we employ UAVs to act as flying base stations (BSs) for information interactions. Considering the time-variant network topology, we further propose a spatial scheduling (SS) algorithm for the trajectory optimization of each UAV, which can expedite the caching process and boost the system throughput. Then in the file sharing phase, based on the previous caching status, we provide a relay ordering algorithm to enhance the network transmission performance. Numerical results verify that our proposed UAV-assisted data transmission protocol can achieve a desirable system performance in terms of the downloading process, network throughput, and average data delivery delay.

关键词： Data dissemination Relays Protocols Quality of service Scheduling Throughput Wireless communication

来源：评论

学校读者我要写书评

暂无评论

FPGA Implementation of Real-Time Secure OFDM Transmission Using Digital Chaos

FPGA Implementation of Real-Time Secure OFDM Transmission Us...

引用

International Conference on Transparent optical networks

作者： Ying Wang Xuelin Yang Weisheng Hu State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China

The real-time implementation is demonstrated using Field-Programmable Gate Array (FPGA) hardware with Xilinx system Generator (XSG), for secure orthogonal frequency division multiplexing (OFDM) transmission. Vivado software and Verilog programming language are used for the purpose of the real-time system design and the OFDM data transmission. An encrypted 16-QAM OFDM data transmission and recovery are successfully carried out using FPGA. The multi-fold data encryption is achieved via the input data encryption using XOR, real and imaginary parts of QAM symbols encryption, where the chaotic sequences are generated by a hyper digital chaos. As a result, it provides a key space of ~10 22 to enhance the confidentiality of OFDM data transmission.

关键词： OFDM Encryption Field programmable gate arrays Quadrature amplitude modulation Chaotic communication

来源：评论

学校读者我要写书评

暂无评论

Multi-Fold Physical Layer Data Encryption Using Chaotic Frequency Hopping

Multi-Fold Physical Layer Data Encryption Using Chaotic Freq...

引用

International Conference on Transparent optical networks

作者： Cong Geng Xuelin Yang Weiqiang Sun Weisheng Hu State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China

This paper proposes a multi-fold optical frequency hopping (FH) scheme based on hyper digital chaos. The multi-fold data encryption is achieved by the incorporation of chaotic sequences into traditional FH scheme, where a hyper digital chaos is implemented to generate the optical carrier frequency, FH rate as well as the available frequency set respectively. As a result, a huge key space of 10 58 is provided in the proposed multi-fold data encryption. The performances of data transmission and security enhancement of the proposed FH scheme are simulated and analyzed in details.

关键词： Encryption Chaotic communication Frequency modulation Time-frequency analysis

来源：评论

学校读者我要写书评

暂无评论

$100\text{Gb}/\mathrm{s}/\lambda$ IM-DD PON Using 20G-Class optical Devices by Machine Learning Based Equalization

$100\text{Gb}/\mathrm{s}/\lambda$ IM-DD PON Using 20G-Class ...

引用

European Conference on optical communication (ECOC)

作者： Lilin Yi Peixuan Li Tao Liao Weisheng Hu State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China

We propose the novel machine learning based equalization algorithm for IM-DD PON and extend the capacity of PON from 50Gbps/λ to 100Gbps/λ. 100Gb/s PAM8/PAM16 IM-DD transmission is achieved over 25km SSMF using 20G-... 详细信息

关键词： Passive optical networks Machine learning Machine learning algorithms optical receivers optical sensors Nonlinear optics

来源：评论

学校读者我要写书评

暂无评论

Simultaneous 40-channel DWDM-DPSK signal monitoring system realized by using single-channel linear optical sampling technique

Simultaneous 40-channel DWDM-DPSK signal monitoring system r...

引用

optical Fiber communication Conference, OFC 2018

作者： Xu, Bingxin Fan, Xinyu Wang, Shuai He, Zuyuan State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China

We propose a novel DWDM signal monitoring system based on linear optical sampling technique with only a single channel. A system with 40-channel 20 Gb/s DWDM-DPSK signals is successfully monitored experimentally. ... 详细信息

ISBN: (纸本)9781943580385

关键词： Dense wavelength division multiplexing

来源：评论

学校读者我要写书评

暂无评论

Nonlinear amplification for a 10 W, 750-MHz Yb: Fiber frequency comb

Nonlinear amplification for a 10 W, 750-MHz Yb: Fiber freque...

引用

Conference on Lasers and Electro-Optics/Pacific Rim, CLEOPR 2018

作者： Ishii, Hirotaka Xu, Bo Ma, Yuxuan Matsushima, Isao Nakajima, Yoshiaki Schibli, Thomas Zhang, Zhigang Minoshima, Kaoru 1-5-1 Chofugaoka Chofu Tokyo182-8585 Japan Project Japan State Key Laboratory of Advanced Optical Communication System and Networks Peking University Beijing100871 China Dept. of Physics University of Colorado at Boulder 2000 Colorado Avenue BoulderCO80309-0390 United States

In this study, a self-referenced 750-MHz Yb:fiber frequency comb was amplified to achieve an average power of 10 W with nonlinear amplification. Pulse duration of 107 fs and a clear comb structure was obtained. ©... 详细信息

ISBN: (纸本)9781943580453

关键词： Coherence Diode lasers Frequency combs Multimode lasers Nonlinear effects Oscillators

来源：评论

学校读者我要写书评

暂无评论

Piecewise linear equalizer for 56 Gbit/s PAM-4 signal transmission using DML with large adiabatic chirp

Piecewise linear equalizer for 56 Gbit/s PAM-4 signal transm...

引用

45th European Conference on optical communication (ECOC 2019)

作者： Yan Fu Deming Kong Haiyun Xin Shi Jia Kuo Zhang Meihua Bi Weisheng Hu Hao Hu State Key lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China DTU Fotonik Technical University of Denmark Kgs. Lyngby Denmark DTU Fotonik Technical University of Denmark Kgs. Lyngby Denmark School of Communication Engineering Hangzhou Dianzi University Hangzhou Zhejiang China

Computationally efficient piecewise linear (PWL) equalizer is, for the first time, proposed to compensate amplitude-dependent skews caused by DML chirp and chromatic dispersion. 56 Gbit/s PAM-4 signals in C-band are r...

ISBN: (纸本)9781839531859

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：