检索结果-内蒙古大学图书馆

Diode laser using narrow bandwidth interference filter at 852 nm and its application in Faraday anomalous dispersion optical filter

引用

Chinese Physics B 2016年第8期25卷 113-116页

作者：蒋招杰周琦陶智明张晓刚张盛楠祝传文林平卫陈景标 State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science and Center for Quantum Information Technology Peking University Beijing 100871 China School of Photoelectric Information University of Electronic Science and Technology Chengdu 611731 China College of Science Guizhou University of Engineering Science Bijie 551700 China National Institute of Metrology Beijing 100029 China

We demonstrate an 852-nm external cavity diode laser（ECDL） system whose wavelength is mainly determined by an interference filter instead of other wavelength selective elements. The Lorentzian linewidth measured by the heterodyne beating between two identical lasers is 28.3 k Hz. Moreover, we test the application of the ECDL in the Faraday atomic *** saturated absorption spectrum, the transmission spectrum of the Faraday atomic filter at 852 nm is measured by using the ECDL. This interference filter ECDL method can also be extended to other wavelengths and widen the application range of diode laser.

关键词： filters diode lasers Faraday effect

来源：评论

学校读者我要写书评

暂无评论

Resource allocation for multiuser MIMO-OFDM systems with various suboptimal detectors

Resource allocation for multiuser MIMO-OFDM systems with var...

引用

Asia-Pacific Conference on communications

作者： Jing Mao Chen Chen Haige Xiang State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing China

ISBN: (纸本)9781509006779

The performance of multiuser multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) systems can be significantly improved by using efficient resource allocation schemes. There are a lot of resource allocation schemes to maximize the system capacity. However, under a practical circumstance of employing a suboptimal MIMO detector, optimizing for maximum capacity may not be proper. In this paper, we investigate resource allocation schemes to minimize the bit error rate (BER) for various suboptimal detectors, including the zero forcing (ZF) detector, the successive interference cancellation (SIC) detector, the lattice reduction (LR) based ZF detector, and the LR based SIC detector. For the ZF and SIC detectors, we study the subcarrier allocation among users and power allocation over subcarriers and antennas. The optimal algorithm is investigated and a suboptimal scheme with low complexity is proposed for each detector. For the LR based ZF and SIC detectors, we propose suboptimal schemes with allocating power equally over antennas. Simulation results confirm that the proposed scheme improves the BER performance for each detector.

关键词： Resource management Detectors Silicon carbide Bit error rate Signal to noise ratio Antennas OFDM

来源：评论

学校读者我要写书评

暂无评论

Netography: Troubleshoot your network with packet behavior in SDN

Netography: Troubleshoot your network with packet behavior i...

引用

IEEE Symposium on Network Operations and Management

作者： Yusu Zhao Pengfei Zhang Yaohui Jin State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University

ISBN: (纸本)9781509002245

Network troubleshooting is always a tough and daunting task for network operators to struggle with, due to difficultly observed network state, large network size and limited tools such as ping and traceroute. Software-defined networking (SDN) brings us the centralized network control and the customized network management over the entire network, which enables new ways of network troubleshooting. Previous efforts focus on static checking, passive monitoring and active probing, which rely on scraping rules from either controller or network devices. Since those rules describe the actions supposed to be performed on packets, the actions having been performed on packets can be different. We propose the concept of packet behavior to describe the real changes of packets and highlight its importance towards network troubleshooting. Based on the novel approach of exporting packet behavior and flow rules via copies triggered by probes being actively sent, we present the design of Netography system and illustrate the procedures of troubleshooting tasks regarding forwarding errors as well as performance degradation caused by non-tenant-contention reasons. We implement a prototype and verify our system on a small deployment with three typical use cases.

关键词： Probes Performance evaluation Hardware Receivers Computer bugs IP networks Ports (Computers)

来源：评论

学校读者我要写书评

暂无评论

Hierarchical beam selection in mmWave multiuser MIMO systems with one-bit analog phase shifters

Hierarchical beam selection in mmWave multiuser MIMO systems...

引用

International Conference on Wireless communications and Signal Processing (WCSP)

作者： Shijian Gao Yue Dong Chen Chen Ye Jin State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing China

ISBN: (纸本)9781509028610

Hybrid digital/analog precoding has been widely utilized in millimeter-wave (mmWave) multiple-input multiple-output (MIMO) systems. Compared to the digital precoder, it is more challenging to design the analog precoder because of the constant amplitude (CA) constraints on the entries. Although high-resolution analog phase shifters (APSs) can provide more choices in phase adjustment, it also adds the difficulty in designing effective codebooks for beam selection. In addition, the finer APSs are accompanied by the higher hardware cost and power consumption. Driven by the low hardware cost and power consumption, we employ one-bit APSs to perform analog precoding. A simple codebook for hierarchical searching is designed. Then a low-complexity hierarchical beam selection algorithm is devised to reduce the training overhead. An approximate expression of spectral efficiency after hybrid precoding in one-bit-APS system is also derived, which is close to the simulation results in medium signal-to-noise ratio (SNR). Despite a performance degradation, both the theoretical analysis and the simulation results show that the performance is still comparable to the existing alternatives with much lower training overhead and hardware cost. Therefore, the proposed one-bit-APS system can be an acceptable tradeoff in practical implementation.

关键词： Radio frequency Precoding Structural beams NIST Training Antennas MIMO

来源：评论

学校读者我要写书评

暂无评论

Beyond Mrad/s Polarization Tracking Speed of Complementary Polarization-diversity Coherent Receiver for Remote LO

Beyond Mrad/s Polarization Tracking Speed of Complementary P...

引用

optical Fiber communication Conference, OFC 2016

作者： Ji, Honglin Li, Jingchi Li, Xingfeng Dong, Shuangyu Xu, Zhaopeng Su, Yikai Shieh, William Department of Electrical and Electronic Engineering The University of Melbourne VIC3010 Australia State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China

ISBN: (纸本)9781943580071

We demonstrate a complementary polarization-diversity coherent receiver (C-PDCR) to accommodate arbitrarily varying SOP of remotely delivered LO. The polarization tracking speed can reach 1 Mrad/s without performance degradation and exceed 2 Mrad/s with a 1-dB OSNR penalty for a 1.08-Tb/s dual-polarization (DP) PCS-256QAM signal. © 2022 The Author(s).

关键词：

来源：评论

学校读者我要写书评

暂无评论

Complementary Polarization-diversity Self-Coherent Homodyne Receiver with Rapid Polarization Tracking for Remote LO

Complementary Polarization-diversity Self-Coherent Homodyne ...

引用

optical Fiber communication Conference, OFC 2016

ISBN: (纸本)9781943580071

We propose a complementary polarization-diversity coherent receiver (C-PDCR) based on complementary polarization detection. The proposed C-PDCR features rapid polarization tracking for remote LO using electronic DSP. The robustness is verified by a 1.08-Tb/s dual-polarization PCS-256QAM signal with up to 314-Krad/s polarization tracking speed. © 2022 The Author(s).

关键词：

来源：评论

学校读者我要写书评

暂无评论

Transmission of Tb/s CPRI-equivalent Rate Using Coherent Digital-Analog Radio-over-Fiber (DA-RoF) system

Transmission of Tb/s CPRI-equivalent Rate Using Coherent Dig...

引用

optical Fiber communication Conference, OFC 2016

作者： Zhuge, Qunbi Xu, Yicheng Fan, Yunyun Zeng, Xiaobo Fu, Mengfan Yi, Lilin Hu, Weisheng Liu, Xiang State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China Hong Kong Research Center Huawei Technologies Hong Kong Hong Kong

A coherent digital-analog radio-over-fiber (DA-RoF) system is proposed and experimentally demonstrated. An EVM below 3.5% with a CPRI equivalent rate of 1 Tb/s is achieved using a 25 Gbaud dual-polarization signal ove...

ISBN: (纸本)9781943580071

关键词：

来源：评论

学校读者我要写书评

暂无评论

Field-Trial of a Real-Time 100 Gb/s TWDM-PON Based on 10G-Class optical Devices

Field-Trial of a Real-Time 100 Gb/s TWDM-PON Based on 10G-Cl...

引用

ECOC 2016;42nd European Conference on optical communication

作者： Lilin Yi Honglin Ji Zhengxuan Li Xiang Li Cai Li Qi Yang Lei Xue Xiaodong Wang Suyi Wang Ying Yang Junbo Xu Shaohua Yu Weisheng Hu State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University State Key Laboratory of Optical Communication Technologies and Networks Wuhan Research Institute of Posts & Telecommunications Fiberhome Telecommunication Technologies Co. Ltd

We show the first field trial of 100G-PON with downstream/upstream data rates of 25/10Gb/s/lambda based on 10G-class optical devices supporting 40-km reach and 33-dB loss budget. The system stability is verified by 67... 详细信息

关键词： field experimentation system stability optical Devices Data transfer rates Bit error rate

来源：评论

学校读者我要写书评

暂无评论

Polarization fading elimination in phase-extracted OTDR for distributed fiber-optic vibration sensing

Polarization fading elimination in phase-extracted OTDR for ...

引用

International Conference on Photonics in Switching (PS)

作者： Guangyao Yang Xinyu Fan Bin Wang Qingwen Liu Zuyuan He State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China

We employed a polarization diversity system into phase-extracted coherent phase-sensitive OTDR. The results show that the amount of dead zones is significantly reduced after eliminating the influence of polarization f... 详细信息

ISBN: (纸本)9781509021475

关键词： optical fiber polarization Frequency measurement Vibrations Fans Phase measurement Fading channels Lead

来源：评论

学校读者我要写书评

暂无评论

Recent progresses of advanced CAP modulation for short reach optical interconnections

Recent progresses of advanced CAP modulation for short reach...

引用

Optoelectronics Global Conference (OGC)

作者： Jiangbing Du Lin Sun Wenjia Zhang Lin Ma Zuyuan He State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China

Multi-dimensional carrierless amplitude phase (CAP) modulation attracts a lot interest in recent optical communications as an advanced modulation format with improved performance. In this study, we have demonstrated a multiband multi-dimensional CAP modulation scheme and investigated its applications in short reach optical communication systems. Similar to discrete multitone (DMT) technique, several independent bands can be loaded with different three dimensional carrierless amplitude phase (3D-CAP) signals in the proposed multiband 3-dimensional CAP system, offering improved tolerance to non-flat channels. Experimental transmission of 3D-CAP over SMF up to 45Gbps is also demonstrated.

关键词： Modulation optical fibers optical interconnections Fiber nonlinear optics

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：