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Features of PBB-TE Architecture and GMPLS Control Technology

ZTE communications 2010年第3期8卷 13-16页

作者： Wei Jianwen Xie Rui Jin Yaohui The state key lab of advanced optical communication systems ＆ networks Shanghai Jiao Tong University Shanghai 200030 P. R. China Network ＆ Information Center of Shanghai Jiao Tong University Shanghai 200240 P. R. China

Time Division Multiplexing （TDM） transport networks are evolving to packet-oriented, and a variety of carrier-class packet transport technologies have emerged. Provider Backbone Bridge with Traffic Engineering （PBB-TE） is a connection-oriented packet transport technology that provides good scalability and manageability, and guarantees Quality of Service （eoS）. Generalized Multi-Protocol label Switching （GMPLS）is a mature transport network control plane technology that supports multiple data planes with different switching granularity. GMPLS-controlled PBB-TE is a promising solution for Packet Transport networks （PTN）.

关键词： GMPLS 多溴联苯控制技术 TE 广义多协议标签交换建筑时分多路复用分组传送

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Generation of linearized optical single sideband signal for broadband radio over fiber systems

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Chinese Optics Letters 2009年第4期7卷 339-343页

作者：王涛昌庆江苏翼凯 State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University

We propose a new scheme to generate broadband linearized optical single-sideband （OSSB） signal for radio over fiber systems. By using an unbalanced dual parallel Mach-zehnder modulator （DPMZM） followed by optical filtering, a linearized OSSB signal is obtained. With coherent detection, radio frequency （RF） signal can be recovered with simultaneously suppressed second-order distortion and third-order intermodulation. This scheme can be used to realize broadband systems with wide dynamic range.

关键词： Light modulators

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40-Gb/s star 16-QAM transmitter based on single dual-drive Mach-Zehnder modulator

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Chinese Optics Letters 2009年第2期7卷 109-111页

作者：高俊明徐新余昌庆江苏翼凯 State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University

We propose a 40-Gb/s star 16-ary quadrature amplitude modulation （16-QAM） transmitter using a single dual-drive Mach-Zehnder modulator （DDMZM）. This transmitter is demonstrated through experiment and simulation and shows the advantage of simplicity for implementation. Simulation results indicate that error free performance could be achieved for the generated signal after 80-km standard single-mode fiber （SSMF） transmission with coherent detection scheme.

关键词： Error detection Quadrature amplitude modulation Transmitters

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Hybrid information retrieval policies based on cooperative cache in mobile P2P networks

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中国高等学校学术文摘·计算机科学 2009年第3期3卷 381-395页

作者： Quanqing XU Hengtao SHEN Zaiben CHEN Bin CUI Xiaofang ZHOU Yafei DAI State Key Lab for Advanced Optical Communication System & Networks Peking University Beijing 100871 China School of Information Technology and Electrical Engineering The University of Queensland Brisbane Australia

The concept of Peer-to-Peer (P2P) has been in-troduced into mobile networks, which has led to the emer-gence of mobile P2P networks, and originated potential ap-plications in many fields. However, mobile P2P networks are subject to the limitations of transmission range, and highly dynamic and unpredictable network topology, giving rise to many new challenges for efficient information retrieval. In this paper, we propose an automatic and economical hybrid information retrieval approach based on cooperative cache. In this method, the region covered by a mobile P2P network is partitioned into subregions, each of which is identified by a unique ID and known to all peers. All the subregions then constitute a mobile Kademlia (MKad) network. The pro-posed hybrid retrieval approach aims to utilize the flooding-based and Distributed Hash Table (DHT)-based schemes in MKad for indexing and searching according to the designed utility functions. To further facilitate information retrieval, we present an effective cache update method by considering all relevant factors. At the same time, the combination of two different methods for cache update is also introduced. One of them is pull based on time stamp including two different pulls: an on-demand pull and a periodical pull, and the other is a push strategy using update records. Furthermore, we provide detailed mathematical analysis on the cache hit ratio of our approach. Simulation experiments in NS-2 showed that the proposed approach is more accurate and efficient than the existing methods.

关键词： peer-to-peer (P2P) flooding mobile Kadem-lia hybrid information retrieval cache update cache con-sistency

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Numerical analysis of four-wave-mixing based multichannel wavelength conversion techniques in fibers

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Journal of Semiconductors 2009年第5期30卷 55-59页

作者：贾亮张帆李明刘育梁陈章渊 Optoelectronic System Laboratory Institute of SemiconductorsChinese Academy of Sciences State Key Laboratory of Advanced Optical Communication Systems & Networks School of Electronics Engineering and Computer SciencePeking University

We numerically investigate four-wave-mixing （FWM） based multichannel wavelength conversion for amplitude-modulated signals, phase-modulated signals, together with mixed amplitude and phase modulated signals. This paper also discusses the influence of stimulated Brillouin scattering （SBS） effects on high-efficiency FWM-based wavelength conversion applications. Our simulation results show that DPSK signals are more suitable for FWM-based multichannel wavelength conversion because the OOK signals will suffer from the inevitable data- pattern-dependent pump depletion. In future applications, when the modulation format is partially upgraded from OOK to DPSK, the influence of OOK signals on the updated DPSK signals must be considered when using multi-channel wavelength conversion. This influence becomes severe with the increase of OOK channel number. It can be concluded that DPSK signals are more appropriate for both transmission and multichannel wavelength conversion, especially in long haul and high bit-rate system.

关键词： stimulated Brillouin scattering wavelength conversion four-wave mixing nonlinear optics

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Numerical analysis for four-wave mixing based wavelength conversion of differential phase-shift keying signals

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Chinese Optics Letters 2009年第7期7卷 617-620页

作者：贾亮张帆李明刘育梁陈章渊 State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Optoelectronic System Laboratory Institute of Semiconductors Chinese Academy of Sciences

We numerically investigate the main constrains for high efficiency wavelength conversion of differential phase-shift keying （DPSK） signals based on four-wave mixing （FWM） in highly nonlinear fiber （HNLF）. Using multi-tone pump phase modulation techniques, high efficiency wavelength conversion of DPSK signals is achieved with the stimulated BriIlouin scattering （SBS） effects effectively suppressed. Our analysis shows that there is a compromise between conversion efficiency and converted idler degradation. By optimizing the pump phase modulation configuration, the converted DPSK idler＇s degradation can be dramatically decreased through balancing SBS suppression and pump phase modulation degradation. Our simulation results also show that these multi-tone pump phase modulation techniques are more appropriate for the future high bit rate systems.

关键词： Conversion efficiency Degradation Frequency modulation optical frequency conversion Phase shift Phase shift keying Pumps Stimulated Brillouin scattering

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A new family of two-dimensional triple-codeweight asymmetric optical orthogonal code for OCDMA networks

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Chinese Optics Letters 2009年第2期7卷 102-105页

作者：殷洪玺梁巍马乐覃丽巧 School of Electronic and Information Engineering Dalian University of Technology State Key Laboratory on Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University

A new generation algorithm of two-dimensional triple-codeweight asymmetric optical orthogonal codes for optical code division multiple access （OCDMA） networks is proposed. The code cardinality is obtained and the error-probability performance for corresponding OCDMA system is analyzed. The codes with two constraints （i.e., auto- and cross-correlation properties） being unequal are taken into account. On the premise of fixed system resources, the code of the error-probability performance, it is shown cardinality can be significantly improved. By analysis that the codes with different parameters have different performances. Therefore, this type of codes can be applied to support diverse quality of service （QoS） and satisfy the quality requirement of different multimedia or distinct users, and simultaneously make the better use of bandwidth resources in oDtical networks.

关键词： Code division multiple access Data communication systems Distributed computer systems Multimedia systems Quality of service Two dimensional

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Can communications and sensors work together in one network?

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Frontiers of Optoelectronics 2009年第2期2卷 148-152页

作者： Xinwan LI Jianping CHEN State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University

With the development of both optical fiberbased communication and sensation, one interesting topic has been pointed out. How to connect those mountains of sensors to detect the signal in a large area, and how to make the cost of sensing system lower enough should be studied.A network of sensors is a good option. All sensing equipments, including the interrogators and the sensors,will be internetworking together. However, fiber optic communication networks have been developed very well over the past two decades. Is it necessary to rebuild a new network for sensors? In this paper, some new technologies in the two areas of fiber optic sensors and fiber optic communication will be addressed. Then, the available overlay architecture of a fiber optic sensors network will be presented. Finally, a polymorphous optical burst switching(POBS)-based architecture will be proposed, which can support all kinds of services, including digital data optical circuit/burst/packet switching and analog fiber optic sensor signal circuit/burst switching, etc.

关键词： optical sensor network optical communication network polymorphous optical burst switching (POBS) optical circuit switching (OCS) optical burst switching (OBS)

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A new cooperative detection technique with malicious user suppression

A new cooperative detection technique with malicious user su...

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2009 IEEE International Conference on communications, ICC 2009

作者： Tingting, Zhao Yuping, Zhao State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing China

ISBN: (纸本)9781424434350

Spectrum detection for vacant bands is one of the key techniques in cognitive radio (CR) systems. Cooperative detection outperforms single user detection in many aspects. The existence of malicious user could severely degrade the performance of cooperative CR systems. In this paper, a new cooperative detection scheme with malicious user suppression is proposed, which has lower complexity and better performance compared with the existing one. Simulation results show that when 25% users in the system are malicious, our proposed method can introduce more improvement of missed detection probability by nearly 20%. ©2009 IEEE.

关键词： Cognitive radio

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A scheme of photonic notch filter using DGD method for radio-over-fiber communication systems

A scheme of photonic notch filter using DGD method for radio...

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Progress in Electromagnetics Research Symposium 2009, PIERS 2009 Beijing

作者： Gao, Hanhong Wu, Jinxuan Tu, Zhao Zhang, Cheng Wu, Dandan Hu, Weiwei Chen, Zhangyuan State Key Laboratory on Advanced Optical Communication Systems and Networks Peking University Beijing China

ISBN: (纸本)9781618390554

We demonstrate a scheme of photonic notch filter using differential group delay (DGD) method for radio-over-fiber (RoF) communication systems. It is continuously tunable through adjustment of the central frequency of laser source, capable of achieving lowpass, bandpass or highpass filter. It can be operated in a wide range of optical carrier wavelength. Experimental results show a good notch rejection higher than 20 dB. This scheme could be used in RoF communication systems to reject the channel noise and achieve a better filter performance.

关键词： Notch filters

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