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2012 9th International Symposium on Wireless communication systems, ISWCS 2012

作者： Liu, Huaping Sun, Fan Thai, Chan Dai Truyen De Carvalho, Elisabeth Popovski, Petar State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University China Department of Electronic Systems Aalborg University Denmark

ISBN: (纸本)9781467307604

Consider a wireless network with multiple sources and destinations, where the amount of data of each source node is finite. An interesting question is what is the shortest completion time, i. e. the time required that all data from the sources gets to the respective destinations. A similar question arises for the minimal required energy. While the requirement for minimal energy consumption is obvious, the shortest completion time is relevant when certain multi-node network needs to reserve the wireless medium in order to carry out the data exchange among its nodes. The completion time/energy consumption required for multiple flows depends on the current channel realizations, transmission methods used and, notably, the relation between the data sizes of different source nodes. In this paper we investigate the shortest completion time and minimal energy consumption in a two-way relay wireless network. The system applies optimal time multiplexing of several known transmission methods, including one-way relaying and wireless network coding (WNC). We show that when the relay applies Amplify-and-Forward (AF), both minimizations are linear optimization problems. On the other hand, when the relay uses Decode-and-Forward (DF), each of them is a quadratic optimization problem. The results show that, for given channel realizations, there is an optimal ratio of the data packets at the sources to obtain minimal completion time or energy consumption. This can be used as a guidance for the nodes to apply traffic shaping. In most cases, DF leads to shorter completion time and energy consumption compared to AF. © 2012 IEEE.

关键词： Energy utilization

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Adaptive modulation and coding for two-way amplify-and-forward relay networks

Adaptive modulation and coding for two-way amplify-and-forwa...

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2012 1st IEEE International Conference on communications in China, ICCC 2012

作者： Yang, Kun Song, Lingyang State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electrical Engineering and Computer Science Peking University Beijing China

ISBN: (纸本)9781467328159

In this paper, we introduce an adaptive modulation and coding protocol for all-participate amplify-and-forward relay network systems to achieve a better overall system performance. In the proposed scheme, all the relays are available and have chances to amplify and forward (AF) the signal candidates to the terminals, and for fairness all the relays submit to the same power limitation for the signal amplification. The two source nodes adaptively choose the appropriate modulation and coding scheme based on the information from the feedback channels to ensure that the block error rate (BLER) of the relay system is under the system requirement. Furthermore, we derive closed form expressions for the system performances over Rayleigh Channels, including average spectral efficiency and average BLER. Numerical results show that the analytical results figure out the system performance asymptotically. © 2012 IEEE.

关键词： Spectrum efficiency

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Modal interferometer based on tapering single-mode-multimode-single-mode fiber structure by hydrogen flame

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中国光学快报（英文版） 2012年第7期10卷 32-34页

作者： Ying Zhang Weiwen Zou Xinwan Li Jingwei Mao Wenning Jiang Jianping Chen The State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China

A modal interferometer is experimentally demonstrated based on tapering a single-mode-multimode-singlemode (SMS) fiber structure heated by hydrogen *** interference fringe begins to form when tapering length is 19.8 mm,and becomes regular and clear when the tapering length is longer and the tapered waist diameter is *** process is undertaken to achieve a high extension ratio of approximately 17 dB with free spectral range of 1.5 nm when the tapering length is 33 mm and the tapered waist diameter is approximately 5 μ*** temperature and axial strain dependences of the tapered SMS structure are characterized,and the measured temperature and strain coefficients are +7 pm/℃ and -9.536 pm/με,respectively.

关键词： 060.2340 Fiber optics components 130.3990 Micro-optical devices 230.4000 Microstructure fabrication

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Auto discovery for optimizing the connection set up time in network restoration for OFDMA-PONs

Auto discovery for optimizing the connection set up time in ...

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National Fiber Optic Engineers Conference, NFOEC 2012

作者： Li, Chengjun Guo, Wei Jin, Yaohui Sun, Weiqiang Hu, Weisheng Xia, Ming State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University China Ericsson Research United States

Three ONU auto-discovery schemes are proposed to reestablish connections between ONUs and OLT in network failure restoration for OFDMA-PONs. Simulation is conducted to compare the performances of these schemes. ©... 详细信息

ISBN: (纸本)9781557529350

关键词： Orthogonal frequency division multiplexing

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Simulation on high-speed all-optical pattern recognition using SOA-MZIs

Simulation on high-speed all-optical pattern recognition usi...

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2012 17th Opto-Electronics and communications Conference, OECC 2012

作者： Wu, Cen Yang, Xuelin Weng, Qiwei Hu, Weisheng State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Department of Electronic Engineering Shanghai 200240 China

We simulated for the first time an all-optical binary pattern recognition system incorporating three SOA-based gates at 40 Gb/s. The results are in good agreement with the reported experimental demonstration. © 2... 详细信息

ISBN: (纸本)9781467309776

关键词： Pattern recognition

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Mitigation of reflection-induced crosstalk in multi-wavelength TDM-PON using spectral red-shifted, tunable fiber ring laser based upstream source

Mitigation of reflection-induced crosstalk in multi-waveleng...

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optical Fiber communication Conference, OFC 2012

作者： Li, Zhengxuan Yi, Lilin Zhang, Yan Dong, Yi Xiao, Shilin Hu, Weisheng State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Department of Electronic Engineering Shanghai 200240 China

We proposed a gain-saturated RSOA and TOF based spectral red-shifted, directly-modulated tunable fiber ring laser as upstream laser source to suppress the reflection-induced crosstalk in a single-fiber bidirectional m... 详细信息

ISBN: (纸本)9781557529381

关键词： Crosstalk

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Feasibility of optical technologies for packet switching networks

Feasibility of optical technologies for packet switching net...

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2012 21st Annual Wireless and optical communications Conference, WOCC 2012

作者： Hu, Weisheng Sun, Weiqiang He, Hao Jin, Yaohui Xiao, Shilin State Key Lab. of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Minhang district Shanghai 200240 China

ISBN: (纸本)9781467309394

optical packet switching (OPS) has been the premier choice for the future Internet. After the effort of OPS researches, however, big challenges still remain unsolved, which include fast tunable wavelength conversion, optical switch fabrics at large dimension, high-speed burst-mode transceiver, random access optical buffers, photonic integration. In this paper, we will elaborate on some technical challenges in realizing the OPS test-bed. © 2012 IEEE.

关键词： optical switches

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optical network unit design for TWDM-PON

Optical network unit design for TWDM-PON

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Information Optoelectronics, Nanofabrication and Testing, IONT 2012

作者： Yi, Lilin Li, Zhengxuan Dong, Yi Xiao, Shilin Hu, Weisheng State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Department of Electronic Engineering Shanghai 200240 China

We report our recent progresses on proposing a cost-effective time and wavelength division multiplexed passive optical network (TWDM-PON), especially on the design of the high performance and low cost optical network ... 详细信息

关键词： Cost effectiveness

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An OFDMA-PON architecture supporting flexible all-optical VPN with source-free ONUs

An OFDMA-PON architecture supporting flexible all-optical VP...

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2012 Photonics Global Conference, PGC 2012

作者： Zhuang, Zhiming Xu, Mu Wu, Jiayang Cao, Pan Hu, Xiaofeng Wang, Tao Su, Yikai State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China

ISBN: (纸本)9781467325165

We propose and experimentally demonstrate a new orthogonal frequency division multiple access-based passive optical network (OFDMA-PON) architecture supporting flexible all-optical virtual private network (VPN) with source-free optical network units (ONUs). In our scheme, variable-bit-rate VPN communications are achieved. Moreover, based on optical sideband reuse at the ONU side and optical carrier suppression (OCS) at the optical line terminal (OLT), the ONUs are source-free and components for the operation of frequency shift are eliminated. © 2012 IEEE.

关键词： Virtual private networks

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A simple and accurate timing synchronization algorithm for IMDD optical OFDM

A simple and accurate timing synchronization algorithm for I...

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2012 17th Opto-Electronics and communications Conference, OECC 2012

作者： Hao, Chenxi Yang, Xuelin Bi, Meihua He, Hao Hu, Weisheng State Key Lab. of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China

A simple timing synchronization algorithm is proposed for IMDD optical OFDM. Accurate timing synchronization is demonstrated by simulations and experiments, with lower computation complexity. © 2012 IEEE.

ISBN: (纸本)9781467309776

关键词： Timing circuits

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