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Dynamic call and connection admission control in automatically switched optical network for grid computing applications

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Science china(information Sciences) 2012年第2期55卷 419-432页

作者： liu lei,guo hongxiang,hong xiaobin,wu jian & lin jintong key laboratory of information photonics and optical communications,ministry of education,beijing university of posts and telecommunications,beijing 100876,china 1. key laboratory of information photonics and optical communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

In recent years,Grid computing applications are becoming more and more important to the scientific and business communities and are likely to open to the consumer market and widely develop in the near future,which is a great challenge brought by the potentially large number of Grid users(perhaps millions)and high frequency of their job *** switched optical network(ASON),which is a promising high capacity intelligent transport network infrastructure,has been already deployed in the world and regarded as a promising solution to foster the expansion of Grid computing from local area networks to wide area ***,by theoretical analysis and simulative evaluation of Grid job blocking in the distributed call and connection setup process of ASON,this paper verifies that ASON and the conventional admission control mechanism confront a problem in supporting future large-scale Grid *** order to address this issue,a novel dynamic call and connection admission control(DCCAC)scheme is proposed to improve the network performance and guarantee quality of service(QoS)of Grid *** scheme is applicable with complete network information,no network information and partial network *** results show that the DCCAC scheme can improve the efficiency of the network to a great ***,all the analysis and algorithms in this paper are based on ITU-T ASON recommendations,which make the DCCAC scheme more applicable in network engineering for future Grid computing.

关键词： automatically switched optical network(ASON) Grid computing blocking probability call admission control connection admission control

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Efficient Mechanisms to Improve TCP Performance over OBS Networks

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china communications 2010年第2期7卷 87-91页

作者： hong xiaobin, Zhou Jun, wu jian, guo hongxiang, Zuo Yong, Xu Kun, lin jintong key laboratory of information photonics and optical communications, ministry of education Institute of optical communications and Optoelectronics, beijing university of posts and telecommunications, beijing 100876, china key laboratory of information photonics and optical communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

Transmission Control Protocol (TCP) performance over optical Burst Switching (OBS) is experimentally investigated on an OBS network testbed, concluding that burst losses will lead to a significant drop in the available TCP bandwidth. Two mechanisms are introduced to improve TCP performance. One is concerning the burst assembly optimization and another is based on the novel assembly and scheduling mechanism to reduce the burst losses.

关键词： OBS ACK TCP burst loss probability scheduling algorithm

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Multi-layer network architecture in support of end-to-end transparent optical connectivities

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Science china(information Sciences) 2011年第3期54卷 674-682页

作者： guo hongxiang , wu jian, hong Xiao Bin & lin Jin Tong key laboratory of information photonics and optical communications, ministry of education, beijing university of posts and telecommunications, beijing 100876, china 1. key laboratory of information photonics and optical communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

In order to effectively accommodate a wide variety of emerging and future applications with diverse requirements, an intelligent optical network capable of the rapid and resilient delivery of on-demand transparent transmission capacity is required. This paper investigates a multi-layer network architecture where a generalized multiple protocol label switching (GMPLS) controlled transparent wavelength switched optical network (WSON), as the transport core, collaborates with multiple client optical burst switching (OBS) networks distributed at the edge. Dynamic interworking mechanism as well as the related signaling/routing protocol ex- tensions for multi-QoS burst streams transmission among different OBS domains are proposed so as to provision an end-to-end (e2e) transparent optical connectivity with on-demand bandwidth to end-users. Moreover, the survivability of this transparent optical connectivity is also addressed. To validate the feasibility of this architecture, an integrated OBS/WSON network testbed was constructed, and stable e2e transparent connectivities were successfully demonstrated for an efficient multi-QoS burst streams transmission.

关键词： multi-layer network transparent optical network OBS WSON GMPLS

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Heterodyne mixing and polarization diversity techniques in radio over fiber system with high sensitivity and dispersion tolerance

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Science china(information Sciences) 2011年第2期54卷 236-243页

作者： XU Kun, YIN Jie, NIU jian, SUN XiaoQiang, wu jian & lin jintong key laboratory of information photonics and optical communications, ministry of education, beijing university of posts and telecommunications, beijing 100876, china 1. key laboratory of information photonics and optical communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

We propose and experimentally demonstrate the heterodyne mixing and polarization diversity tech- niques in radio over fiber (ROF) systems with the advantages of high sensitivity and dispersion endurance. The generation of 2.5 Gb/s optical DPSK and PSK signals, fiber propagation and wireless transmission over 15 GHz subcarrier are illustrated with very low sensitivity of -26 and -32 dBm, respectively. Moreover, based on the wireless polarization diversity techniques, we successfully performed the transmission of 1.3 Gb/s uncompressed high definition television (HDTV) signals with high quality.

关键词： radio over fiber heterodyne mixing polarization diversity

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Integrated LOBS/GMPLS Network Testbed

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china communications 2010年第3期7卷 11-23页

作者： wu jian hong xiaobin guo hongxiang Zhang Wenjia liu lei Takehiro Tsuritani Tomohiro Otani Masatoshi Suzuki lin jintong key laboratory of information photonics and optical communications （ministry of education） beijing university of posts and telecommunications Beijing 100876 P. R. China KDDI R＆D Laboratories Inc. 2-1-15 Ohara Fujimino-shi Saitama 356-8502 Japan

In the context of dynamic telecommunication traffic requirement, experimental prototypes and testbeds have been vital and challenging steps towards achieving practical OBS networks. This paper presents the novel integrated LOBS/GMPLS network testbed. Dynamic interworking technologies between GMPLS network and LOBS network and potential survivability schemes in this multilayer network are investigated by experimentally evaluating the TCP and popular streaming media service performance over an integrated LOBS/ GMPLS testbed.

关键词： LOBS GMPLS testbed

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Generation of 40 GHz phase stable optical short pulses using intensity modulator and two cascaded phase modulators

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Frontiers of Optoelectronics 2011年第3期4卷 292-297页

作者： Yu JI Yan LI Wei LI xiaobing hong hongxiang guo Yong ZUO Kun XU jian wu jintong lin State key laboratory of information photonics and optical communications Beijing University of Posts and Telecommunications

Pulse sources based on lithium niobate modulators are very attractive for optical time division multiplexing(OTDM) transmission systems because the modulators are now commercially available, qualified for system use, and can operate up to very high speeds and over a wide wavelength range. In this paper, we describe the principles of operation and performance of the pulse source based on lithium niobate modulators. The pulse source is based on a Mach-Zehnder intensity modulator(IM) and two phase modulators(PMs). The continuouswave(CW) light is modulated in an IM and then strongly phase modulated in two cascaded PMs. The chirped pulses are subsequently compressed to desired width using dispersion compensation technology. This method has the advantage of acquiring larger chirp using normal PM rather than that special designed PM of very low Vπ. It can also generate shorter pulses than conventional methods incorporating only one PM driving by a radio frequency(RF) signal with the power larger than 1 W which may damage the device. Generation of 40 GHz optical pulses shorter than 2 ps is theoretically illustrated, simulated and experimentally verified. Experimental results show that 40 GHz phase stable optical pulses with pulse-width of 1.88 ps, extinction ratio(ER) larger than 20 dB, the timing jitter of 57 fs and signal-to-noise ratio(SNR) of 32.8 d B can be achieved. This is also a cavity-less pulse source whose timing jitter is determined only by the RF source rather than by the actively controlled cavity. In the experiment, the phase noise of the RF source we used is as low as – 98.13 dBc/Hz at a 10 kHz offset frequency which resulting very low timing jitter of generated *** pulses are then modulated at 40 Gbaud/s with an inphase/quadrature(I/Q) modulator and multiplexed to 160 Gbaud/s with less interference between each *** back-to-back demultiplexing by an electro-absorption modulator(EAM) to 40 Gbaud/s and demodulation by a delay interferometer(DI),

关键词： short pulse intensity modulator phase modulator pulse compression phase stable differential quadrature phase shift keying (DQPSK)

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Dynamically reconfigurable radio-over-fiber network with medium access control protocol to provide network access to train passengers

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Science china(information Sciences) 2013年第10期56卷 134-143页

作者： SHEN Xi XU Kun SUN XiaoQiang wu jian lin jintong State key laboratory of information photonics and optical communications Beijing University of Posts and Telecommunications

An innovative dynamically reconfgurable radio-over-fber(RoF)network equipped with an intelligent medium access control(MAC)protocol is proposed to provide broadband access to train passengers in railway high-speed mobile *** proposed RoF network architecture is based on a reconfgurable control station and remote access unit(RAU)that is equipped with a fxed flter and tunable *** proposed hybrid frequency-division multiplexing/time division multiple access(FDM/TDMA)based MAC protocol realizes failure detection/recovery and dynamic wavelength allocation to remote access *** result shows that with the proposed MAC protocol,the control station can detect failures and recover and dynamic wavelength allocation can increase the wavelength resource utilization to maintain network performance.

关键词： radio over fber medium access control protocol wavelength allocation failure detection failure recovery

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Enabling Technologies for Green Radio-over-Fiber Distributed Anten na System Based Wireless Sensor Network

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china communications 2011年第8期8卷 56-63页

作者：沈希徐坤伍剑林金桐 State key laboratory of information photonics and optical communications Beijing University of Posts and Telecommunications

Novel enabling technologies from physical layer to Medium Access Control (MAC) layer are proposed to provide energy efficient Radio-over-Fiber (RoF) Distributed Antenna System (DAS) based Wireless Sensor Networks (WSN). The power consumption performance of the network is evaluated in terms of the total network power consumption based on the proposed power consumption models from the physical layer. The results illustrate that for a given power consumption value, the tradeoff among the number of Remote Access Units (RAUs), the number of Multiple-Input Multiple-Output (MIMO) antennas and the number of hops must be taken into account. In order to efficiently reduce the total network power consumption, we also proposed a solution from the MAC layer using a sleep-aware MAC protocol, which can dynamically centralized control MIMO antennas to operate in a sleep mode. The proposed enabling technologies provide basis for selecting suitable RoF DAS based WSN and effectively reduce the power consumption.

关键词： RoF DAS WSN power consumption model medium control access protocol

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Non-line-of-Sight Ultraviolet Communication Performance in Atmospheric Turbulence

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china communications 2013年第11期10卷 52-57页

作者：左勇伍剑肖后飞林金桐 State key laboratory of information photonics and optical communications Beijing University of Posts and Telecommunications

Non-line-of-Sight(NLOS)Ultraviolet(UV)communication uses the atmosphere as a propagation *** the communication range increases,turbulence becomes a significant atmospheric process that affects the propagation of optical *** paper presents a more accurate NLOS channel model by considering turbulence-induced Scintillation Attenuation(SA).Then,the Bit Error Rate(BER)during turbulence of the NLOS UV communication system with On-Off keying(OOK)modulation and Maximum Likelihood(ML)detection is analysed and compared with that in free space without *** BER dependence is also analysed for different factors,including the refractive index structure parameter,transceiver range,pointing angles,transmitted power,and data rate.

关键词： ultraviolet communication atmos-pheric turbulence scintillation

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Topological Landau–Zener nanophotonic circuits

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Advanced photonics 2023年第3期5卷 127-134页

作者： Bing-Cong Xu Bi-Ye Xie Li-Hua Xu Ming Deng Weijin Chen Heng Wei Fengliang Dong jian Wang Cheng-Wei Qiu Shuang Zhang lin Chen Huazhong university of Science and Technology School of Optical and Electronic InformationWuhan National Laboratory for OptoelectronicsWuhanChina The Chinese university of hong Kong School of Science and EngineeringShenzhenChina CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology of ChinaNanofabrication LaboratoryCAS Key Laboratory for Nanosystems and Hierarchical FabricationCAS Key Laboratory for Nanophotonic Materials and DevicesBeijingChina National university of Singapore Department of Electrical and Computer EngineeringSingapore university of Chinese Academy of Sciences Center of Materials Science and Optoelectronics EngineeringBeijingChina The university of hong Kong Department of PhysicsHong KongChina Peking university School of PhysicsState Key Laboratory for Mesoscopic PhysicsBeijingChina

Topological edge states(TESs),arising from topologically nontrivial phases,provide a powerful toolkit for the architecture design of photonic integrated circuits,since they are highly robust and strongly localized at the boundaries of topological *** is highly desirable to be able to control TES transport in photonic *** the coupling between the TESs in a finite-size optical lattice is capable of exchanging light energy between the boundaries of a topological lattice,hence facilitating the flexible control of TES ***,existing strategies have paid little attention to enhancing the coupling effects between the TESs through the finite-size ***,we establish a bridge linking the interaction between the TESs in a finite-size optical lattice using the Landau–Zener model so as to provide an alternative way to modulate/control the transport of topological *** experimentally demonstrate an edge-to-edge topological transport with high efficiency at telecommunication wavelengths in silicon waveguide *** results may power up various potential applications for integrated topological photonics.

关键词： topological edge states finite-size effect Landau-Zener model edge-to-edge topological transport nanophotonic integrated circuits

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