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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

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

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)

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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