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Active-fault-alarm based pre-restoration mechanism in MPLS-TP optical network

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The Journal of china Universities of posts and telecommunications 2010年第3期17卷 97-103页

作者： BAI Hui-feng, LU Yue-ming, JI Yue-feng key laboratory of information photonics and optical communications, ministry of education, 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

The newly developed multi-protocol label switching transport profile （MPLS-TP） fails to actively alarm the fault in advance when conducting restoration in network, or to avoid the false-alarm when equipped with the active-fault-alarm （AFA） to support carrier-grade reliability. In order to solve this problem, a new AFA based pre-restoration mechanism （AFABPRM） is proposed for MPLS-TP controlled optical network, along with the three levels quality-of-service （QoS） based shortest path first rerouting algorithm （TQ-SPF） in this article. The AFABPRM takes full advantage of the AFA technologies, and can solve the false-alarm problem. Analytical and experimental results suggest the better performances of the new mechanism when compared restoration mechanism with or without AFA function, and show that the AFABPRM can solve the false-alarm problem efficiently.

关键词： MPLS-TP restoration AFA

Analysis and experimentation of key technologies in service-oriented optical internet

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Science china(information Sciences) 2011年第2期54卷 215-226页

作者： JI YueFeng, REN DanPing, LI Hui, LIU XueJun & WANG ZhengZhong key laboratory of information photonics and optical communications, ministry of education, 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 China

To satisfy diverse bandwidth-intensive applications envisioned in the internet of the future, research on a distributed optical internet, enabling efficient utilization of geographically distributed resources, has become attractive. The deployment of such a network, however, has its own technical challenges, including network architecture, resource management, and high-speed transmission. To address these issues, a service-oriented-architecture-based distributed optical internet architecture is proposed. Thereafter, key technologies of an optical internet, such as optical multicasting, distributed resource control, and high-speed transmission, are analyzed and investigated. The proposed schemes are verified through experimentation and simulation.

关键词： optical internet service-oriented distributed optical networks optical multicasting optical transmission

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 key laboratory of information photonics and optical communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 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

Strain distribution and electronic structures of the InAs/GaAs quantum ring molecule in an applied electric field

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Science china(Physics,Mechanics & Astronomy) 2010年第9期53卷 1594-1599页

作者： JIA BoYong,YU ZhongYuan,LIU YuMin,YAO WenJie,YE Han & FENG Hao key laboratory of information photonics and optical communications(beijing university of posts and telecommunications),ministry of education,beijing 100876,china ministry of education Key Laboratory of Information Photonics and Optical Communications (Beijing University of Posts and Telecommunications) Beijing China

The strain distribution and electronic structures of the InAs/GaAs quantum ring molecule are calculated via the finite element *** our model,three identical InAs quantum rings are aligned vertically and embedded in the cubic GaAs *** the band edge modification induced by the strain,the electronic ground state and the dependence of ground state energy on geometric parameters of the quantum ring molecule are *** change of localization of the wavefunction resulting from the applied electric field along the growth direction is *** ground state energy decreases as the electric field intensity increases in a parabolic-like *** electric field changes the monotonic dependence of the energy level on the inter-ring distance into a non-monotonic ***,the electric field has no effect on the relationships between the energy level and other geometric parameters such as the inner radius and outer radius.

关键词： strain distribution electronic structure quantum ring molecule applied electric field

Generalized quantum state sharing of the arbitrary two particles state

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Science china(Physics,Mechanics & Astronomy) 2010年第11期53卷 2064-2068页

作者： WANG Chuan 1,2,ZHANG Yong 1,2 & JIN GuangSheng 1,2 1 School of Science,beijing university of posts and telecommunications,beijing 100876,china 2 key laboratory of optical communication and Lightwave Technologies,beijing university of posts and telecommunications,beijing 100876,china School of Science Beijing University of Posts and Telecommunications Beijing China key laboratory of optical communication and Lightwave Technologies Beijing University of Posts and Telecommunications Beijing China

This paper has proposed a generalized quantum state sharing protocol of an arbitrary two-particle state using non-maximally GHZ states and generalized Bell state *** sender Alice performs two-particle generalized Bell state measurements on her two particles in the state sharing process and the controller takes measurements on his particles and transfers the quantum information to the receiver with entanglement swapping by the cooperation of the other *** is found that the use of nonmaximally entangled state in quantum state sharing has enabled the secure sharing of the quantum state.

关键词： quantum state sharing quantum entanglement arbitrary two particles state

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 key laboratory of information photonics and optical communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 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 key laboratory of information photonics and optical communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 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

Calculation of valence band structures of InAs/GaAs quantum ring and quantum dot:using numerical Fourier transform method

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The Journal of china Universities of posts and telecommunications 2010年第1期17卷 106-110页

作者： JIA Bo-yong,YU Zhong-yuan,LIU Yu-min,TIAN Hong-da key laboratory of information photonics and optical communications,ministry of education,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

This article puts forward a new method in calculating the band structures of low-dimensional semiconductor structures. In this study, the valence band structures of InAs/GaAs quantum ring and lens-shaped quantum dot are calculated with four-band model, in the framework of effective-mass envelope function theory. To determine the Hamiltonian matrix elements, this article develops the numerical Fourier transform method instead of the widely used analytical integral method. The valence band mixing is considered. The hole energy levels change dramatically with the geometrical parameters of the quantum ring and quantum dot. It is demonstrated that numerical Fourier transform method can be adopted in low-dimensional structures with any shape. The results of Fourier transform method are consistent with the ones of analytical integral in literature; and they are helpful for studying and fabricating optoelectronic devices.

关键词： valence band structures quantum ring quantum dot numerical Fourier transform

VCO clock synchronization loop combined with dispersion equalization in optical coherent receivers

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The Journal of china Universities of posts and telecommunications 2010年第5期17卷 122-128页

作者： FAN Yang-yang,CHEN Xue,ZHOU Xian,ZHOU Wei-qin,ZHU Hai,LI Zhi-yu key laboratory of information photonics and optical communications,ministry of education,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

In optical coherent receivers,the timing error detector （TED） in synchronization loop can not work normally when signal is distorted by large *** paper proposes a novel clock synchronization scheme which adds a butterfly-structured adaptive equalizer to the loop to fulfill synchronizations,equalizations and polarization de-multiplexing of two polarization states simultaneously under the control of single voltage-controlled oscillator （VCO）.Simulink simulation demonstrates the rationality and the feasibility of the combined loop with single VCO.

关键词： optical coherent receiver synchronization dispersion equalization