最新刊期
      卷 ， 期 3 ， 2005
      • ZHANG Hui,LI Pei-Yuan,ZHANG Jie,GU Wan-yi
        Issue 3, Pages: 1-3(2005) DOI: 10.13756/j.gtxyj.2005.03.001
        摘要：We firstly described the conception of SLA in ASON, then proposed a scheme of realizing SLA in ASON. We established a mathematical model for it and simulated it at the simulation platform. Furthermore, we analyzed the simulation results and got some conclusions which may provide a reference for readers.  
        关键词：ASON;SLA;network earning   
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      • ZENG Zhi~1,YU Chong-xiu~1,LIU Lei~1,YU Jian-guo~2
        Issue 3, Pages: 4-7(2005) DOI: 10.13756/j.gtxyj.2005.03.002
        摘要：This article theoretically analyzed the relation between the degree of polarization （DOP） and the polarization mode dispersion （PMD） of all orders and the optical pulse width. When the DOP is used in the DGD measurement and works as the control signal for PMD compensation, these factors must be considered comprehensively. This paper also described the effect of DGD and first/second order PMDs on maximum and minimum values of DOP, and the effect of optical pulse width on measuring range of DOP.  
        关键词：degree of polarization（DOP）;polarization mode dispersion（PMD）;differential group delay（DGD）;pulse width   
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      • WU Qian,LEI Fei
        Issue 3, Pages: 8-10(2005) DOI: 10.13756/j.gtxyj.2005.03.003
        摘要：This paper points out that we must consider to calculate the optical signal-to-noise ratio（OSNR） of the longest optical path resulted from protection switching in the design of the optical ring network. A new formula to estimate OSNR for the link with cascaded OADM/OXC nodes in optical network is presented. After comparing a set of OSNR results, we put forward a model for the lowest OSNR under protection switching and a method of designing ring network based on the model, deduce the calculation of OSNR validation in the design of the project.  
        关键词：OXC;OADM;OSNR;EDFA;OADM ring network;protect switch   
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      • CHEN Xuan,HE Dui-yan,LI Hong-tao,ZHANG Ding-chun
        Issue 3, Pages: 11-13(2005) DOI: 10.13756/j.gtxyj.2005.03.004
        摘要：A new solution for burst contention in OBS networks is proposed, and its performance is studied via computer simulation. This solution will greatly reduce the data loss in an OBS network.  
        关键词：OBS;content;buffer queue;proactively scheduling;OPNet   
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      • HOU Rui,SUN Jun-qiang,DING Pan-feng
        Issue 3, Pages: 14-16(2005) DOI: 10.13756/j.gtxyj.2005.03.005
        摘要：Routing loop is one of the most crucial problems that can affect the capability of the MPLS network, but there hasn’t an effect method to detect the loop at the ATM-based MPLS network. This paper introduces some loop solving methods in MPLS firstly, then, according to the characteristics of cells in ATM-based MPLS, promotes a method to detect the loop using the AAL5 cell in ATM.  
        关键词：MPLS;ATM;LSR;LSP;loop detection   
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      • HE Kan,ZHANG Ding-chun
        Issue 3, Pages: 17-20(2005) DOI: 10.13756/j.gtxyj.2005.03.006
        摘要：Label-based all optical networks（AON）represents a very important direction development of next generation networks（NGN）.The most important feature of actualizing label-based AON is its supporting on QoS. This paper emphasizes on the description and discussion of the methods and requirements of actualizing QoS in label-based AON.  
        关键词：QoS;MPLS/MPLmS;LOBS;OLPS   
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      • LI Ming-fang
        Issue 3, Pages: 21-23(2005) DOI: 10.13756/j.gtxyj.2005.03.007
        摘要：This article puts forward a kind of alarm analyzing method based on signal flow. Throught the correlation analysis of the WDM and SDH alarms, we can locate the faults in the WDM network.  
        关键词：WDM;alarm;relativity-analyzing;fault;locate   
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      • XIE Jun~1,FENG Hao~2,JIANG Xu~2
        Issue 3, Pages: 24-27(2005) DOI: 10.13756/j.gtxyj.2005.03.008
        摘要：OTN（Optical Transport Network）is developed with the progress of WDM technology. The standard G.709 （interface for the OTN） was proposed by ITU-T in 2001.Digital wrapper technology was adopted in the recommendation.The frame structure was defined and FEC technology was introduced in the standard too. The frame structure was analysised and the theory of FEC was introduced in this paper.Digital wrapper technology was used in the design of optical transponder unit.The benefits of using FEC technology were verified by experiment.  
        关键词：OTN;FEC;digital-wrapper   
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      • ZHANG Wei,XIAO Ding-zhong,MENG Yu
        Issue 3, Pages: 28-30(2005) DOI: 10.13756/j.gtxyj.2005.03.009
        摘要：As one of the best solutions for FTTH, EPON provides 1 Gbit/s upstream/downstream bandwidth. Multicast can realize efficient P2MP data transmission in IP network, save network bandwidth and reduce network load. With the introduction of all kinds of high-bandwidth services （such as VoD, teleconferencing and distance learning） and multicast technique, EPON will be able to rise to the challenge of various new bandwidth-intensive multimedia services more effectively. We added multicast LLID to EPON, realized a set of LLID multicast mechanism with IGMP snooping and OAM.  
        关键词：EPON;OAM;LLID   
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      • ZHANG Li,ZHANG Ming-lun
        Issue 3, Pages: 31-33(2005) DOI: 10.13756/j.gtxyj.2005.03.010
        摘要：This paper firstly described the multiplexing architecture and carried services of GPON, then discussed the dynamic bandwidth allocation （DBA） in GPON in terms of function, object and process. Lastly, the paper compared the DBA of GPON with that of BPON.  
        关键词：GPON;PON;DBA   
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      • LIU Yuan,ZHANG Jie,GU Wan-yi
        Issue 3, Pages: 34-37(2005) DOI: 10.13756/j.gtxyj.2005.03.011
        摘要：There are two major implementation schemes of Ethernet-ring at present: one is shared Ethernet ring based on L2 switching, the other is embedded RPR-ring. In this paper, technological characteristics of these two schemes are discussed. Then suggestions on solution are given by comparison.  
        关键词：multi-service transport platform（MSTP）;shared Ethernet ring;resilient packet ring（RPR）   
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      • WANG Cheng-yi
        Issue 3, Pages: 38-40(2005) DOI: 10.13756/j.gtxyj.2005.03.012
        摘要：According to the IEEE 802.3 Ethernet protocol, we defined the Ethernet service model that can be operated by provider via adding attributes and parameters related with the services, described it from several aspects of the basic model of the service, the framework structure of the service, the definition of the typical services and the typical application scheme.  
        关键词：MEF;Ethernet service model;Ethernet service framework   
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      • LI Zhen-li
        Issue 3, Pages: 41-43(2005) DOI: 10.13756/j.gtxyj.2005.03.013
        摘要：With the development of broadband networks, the software terminals are widly used in softswitch system, this article analyses the application of SIP terminal in softswitch system, and the realization of SIP terminal.  
        关键词：softswitch;SIP;software terminal   
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      • HU Jia-ni,XU Wei-ran,GUO Jun,DENG Wei-hong
        Issue 3, Pages: 44-46(2005) DOI: 10.13756/j.gtxyj.2005.03.014
        摘要：This paper presents a study of seven feature selection methods that are commonly used in text categorization: document frequency, information gain, mutual information, X\+2 statistic, expected cross entropy, weight of evidence for text, and odds ratio. In order to evaluate these methods, experiments have been carried out combined with Chinese texts set in national 863 project and Rocchio classifier. The results of measured indicate that odds ratio method is superior to other methods.  
        关键词：text categorization;feature selection;evaluation function   
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      • CHEN Wei,LI Jin-yan,LI Shi-yu,LI Hai-qing,JIANG Zuo-wen,CHENG Yu
        Issue 3, Pages: 47-48(2005) DOI: 10.13756/j.gtxyj.2005.03.015
        摘要：In this article, the manufacturing system of microstructure optical fibers was set up, furthermore the feasible technical route for producing microstructure optical fibers was basically formed. Using this technology, we have manufactured total internal reflection（TIR） microstructure optical fibers. The TIR fibers have 9.5 μm core diameter, 9.8 μm effective diameter air hole, and distance between the center of two holes is 12.3 μm, the hydroxyl absorption peak of 1 385 nm is 0.106 dB/m, the attenuation at （1 550 nm） is 0.008 dB/m. From the photos of the microstructure optical fiber obtained by microscope and through CCD sampling to computer, we could find that the air holes are distributed uniformly, what’s more, the micro-holes lattices are just hexagon on the whole.  
        关键词：microstructure;holey;photonic crystal fiber;Process   
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      • Sudipta Bhaumik
        Issue 3, Pages: 49-52(2005) DOI: 10.13756/j.gtxyj.2005.03.016
        摘要：Dynamic fatigue behavior of high strength silica optical fiber was studied as a function of relative humidity of draw environment. Fibers were drawn with graphite induction heating furnace and controlled temperature, relative humidity and particle count of the draw environment i.e. drawing furnace to coating application point. Dynamic fatigue of the drawn fibers were measured with two different modes of loading, tensile & two-point bending. Draw humidity was found to have a decided impact on dynamic fatigue measured by tensile loading.  
        关键词：optical fiber;dynamic fatigue;strength   
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      • DING Shuang-hong,ZHANG Xing-yu,CHANG Jun,WANG Qing-pu,LI Shu-tao,FAN Shu-zhen
        Issue 3, Pages: 53-57(2005) DOI: 10.13756/j.gtxyj.2005.03.017
        摘要：Thulium doped fiber amplifier（TDFA） is the most promising device for the S-band signal amplification, and its research is significant for further broadening the optical communication bandwidth. This paper presents the spectral characteristics of thulium, introduces the commonly used host materials of TDFA, and describes in detail the features of various pumping schemes.  
        关键词：thulium doped;fiber amplifier;S-band amplifier;gain shifting   
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      • YU Zhi-gang,LIAO De-xiang
        Issue 3, Pages: 58-60(2005) DOI: 10.13756/j.gtxyj.2005.03.018
        摘要：This paper describes a new tuning method based on the time domain analysis of responses of filter S11. This method can be used to distinguish the time domain responses originated from the resonators and coupling apertures respectively, guide the adjustment of the resonators and the coupling degree of filters, obtain required response of filters. This method can be used also to observe the mutual effect of the components inside the filters.  
        关键词：coupling resonator;band pass filter;time domain response;tuning;S11 response   
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      • LU Jing~
        Issue 3, Pages: 61-63(2005) DOI: 10.13756/j.gtxyj.2005.03.019
        摘要：On the basis of the electric-control birefringence, we designed the liquid crystal variable optical attenuator （VOA）, analysed its working principle. Moreover, by deriving the VOA’s optical transmission matrix from Jones matrix theory, we obtained the relationship between optical attenuation and voltage. Then we conducted a theoretical simulation and experimental study, the experiment results agree well with the theoretical simulation.  
        关键词：liquid crystal;variable optical attenuator（VOA）;Jones matrix   
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      • LIU Cheng
        Issue 3, Pages: 64-66(2005) DOI: 10.13756/j.gtxyj.2005.03.020
        摘要：Tunable filter is one of the key technology in WDM system. It has important action for developping AON. This paper introduced some tunable filters. They are fiber grating, AOTF, AWG and optic crystal tunable filter etc. Their operational principle and application on WDM have been analysed.  
        关键词：tunable filter;fiber grating;AOTF;AWG;WDM   
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      • ZENG Yun,LIU Wen,CHEN Long,LUO Yong,WU Ke-yu
        Issue 3, Pages: 67-70(2005) DOI: 10.13756/j.gtxyj.2005.03.021
        摘要：This article introduces the tunable optical power splitter developed by Accelink Technologies. It also describes the possible applications of the product in FTTH（Fiber To The Home）, OLP（Optical Line Protection） and some other network architectures.  
        关键词：tunable optical power splitter;FTTH;OLP;">   
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