最新刊期
      卷 ， 期 2 ， 2002
      • MA Ping quan,MAO Qian
        Issue 2, Pages: 1-6(2002) DOI: 10.13756/j.gtxyj.2002.02.001
        摘要：The traditional ADM or DXC will be substituted by a new kind of network element（NE） in network node. This paper introduces the primary function of SDH NE and its atomic function structure.  
        关键词：SDH network element;atomic function;layering structure   
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      • HUANG Li yan
        Issue 2, Pages: 7-10(2002) DOI: 10.13756/j.gtxyj.2002.02.002
        摘要：The standardized network node interface information structure is necessary for networks inter working, it provides the product specifications and design eriteria for equipment manufacturers. The paper introduces optical transport network layered structure and the characteristic information of node interface.  
        关键词：OTN;OTM;ONU   
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      • WANG Yun,ZENG Qing ji,LUO Xuan,YANG Xu dong
        Issue 2, Pages: 11-15(2002) DOI: 10.13756/j.gtxyj.2002.02.003
        摘要：The development of advanced optical networking technology put forward a requirement for a new control plane to implement such functionalities as resource discovery, state information dissemination, path selection, and path management. In this paper, the development and evolution of optical networks are analyzed at first, then the requirements for the unified control plane are put forward, finally, the functional modules and interface properties for the unified control plane are investigated in detail.  
        关键词：IP over WDM;unified control plane;functional modules;interface properties   
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      • HE Gang,ZHANG Jin song
        Issue 2, Pages: 16-20(2002) DOI: 10.13756/j.gtxyj.2002.02.004
        摘要：GMPLS is the extension of MPLS toward optical networks. After briefly presented MPLS technology, This article mainly introduced GMPLS technology which combine IP and optical layers, including the labels, routing & addressing, signaling, link management protocol, etc. of GMPLS.  
        关键词：MPLS;GMPLS;signaling;routing;label   
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      • JIANG Xi jun,SUI Zhi cheng,WU Zhi jian
        Issue 2, Pages: 21-24(2002) DOI: 10.13756/j.gtxyj.2002.02.005
        摘要：Shared protection is an efficient and economic protection scheme. This paper discusses three kinds of shared protection. They all have their own characteristics. Shared protection via OSF is based upon IP network controllers, and it is mainly used in ring network topology. Shared protection by use of OXC is based upon MPLS control plane, and it can be used in any type of topology. Shared protection through appropriate logical topology has application in the design of protected SONET/WDM and IP/WDM networks.  
        关键词：OXC;MPLS;OSF;DCN;LSR;SLSP   
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      • SU Li,JIN De peng,HUANG Fu Wei,ZENG Lie guang
        Issue 2, Pages: 25-29(2002) DOI: 10.13756/j.gtxyj.2002.02.006
        摘要：ATM PON（ATM based Passive Optical Network） is an excellent scheme of access networks. The performances of cell delay and cell delay variation through atm pon access network are studied. The effect of ATM PON media access control protocol on the performances is chiefly analyzed. The conclusion avails to rational designing of MAC protocol.  
        关键词：ATM;PON;CDV;MAC   
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      • CHEN Jian
        Issue 2, Pages: 30-32(2002) DOI: 10.13756/j.gtxyj.2002.02.007
        摘要：According to practical maintance requirements in the transmission equipment room,this article introduces the structure of the transmission circuit management software, the functions of its each module and four basic methods of circuit query.  
        关键词：software development;transmission circuit;management;maintance   
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      • YUAN Rong
        Issue 2, Pages: 33-37(2002) DOI: 10.13756/j.gtxyj.2002.02.008
        摘要：The schematic, gain bandwidth performance and noise figure of distributed Raman amplifier are introduced first. Impact of Raman+EDFA hybrid amplifier on system performance are described then. Several problems on optical transmission system design are indicated. Raman amplifier application is presented at last.  
        关键词：EDFA;distributed Raman amplifier;system design   
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      • HE Wan hui,YIN Xin da
        Issue 2, Pages: 38-40(2002) DOI: 10.13756/j.gtxyj.2002.02.009
        摘要：This paper indroduces some problems met in DWDM system,discusses the applications of the Raman amplifier in these fields.  
        关键词：DWDM;EDFA;Raman amplifier   
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      • WAN Hong Sheng,YI Zhun,DING Tie Qi
        Issue 2, Pages: 41-44(2002) DOI: 10.13756/j.gtxyj.2002.02.010
        摘要：PMD has become the main limiting factors on the high speed long distance optical networks. Firstly this paper analyzed the causes of PMD generation,then it built a theoretical model about PMD .On the basis of these, it described a simultaneous multi channel PMD equalization scheme for all optical DWDM networks.  
        关键词：polarization mode dispersion （PMD）;differential group delay （DGD）;DWDM;state of polarization   
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      • HU Zhong sheng,CHEN Shu fen,QIN Bing kun,Lü Xin
        Issue 2, Pages: 45-47(2002) DOI: 10.13756/j.gtxyj.2002.02.011
        摘要：The origin and characteristic of chirp in external modulator are discussed in this paper. The effect of chirp on dispersion compensation system is analyzed through numerical simulation method. With small negative chirp, electrical eye open penalty （EOP） at the transceiver output end can reduce 0.5dB, which demonstrates that system performance is improved.  
        关键词：optical communication system;numerical simulation;external modulator;chirp;electrical eye open penalty   
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      • WANG Zhi,JIAN Shui sheng
        Issue 2, Pages: 48-51(2002) DOI: 10.13756/j.gtxyj.2002.02.012
        摘要：This paper studies the impacts of structure defect on the transmission characteristics using the software of Fiber Analyses. This research is helpful to understand the fiber transmission characteristics and to control the index profile during fabrication process.  
        关键词：structure defect;transmission characteristics;effective core area（A \%eff\% ）;group velocity dispersion （GVD）   
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      • WAGN Peng,HUANG De xiu,LIU De ming
        Issue 2, Pages: 52-54(2002) DOI: 10.13756/j.gtxyj.2002.02.013
        摘要：In this article, we present a completely new project of DWDM network management design, which is based on the standard structure of network management and applied to education and experimentation. This project combines virtuality with reality organically, which can guarantee the normal operation of network management system and the whole network, as well as open this system to students.  
        关键词：DWDM;network management;virtuality   
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      • SUN Hui gang,CHU Jiu rong,WEN Xu ming,GENG Bao hong,ZHONG Li sheng,XU Chu xiang
        Issue 2, Pages: 55-58(2002) DOI: 10.13756/j.gtxyj.2002.02.014
        摘要：Measuring POF optical attenuation was presented in our paper. The effects of two methods of end face processing on POF optical attenuation were studied. Attenuation spectra of the POF that was produced in our laboratory was measured with the instrument that was based on the methods, the lowest loss was less than 200 dB/km（650 nm）.  
        关键词：plastic optical fiber（POF）;cutback technique;end face processing;hot plate method;attenuation spectra   
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      • DING Guo qing,HU Yi
        Issue 2, Pages: 59-62(2002) DOI: 10.13756/j.gtxyj.2002.02.015
        摘要：The experimental results of three kinds of timing jitters for 2.5 Gbit/s optical receiver modules have been reported, and compared with the nominal jitter value for 2.5 Gbit/s optical telecommunication system specified by ITU T. The main factors and improving methods affecting jitter characteristic have been analysed and discussed.  
        关键词：timing jitter;locked phase loop;input jitter tolerance;output jitter;jitte transmission function   
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