最新刊期
      卷 ， 期 6 ， 2002
      • YANG Liu 1,MAO Qian 2,HE Yan 2
        Issue 6, Pages: 1-4(2002) DOI: 10.13756/j.gtxyj.2002.06.001
        摘要：The IEEE802.3ah EFM （Ethernet in the First Mile） tast group is now studying EPON.In this paper we firstly describer two methods that emulate EPON to a set of several point to point LANs or shared LANs respectively. Then, we present how to use the ULSLE module in MAC control layer. By means of ULSLE module, you can realize point to point communication in a shared LAN emulation.  
        关键词：access network;LAN;PON;EPON   
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      • CHEN Jie,SUN Shu he,CHEN Xue
        Issue 6, Pages: 5-9(2002) DOI: 10.13756/j.gtxyj.2002.06.002
        摘要：In APON system, one of the key technologies is to dynamically assign bandwidth among different services and guarantee QoS. This paper designs a APON service scheduling algorithm, which realizes the dynamic bandwidth assignment among different service grades through basic bandwidth assignment and surplus bandwidth re assignment. Furthermore, the result of emulation and field test proves that this scheduling algorithm has good performance and feasiblity.  
        关键词：APON;service scheduling algorithm;DBA;service QoS   
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      • SUN Jun
        Issue 6, Pages: 10-14(2002) DOI: 10.13756/j.gtxyj.2002.06.003
        摘要：Fault location is very important for protection of WDM all optical networks. A simple and efficient method based on causation chain and set theory is proposed. We analyze the fault model, prove the fault location formulas, analyze the time and space complexity, and give the detail alarms and faults description for the real equipment.  
        关键词：WDM;all optical networks;fault location   
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      • ZHAO Ji-jun,SUN Yong mei,JI Yue feng,XU Da xiong
        Issue 6, Pages: 15-17(2002) DOI: 10.13756/j.gtxyj.2002.06.004
        摘要：In this paper, we analyze in detail the infrastructure of ASON firstly, then describes its advantages and technologies to be developed. At last we present the development trend and status in quo of ASON.  
        关键词：ASON;optical transport network;control plane   
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      • GUAN Jian 1,LU Hua 2
        Issue 6, Pages: 18-21(2002) DOI: 10.13756/j.gtxyj.2002.06.005
        摘要：This paper presents the background of the evolution of the CWDM technology, gives a thorough analysis of it’s architecture, device involved, size, etc. and compared it with Dense Wavelength Division Multiplexing technology. Its applications in the topologies of point to point, ring and chain are also discussed.  
        关键词：CWDM;capacity upgrading;DWDM   
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      • LIN Qi yin,YANG Sheng li
        Issue 6, Pages: 22-26(2002) DOI: 10.13756/j.gtxyj.2002.06.006
        摘要：Fiber nonlinear effects is a major factor limiting performance of the WDM systems. This paper investigates and compares all kinds of the nonlinear effects on the WDM+EDFA systems, and provides many methods to eliminate the undesired effects. It will be beneficial to system designer.  
        关键词：WDM;EDFA;nonlinear effects;phase matching;stimulated scattering;Kerr effects   
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      • DI Xiao-kang
        Issue 6, Pages: 27-30(2002) DOI: 10.13756/j.gtxyj.2002.06.007
        摘要：This paper systematically analyzes the conception, service types, core components and hierarchical structure of metro optical network, gives the evolution route of metro optical network for incumbent telecommunication carriers. At the same time, considering the NGN network structure, the paper points out that the optical packet switched network is the development trend of future metro optical network.  
        关键词：metro optical network;OADM;OXC;NGN;optical Internet;optical packet switched network   
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      • DONG Hai feng,YANG Shu wen
        Issue 6, Pages: 31-34(2002) DOI: 10.13756/j.gtxyj.2002.06.008
        摘要：The concept of two dimensional optical orthogonal code is expatiated, and its performance is analysed .The paper introduces the design of two dimensional optical orthogonal code fiber delay line encoder and decoder emphatically, and the scheme of the encoder based on fiber grating is presented.  
        关键词：OCDMA;optical orthogonal codes;two dimensional optical orthogonal codes;encoder/decoder   
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      • HAN Qing ming
        Issue 6, Pages: 35-38(2002) DOI: 10.13756/j.gtxyj.2002.06.009
        摘要：Based on the current technology and market informations in the telecommunication industry, this article analyzes the trends for next generation telecommunication networks. It foresees the integration of telecommunication networks, computer networks, and cable TV networks as well as the merging of the technologies, market and the business. It also comments on the development of telecommunication industry in China.  
        关键词：network integration;integration access;integration transmission;integration switch;technology integration;market integration;business integration   
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      • MA Da 1,WU Jian xue 2
        Issue 6, Pages: 39-43(2002) DOI: 10.13756/j.gtxyj.2002.06.010
        摘要：SLA ensures the services of integration, diversification and individualization. Through the introduction of control plane technology based on IP, ASON makes it possible for SLA to be applied in future ASON.  
        关键词：SLA;ASON;control plane   
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      • GUO Xin,JIN De peng,ZENG Lie guang
        Issue 6, Pages: 44-47(2002) DOI: 10.13756/j.gtxyj.2002.06.011
        摘要：This paper introduces the characteristics of SDH pointer leakage ASIC MXTULPx8 5, which is designed independently by the E&E Department of Tsinghua University. The time sliced multiplexing design method is introduced as the key technique, and the tributary elastic buffer size is calculated. The application example of MXTULPx8 5 is also described.  
        关键词：SDH;pointer leakage;ASIC   
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      • TIAN He bin,YANG Tian xin,WANG Yong qiang,ZHOU Jia ning
        Issue 6, Pages: 48-49(2002) DOI: 10.13756/j.gtxyj.2002.06.012
        摘要：The principle, structure and the fabrication process of Er 3+ Yb 3+ co doped glass waveguide amplifiers（EDWA） are introduced, along with their advantages and limitations. Several integrated amplifiers based on EDWA and their application to optical communication field such as metro/access, CATV, etc. are also described.  
        关键词：waveguide amplifiers;EDWA;glass optical waveguides)   
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      • GUAN Wei hua,SHI Guo wu,CHEN Zhang yuan,WU De ming,XU An shi
        Issue 6, Pages: 50-53(2002) DOI: 10.13756/j.gtxyj.2002.06.013
        摘要：In this paper the design and simulation of L band EDFA with 980 nm and 1 480 nm pump in forward pump and bi directional pump structure was proposed.  
        关键词：EDFA;L band;optimum design   
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      • ZHANG Jin song,CAO Ming cui,CHEN Tao,TAN Wei
        Issue 6, Pages: 54-58(2002) DOI: 10.13756/j.gtxyj.2002.06.014
        摘要：The fabric and features of a novel type of optical active component VCSEL is introduced. due to its high performance price ratio, it was applied in single channel and parallel optical interconnection system successfully. It will also used in high speed Ethernet and broadband data communication widely. The VCSEL based optical interconnection and optical switching system with high capacity and parallel processing functions have wonderful applicatrion prospects.  
        关键词：VCSEL;optical interconnection;optical bus;VSR;parallel optical interface   
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      • HOU Rui,HE Dui yan,CHEN Dan
        Issue 6, Pages: 59-62(2002) DOI: 10.13756/j.gtxyj.2002.06.015
        摘要：This paper simply analyzed the loss of rib waveguide using effective index method and modified effective index method, calculated the propagation constant and attenuation constant.  
        关键词：effective index;modified effective index;rib waveguides;attenuation constant   
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      • Issue 6, Pages: 63-66(2002)
          
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