最新刊期
      卷 ， 期 4 ， 2004
      • ZHANG Jin-qi
        Issue 4, Pages: 1-3(2004) DOI: 10.13756/j.gtxyj.2004.04.001
        摘要：An implementation method of a core SONET/SDH switch with high capacity is introduced in the paper. High-speed serial I/O?switching architectures and design considerations for switching unit are involved. It supports strictly non-blocking for unicast traffic and re-arrangeably non-blocking for dual-cast. Dualcast traffic allows for efficient scheduling of working and protection paths in UPSR（Unidirectional Path Switched Ring ）/BLSR （ Bidirectional Line Switched Ring） applications.  
        关键词：switch;non-blocking;T-S-T;signal integrity   
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      • GUI Xuan,ZHANG Jie,GU Wan-yi
        Issue 4, Pages: 4-6(2004) DOI: 10.13756/j.gtxyj.2004.04.002
        摘要：The transmission and process of OA&M（Operation, Administration & Maintenance） information is one of important technologies for intelligent optical network （ION）. This paper firstly analyses the OA&M requirements in ION, in comparison with these requirements in OTN. Then, focusing on three key issues （transmission techniques, process complexity and bandwidth occupation）, we discussed the difficulties in OA&M system implementation. Today’s solutions are compared. Based on this analysis, guidelines to implement OA&M system is presented, including multi-technology transmission, multi-layer process and multi-domain process. Finally, the prototype OA&M system is designed.  
          
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      • ZHANG Peng,Lü Jian-xin
        Issue 4, Pages: 7-9(2004) DOI: 10.13756/j.gtxyj.2004.04.003
        摘要：There are a great deal of high-speed and ultra high-speed signals to be treated in 40 Gbit/s SDH equipment. In this paper the factors that affect signal integrity are studied from the angle of hardware design. It is expatiated in four aspects: power distribution, transmission line design, crosstalk and electro-magnetic interference.  
        关键词：signal integrity;impedance;noise;power distribution;transmission line;crosstalk;electro-magnetic interference   
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      • ZHENG Bi-qing,LIU Hai,LIU De-ming
        Issue 4, Pages: 10-12(2004) DOI: 10.13756/j.gtxyj.2004.04.004
        摘要：This article introduces the technique of using virtual char device and virtual network device in Linux to write EPON device driver, which is simple and easy to implement. Meanwhile, its application and detailed implementation are presented.  
        关键词：virtual device;Linux;driver;EPON   
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      • WANG Jian-ming,CHANG Shi-qiang
        Issue 4, Pages: 13-15(2004) DOI: 10.13756/j.gtxyj.2004.04.005
        摘要：When there are protect switches in the optical network, misconnection may happen if a service channel is ended at a wrong destination node rather than the preplaned one and the network management system don’t correct it. Misconnection results from share protection and wavelength reuse. Lightpathes of WDM ring using share protect and wavelength reuse will be easy to misconnect when multi-fiber-fault or node-fault happen. In this paper we propose a solution to check and prevent the misconnection.  
        关键词：misconnection;WDM ring;wavelength reuse   
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      • ZHOU Fang,LI Wen-yao
        Issue 4, Pages: 16-17(2004) DOI: 10.13756/j.gtxyj.2004.04.006
        摘要：This paper briefly introduces the realization process of Ethernet over SDH, then makes a further discussion about the circuit design on EOS.  
        关键词：Ethernet;SDH;LAPS;chip design   
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      • LI Yan-jun~1,HONG Xiao-bin~1,YU Jian-guo~2,WU Jian~1,LIN Jin-Tong~1
        Issue 4, Pages: 18-22(2004) DOI: 10.13756/j.gtxyj.2004.04.007
        摘要：As a new optical switching technology, optical burst switching is more efficient and has shorter delay than circuit switching, and it is more feasible than optical packet switching, in this paper, we discuss some key technical details about OBS based on JET（Just Enough Time） protocol, including burst assembly,quality of service and the concrete format of control packet and burst packet, etc.  
        关键词：optical burst switching;JET;QoS;frame format   
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      • OUYANG Qing-rong,YU Hou-quan
        Issue 4, Pages: 23-25(2004) DOI: 10.13756/j.gtxyj.2004.04.008
        摘要：The basic demand on implementation of SIP is investigated,a kind of implementation of message receiving and sending in SIP stack is proposed. With multi-thread, HASH table and mechanism of "exponential attenuation" retransmission like TCP, efficiency, reliability and concurrent processing are achieved.  
        关键词：SIP stack;message receiving and sending;multi-thread;HASH table   
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      • JIANG Guo-zhou~
        Issue 4, Pages: 26-28(2004) DOI: 10.13756/j.gtxyj.2004.04.009
        摘要：In a switched LAN, the best place for RMON agent, which can monitor all the flux in a net segment, is inside of the switch. In this paper, the function of RMON is introduced, then the factors of the cost is discussed, and an optimized method of design which can fulfill the functions of all the group of RMON in the switch network is also given.  
        关键词：switched LAN;RMON agent;distributed RMON   
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      • MENG Yu~1,JIANG Tao~2,XIAO Ding-zhong~2,HE Yan~2
        Issue 4, Pages: 29-31(2004) DOI: 10.13756/j.gtxyj.2004.04.010
        摘要：EPON（Ethernet passive optical network） is an important technology for the broad-band and multi-service access in the future. The hardware implementation schemes of upstream slot allocation are proposed in this paper. Conversion of results of DBA into access time is carried out; meanwhile, based on the "grabbing" scheme, auto discovery is achieved.  
        关键词：EPON;upstream access;registering;grabbing scheme;hardware implementation   
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      • WANG Zhi-feng,ZHOU Xi-kang,WEI Xue-qin
        Issue 4, Pages: 32-35(2004) DOI: 10.13756/j.gtxyj.2004.04.011
        摘要：In this paper, the developments of the event management of cross threshold are discussed. Then, a new solution of the event management of cross threshold is presented for the practicability of network maintenance and implementation. Finally, a detailed study is provided.  
        关键词：equipment management function;performance management;threshol   
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      • ZHAO Hui~1,LIU Yun-hong~2
        Issue 4, Pages: 36-37(2004) DOI: 10.13756/j.gtxyj.2004.04.012
        摘要：The maintenance of local area network is a tedious work, which requires long-term experience and knowledge accumulation. This article briefly presented the knowledge of local area network, analyzed the problems which frequently appeared in the network maintenance, and gave the solution;This article also gave a brief introduction to routine maintenance.  
        关键词：local area network;net card;hub;agreement   
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      • YANG Guang-qiang,SONG Ji-en,GUO Yong,HUANG Yong-qing,REN Xiao-min
        Issue 4, Pages: 38-40(2004) DOI: 10.13756/j.gtxyj.2004.04.013
        摘要：The dispersive properties of the single and cascaded fiber gratings have been discussed and analyze.A transmission-based dispersion compensator employing cascaded fiber gratings for dispersion compensation of multiple channels WDM lightwave systems has been proposed correspondingly in the paper.The results show that the effective compensation can be achieved if the parameters of cascade fiber gratings are chosen carefully.  
        关键词：fiber grating;cascaded fiber gratings;dispersion compensation;WDM   
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      • WANG Tie-jun~
        Issue 4, Pages: 41-43(2004) DOI: 10.13756/j.gtxyj.2004.04.014
        摘要：WDM transmission system is working in both C and L to increase the transmission capacity. Dispersion compensation fiber and module for C+L band is a key device for long haul and high bit rate transmission. With plasma chemical vapor deposition process, we fabricate dispersion compensation fiber for identical compensation in C+L band.  
        关键词：C+L band;dispersion compensation;dispersion slope compensation   
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      • GENG Bao-hong,WANG Bin,ZHONG Li-sheng,XU Chuan-xiang
        Issue 4, Pages: 44-46(2004) DOI: 10.13756/j.gtxyj.2004.04.015
        摘要：The effect of temperature on attenuation of polymer optical fiber（POF） in the circumstance of our experiment is discussed through the analysis of the result obtained from experiment and DSC curve of POF’s material .Then the relation between factors affecting attenuation of POF and temperature is analyzed to approve our conclusion in theory.  
        关键词：polymer optical fiber;attenuation;DSC   
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      • HU Xian-zhi
        Issue 4, Pages: 47-50(2004) DOI: 10.13756/j.gtxyj.2004.04.016
        摘要：First, this paper introduces the manufacturer methods and properties of the graded index plastic optical fiber （GI-POF） in detail. Then, the paper gives the polymer optical fiber properties and the test methods of polymer optical fiber cables and the newest development of the data transmisson over the graded index plastic optical fiber.  
        关键词：plastic optical fiber;attenuation;bandwidth;test methods   
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      • CHONG Ying-zhe,ZHANG Xia,REN Xiao-min
        Issue 4, Pages: 51-53(2004) DOI: 10.13756/j.gtxyj.2004.04.017
        摘要：MOF （Microstructure Optical Fibers） is a newly emerged research area. Based on the special features resulted from the microstructures in the cladding, MOFs can not only become a kind of excellent transmission media, but also be applied to many new types fiber devices. This paper reviews the recent major experiments of using MOFs both in optical transmission and fiber devices.  
        关键词：MOF;optical fiber communications;optical fiber devices   
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      • WANG Zhen-kai,CHEN Jian-ya,GU Wan-yi
        Issue 4, Pages: 54-57(2004) DOI: 10.13756/j.gtxyj.2004.04.018
        摘要：Most optical packet buffers are constructed with FDLs（Fiber Delay Lines）. However, the FDL efficiency, i.e. the ratio of total FDL length to buffer depth is rather low in current optical buffer designs （normally 2/N,where Nis the number of input port）. In this paper, two novel FDL structures, linear structure and tree structure, are proposed to substitute equivalent while wasteful FDL modules. The substitution can be made in many optical buffer designs and improve the FDL efficiency to a constant value or 1/log2 N,resulting in significant FDL economizing.  
        关键词：all optical buffer;fiber delay line;FDL efficiency   
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      • CHEN Si-xiang~1,SUN Xiao-bin~1,ZHOU Fang~2,LIU Wen~1
        Issue 4, Pages: 58-60(2004) DOI: 10.13756/j.gtxyj.2004.04.019
        摘要：This paper gave the designing principle of temperature-insensitive AWG is described, and some tentative methods, such as large negative thermal-optical coefficient polymer as filling material of trench on slabs or arrayed waveguides, bimetal stress compensation, and input- waveguide movement for temperature compensation.  
        关键词：AWG;athermal AWG;MUX/DEMUX;PLC   
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      • CAO Li~1,JIANG Shan~1,WANG Ding-li~1,YE Lei~2
        Issue 4, Pages: 61-63(2004) DOI: 10.13756/j.gtxyj.2004.04.020
        摘要：High-speed directly modulated laser diodes are key components in local area network （LAN） and metropolitan area network（MAN）. This paper talks about the factors that affect the bandwidth of the laser diodes. In addition, some methods for improving the modulation bandwidth of the laser diodes are discussed.  
        关键词：directly modulation;quantum dot;strain;p-doped;parasitics   
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      • TONG Jian-nong,ZOU Xue-cheng,SHEN Xu-bang
        Issue 4, Pages: 64-66(2004) DOI: 10.13756/j.gtxyj.2004.04.021
        摘要：The finite element error analysis using Boltzmann modeling MOSFET is investigated. The physics and modeling indicate that the disturbed errors come from the refine mesh of FEA.  
        关键词：finite element analysis;error analysis;vertical nMOSFET;SOI   
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      • LI Ying,JIANG Xiao-qing,LI Xi-hua,WANG Ming-hua
        Issue 4, Pages: 67-70(2004) DOI: 10.13756/j.gtxyj.2004.04.022
        摘要：Variable optical attenuator（VOA）is a key power controlling device which can realize channel equalization and automatic gain control（AGC）. Owing to common characteristic of wide dynamic range, low power consumption, compactness and convenience of integration, micro-electromechanical system（MEMS） and thermooptic are important techniques for VOA. Polymer with optimum thermooptic coefficient became the most attractive thermooptic materials. We classified the presented VOA firstly. Various MEMS-type VOA were introduced. We also summarized the developments of polymer, and from the angle of thermooptic material, emphasized on the analysis of various polymer-based thermooptic VOA. Two application instances in optical network were presented lastly.  
        关键词：VOA;MEMS;thermooptic effect;polymer   
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