最新刊期
      卷 ， 期 2 ， 2000
      • ZHANG Xuan,YANG Zhu
        Issue 2, Pages: 1-3(2000) DOI: 10.13756/j.gtxyj.2000.02.001
        摘要：The first 10 Gbit/s system transmission experiment over 793.2 km G.652 fiber in China is described in this paper. The experiment uses the transmitting and receiving devices developed by WRI, 10 EDFAs and 720 km dispersion compensation fiber （DCF）. As the result indicates, At BER =10\+\{-12\}, the sensitivity can reach -18.8 dBm, and the channel cost is 0.4 dB.  
        关键词：Gbit/s optical fiber transmission system;\ EDFA;\ DCF   
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      • Issue 2, Pages: 4-7(2000) DOI: 10.13756/j.gtxyj.2000.02.002
        摘要：The cost of using WDM to expand local area optical network is analyzed. In the case of shorter distances between the loop nodes,the cost of network expansion through WDM isn’t be less than that of expansion through installation of new cables. But with fixed distances between nodes,the cost will decrease with the increase of number of optical paths.In addition, it will be difficult to save cost if the price of WDM equipments can’t decrease simultaneously with that of optical cables.  
        关键词：WDM;LAN;node;cost   
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      • WU Cui xian,GUO Jun neng,CHEN Ji nu
        Issue 2, Pages: 8-12(2000) DOI: 10.13756/j.gtxyj.2000.02.003
        摘要：This paper discusses the following issues from network layer and the higher layer of the WDM based network:traffic grooming algorithms to minimize the cost of electronic multiplexing;joint optical and elctronic protection mechanisms; the impact of the optical topology on higher layer protocols such as IP routing ,TCP flow control and multi layer switching.  
        关键词：WDM;traffic grooming;wavelength assignment;protection and restoration;TCP.   
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      • CHEN Ya hua,LIU Jin gao
        Issue 2, Pages: 13-17(2000) DOI: 10.13756/j.gtxyj.2000.02.004
        摘要：In this paper, we describe the architecture of passive optical access network incorporating WDM（WDMPON）, discuss its key techniques of downstream transmission and upstream transmission. The general features are analyzed, the advantages and shortages of PSPON and WDMPON are also compared.  
        关键词：WDM;PON;OLT;ONU;upstream channel;downstream channel   
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      • TIAN Yun
        Issue 2, Pages: 18-21(2000) DOI: 10.13756/j.gtxyj.2000.02.005
        摘要：The capability of cross connection is one of the most important guide line in SDH. It greatly depends on the design of Very Large Scale Integration（VLSI） for cross connect. So , the ASIC center in Wuhan Reserch Istitute of Posts and Telecommunications has developed the WGS1608 with Fujitsu 0.35 μm technology. （its size is 220 000 gates）, and has succeeded after the first NRE. In the design ,we have used VHDL、VERILOG language , TOP DOWN flow . This text introduces the design goals, structure,feature and method of use of WGS1608.  
        关键词：ASIC;cross connect;SDH;VLSI   
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      • SHA Yan ping,ZENG Lie guang
        Issue 2, Pages: 22-25(2000) DOI: 10.13756/j.gtxyj.2000.02.006
        摘要：The design of high speed SDH frame aligner is introduced in this paper, and the relation between frame aligner performances and the parameters is also analyzed. Based on above analysis, the STM 4 frame codes are selected and a parallel frame aligner design is devised.  
        关键词：frame aligner;SDH;STM   
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      • SHI Xiao chun,SUN Xiao han,HUANG Hai feng,ZHANG Ming de,DING Dong
        Issue 2, Pages: 26-29(2000) DOI: 10.13756/j.gtxyj.2000.02.007
        摘要：In this paper, a design scheme of configuration software based on self adaptive transmission and priority transmission is presented. A communication software which can implement both image and control data transmission in multimedia fiber monitor & control system is developed, The results of the transmission experiment show that the configuration software can solve the problem of real time monitor & control for MFMC systems.  
          
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      • CHI Hao,ZHANG Xian min,CHEN Kang sheng
        Issue 2, Pages: 30-34(2000) DOI: 10.13756/j.gtxyj.2000.02.008
        摘要：As shared media networks, APON need media access control protocol that arbitrates the access to upstream bandwidth. The authors present a new MAC protocol for APON system that conforms to the ITU T recommendation. The time delay prioritization improves the performance of the access system. To decreasing cell delay variation, the requests of high delay priority service are distributed at equal intervals. And low priority requests distribution follows the simple sequential way. The upstream frame length varies with the number of linking users and the bandwidth request minislots are dynamically allocated by system among the terminations. The computer simulation results approve the network performance evaluation.  
        关键词：APON;MAC protocol;access network   
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      • FENG Jian he,CHEN Shu qiang,GUAN Ke jian
        Issue 2, Pages: 35-39(2000) DOI: 10.13756/j.gtxyj.2000.02.009
        摘要：A high performance tunable semiconductor fiber ring laser（SFRL） with turnable range of 40 nm is designed. Using the nonlinearity of FWM in the semiconductor optical amplifier （SOA）, we realised a wavelength conversion of 2.5 Gbit/s SDH optical signal （8.24 nm up and 19.49 nm down） without external pump source.  
        关键词：all optical wavelength conversion（AOWC）;semiconductor optical amplifier（SOA）;four wave mixing（FWM）;semiconductor fiber ring laser（SFRL）   
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      • FANG Lai fu,ZHAN Jie,LIU Xue yuan,LIN Jin feng,GU Wan yi
        Issue 2, Pages: 40-44(2000) DOI: 10.13756/j.gtxyj.2000.02.010
        摘要：Virtual wavelength path is very important for making full use of bandwidth resource of WDM optical network and the wavelength converter is the key to realize the virtual wavelength path. This letter introduces the present all optical wavelength converters such as XGM、XPM and FWM, makes comprehensive classification and comparision, and deply analyses their advantages and disadvantages.  
        关键词：all optical wavelength converter（AOWC）;XGM;XPM;FWM   
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      • XU Jian,CHEN Ru quan,LIN Hong rong
        Issue 2, Pages: 45-48(2000) DOI: 10.13756/j.gtxyj.2000.02.011
        摘要：The effects of self phase modulation（SPM） on optical pulse in positive or negative dispersion fiber are analyzed. Then the influence of SPM on performance of dispersion compensation system which uses dispersion compensation fiber is simulated, and some useful conclusions are obtained for practical systems.  
        关键词：fiber dispersion;self phase modulation;dispersion compensation   
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      • LIN Ning,ZHANG Xiao guang,YU Zhong yuan,YANG Bo jun
        Issue 2, Pages: 49-54(2000) DOI: 10.13756/j.gtxyj.2000.02.012
        摘要：We demonstrated the pulse compression in optical fiber using optical fiber linearly chirped gratings. Firstly the dispersion characteristics of the optical fiber linearly chirped gratings are discussed, Secondly the simple rule is given for designing the optical fiber linearly chirped gratings to compress the optical pulse theoretically and numerically. Finally using the rule a optical fiber linearly chirped grating compressor with compression factor=10 is simulated by computers.  
        关键词：optical fiber linearly chirped grating;pulse compression;dispersion;self phase modulation   
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      • PEI Li,JIAN Shui sheng
        Issue 2, Pages: 55-58(2000) DOI: 10.13756/j.gtxyj.2000.02.013
        摘要：This paper describes the optimize design of LiNbO\-3 M Z interference intensity modulator coplanarity waveguide electrode （symmetry trio electrode）, including the optimal design of width, space, thickness and length of the electrode.  
        关键词：LiNbO3M-Z interference intensity modulator;electrode;optimal design   
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      • Issue 2, Pages: 58(2000)
          
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      • Issue 2, Pages: 59-60(2000) DOI: 10.13756/j.gtxyj.2000.02.014
          
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      • Issue 2, Pages: 61(2000) DOI: 10.13756/j.gtxyj.2000.02.015
          
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      • Issue 2, Pages: 62(2000)
          
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      • Issue 2, Pages: 62(2000)
          
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