最新刊期
      卷 ， 期 4 ， 1990
      • Zhang Xu
        Issue 4, Pages: 1-9(1990) DOI: 10.13756/j.gtxyj.1990.04.001
        摘要：The paper suggests to consider synchronous optical fiber communication network with new digital hierarchy; to fully utilize the installation of optical amplifiers in eliminating the use of regenerative repeater; to encourage the trial applications of densely packed multiple optical carrier systems and coherent communication systems on toll lines, and to accelerate the research on optoelectronic integration technology.The object of all these developments is to fully exploit the huge potential capacity of the optical fiber,as well as to reduce the quantity of hardware components so as to ensure high system reliability.  
          
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      • Wang Guangzhong
        Issue 4, Pages: 10-18(1990) DOI: 10.13756/j.gtxyj.1990.04.002
        摘要：In this paper, the principle of the stress corrosion and fatigue resistance of the optical fiber is described. Two approaches to the realization of the reliability of mechanical properties in making fatigueproof optical fibers have been given. The former is to reduce the stress from the fiber by using the compressive cladding technique, the latter is to isolate the fiber from the atmospheric environment by using the hermetical technique. The perspectives of the application of fatigueproof fibers are also described.  
          
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      • Xiao Xiaoming
        Issue 4, Pages: 19-25(1990) DOI: 10.13756/j.gtxyj.1990.04.003
        摘要：In this paper, the detailed theoretical analysis of the azimuthal filtering technique of cut-off wavelength has been carried ont and compared with the communication power method. The experimental set-up and the measurement on the cut-off wavelength of the conventional SM fibers are also described. The results are in fundamental agreement with that of communication power method and the calculation of matrix cut-off wavelength.  
          
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      • Li Zhenghuai
        Issue 4, Pages: 26-30(1990) DOI: 10.13756/j.gtxyj.1990.04.004
        摘要：How to obtain the needful overlength of loose-tube optical fiber on the secondary coating line when the number of overlength has been determined? Which factors will influence the overlength of loose-tube optical fiber on the secondary coating line?-These will be discussed in this paper.  
          
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      • Liao Xianbing
        Issue 4, Pages: 31-39(1990) DOI: 10.13756/j.gtxyj.1990.04.005
        摘要：In this paper, generation methods of ps optical pulse from semiconductor laser diodes are summarized. These methods include mode-locking, gain-switching, electrical feedback, optoelectronic feedback and Q-switching etc. State-of-the-art and the future prospect of the various technologies for generating optical pulse are also introduced.  
          
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      • Du Pujun etc
        Issue 4, Pages: 40-47(1990) DOI: 10.13756/j.gtxyj.1990.04.006
        摘要：In this paper, the metallized package workmanship of long wavelength light source devices is described. The reliability of the novel products made with this process has passed the proof test and achieved successful result. In particular, YAG laser welding technique has satisfied the fiber positioning process.  
          
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      • Ding Guoqing
        Issue 4, Pages: 48-55(1990) DOI: 10.13756/j.gtxyj.1990.04.007
        摘要：In this paper, the dependences of the dark current and optical multiplication factor on temperature for InGaAs/InGaAsP/InP SAGM-APD have been investigated and measured. Experiments show that the dark current will increase 10 to 30 times when the temperature rises up from 20℃ to 90℃,and the optical multiplication factor Mp will decrease by about 1/3 when the temperature rises from 20℃ to 60℃.The phenomena observed during the measurement are discussed. The paper also suggests to eliminate the nonsuitable chips for the SAGM-APD by the critical high-to-low temperature cycling.  
          
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      • Issue 4, Pages: 56-59(1990) DOI: 10.13756/j.gtxyj.1990.04.008
        摘要：<正> 为了提高光缆线路的可靠性,采用无金属线的光缆,这对避免雷击或强电的损害消除了内在因素。但无金属线光缆的外部还有金属护层,在这种情况下,光缆还要不要采取防雷防腐或其它防范措施呢?本文将就此问题进行讨论,以寻求无金属光缆防护的最佳方案。  
          
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      • Issue 4, Pages: 60-63(1990) DOI: 10.13756/j.gtxyj.1990.04.009
        摘要：<正> 亚运会一项很重要的工作是把现场的比赛盛况传送到亚运会新闻中心和国内外千家万户。根据亚运会筹委会的安排,武汉邮电科学研究院系统部图象数据传输室承担了亚运会11个场（馆）13套现场彩色电视传输任务,以及把中央电视台送来的5套亚运现场实况节目,从1号卫星地面站通过光缆传输系统传到4号卫星地面站,然后送上卫星向全球传播的任务。现将该工程概况和系统工作情况作一简介。  
          
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      • Issue 4, Pages: 64-65(1990)
          
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