最新刊期
      卷 ， 期 4 ， 1987
      • C.K.Kao
        Issue 4, Pages: 1-10(1987) DOI: 10.13756/j.gtxyj.1987.04.001
        摘要：Recent advances in material fabrication techniques, analytic tools and computational power have greatly enhanced the prospect of making electrons and photons work, respectively, in their best roles,1012bit/s operating speed might be reached. Two basic research questions arise: （i） what are the configurational,physical,and material constraints which prevent devices from operating at this speed, and can these constraints be altered? （ii）If 1012bit/s can indeed be reached, what system functional building blocks should be generated ? Research directions in this area are suggested.  
          
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      • Bai Aimin
        Issue 4, Pages: 11-17(1987) DOI: 10.13756/j.gtxyj.1987.04.002
        摘要：In this paper, the design and fabrication of mask are reported, formulas for calculating mode field diameter are derived, based on the definition of mode field diameter of single mode fibers expressed by far-field RMS width, Moreover, the possible existence of systematic errors introduced by measurement is analysed, methods for reducing errors are proposed. Therefore, measurement of mode field diameter of single mode fibers by far-field mask is realized.  
          
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      • Issue 4, Pages: 18-23(1987) DOI: 10.13756/j.gtxyj.1987.04.003
        摘要：The spectral width of LEDs affects their transmission in single mode fibers, restricts their applications in fiber sensing, sensitive detecting as well as wavelength division multiplexing systems, This paper reports development process of a filter for compressing the spectral width of long wavelength LEDs. The important rule of GRIN rod-lens in axial separation coupling of fiber optic transmission is also highlighted in the paper.  
          
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      • Lei Fei
        Issue 4, Pages: 24-30(1987) DOI: 10.13756/j.gtxyj.1987.04.004
        摘要：This paper summarizes a revised scheme with higher automatic programs, based on the analyses on the measuring principle of P101 preform analyzer and on its software programs, and in combination with practical needs. The measuring time for each point has been reduced to less than 13 minutes,the user-computer conversations have been reduced to 5, while the measuring accuracy is guaranteed.  
          
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      • Xie Jingshan
        Issue 4, Pages: 31-41(1987) DOI: 10.13756/j.gtxyj.1987.04.005
        摘要：This paper reviews the reliability of semiconductor lasers from the following four aspects: 1. Factors affecting degradation modes and improvement of dovice lifetime; 2. Basic difference of degradation modes between GaAlAs/GaAs lasers and InGaAsP/InP lasers; 3.Review on and proposal for current lifetime test; 4. Direction for future study of reliability。  
          
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      • Issue 4, Pages: 42(1987) DOI: 10.13756/j.gtxyj.1987.04.006
        摘要：<正> 应武汉邮电科学研究院院长李光临的邀请,美籍华裔科学家厉毅鼎博士于1987年11月5日至8日来院访问讲学,并聘请厉鼎毅博士为武汉邮电科学研究院荣誉高级科学家。1987年11月7日由武汉邮电科学研究院赵梓森总工程师主持授聘仪式。出席授聘仪式的有:湖北省副省长梁淑芬,中科院水生生物研究所名誉所长、省科协主席、学部委员刘建  
          
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      • Issue 4, Pages: 43-44(1987)
          
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