最新刊期
      卷 ， 期 3 ， 1987
      • Zhou Shunqing
        Issue 3, Pages: 1-10(1987) DOI: 10.13756/j.gtxyj.1987.03.001
        摘要：The design and fabrication of practical long and short-wavelengths 34Mb/s optical receivers are described.The measured results of the receivers have shown good agreements with theoretical calculations. Such reveivers are now satisfactorily operating in practical 34Mb/s optical cable communication systems in Wuhan, Beijing and Taiyuan。  
          
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      • Issue 3, Pages: 11-15(1987) DOI: 10.13756/j.gtxyj.1987.03.002
        摘要：In this paper, novel methods for increasing production speed of preforms by MCVD and for expandingbandwidth of optical fibers are described. By using these methods, production speed of optical fibers can be increased from 0.5km/h to 1.1km/h, production yield with bandwidth larger than 1GHz·km from 45% to 91%.  
          
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      • Liu Yunguo,Chen Ruquan,Lu Xiangzhen
        Issue 3, Pages: 16-22(1987) DOI: 10.13756/j.gtxyj.1987.03.003
        摘要：In this paper, the tests of an 8.448Mb/s optical fiber digital transmission system applied to computer with superhigh-tension impulse interference in a voltage range from 800kV to 1500kV and strong magnetic-field interference in a current range from 1500A to 8000A are discussed,the application possibility of such systems in industries and military is also evaluated.  
          
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      • Chen Zenghua
        Issue 3, Pages: 23-26(1987) DOI: 10.13756/j.gtxyj.1987.03.004
        摘要：Based on the practical optical fiber communication project in the city of Taiyuan, Shanxi Province, an economic analysis is made on the 34Mb/s optical fiber cable communication system used as a local trunk line. The optimum economic and technical scheme is obtained as compared with copper cable systems.  
          
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      • Xu Xunchuan,Shen Fen,He Liya,Wu Tong,Li Rongping,Zhang Fenyun
        Issue 3, Pages: 27-29(1987) DOI: 10.13756/j.gtxyj.1987.03.005
        摘要：High speed and high power 1.3μm InGaAsP —InP DH edge LEDs with a short stripe structure are reported. At a driving current of 100mA,optical power coupled into a 50μm core, 0.2NA graded index fiber is larger than 60μW.The rise time and fall time are both about 2 ns. The spectral half width is 600—800A.  
          
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      • Lin Fengzi
        Issue 3, Pages: 30-37(1987) DOI: 10.13756/j.gtxyj.1987.03.006
        摘要：This paper discusses a mumber of binary line codes for optical fiber transmission systems with the emphasis on the features of 5B6B line code. Then, an introduction is made for the realization of the coding.  
          
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      • Li Jingchun
        Issue 3, Pages: 38-43(1987) DOI: 10.13756/j.gtxyj.1987.03.007
        摘要：Optical fibers with large deposited thickness and shallow depressed inner cladding（DIC） are widely used in monomode long-haul terrestrial and undersea communication systems. The aim of this paper is to investigate the effects of inner cladding parameters on mode cut-off and waveguide attenuation characteristics. Corresponding demonstration has also been made for these effects.  
          
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