最新刊期
      卷 ， 期 4 ， 1989
      • Zhang Xu
        Issue 4, Pages: 1-5(1989) DOI: 10.13756/j.gtxyj.1989.04.001
        摘要：This paper briefly des■ribes the worldwide trends of optical fiber communications research, emphasizing on the impor■ant applied research work and the obvious shift of the research topics. After enumerating an outline of general trends, it describes the technological progress in optical fiber, optoelectronic devices, coherent systems, m u 1ticarrier systems, public digi■al ne■work, and private local area network. ■ poin■s out the importance of OEIC, OFDM, sonet and FDD■. ■ will serve as referen■e for the research workers in this field.  
          
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      • Issue 4, Pages: 5(1989) DOI: 10.13756/j.gtxyj.1989.04.002
        摘要：<正> 1989年10月9至12日在上海召开了全国第四次光纤通信学术会议,此次会议共发表论文350篇,较全面地反映了1986年第三次会议以来,我国光纤通信的发展情况,对我国光纤通信技术的进一步发展具有很大意义。这次会议的论文比较注意高速传输系统,以及相干系统和孤子通信系统。张煦先生说:  
          
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      • Tian Liren
        Issue 4, Pages: 6-13(1989) DOI: 10.13756/j.gtxyj.1989.04.003
        摘要：This paper, according to the new CCITT re■ommendations in blue book of 1988 and the documents of IEC, and the experiences of some optical cable projects recently built in China, discusses several important principles that may be considered for general design.  
          
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      • Chen Jingxian
        Issue 4, Pages: 14-21(1989) DOI: 10.13756/j.gtxyj.1989.04.004
        摘要：This article analyzes clock recovery and decision circuit used in digital communication systems on optical fiber cables.The resort to select and design these circuit is given. The example of the practical circuit used in optical line terminal unit and repeater at 34 Mb/s is also given.  
          
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      • Xu Changgen
        Issue 4, Pages: 22-28(1989) DOI: 10.13756/j.gtxyj.1989.04.005
        摘要：Based on the formula S=10lg （6VN/RoRf）, the effect of various factors on the sensitivity of 34Mb/s PIN FET optical receiver is analysed quantitatively in this paper.  
          
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      • Sun Zhenxing
        Issue 4, Pages: 29-38(1989) DOI: 10.13756/j.gtxyj.1989.04.006
        摘要：This paper in■roduces spectral characteristics of InGaAsP/InP DC-PBH-LD and DFB-LD operating at different bit rates and optical output waveforms. The possibility of adopting Fabry-pe rot se■iconducto■ lasers as the light sou■ce for highe■ speed digital communications is also app■oched.  
          
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      • Chen Yongshi Zou Linsen
        Issue 4, Pages: 39-52(1989) DOI: 10.13756/j.gtxyj.1989.04.007
        摘要：This paper describes the quality test types and necessary test items for optical fiber and cable products as well as the principal technical specifications and test methods. Our purpose is to give a reference to the users for the acceptance check of the ordered optical fibers and cables  
          
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      • Shen Jingpei
        Issue 4, Pages: 53-56(1989) DOI: 10.13756/j.gtxyj.1989.04.008
        摘要：A directing technique is described to define the refractive index ellipse of the end face for SPSM fiber, particularly, for Bow-Tie fiber, by etching method. It includes the importance and the possibility of directing end face,optical path of illumination for directing as well as marking method.  
          
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      • Din Guoqing
        Issue 4, Pages: 57-64(1989) DOI: 10.13756/j.gtxyj.1989.04.009
        摘要：In this paper, we plot the space of device structure parameters, in which InGaAs/InGaAsP/InP avalanche photodiodes with seperated absorption, grading and multiplication region is estimated and choosed according to the requirement of the avalanche field and the field limitting tunnelling current in this device. Two kinks like a step of Ip-V curve are measured and explained. The expcrential formula which is in agreement with pratical measurement result of Mp is griven and discussed.  
          
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      • Issue 4, Pages: 65-66(1989)
          
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      • Issue 4, Pages: 67-64(1989) DOI: 10.13756/j.gtxyj.1989.04.010
        摘要：<正> 今年7月14至23日,在莫斯科举办的“中国科技日”活动期间,我们借机拜访了苏联邮电部,并参观了莫斯科一个装有光通信的市话局和国际卫星组织以及莫斯科电视中心。总的印象是通信四通八达普及率高,自动化水平高,不管是长途还是市话都很少有拨不通的情况。在通信新技术方面,如程控交换机,光纤数字通信系统,传真机和电传机等,苏联发展较慢。光通信系统虽已开始建设,但工艺水平不及我国;程控交换机和传真机还没有发展起来,  
          
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