最新刊期
      卷 ， 期 2 ， 1990
      • Zhang Xu
        Issue 2, Pages: 1-9(1990) DOI: 10.13756/j.gtxyj.1990.02.001
        摘要：This paper outlines the developments of two kinds of Local Networks: the subscriber network for public communication and local area network for private communication It describes three kinds of network topologies: star,bus and ring. It explains, for the sake of ever-increasing capacity, optical fiber is the sole choice for transmission medium, although the optoelectronic devices set the limit of power and the electronics act as bottleneck for bit rate. The frequency devision multiple access using fiber star coupler has proven successful. both the tunable laser-heterodyne detection and the tunable filter-direct detection may be used. For data transmission, the packet switching would be more efficient than the circuit switching. In supplement to the synchronous optical fiber network,asynchronous transfer mode must be used for variable bit rate and burst data.  
          
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      • Yang Zhu
        Issue 2, Pages: 10-24(1990) DOI: 10.13756/j.gtxyj.1990.02.002
        摘要：This paper inquires into the jitter accumulation in digital optical fiber regenerative transmission systems. Jitter accumulation properties with the resonant circuit as the timing circuit are discussed,and a simplified formula for the jitter accumulation that adapts to that estimation in engineering is given.  
          
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      • Wan Huanxin
        Issue 2, Pages: 25-32(1990) DOI: 10.13756/j.gtxyj.1990.02.003
        摘要：This paper describes some problems with the design and manufacture of the optical receiver at a practical angle, which have an effect on the properties of the optical receiver to a certain extent.Hence, some points to tackle these problems are discussed.  
          
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      • Xu Minggang
        Issue 2, Pages: 33-35(1990) DOI: 10.13756/j.gtxyj.1990.02.004
        摘要：Birefringence in multi-clading monomode fiber with ellipti al cross-section is studied in this paper with greater efforts in the effect of refractive-index profile and ellipticity on the birefringence and group delay cliff erence.The result shows, polarisation maintaining fibers with the low or high birefringence can be obtained by changing （?）1lipticity and profile of fibers of choosing （?） proper working freque（?）y.  
          
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      • Liao Xianbing
        Issue 2, Pages: 36-46(1990) DOI: 10.13756/j.gtxyj.1990.02.005
        摘要：In this paper, various factors effecting the modulation bandwidth of ultrahigh speed semiconductor laser modules are described. These factors are the relaxation oscillation frequency of LD chip, the parasitic parameters of LD chip and module, and the driving circuit frequency characteristics of lasers. Optimum design considerations of ultrahigh speed semiconductor LD module are presented. Finally,possibilities of further extending the bandwidth of module are discussed.  
          
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      • Li Ping
        Issue 2, Pages: 47-52(1990) DOI: 10.13756/j.gtxyj.1990.02.006
        摘要：This paper, based on the fabricated devices, discusses technical limitations and optimum operation characteristics for the InGaAs/InP SAGM avalanche photodiode.  
          
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      • Hu Taiguang Hu Hanwu Hu Meizi Meng Guangqi Liu Wujun
        Issue 2, Pages: 53-57(1990) DOI: 10.13756/j.gtxyj.1990.02.007
        摘要：In this paper, design criteria and characteristic parameters of a two-channel wavelength devision multiplexer/demultiplexer are described in detail. The device is simply constituted, but it is reliable. The insertion loss is less than 1.0 dB and crosstalk is less than-22dB.  
          
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      • Wu Deming
        Issue 2, Pages: 58-61(1990) DOI: 10.13756/j.gtxyj.1990.02.008
        摘要：<正> 1990年国际光纤通信会议（OFC′90）于1月22～26日在美国旧金山召开。据估计约有4000人出席会议。会议报告和发表文章226篇,其中辅导性报告11篇,书面报告34篇和迟到报告34篇。其余为分组报告。同时还有一个相当规模的展览会。这次会议的主题为“通过光纤传送电视”（Video Over Fiber）。另一个热点是光纤放大器。此外,还有光纤、激光器、检测器、光纤无源器件、光纤网和系统等。下面作一简单介绍。  
          
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