最新刊期
      卷 ， 期 4 ， 1988
      • Issue 4, Pages: 1-7(1988) DOI: 10.13756/j.gtxyj.1988.04.001
        摘要：<正> 一、引言现阶段大量建设和实际应用的光波系统,是光纤通信的第三代系统,也就是波长1.3μm、用激光管的单模光纤系统。码速现多为400-565Mb/s,实际应用的最高码速为1.7Gb/s以上,中继距离达46km。目前的研究工作是进一步探索利用低损耗单模光纤巨大的潜在带宽容量。实验室试制的单模光纤在波长1.57μm已能获得最小损耗0.1 6dB/km,接近石英光纤瑞利散射的理论限度。在1.45—1.65μm的最小损耗波长范围内潜在带宽25THz,只须有效地利用其一小部分,就可为现代通信发挥很大作用。  
          
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      • TIAN RUI RAN
        Issue 4, Pages: 8-19(1988) DOI: 10.13756/j.gtxyj.1988.04.002
        摘要：According to the characteristic structure of optical fiber cables and the need for project applications,this article brings forward,from the point of view of saving project investment and easy maintenance,the theoretical bases and preventive measures for simplifying the three preventions of optical fiber communication lines.  
          
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      • HUANg SHOU PINg
        Issue 4, Pages: 20-25(1988) DOI: 10.13756/j.gtxyj.1988.04.003
        摘要：The effect of the variations of the refractive index profile parameters on the dispersion in multiple step fibers is analized, and the relationship between them is given. The judgement upon the direction of the variations of the dispersion is also discussed.  
          
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      • LI QING YING ZHANG YUAN CHAO
        Issue 4, Pages: 26-31(1988) DOI: 10.13756/j.gtxyj.1988.04.004
        摘要：This article introduces the application of a single-chip computer with its hardware and software in pinpoint loss measurement instrument for single-mode optical fibers. The microminiaturization and intillectualization of the optical fiber parameter measuring instrument is initially probed.  
          
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      • WANG QING YANG ZHANG MU
        Issue 4, Pages: 32-34(1988) DOI: 10.13756/j.gtxyj.1988.04.005
        摘要：This paper presents the new technique for preparing the fiber preforms with large core and large N A by the conventional MCVD process. Under the condition of doping no Boron, Using the technique by decreasing the flow of SiCl4 step by step in the core of the preforms, the problem of splitting caused by the different thermal expansion coefficient of the materials during the deposition and the depression as germanium is excessively doped in the core of the preforms for high refractive index defference An has been solved. By changing the moving velocity of the torch, the rate of deposition has been increased and the time for preparing the preforms has been shortened. The NA of the fibers to be drawn can be up to 0.30.  
          
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      • HU HUANG QIU
        Issue 4, Pages: 35-45(1988) DOI: 10.13756/j.gtxyj.1988.04.006
        摘要：This paper describes the 8 B1H code used in 140 Mb/s long-distance digital fiber communication system and its designs in detail, with the emphasis on the simplification, reliability and the convinience of production and maitenance for the purpose of optical performance required for the whole system In the end, the system performance and the operating functions of the monitoring system for 140 Mb/s long-distance digital fiber communication system using 8B1H code is briefly described.  
          
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      • Issue 4, Pages: 46(1988) DOI: 10.13756/j.gtxyj.1988.04.007
        摘要：<正> 光纤通信容量大、传输中继距离长、重量轻、不受电磁干扰、抗腐蚀能力强等特点,使它在通信、军事、电力、化工等部门得到广泛应用。国外资料早已介绍雷击损坏电缆而同槽敷设的光缆却安然无恙的事例。这里介绍国内示范工程中所遇到的光纤通信系统抗自然灾害的几个实例。  
          
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      • Issue 4, Pages: 46(1988) DOI: 10.13756/j.gtxyj.1988.04.008
        摘要：<正> 邮电部受国家计委委托,于1988年11月17—19日对武汉邮电科学研究院承担的国家项目—光通信系统试验场进行了鉴定验收。光通信系统试验场具有的34Mb/s、140Mb/s光通信设备（包括有人、无人中继器）及各种光缆组成的两套光通信模拟系统;无人中继站由太阳能、风能、油机、蓄电池等供电,并实现了自动监测和自动倒换;光通信系统试验场的人工气候室能给例行试验提供各种不同的环境温度和湿度。因此,能对四次群以下的光通信系统、光电器件、光纤光缆的各种性能指标进行测试和例行试验,达到了预期的目的。并为国家商检局认定为国家《光通信进出口商品检验室》。光通信系统试验场的建设,对我国光通信技术的发展将起积极的作用。  
          
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      • Issue 4, Pages: 47(1988)
          
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