最新刊期
      卷 ， 期 3 ， 1990
      • Zhang Xu
        Issue 3, Pages: 1-10(1990) DOI: 10.13756/j.gtxyj.1990.03.001
        摘要：In recent years,the demands of broadband video and high bit-rate data services are rapidly increasing, more research efforts are in favor of B-ISDN. It has been widely accepted that the transmission media would be single mode fiber operating at long wavelength, and standards of SONET and FDDI have been drafted. In order to meet with the requirments of broadband video and high bit-rate data services, appropriately flexible multiplexing and switching technology must be devised,and conventional packet switching technique must be modified-these give rise of the Asynchronous Transfer Mode（ATM）.This paper briefly explains the course of its development, then describes the ATM cell structure, system modelling, service performance, flow control, and the comparison between ATM and STM, as well as their hybrid operation in broadband local subscriber network.  
          
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      • Wang Baotai
        Issue 3, Pages: 11-20(1990) DOI: 10.13756/j.gtxyj.1990.03.002
        摘要：This paper describes the function and principle of demultiplexer for 560 Mbit/s optical terminal equipment. The formula calculating the synchronous time by detecting method widely used nowadays with one bit after another over the frame is derived. Coincidently, this experiment has been carried out. The frame structure of 571 Mbit/s system is finally imagined.  
          
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      • Han Yanmei
        Issue 3, Pages: 21-29(1990) DOI: 10.13756/j.gtxyj.1990.03.003
        摘要：In this paper, a new coding scheme of 5B6B Iine code by using the redundancy to transmit ancillary signals is proposed. It allows the insertion of an ancillary channel with a capacity of about 0.6% that of the primary channel. Two new coding schemes of 5B6B code are shown and the comparison is made on the hardware.The power spectral densities of them are analysed and calculated.The result shows that the power spectral density of the new 5B6B code is well-performed as the primary one.  
          
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      • Zou Linsen
        Issue 3, Pages: 30-40(1990) DOI: 10.13756/j.gtxyj.1990.03.004
        摘要：This paper presents a suggestion for the optimum design of excessive fiber length in cable based on test data and theoretical evaluation. The suggestion will exhibit a worthful reference for the practical use.  
          
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      • Wang Yongfa Huang Shouhua
        Issue 3, Pages: 33-40(1990) DOI: 10.13756/j.gtxyj.1990.03.005
        摘要：In this paper, the correlation between quantum phase noise and field of single frequency semiconductor laser is investigated with the method of self-delayed heterodyne. The influence of quamtum phase noise on coherent detection system is discussed in terms of photocurrent auto correlative and power spectral functions. In general, photocurrent power spectrum consists of delta function and qnasi-Lorentzian shape portion, which is of great significance for the coherent measurement of semiconductor lasers.  
          
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      • Wang Yuzhang Huan Kaiping Zhao Junying
        Issue 3, Pages: 41-50(1990) DOI: 10.13756/j.gtxyj.1990.03.006
        摘要：Lifetest of semiconductor lasers used as light source in fiber-optic communications is described in detail.DC-PBH lasers were used for our experiment, which undertook the high temperature atmospherewith high stress to accelarate the lifetest. No random failure phenomena were observed throughout the experiment. According to the results from the experiment, the lasers’extrapolated MTTF is 2.6×105 hrs（σ=1.06） and failure rate λ（t） vs. time t relations are also given for the purpose of the engineering design of fiber-optic communications.  
          
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      • Hu Taiguang
        Issue 3, Pages: 51-56(1990) DOI: 10.13756/j.gtxyj.1990.03.007
        摘要：In accordance with three main factors of Ti:LiNbO3 waveguide and optical fiber,i.e.mode field distribution,numerical aperture and geometry dimension, the paper expounds the coupling of Ti:LiNbO3 waveguide to optical fiber,and some high-efficiency coupling methods appropriate for engineering applications are simply described.  
          
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      • Issue 3, Pages: 57(1990) DOI: 10.13756/j.gtxyj.1990.03.008
        摘要：光纤通信正在全国推广应用。使用单位迫切需要交流有关光纤通信方面的维护管理经验。这篇“经验交流”是由张文德同志撰写的“合肥市140Mbit/s光纤通信工程”一文中摘录的,希望能对一些读者有所帮助。本刊编辑部热忱欢迎广大从事光纤通信工作的维护管理工作者,在本刊上介绍宝贵经验,为推广光纤通信作出贡献。  
          
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      • Issue 3, Pages: 58-59(1990) DOI: 10.13756/j.gtxyj.1990.03.009
        摘要：<正> 数字光纤通信是现代通信的发展方向,是一门高技术产业。国际上竞争激烈,但对我国实行技术封锁。国内在这方面的研究工作起步较晚,研究、生产的工艺条件较差。虽然我国的数字光纤通信产业已初具规模,其国内市场占有率正逐步提高到1989年的26％左右,但其技术水平与国外先进设备的差距还较大。为了赶上国外先进水平,发展我国的数字光纤通信  
          
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      • Issue 3, Pages: 60-61(1990) DOI: 10.13756/j.gtxyj.1990.03.010
        摘要：<正> 苏嘉杭光缆通信工程是江浙两省共建的一条跨省的长途二级通信干线。该工程西起杭州市长途通信枢纽大楼,途径余杭（临平）、桐乡、海宁、嘉兴、平望、吴江,东止于苏州市电信大楼,共经过三市五县,全程光缆总长度216km。主干线为二主一备的34Mbit/s光纤数字通信系统。通信容量为960路加区间通信120路。另外在苏州至吴江（一主一备）,杭州至  
          
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