最新刊期
      卷 ， 期 3 ， 1996
      • Wu Sanming,Mao Qian
        Issue 3, (1996)
        摘要：The slave clock adapted to SDH equipments, as well as the G. 813clock, is the special clock of SDH network. This article analyses the timing characteristics of the G. 813 clock in detail. Firstly,the paper introduces the mathematical model of timing singal. The definition and characteristics of parameters which indicate the stability of frequency and time are given. And the analysis in frequency and time domain is made. Based on these,the noise model of G. 813 clock is built. Finally, the several questions about timing charateristic standard given in ITU-T Rec. G. 813 are discussed. The unique opinions are given.  
        关键词：G. 813 clock;TDEV;ADEV;MDEV   
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      • Wang He,Zhu Jiaxin
        Issue 3, (1996)
        摘要：Methods used to reduce waiting time jitter caused by positive justification, positive/zero/negative justification and pointer adjustment are introduced in this paper. The concept and their implementation schemes are also discussed in detail.  
        关键词：Waiting time jitter;pulse stuffing;pointer adjustment   
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      • Deng Zhifang,Yang Chun
        Issue 3, (1996)
        摘要：This paper describes the influence of laser extinction on the SDH equipment performance and introduces two methods of laser extinction measurement. The error reasons of measurement are also analyzed.  
        关键词：extinction;eye pattern;optical transmitter   
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      • Zhang Quan,Guo Jianen,Li Ling
        Issue 3, (1996)
        摘要：Optical frequency division multiplexing （OFDM） is an optical communication method which explores optical fiber band and expands the transmission capacity. In recent years,the research in OFDM has made great progress. To decrease the crosstalk and signal distortion, we need to optimize the channel parameters when we design an OFDM system. According to the characteristics of OFDM system,the paper describes a method of time domain analysis,offers the computer numeric solution and stimulates the eye pattern of the received signals. Then, by the eye pattern that illustrates the influence of the parameters on the system performance,the optimized value of the parameters is obtained.  
        关键词：FDM;FSK;the eye pattern;F-P cavity optical filter   
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      • Chen Jian,Yang Xianglin
        Issue 3, (1996)
        摘要：The principle of the average soliton transmission system is summarized qualitatively and quantitatively. The two concepts, i. e., the average soliton and the guiding center soliton,are unified. The analytical method of such a system is discussed. Design considerations, features and the operation flow of a software emulating the pulse transmission in the average soliton transmission system are introduced. It is pointed out that the software is an effective tool to analyze the average soliton transmission system working in non-ideal conditions.  
        关键词：average soliton;all-optical communication;guiding center soliton   
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      • Zhou Bensheng
        Issue 3, (1996)
        摘要：Fiberoptic sensor can be used to detect variations of outer factors,such as speed, electric current and temperature, etc. This paper proposes an idea of phase modulated interferometric fiberoptic sensor being used in chromatic dispersion measurement in single mode fibers. Detailed theory analyses and improvements of great worth in experiment are given. Final results are satisfactory.  
        关键词：phase modulated;sensor;chromatic dipersion   
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      • Ding Guoqing
        Issue 3, (1996)
        摘要：The basic principle of Fourier Transform photoluminescence test is introduced in this paper. The photoluminescence spectrum of some typical heterostructure materials measured by the PL 6120 equipment is reported. The double peak structure and anomalous temperature characteristics on the photoluminescence spectrum are analyzed and discussed. It has been showed that physical reasons are resuled from the atomic disorder on the hetero-interface and the inner stress in the epitaxial layers.  
        关键词：photoluminescence spectrum;band-band radiation combination;exciton;the blue shift of the energy   
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      • Yao Jian,Liang Chenhuan
        Issue 3, (1996)
        摘要：In this paper, a FC-PC singlemode optical fiber connector with high performance is reported. The design principle of the connector is introduced. The optical characteristics and environmental stabilization of the connector is discussed.The main technical specifications of the connector is compared with the same kind of connectors abroad.  
        关键词：singlemode optical fiber;connector;ferrule   
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      • Yu Guohua et al.
        Issue 3, (1996)
        摘要：In this paper, on tile basis of theory of ray optics, a mathematical model used to compute the coupling loss of GRIN lens with twin-core fiber has been described. According to this model, we show that the relative curve between coupling loss of GRIN lens and distance of twin-core fiber is obtained. In our pratical coupling system of GRIN lens with twin-core fiber, coupling loss of twin core is 0. 79 dB、0. 85 dB, respectively.  
        关键词：GRIN lens;twin-core coupling;coupling loss   
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      • Yi Wuxiu
        Issue 3, (1996)
        摘要：The configuration of OTDM extra-high speed communication systems and its recent developments in advanced countries have been introduced in this paper. Emphases are laid on key technologies to be applied to configurate OTDM extra-high speed communication systems:generation technology of extra-short optical pulses, all-optical MUX/DEMUX technology and optical timing extraction technology.  
        关键词：OTDM;extra-short optical pulse;MUX/DEMUX;optical timing extraction   
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      • Issue 3, (1996)
        摘要：武汉邮电科学研究院９３级硕士论文摘要［编者按］本专栏刊出武汉邮电科学研究院９３级硕士研究生的论文摘要。本刊编辑部正进一步组织论文作者，将论文内容整理出精炼的文章，计划在今后几期内发表，供读者参考．ＳＤＨ的从钟技术研究生：吴三明导师：毛谦网同步和时钟是...  
          
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