最新刊期
      卷 ， 期 4 ， 1997
      • Mao Qian
        Issue 4, (1997)
        摘要：Recommendation G.783 gives a description of the SDH equipment characteristics, it is very important. Since 1990,the first version of this Recommendation is published, it was revised many times. Its description method is changed from the original Function Block to present Atomic Structure . In this paper, the introduction is focused to the basic rules of the Atomic Structure description, and the main differences between Atomic Structure description and Function Block description .  
        关键词：SDH;recommendation;function block;atomic structure   
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      • Niu Lixin
        Issue 4, (1997)
        摘要：The converting of STM1 signal from serial into parallel by FPGA is introduced in this paper. The difficulty of realization and test results is discussed.  
        关键词：SDH;STM1;S/P;synchro;descramble;FPGA   
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      • Wang Zhijun
        Issue 4, (1997)
        摘要：Broadband optical access network（OAN） is one of the important methods to realize BISDN. In this paper, the development of OAN is described. Several major technology applied for establishing broadband OAN and the characteristics are presented and analyzed.  
        关键词：broadband;optical access network;passive optical network   
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      • Yin Hongxi Zhang Guangzhao
        Issue 4, (1997)
        摘要：,,This paper presents the definations,the bounds of cardinality about constantweight optical orthogonal codes variableweight optical orthogonal codes and a diffference matrix method for obtaining the autoand crosscorrelation of two codes.It also gives comparision about cardinality and constructions among of several OOC’s mentioned above.  
        关键词：constantweight optical orthogonal codes;variableweight optical orthogonal codes;cardinality;constructions   
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      • Zhang Xiaoguang Wang Yonggang
        Issue 4, (1997)
        摘要：Different from traditional treatment of solving wave equation,this paper analyzed mode mechanism in optical waveguide in the simple viewpoint based on the concepts of superposition of light waves,which generally used in general physics.The clear physical definition of waveguide mode is given.The field distributions in symmetry and asymmetry plane waveguide are calculated by the simple method from this viewpoimt,and the physical significance of characteristic equation and normalized frequency are also given.  
        关键词：optical waveguide;mode;characteristic equation;normalized frequency   
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      • Yu Jianjun Yang Bojun Guan Kejian
        Issue 4, (1997)
        摘要：A nonlinear RZ optical pulse through a fiber chain with average GVD in the normal dispersion is numerically researched.The results show that the nonlinear optical pulse with the input pulse width 20 ps,repetitive frequency 7.4 GHz can propagate over 1 000 km even if the fiber chain has average GVD in the normal dispersion. But enhancing input power can not lengthen transmission distance.  
        关键词：nonlinear optical pulse;eye diagram;error rate;dispersionallocated technology   
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      • Wen Shuangchun
        Issue 4, (1997)
        摘要：Modulational instability of femtosecond optical pulses in fibers near zero dispersion point is investigated using an extended Schrodinger equation.A new region where modulation instability occurs is found due to the fourth order dispersion.It is shown that the self steeping exists a threshold in affecting the appearance of the new region,Raman nonlinear retarded effect has a greater influence on growth rate,and spectral extents of the two unstable regions can make the two regions merge into one region which has a wider spectral extent.  
        关键词：minimum group velocity dispersion;fouth order dispersion;modulational instability   
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      • Liu Shusong,Fu Qiuyun,et al.
        Issue 4, (1997)
        摘要：This article introduces the clock frequency source theory of the 155.52 Mbit/s、622.080 Mbit/s、2 488.32 Mbit/s and 10 Gbit/s SDH system . According to the requirment of the SDH system,we have developed out the voltage controlled oscillator .When the ambient temperature changes from 0℃ to 70℃, the frequency shift is better than ±1×10 -6 . The time domain short term stability is better than 1.25±10 -9 .  
        关键词：SDH;netwok unit clock;stability;quartz oscillator   
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      • Wu Zhongjun,Lu Xiaodong et al
        Issue 4, (1997)
        摘要：An insert pull, dual core SC fiber connector has been developed recently. This paper recapitulates the connector’s structure, speciality of the design, the property of the materials and fabrication technique. Its results of the various experiments are also presented . The average insert loss of the connector is 0.16 dB for single mode fiber, the average return loss is 43.4 dB.  
        关键词：fiber;connector;insert loss;return loss   
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      • Yao Jian Fang Luozhen et al.
        Issue 4, (1997)
        摘要：In this article, two optical isolators are reported. The operation principle of the polarization independent isolator and the miniature freespace isolator are described. The insertion loss, isolation, return loss, polarization dependent loss （PDL） of the isolators are discussed. The specificities of the isolators are compared with that of the same kind products internationally.  
        关键词：optical isolator;polarization;optical communication   
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      • Issue 4, (1997)
        摘要：,,Parametric measurements measure waveform properties such as rise time,fall time,overshoot,period,and amplitude on either a pulse waveform or an eye diagram.Mask measurements compare the shape of the waveform to a predefined mask.Eye parameter measurements measure properties that are uniqe to eye diagrams,such as eye height,eye width,jitter,crossing height ,and extinction ration.  
        关键词：measuring equipment;digital communication analyzer;mask measurement   
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      • Issue 4, (1997)
        摘要：用原子结构描述的ＳＤＨ设备名词术语中英文对照＠毛谦用原子结构描述的ＳＤＨ设备名词术语中英文对照毛谦ＡＡｄａｐｔａｔｉｏｎｆｕｎｃｔｉｏｎ适配功能ＡｃＳＬＡｃｃｅｐｔｅｄＳｉｇｎａｌＬａｂｅｌ接受的信号标签ＡｃＴＩＡｃｃｅｐｔｅｄＴｒａｃｅＩｄｅｎｔｉｆｉｅ...  
          
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