最新刊期
      卷 ， 期 3 ， 2000
      • WEI Le ping
        Issue 3, Pages: 1-6(2000) DOI: 10.13756/j.gtxyj.2000.03.001
        摘要：This paper briefly summarises the current situation of optical fiber communication at the turn of the centuries, and then outlines the development trend of optical communication in the future.  
        关键词：optical communication;optical transmission   
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      • Issue 3, Pages: 7-10(2000) DOI: 10.13756/j.gtxyj.2000.03.002
        摘要：Noise accumulation of cascade EDFAs and system power budget in a WDM system have been studied. It is found that noise accumulation linearly increases with the number of EDFA, and exponentially increases with lose among EDFAs. When the distance of a system is fixed, the OSNR of a system with lower gain and more series is higher than a system with higher gain and less series .To ensure the characteristic of error code, OSNR of PA should be higher than a value which is directly proportional ratio to code velocity.  
        关键词：EDFA;noise;OSNR   
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      • ZHANG Xu,CHEN Xue,SUN Shu he
        Issue 3, Pages: 11-14(2000) DOI: 10.13756/j.gtxyj.2000.03.003
        摘要：Burst mode synchronization is a key technology in passive optical network that utilizes TDMA （Time Division Multi Address） with single mode fiber. For the clock recovery in burst mode transmission, a burst mode synchronizer using keyword detection based on multi phase clock is usually used. In this article, a novel high speed burst mode synchronizer based on data delay is presented. Because the same master clock is used in sampling circuit, phase alignment isn’t needed, and the circuit design can be simplified. This synchronizer is implemented by FPGA and ECL active tapped delay line, which can achieve high performance （155 Mbit/s） with low cost, short developing period, and easy migration.  
        关键词：Burst mode Synchronization;TDMA;PON   
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      • LI Jin,YANG Jian yi,ZHOU Qiang,WANG Ming hua
        Issue 3, Pages: 15-18(2000) DOI: 10.13756/j.gtxyj.2000.03.004
        摘要：We designed a media access control （MAC） protocol for ATM based passive optical network （ATM-PON）. The design of protocol is based on the frame structure of G.983.1（ITU T）, ensure fair access to the subscribers and make full use of network resource. The protocol can support CBR/VBR, ABR and UBR services, ensure fair access to the subscribers and make full use of network resource. The CBR/VBR services are given a high priority, and ABR services are ensured a minimum cell rate. The remaining bandwidth is allocated to the UBR services.  
        关键词：passive optical network （PON）;ATM;Media Access Control （MAC） Protocol   
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      • HAN Jing\+1,CHEN Hai jun\+1,ZHOU Dong ming\+2,YUAN Xin chang\+1
        Issue 3, Pages: 19-23(2000) DOI: 10.13756/j.gtxyj.2000.03.005
        摘要：Starting from the importance of the Building Integrated Timing System （BITS） in the synchronization network, this paper introduces the design principle and the function architecture of a BITS ClockStar, with an emphasis on the principle and characteristics of the direct digital synthesis （DDS） technology.At last we hist the test data of the timing equipment.  
        关键词：synchronization network;timing;BITS;DDS   
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      • YIN Hong xi,WANG Yong,WU De ming,XU An shi,XIE Lin zhen
        Issue 3, Pages: 24-29(2000) DOI: 10.13756/j.gtxyj.2000.03.006
        摘要：This paper presents, the basic concept, techniques and characteristics of optical code division multiple access network, especially the optical encoding and decoding technique of optical code division multiple access and its recent advances. At last it points out that optical code division multiple access networks techniques is an important technique and it will be widely applied in the future.  
        关键词：optical code division multiple access networks;optical encoder;optical decoder   
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      • TAO Zhen ning,WU De ming
        Issue 3, Pages: 30-33(2000) DOI: 10.13756/j.gtxyj.2000.03.007
        摘要：This paper discusses the statistical characteristics of the result of the bit error ratio measurement, and presentes the relationship among the result accuracy, reliability and the number of average error bits（so the measurement duration） during measurement. This paper is helpful for determining the measurement duration when the measurement accuracy and reliability are given.  
        关键词：bit error ratio;measurement;Poisson distribution   
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      • MAO Jing ru\+1,LU Zheng ding\+2
        Issue 3, Pages: 34-37(2000) DOI: 10.13756/j.gtxyj.2000.03.008
        摘要：This paper introduces ADSL’s architecture,interface,protocol,standards, modulation modes, etc.Then it analysises the function and characters of ADSL chips designed by several companies.At last,it describes ADSL’s access multiplexer producted by Alcatel Telecom.  
        关键词：ADSL;access;interface;protocol   
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      • NING Ti gang,ZHANG Jin song,PEI Li,JIAN Shui sheng
        Issue 3, Pages: 38-42(2000) DOI: 10.13756/j.gtxyj.2000.03.009
        摘要：The characteristics and advantages of fiber grating lasers （FGL） are presented in this letter. The progress of single wavelength FGL and multiwavelength FGL are summarized. The future applications of FGL are also described.  
        关键词：fiber grating laser;multiwavelength fiber grating laser;fiber grating   
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      • Issue 3, Pages: 42(2000)
          
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      • MA Hui lian,YANG Jian yi,LI Jin,WANG Ming hua
        Issue 3, Pages: 43-47(2000) DOI: 10.13756/j.gtxyj.2000.03.010
        摘要：The realization of effective optical waveguide fiber coupling is the key of commercialization of integrated optical components from the laboratory and the coupling efficiency affects the performance of these products directly. In this paper, we analyze main factors affecting the coupling efficiency, and then investigate and compare several coupling structures.  
        关键词：integrated optics;optical waveguide fiber;direct coupling   
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      • LI Bai yang,YANG Jian yi,JIANG Xiao qing,WANG Ming hua
        Issue 3, Pages: 48-52(2000) DOI: 10.13756/j.gtxyj.2000.03.011
        摘要：Dense wavelength division multiplexing（DWDM）is the key technology in optical fiber communication, and the arrayed waveguide gratings （AWG’s） have wide applications in WDM systems.This paper overviews the AWG’s: principle,development and applications in optical fiber communication systems.  
        关键词：AWG;WDM;Multi/Demultiplexer   
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      • LI Zheng dao
        Issue 3, Pages: 53-55(2000) DOI: 10.13756/j.gtxyj.2000.03.012
        摘要：In this paper, we represent a real example about analyzing the losse due to hydrogen diffusion and hope to stimulate relative optical cable makers to focus into the problems about the use of the material.  
        关键词：optical cable;losse due to hydrogen diffusion;compatibility   
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      • JIANG Yuan
        Issue 3, Pages: 56-62(2000) DOI: 10.13756/j.gtxyj.2000.03.013
        摘要：This article introduced bandwidth characters and application of graded index polymer optical fiber（GI POF）, compared transmission property of GI POF with that of SI POF, copper wire cable and glass fiber. Three methods of preparation of GI POF,i.e. popular copolymerisation, interacial gel copolymerisation and plasma, were emphatically analyzed. The course of research and development of GI POF, and the disparity between China and advanced countries in this field are also presented.  
        关键词：graded index polymer optical fiber;gradient index plastic optical fiber;plastic optical fiber;organic optical fiber;polymer optical fiber   
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