最新刊期
      卷 ， 期 5 ， 2000
      • LUO Lai rong,CHENG Xiao fei,GU Wan yi,JI Yue feng,XU Da xiong
        Issue 5, Pages: 1-6(2000) DOI: 10.13756/j.gtxyj.2000.05.001
        摘要：The optical channel network management requirements and the transport technologies are analysed.The OCh transport technologiy of OCh frame （digital wrapper） and its bytes definition & allocation for OCh overhead are studied on the basis of current development trend of optical transport network.  
        关键词：OCh frame;digital wrapper;OCh overhead transport;optical network management   
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      • GUO Wei,JI Yue-feng,HUANG Yong-qing,REN Xiao-min -
        Issue 5, Pages: 7-10(2000) DOI: 10.13756/j.gtxyj.2000.05.002
        摘要：The paper introduces some basic advantages of the multiwave length optical transport networks, compares it with the SDH networks, analyzes t he protection and failure restoration of the multiwavelength optical networks, especially multiple fiber ring networks. At the last, the performance monitoring and the determination of protection criterion are presented.  
        关键词：optical transport networks;protection and failure restorat ion;ring optical networks   
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      • LIU Qiong,CHEN Hai-qing -
        Issue 5, Pages: 11-14(2000) DOI: 10.13756/j.gtxyj.2000.05.003
        摘要：This paper describes the function layer construction, network survivability and security performance requirements of optical tr ansport network, defines the management function of optical transport net work, especially analyzes the optical supervision channel technologies of OADM/O XC.  
        关键词：OTN;OADM;OXC;OSC   
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      • CHEN Xue,HUANG Li-xuan -
        Issue 5, Pages: 15-18(2000) DOI: 10.13756/j.gtxyj.2000.05.004
        摘要：The increasing demand for broadband data services offers new opportunities for the development of access network. This paper firstly int roduces the basic concept and characteristic of APON, then analyzes the protecti on switching method fit for APON. In the end, four possible duplex APON configur ations are given.  
        关键词：AN;APON;survivability;Protection switching   
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      • XU Rong,GONG Qian,JI Yue -feng,YE Pei-da -
        Issue 5, Pages: 19-26(2000) DOI: 10.13756/j.gtxyj.2000.05.005
        摘要：A new optical Internet networking based on IP over DWD M technologies is studied in this paper. On the basis of described three solutio ns for the future information network scenarios, it specially depicted the key t echnologies and network architectures of the optical Internet based on IP over D WDM.  
        关键词：IP over DWDM;IP access;optical Internet   
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      • TANG Jia-wu,Hideaki Tsushima -
        Issue 5, Pages: 27-34(2000) DOI: 10.13756/j.gtxyj.2000.05.006
        摘要：s:This paper gave an analysis of the generation reas ons of the EDFA’s transient response in optical network, and presented some expe riments for the relative factors. A scheme to resolve this problem has been put forward and proved through experiment, the result conforms to that we expected.  
        关键词：transient response;feedback loop;auto-gain control   
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      • MA Kai,XU Chong-jie,CHEN Jian-hui -
        Issue 5, Pages: 35-39(2000) DOI: 10.13756/j.gtxyj.2000.05.007
        摘要：This paper analyse the key techniques in implementatio n of OCDMA system , and gives a detail discussion on both the existent problems and future development of OCDMA system.  
        关键词：OCDMA;MUI;DWDM;CCD   
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      • Issue 5, Pages: 40-42(2000) DOI: 10.13756/j.gtxyj.2000.05.008
        摘要：The Yb doped double clad fiber with glass inner and out er cladding has been designed and fabricated. It is compatible and can be easily spliced with standard fiber. The fiber’s output power and slop efficiency was 9 0 mW and 28 %, respectively, limited only by used pumping power. The characteris tics of fiber laser have been also investigated.  
        关键词：Yb doped fiber;optical fiber laser   
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      • DING Guo-qing -
        Issue 5, Pages: 43-49(2000) DOI: 10.13756/j.gtxyj.2000.05.009
        摘要：This paper analyses and compares the advantagies and dis advantagies in structure, specifications and reliability for some types of mesa and planar, long wavelength APDs, presents some physical limitations and optimum structures for the long wavelength APDs under present technology conditions. Th e greatest photomultiplication and the optimum optical receiver sensitivity of the APDs are also discussed practically and theoretically.  
        关键词：SAGM-APD;photomultiplication factor;excess noise fact or;optical receiver sensitivity   
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      • MA Hui-lian,YANG Jian-yi,LI Jin,WANG Ming-hua
        Issue 5, Pages: 50-53(2000) DOI: 10.13756/j.gtxyj.2000.05.010
        摘要：A multi-mode interference （MMI） GaAs 1×4 optical p ower splitter that can be directly coupled with single mode fiber array was fabr icated through optimized structure design and preferential etching. The 1.3 μm He-Ne laser measurement indicated that the device has basically realized the re quirement of uniform power splitting, the power imbalance is 0.155 dB.  
        关键词：GaAs/GaAlAs;preferential etching;MMI optical sp litter   
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      • TANG Ren-jie
        Issue 5, Pages: 54-58(2000) DOI: 10.13756/j.gtxyj.2000.05.011
        摘要：Base on the recently published literatures and information f rom international technical exchanges, this paper reviews the state-of-arts an d the trend in future in optical fiber preform fabrication technologies.  
        关键词：optical fiber preform;two-step process;core-rod;overcl adding   
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      • LIU Qiang,DUAN Jing-han,MAO Yong
        Issue 5, Pages: 59-62(2000) DOI: 10.13756/j.gtxyj.2000.05.012
        摘要：Based on an analysis of three current methods of measur ement of optical fiber attenuation, we proposed a new measuring method which can completely eliminate the measurement error of overall attenuation in optical fi ber link caused by existing methods, this greatly enhancing the measuring accura cy.  
        关键词：Cut-back method;insertion loss method;back-scattering me thod   
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