最新刊期
      卷 ， 期 3 ， 2004
      • YANG Zhu,ZHANG Qiang,LIU Xian-bing,XI Shen-e,ZENG Hui
        Issue 3, Pages: 1-9(2004) DOI: 10.13756/j.gtxyj.2004.03.001
        摘要：The large capacity ultra long haul（ULH） transmission is a very promising technology for future, this paper introduces the 160×10 Gbit/s system transmission experiment over actual 3 040 km G.652 fiber. The system uses C+L band and the channel interval is 50 GHz, adopting CS-RZ as the line code. The line rate is 10.7 Gbit/s. Using the broadband characteristics of the distributed Raman amplification technology, and compensating the disperse in C+L band at one time, we have greatly reduced the system costs as compared to separate band compensation. The experimental results show that after the 3 040 km transmission, Q value is lager than 4.29, the optical path penalty is smaller than 3.5 dB, the OSNR is lager than 15 dB, and the system runs error free for continuous 24 hours.  
        关键词：ULH optical transmission;CS-RZ;DRA;C+L band optical transmission;board band（C+L） disperse compensation   
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      • ZHU Bing,WEI Xue-qin,SUN Jun
        Issue 3, Pages: 10-12(2004) DOI: 10.13756/j.gtxyj.2004.03.002
        摘要：This paper presents signaling protocol in ASON. By signaling protocol, an LSP can be built and maintained. The paper lays emphasis on the additional extension of messages,the informations carried by these messages and processes of building an LSP by GMPLS signaling to support the capabilities of ASON. Finally, the time which is needed for setting up an LSP and restoring it after failure is analyzed in detail.  
        关键词：ASON;GMPLS;LSP;signaling;control plane;restoration of MESH network   
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      • SONG Hong-sheng,XU Yun-bin,GUI Xuan,ZHANG Jie,GU Wan-yi
        Issue 3, Pages: 13-15(2004) DOI: 10.13756/j.gtxyj.2004.03.003
        摘要：In this paper, a management interface implementation scheme of control plane in automatically switched optical network （ASON） is proposed. We first analyze the functional requirements of the interface, then present the control plane management information model and classify the interface informations. At last, the exchanging processes of interface information are showed. This can provide the theoretical guicteline for the management of control plane.  
        关键词：ASON;control plane （CP）;management plane （MP）;network management interface of control plane （NMI-A）   
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      • Issue 3, Pages: 16-17(2004) DOI: 10.13756/j.gtxyj.2004.03.004
        摘要：Routing and wavelength assignment problem is a key problem for WDM optical networks. Pricing of the optical networks will play a key role from network operator’s point of view to achieve the maximum profit. In this paper,a stochastic pricing model is proposed and simulation results show a close agreement with real network situations.  
        关键词：RWA;optimization;MILP   
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      • LI Yong
        Issue 3, Pages: 18-21(2004) DOI: 10.13756/j.gtxyj.2004.03.005
        摘要：The paper introduced the mapping and multiplexing methods of client signals,analyzed theoretically the justification ratio when the mapping and multiplexing the client signals, and gave the conclusion of justification ratio.  
        关键词：OTN;client signals;mapping and multiplexing;justification ratio   
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      • LIU Ai-bo,ZHAO Ji-jun,JI Yue-feng
        Issue 3, Pages: 22-24(2004) DOI: 10.13756/j.gtxyj.2004.03.006
        摘要：The importance of the resource management in next generation intelligent optical network is described in this paper, and we depict the resource management technology of intelligent optical network in detail based on two aspects: the resource management between adjacencies and the bandwidth control of whole network. The solution by using the link management protocol （LMP） is also given.  
        关键词：resource management;link management;neighbor discovery;ION   
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      • Issue 3, Pages: 25-26(2004) DOI: 10.13756/j.gtxyj.2004.03.007
        摘要：In this paper,performances of self-similar circumfluent network are analyzed.We develop two routing algorithms for this network model and compare the results with Manhattan street network（MSN）. Simulation results show that our model is more general and practical than MSN.  
        关键词：self-similar circumfluent;MSN;performance analysis   
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      • Issue 3, Pages: 27-29(2004) DOI: 10.13756/j.gtxyj.2004.03.008
        摘要：Waveband switching （WBS） has attracted much attention because of its practical importance in reducing the port count, associated control complexity, and cost of photonic cross-connections. This paper proposes two algorithms for waveband switching and discusses related issues in WBS network.  
        关键词：waveband switching;blocking probability;MG   
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      • LIU Li,ZHANG Jie,YANG Fang-nan,CHEN Xu-dong
        Issue 3, Pages: 30-32(2004) DOI: 10.13756/j.gtxyj.2004.03.009
        摘要：An algorithm for searching out all the available routes at one time has been designed and implemented. In order to show the free time slots on all available routes between every two ADM NEs in the managerial domain of sub-network management system（SNMS）, this routing algorithm calculates out all usable routes from the start node to the end node simultaneously. Through the verification of practice, it has exhibited good performance on its memory requirement and calculating time.  
        关键词：routing algorithm;SNMS;optical transport network;NE   
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      • ZHANG Ji-jun
        Issue 3, Pages: 33-36(2004) DOI: 10.13756/j.gtxyj.2004.03.010
        摘要：The term of QoS has been widely used in the telecommunication field, but generally it hadn’t been effectively defined when it was used, and sometimes was used inaccuracy. This paper discusses the basic definition of QoS with the help of constructing a common QoS model, introduces the framework of communication QoS and its four views.  
        关键词：quality;QoS;QoS performance parameter;QoS model;QoS view   
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      • HUANG Yan-tang,CHEN Chao
        Issue 3, Pages: 37-40(2004) DOI: 10.13756/j.gtxyj.2004.03.011
        摘要：We have proposed an optical access scheme for railway communication stations based on physical bus and logical star DWDM-OADM architecture optical transport networks. The OADM optical nodes architecture was described, the logical dual-star architecture’s self-healing function was illustrated. We have demonstrated the logical single-star architecture network transmission performance and analysed the factors limiting the network scale.  
        关键词：DWDM;OADM;optical node;self-healing network   
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      • WU Cui-xian,GUO Jun-neng,YANG Ying-hong
        Issue 3, Pages: 41-44(2004) DOI: 10.13756/j.gtxyj.2004.03.012
        摘要：This paper set out principle and concept of the FSO（Free Space Optics）, and put emphasis on several key technologies subsequently: redundant link control, dynamic trace control technology, FSO network management and FSO network security. In addition, we discuss its applications in optical communication access networks.  
        关键词：FSO;key technique;redundancy link control;dynamic tracking control;application   
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      • JIANG Lin~
        Issue 3, Pages: 45-48(2004) DOI: 10.13756/j.gtxyj.2004.03.013
        摘要：This thesis focuses on the toplevel design of the digital cross connect （DXC） chip. Based on the precept of 40 Gbit/s SDH （STM-256） fiber-optical communication devices & system, the design target of the chip is specified at the beginning, the functions, circuit and timing interface are clearly defined. Then the logic architecture is discussed with top to down design method. At last, the arrangements of registers are given.  
        关键词：SDH;DXC;ASIC   
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      • ZHAO Long,LI Xi-hua,WANG Ming-hua
        Issue 3, Pages: 49-51(2004) DOI: 10.13756/j.gtxyj.2004.03.014
        摘要：A novel electrode structure of DOS is proposed by employing two asymmetrical electrodes to Z-cut LiNbO3 at the beginning of the Y branch, resulting in considerable decrease of the crosstalk due to the increase of the intensity of the electrical field in the Y branch strongly coupling region. BPM is used to simulate the performance of this structure, it shows that compared to the symmetric electrode structure, the crosstalk decrease by 6 dB when the switching voltage is about 6 V. And it decrease to less than -20 dB when the switching voltage is between 6～9 V.  
        关键词：digital optical switch（DOS）;electrooptical switch;optical communication   
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      • LI Jin-yan,LI Hai-qing,JIANG Zuo-wen,CHEN Wei,LIU Xue-jun,LI Shi-yu
        Issue 3, Pages: 52-54(2004) DOI: 10.13756/j.gtxyj.2004.03.015
        摘要：D-shape inner cladding ytterbium doped fiber was fabricated based on requirements of high power fiber laser. Output power of the fiber is 62 W and slope efficiency is 66% when fiber length is 22 m and pump power is 98 W .  
        关键词：double-cladding ytterbium doped fiber;fiber laser;slope efficiency   
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      • YANG Gao-bo,XU Tie-feng,ZHOU Ya-xun,YANG Yan
        Issue 3, Pages: 55-57(2004) DOI: 10.13756/j.gtxyj.2004.03.016
        摘要：A barrier with circular-hole is placed in far-field area of a fiber, and the source light’s intensity received by PIN tube is adjusted by moving the barrier along the optical anxis with a stepper motor, which is controlled by a FPGA chip. A phase-locked amplifier is used to improve the signal-to-noise ratio of photoelectricity signal, and the FPGA chip is also utilized to incept the sampling signal and calculate the mode-field radius of single-mode optical fibers quickly. The device has good measuring and repeating precision.  
        关键词：single-mode optical fibers;mode-field radius;far-field area   
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      • CHEN Wei,LI Shi-yu,YIN Hong-bing,CHENG Yu,LU Da-fang
        Issue 3, Pages: 58-60(2004) DOI: 10.13756/j.gtxyj.2004.03.017
        摘要：In this article, the bandwidth of multimode optical fibers was analyzed in theory, calculated and optimized by simulation, the optimal exponents （g） of refractive index at different operating wavelengths were proposed, in the meantime, the bandwidth of 50/125 μm next-generation multimode optical fibers was analyzed.  
        关键词：optical fiber;multimode optical fibers bandwidth;exponent of refractive index   
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      • BAO Hong-qian
        Issue 3, Pages: 61-63(2004) DOI: 10.13756/j.gtxyj.2004.03.018
        摘要：The filling gels for fiber loose-tube are generally divided into two categories according to the thixotropic gels of which they are composed. Based on the essential elucidation on their respective thixotropic mechanisms, with the help of the rheogeniometer, the tests of the two representative fiber filling gels’ rheological properties including thixotropy and yield stress were carried out. The introductions of thixotropy loop and rheological equations of state buttress us with feasible means to analyse and compare the experimental results of these two gels.  
        关键词：fiber filling gel;rheological property;thixotropy;yield stress   
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      • CUI Qun-feng~1,CHENG Yu~2,CHEN Wei~2,LU Da-fang~2
        Issue 3, Pages: 64-67(2004) DOI: 10.13756/j.gtxyj.2004.03.019
        摘要：We outlined the history of optic amplifiers, analysed the advantages and disadvantages of EDFA and FRA, and the application area of rare earth doped tellurite glass amplification fiber. We also described the amplification mechanism of erbium doped fiber amplifier and thulium doped fiber amplifier, obtained the conclusion that rare earth doped tellurite glass amplification fiber is close to practical application in view of the current R&D of erbium doped tellurite glass amplification fiber and thulium doped tellurite glass amplification fiber.  
        关键词：optic amplification;rare earth doped;tellurite glass;gain   
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      • FANG Pei-shen,YANG Dong-xiao
        Issue 3, Pages: 68-70(2004) DOI: 10.13756/j.gtxyj.2004.03.020
        摘要：This paper outlined the properties and applications of plastic optical fiber （POF）. With the development of network technologies and various services, short-haul high speed communication network will be a target we pursue, the POF will be the first choice of transmission medium for high speed local area network （LAN） because it has a series of advantages such as excellent performances, high transmission rate, low cost and convenience of connection.  
        关键词：plastic optical fiber（POF）;local area network（LAN）;application   
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