最新刊期
      卷 ， 期 5 ， 2003
      • YANG Zhu,LIU Xianbing,ZHANG Qiang
        Issue 5, Pages: 1-7(2003) DOI: 10.13756/j.gtxyj.2003.05.001
        摘要：The large capacity ultra long haul（ULH） transmission is a very promising technology for future, this paper introduces the 32×10 Gbit/s system transmission experiment in an actual 3 040 km G.652 fiber line. The system, adopting NRZ as the line code and employing the distributed Raman amplification technology, has a bit rate of OTU2 format in accordance with G.709. The experimental results show that after the 3 040 km transmission, Q value is lager than 3.82, the optical path penalty is smaller than 1.6 dB, and the system runs error free for continuous 24 h.  
        关键词：ultra long haul （ULH） transmission;DRA;DGE   
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      • LIU Xianbing,XIE Qiuhong,XI Shene, WANG Hongqi,GUO Zhengjun,YANG Zhu,YANG Zhuang
        Issue 5, Pages: 8-10(2003) DOI: 10.13756/j.gtxyj.2003.05.002
        摘要：In this paper, the authors introduce the concept of optical signaltonoise ratio （OSNR） gain. We also derive the expression of OSNR of multispan DWDM systems including distributed Raman amplifiers （DRA）. The theoretical prediction agrees well with the experimental results.  
        关键词：DRA;OSNR;OSNR gain;on-off gain;equivalent noise figure   
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      • TANG Jianjun,JI Yuefeng
        Issue 5, Pages: 11-14(2003) DOI: 10.13756/j.gtxyj.2003.05.003
        摘要：This paper introduces justenoughtime （JET） protocol, optical burst switching（OBS） network architecture and control packet structure. Then the key technologies of OBS, such as contention resolution, QoS support, data burst assembling algorithm and recovery mechanism, are investigated and analyzed in detail.   
        关键词：OBS;JET protocol;QoS;contention resolution   
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      • Issue 5, Pages: 15-18(2003) DOI: 10.13756/j.gtxyj.2003.05.004
        摘要：The blocking performance of the multiwavelength optical switching node without optical buffer, as well as the node blocking performance of shared multilink in different networking scales are analyzed in this paper. A novel weighted deflectionswitching mode is proposed; it utilized the extra idle switching capacity to groom the traffic load, so the blocking ratio will be reduced further.  
        关键词：optical switching;shared link switching;weighted deflection switching;blocking performance   
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      • TANG Wan1,SO Wonho2,YANG Ximin1,KIM YoungChon2
        Issue 5, Pages: 19-21(2003) DOI: 10.13756/j.gtxyj.2003.05.005
        摘要：In this paper, we propose the acyclic deflection routing （ADR） algorithm for OBS networks. The main idea of the ADR algorithm is to determine the deflection paths based on the pathdegree and the average hop distance of nodes. A network simulation model is developed to evaluate the ADR algorithm in terms of data burst loss probability, average hop distance, and endtoend delay. Simulation results show that the proposed algorithm can determine efficient loopless deflection paths and provide the fair utilization of network resources for OBS networks.  
        关键词：optical burst switching（OBS）;deflection routing;path-degree   
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      • WANG Chengyi,SHI Bingxin
        Issue 5, Pages: 22-24(2003) DOI: 10.13756/j.gtxyj.2003.05.006
        摘要：The structure of traditional LDP and the encapsulation format and relationship of the information of various layers are analysed in detail first in this paper, Then the main expanding of CRLDP from LDP is summarized. After that, expanding of CRLDP to GMPLS is showed by an example. Finally the data structure of the GMPLSCRLDP is summed up and designed.  
        关键词：GMPLS;LDP;CR-LDP   
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      • WU Jun,LU Zhengding
        Issue 5, Pages: 25-28(2003) DOI: 10.13756/j.gtxyj.2003.05.007
        摘要：This paper presents a brief introduction to CORBA technology and its features, analyzes the functional requirements of the current integrated network management system, lastly, discusses application of CORBA technology in integrated network management system for transport network.   
        关键词：CORBA;TMN;network management system;northbound interface   
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      • TAO Qing,LIU Hai,LIU Deming
        Issue 5, Pages: 29-32(2003) DOI: 10.13756/j.gtxyj.2003.05.008
        摘要：In this paper, first,architecture and its relevant techniques of EPON are discussed, and second,a scheme is put forward to manage EPON equipment efficiently using simple network management protocol（SNMP） and its extensible agent protocol AgentX.  
        关键词：EPON;SNMP;AgentX protocol   
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      • LI Wenyao1,LI Zhigang2
        Issue 5, Pages: 33-35(2003) DOI: 10.13756/j.gtxyj.2003.05.009
        摘要：This paper makes a detailed discussion on two different structures of control plane of ASON.The first has an architecture with the control plane totally external from the NEs, while the second has an architecture with the control plane partially integrated with the NEs. This paper gives also the comparison between the two kinds of structures.  
        关键词：ASON;control plane;function structure   
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      • LIU Guohui,LI Wenyao
        Issue 5, Pages: 36-38(2003) DOI: 10.13756/j.gtxyj.2003.05.010
        摘要：The signaling technology is one of the key technologies for ASON.This paper described the main functions of signaling model of ASON （DCM model） and its realization, then mode a detailed analysis of the calling processing and connection processing procedures for ASON signaling.  
        关键词：ASON;DCM;signaling   
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      • XIONG Jinhua
        Issue 5, Pages: 39-42(2003) DOI: 10.13756/j.gtxyj.2003.05.011
        摘要：This article figures out sustained time of switch completion through describing the schedule of protection switch in SDH MSspring. Practical examples are given and optimizing program of switching is provided.  
        关键词：MS-spring;switching time;calculation and analysis   
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      • YANG Yongjie,BAO Zhihua
        Issue 5, Pages: 43-45(2003) DOI: 10.13756/j.gtxyj.2003.05.012
        摘要：In this paper, a distant video monitoring system based on H.261 recommendation is presented. The system employs the technique of automatically adjusting the coding rate according to the image data quantity. Using this new variable coding rate technique,the video signal is coded and compressed, and transferred through a optical fiber to control center for monitoring and decording. Experiments show that the system works stably and has a good effect of monitoring.  
        关键词：variable coding rate;coding compression;data stream.   
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      • Issue 5, Pages: 46-49(2003) DOI: 10.13756/j.gtxyj.2003.05.013
        摘要：This paper gave a brief introduction to the principle of digital phase locked loop （DPLL）,and presented the design of clock recovery phase locked loop and jitter attentuation phase locked loop of the V5 interface chip as well as the relevant analyses.  
        关键词：clock recovery;jitter attenuation;DPLL;design of ASIC   
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      • Lü Hui,HUANG Longbo
        Issue 5, Pages: 50-52(2003) DOI: 10.13756/j.gtxyj.2003.05.014
        摘要：According to the rapid development of DWDM technology today,this paper introduces some optical wavelength measuring technologies which is widely used for high precision DWDM system measurement.We also discuss the perspective of optical wavelength meter to some degree.  
        关键词：DWDM;optical wavelength measurement;optical communication   
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      • Issue 5, Pages: 53-55(2003) DOI: 10.13756/j.gtxyj.2003.05.015
        摘要：目前,光纤通信正向高速、宽带和超长距离方向发展.文章介绍了光纤通信技术的发展现状,并对光纤通信的发展趋势进行了展望.  
        关键词：光纤通信;技术现状;研究方向   
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      • LU Hua1,LUO Juan2,GUAN Jian3
        Issue 5, Pages: 56-59(2003) DOI: 10.13756/j.gtxyj.2003.05.016
        摘要：This paper presents the key technologies of VDSL and ADSL, and the comparison of these two kinds of DSL technologies in terms of modulation,topology and application circumstances.  
        关键词：VDSL;ADSL;QAM;CAP;DMT   
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      • DIAO Qingfan,TAN Xinquan
        Issue 5, Pages: 60-62(2003) DOI: 10.13756/j.gtxyj.2003.05.017
        摘要：Edge network construction becomes the attention hotspot of mobile operators. This paper discusses edge network referring to different goal areas, introduces Xuchang edge network solution, provides general edge network solution for remote rural areas.  
        关键词：GSM network;edge network;field trial   
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      • HU Xianzhi
        Issue 5, Pages: 63-66(2003) DOI: 10.13756/j.gtxyj.2003.05.018
        摘要：This paper firstly reviews some types of the outside optical fiber cable of the new structures. Then,we outline the structures developing trends of the outside optical fiber cable.  
        关键词：optical fiber cable for outside plant;structure;material   
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      • JIA Weiguo,YANG Xingyu
        Issue 5, Pages: 67-70(2003) DOI: 10.13756/j.gtxyj.2003.05.019
        摘要：The coherently coupled nonlinear Schrdinger （NLS） equation of the propagation of a light pulse in a fiber has been utilized. The propagation characteristic of linearly polarized light in a nonlinear birefringent dispersiondecreasing fiber has been studied. The results show that when a linearly polarized wave propagates in single mode fiber. It may change polarization state due to interaction among linear birefringence,nonlinear effect and chromatic dispersion. It will produce cross phase modulation and lead to phasematched parametric fourphoton mixing .The propagation can be produced not only in the normal dispersion regime but also in anomalous dispersion regime. Furthermore, it will change with propagation distance.  
        关键词：birefringent;DDF;XPM;PMI   
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      • LIU Yumin,YU Zhongyuan,ZHANG Xiaoguang,YU Li,YANG Bojun
        Issue 5, Pages: 71-72(2003) DOI: 10.13756/j.gtxyj.2003.05.020
        摘要：A novel tunable nonlinear chirped fiber grating technology is simulated numerically by Matlab. The nonlinear chirped characteristics can be changed by the variation of the modulation period of the grating. The modulation period can be varied by imposing longitudinal strain, which is realized by the super magnetostriction film in the tunable magnetic field.   
        关键词：chirped fiber grating;nonlinear;super magnetostriction   
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      • DENG Tao,HUANG Dexiu
        Issue 5, Pages: 73-75(2003) DOI: 10.13756/j.gtxyj.2003.05.021
        摘要：In this paper, theoretical model of Lband EDFA is presented; some Lband EDFA experimental data are also given. Analysis shows that theoretical data conform with the experimental results.  
        关键词：L-band;EDFA;simulation;ESA   
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      • Issue 5, Pages: 76-78(2003) DOI: 10.13756/j.gtxyj.2003.05.022
        摘要：This paper gives a general and detailed introduce to the recent progress of fiber Raman amplifier（FRA） in extending transmission length, increasing bit rates, reducing channel space and exploiting new transmission spectrum. Then the lumped Raman amplifier providing high gain in the Sband and broadband spectrum is introduced.  
        关键词：FRA;spectrum efficiency;broadband amplifier;S-band amplifier;high gain   
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