最新刊期
      卷 ， 期 2 ， 2006
      • WANG Xiao-ping,WANG Xiao-ming
        Issue 2, Pages: 1-4(2006) DOI: 10.13756/j.gtxyj.2006.02.001
        摘要：The article begins with a brief summary of a high performance broadband information demonstration network（3TNet）,which is followed by the analysis of the development and evolution orientation of optical transmission networks,then an introduction to the networking considerations of the 3TNet Shanghai trial platform and the exploration of the planning and design of its backbone and access networks and finally the description of the trial-platform-based service realization process.  
        关键词：3TNet;OTN;ASON;GEPON;DWDM;E-Shanghai.   
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      • LI Ji-bi,MAO Qi-jian,ZHANG Zhi-zhong
        Issue 2, Pages: 5-7(2006) DOI: 10.13756/j.gtxyj.2006.02.002
        摘要：A new algorithm-2 approximation heuristic algorithm is presented for the scheduling of optical switches with configuration delay,which works by combining two main operations: matching selection and weight decision.Matching selection is achieved by greedy algorithm,which determines the times of the switch,while weight decision decides the holding time of the configuration selected,which is achieved by choosing a value such that the remaining traffic matrix has the best possible cost estimate.The algorithm has an approximation factor of 2 with a time complexity of O（N2logN）.The simulation results demonstrate that this algorithm is close to optimal scheduling and more self-adjustable to various traffic arrival patterns than DOUBLE\ and ADJUST\ algorithms.  
        关键词：optical switch;scheduling algorithm;configuration delay   
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      • ZHANG Guo-bao~
        Issue 2, Pages: 8-9(2006) DOI: 10.13756/j.gtxyj.2006.02.003
        摘要：A novel CWDM array optical receiver module for OLT in WDMA-EPON system is introduced,in which newly-developed hybrid（active & passive） integrated photoelectronic devices are used,realizing the integration of several receivers at multiple wavelengths.This has brought about the benefits of high reliability,low cost and small volume and its sensitivity is better than-34.0 dBm at 155 Mbit/s.  
        关键词：WDMA;EPON;OLT;array optical receiver;hybrid integration   
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      • GUO Wei~1,CHEN Xue~2,DENG Yu~1,GAI Peng-fei~1
        Issue 2, Pages: 10-12(2006) DOI: 10.13756/j.gtxyj.2006.02.004
        摘要：The present study mainly focuses on the realization of clock synchronization,a key technology of E1 over EPON.With an in-depth study of the adaptive method,this article has expounded on an improved way,in which the markers of clock output jitter have been optimized and the QoS of the EPON system effectively ensured.Compared with the time stamp method,the proposed adaptive method for clock synchronization is far more extensively applicable in packet networks.  
        关键词：EPON;clock recovery;PLL;DPLL   
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      • WANG Liang~1,CHEN Fu-shen~1,NIE Wei-qing~2,TANG Xue-dong~1
        Issue 2, Pages: 13-16(2006) DOI: 10.13756/j.gtxyj.2006.02.005
        摘要：As an emerging network access technology,the EPON system needs a carrier-class management capability,which is to be provided by network designers by combining SNMP and OAM protocols as the required OAM capability cannot be acquired only by the SNMP protocol.That is why OAM protocols for the EPON system have been standardized in 802.3ah.In this paper,the EPON system management mechanism,which combines SNMP and 802.3ah OAM protocol is discussed and the functions and features of EPON OAM and its software implementation in Linux described.  
        关键词：EPON;OAM;Linux;software implementation   
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      • ZHANG Peng
        Issue 2, Pages: 17-19(2006) DOI: 10.13756/j.gtxyj.2006.02.006
        摘要：The rapid growth of the Internet has encouraged the continuous emergence of various applications and services.As a flexible carrier,Multi-Protocol Label Switching（MPLS） can not only transmit data,but also voice and multimedia based on its superiorities in RSVP and QoS.In this paper,two principal voice transmission technologies are introduced,comparisons with VoIP in transmission characteristics made and the technological problems and the application prospects of VoMPLS explored.  
        关键词：MPLS;VoIP;RTP;CID   
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      • CAI Kang,LI Hong,ZHU Ying-jun
        Issue 2, Pages: 20-24(2006) DOI: 10.13756/j.gtxyj.2006.02.007
        摘要：A number of approaches have been proposed for the intelligentization of the present fixed networks through the analysis of its present status and in combination with its SHLR technology.Transformation of networks will accelerate that of services,hence the conversion of network operators to integrated operators.The fixed network operators will grow into multiplenetwork integrated operators by using PSTN,NGN and the future 3G network and the diversified competitive superiorities will be resulted by utilizing the existing user scale and services of PSTN for the development of convergent services.The intelligentization of NGN will lead to the covering of PSTN users by NGN services,thus facilitating the seamless evolution and convergence of the PSTN users with the NGN users.  
        关键词：fixed network;SHLR;network intellectualization;softswitch   
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      • HUANG Mei-shan
        Issue 2, Pages: 25-28(2006) DOI: 10.13756/j.gtxyj.2006.02.008
        摘要：The SDH-based MSTP has been the top selection of the operators in the construction of a multiservice metropolitan area network. With the development of new technologies,new services that are emerging endlessly have compelled MSTP to upgrade frequently.On one hand,the optimization of data services have impelled a series of new technologies,such as LCAS,GFP,MPLS and RPR,to turn into business applications;on the other hand,it has become important issues that MSTP must confront how to combine with the on-going large-scale construction of the 3G transmission networks,support the 3G services with low-cost and highly-efficient transmission channels and perform appropriate optimization of them.  
        关键词：metropolitan area integration transmission network;Synchronous Digital Hierarchy（SDH）;Multiple Services Transmit Platform（MSTP）;cost   
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      • Issue 2, Pages: 28-42(2006)
          
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      • LIU Chun-jiang
        Issue 2, Pages: 29-31(2006) DOI: 10.13756/j.gtxyj.2006.02.009
        摘要：With the growth of network broadband users and the next generation internet,the daily-increasing demand for multimedia-related services such as IPTV has activated the popularization and development of IP multicast technology,which has become an essential key technology of the next generation networks.Compared with unicast,the application of IP multicast technology for information distribution can substantially decrease the bandwidth requirements of the entire networks.Starting from the introduction of the various kinds of multicast technologies in IPv6 network,this article describes in details the multicast routing technology of the Protocol Independent Multicast（PIM）,which is widely used in present practical networks,with the emphasis on PIM-SM, the most widely-used in multicast routing.Then,it discusses the operational process of PIM-SM multicast routing protocol in IPv6 networks and ends with its prospects in future IPTV applications.  
        关键词：Protocol Independent Multicast-Sparse Mode（PIM-SM）;Internet Group Management Protocol（IGMP）;rendezvous point;Reverse Path Forward（RPF）   
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      • WANG Jia-Yin,HU Jun
        Issue 2, Pages: 32-34(2006) DOI: 10.13756/j.gtxyj.2006.02.010
        摘要：The hardware structure of layer 3 switch is introduced and particularly a detailed analysis made of its Board Support Package（BSP） and the system booting procedure.The design of the booting leading procedure and the system booting procedure is analyzed and their implementation described.The main functions of BSP and their mutual relationship are illustrated.The BSP for the layer 3 Ethernet switch is optimized.  
        关键词：layer 3 switch;Board Support Package（BSP）;booting image;system image   
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      • GONG Xian-ping,REN Hai-lan
        Issue 2, Pages: 35-38(2006) DOI: 10.13756/j.gtxyj.2006.02.011
        摘要：The basic technologies for the security of optical Ethernet are briefly described and some potential security-related problems in its physical security and the possible preventive measures,and the information security of its data are analyzed in line with its characteristics.Several practical methods for the enhancement of its information security based on the identity authentication and information encryption are proposed.  
        关键词：optical Ethernet;oetwork security;physical security;information security   
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      • YAO Ming-hui
        Issue 2, Pages: 39-42(2006) DOI: 10.13756/j.gtxyj.2006.02.012
        摘要：As VoIP technology is prevailing in the global telecom market,solutions are urgently needed for the security problems of VoIP,which is also the prerequisite for the telecom operators to develop VoIP services.The security of VoIP involves normal offering of services,service confidentiality,authentication of the caller and system security,etc.In this article,the present hazards of VoIP security are analyzed and the appropriate preventative measures proposed.  
        关键词：VoIP;security;IP telephone   
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      • AI Bin,ZHAN Chang
        Issue 2, Pages: 43-45(2006) DOI: 10.13756/j.gtxyj.2006.02.013
        摘要：With the prevalence of broadband access,the multicast services have gradually come into use.IPTV is the most focused service,which needs support by a controlled multicast protocol,but the IGMP（Internet Group Management Protocol） is not a protocol that is capable of self-management.In this article,a solution for the support of IPTV service by the controlled IGMP on IP DSLAM is described and the detailed flow chart presented.  
        关键词：IGMP;controlled IGMP;IPTV;DSLAM   
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      • JI Jian-hua,XU Ming,XIA Lin-zhong,ZHANG Zhi-peng,YANG Shu-wen
        Issue 2, Pages: 46-48(2006) DOI: 10.13756/j.gtxyj.2006.02.014
        摘要：A Modified Prime-hop Code（MPC/PC） is proposed for the two-dimensional synchronous optical CDMA system.The autocorrelation and cross-correlation performances of the code words are analyzed and the Bit Error Rate（BER） and system throughput of the CDMA system studied.Compared with one-dimensional synchronous optical CDMA systems,the two-dimensional system can accommodate much more access subscribers with drastic reduction of BER and remarkable increase of system throughput.  
        关键词：optical code division multiple access（OCDMA）;prime codes;modified prime code;bit error rate（BER）;throughput   
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      • GUO Jian-bing~
        Issue 2, Pages: 49-51(2006) DOI: 10.13756/j.gtxyj.2006.02.015
        摘要：Signal acquisition and tracking is a key technology in wireless communications.A signal acquisition and tracking scheme has been designed for spread-spectrum satellite communications,which consists of pseudonoise code acquisition and tracking and carrier acquisition and tracking.Theoretical analysis has been made of the performances of the modules and the scheme verified by using a prototype receiver based on FPGA for its feasibility and robustness.  
        关键词：receiver;acquisition;tracking   
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      • Chen Wei,LI Jin-yan,LI Shi-yu,LI Hai-qing,JIANG Zuo-wen,PENG Jing-gang
        Issue 2, Pages: 52-54(2006) DOI: 10.13756/j.gtxyj.2006.02.016
        摘要：The kinds and applications of Micro-structured Optical Fibers（MOF） for FTTH used abroad are described and the properties of micro-structured bend-resistant fibers analyzed in respect of bending-loss,attenuation,splicing loss and life expectancy,which shows that they can be flexibly installed in places with narrow space,small bending diameter and many bending points,and satisfy the need for the development of FTTH optical networks.  
        关键词：FTTH;Micro-structured Optical Fiber（MOF）;bending insensitivity   
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      • CAO Jun-zhong,WANG Zhi,LIU Jian-fei,LIU Yan-ge,DONG Xiao-yi
        Issue 2, Pages: 55-57(2006) DOI: 10.13756/j.gtxyj.2006.02.017
        摘要：The photonic crystal fiber（PCF） has become one of the hot spots of research in recent years because of its unique optical properties and flexible designs.With the development of various new types of PCF and their deep-going researches,they are being applied more and more extensively. In this paper,analysis of the applications of PCF in all-optical networks is made and the progress of their development in fiber grating,fiber laser,fiber amplifier,optical switch,wavelength converter reviewed in detail.  
        关键词：photonic crystal fiber（PCF）;nonlinear optics;all-optical network;photoelectronic device;fiber grating   
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      • DENG Tao~1,CHEN Hai-tao~2
        Issue 2, Pages: 58-60(2006) DOI: 10.13756/j.gtxyj.2006.02.018
        摘要：After taking into account the phase distribution of the Fiber Grating（FG） and starting from the threshold condition of the Fiber Grating External Cavity Semiconductor Laser（FGESL）,the influence of the front facet（facing the FG） reflectivity on the lasing wavelength variation of the Long-External-Cavity Fiber Grating Semiconductor Laser（LECFGSL） with the ambient temperature has been investigated theoretically.The numerical simulations show that,with the ambient temperature variation,the lasing wavelength of the LECFGSL will fluctuate around the FG Bragg reflection wavelength;the front facet reflectivity has an obvious influence on the fluctuation amplitude of the lasing wavelength,and when the front facet reflectivity is less than 10-4,the lasing wavelength of the LECFGSL is nearly equal to the Bragg reflection wavelength of the FG.  
        关键词：LECFGSL;lasing wavelength;front facet reflectivity;temperature stability   
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      • CHEN Li-bing,YANG Bing,ZHANG Yang-an,HUANG Yong-qing,LI Ling,REN Xiao-min
        Issue 2, Pages: 61-64(2006) DOI: 10.13756/j.gtxyj.2006.02.019
        摘要：This article gives an outline of dynamic reconfigurable optical add/drop multiplexer（ROADM）.A brief analysis and classification have been made of a variety of solutions for the implementation of ROADM.Three typical structures of Demux/Switch/Mux（DSM）,DSM band,and the "Broadcast and Select"（B&S） are described in details.B&S-based ROADM has been designed and implemented.The add/drop and dynamic channel equalization functions in the experimental system are verified.  
        关键词：dynamic reconfigurable;Optical Add/Drop Multiplexer（OADM）;broadcast and select;channel equalization   
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      • JIANG Xiang~
        Issue 2, Pages: 65-67(2006) DOI: 10.13756/j.gtxyj.2006.02.020
        摘要：A 622 Mbit/s TIA integrated circuit with AGC and AOC for optical communications is proposed.SMIC 0.25 μm 1P3M CMOS process is applied in the design.HSPICE simulation shows that in all the worst cases,the floating region of TIA initial gain is between-10.2% and 9.7%,and the floating region of initial AGC bias voltage between-0.384% and 0.307%.  
        关键词：analog circuit;transimpedance amplifier;optical communication;CMOS   
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      • ZHOU Min-juan,SUN Jun-qiang
        Issue 2, Pages: 68-70(2006) DOI: 10.13756/j.gtxyj.2006.02.021
        摘要：An all-optical wavelength conversion based on the cascaded second-order nonlinear interactions of Sum-and Difference-Frequency Generation（SFG+DFG） in quasi-phase matched Periodically Poled LiNbO3（PPLN） Waveguides with a dual-pulse pump source is studied.A theoretical model for the description of the SFG+DFG wavelength conversion is developed.The process of the wavelength conversion is analyzed by numerical simulation and walk-off effect and pulse broadening have been observed in pulse propagations.The study shows that the conversion efficiency is affected by the length of the waveguides, signal wavelength and pulse width.  
        关键词：Periodically Poled LiNbO3（PPLN） Waveguides;cascaded second-order nonlinear interactions;All-Optical Wavelength Conversion（AOWC）   
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