最新刊期
      卷 ， 期 2 ， 2001
      • ZHANG Xu
        Issue 2, Pages: 1-3(2001) DOI: 10.13756/j.gtxyj.2001.02.001
        摘要：The paper begins with describing the progress of multiplexing technology development in telecommunication lines and networks, from electrical FDM to digital TDM and recently to optical WDM. Then, it explains the application of WDM/DWDM on optical fiber transmission lines. Finally, the paper explains the application of WDM in developing new generation optical core network.  
        关键词：wavelength division multiplexing（WDM）;time division multiplex（TDM）;optical fiber transmission line;optical communication network   
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      • FENG Jian he,JI Yue feng,GUAN Ke jian
        Issue 2, Pages: 4-7(2001) DOI: 10.13756/j.gtxyj.2001.02.002
        摘要：Forward error correction （FEC） can improve the performance of optical communications systems, for example, increase link distances, reduce transmitter power requirements and improve the sensitivity of the receiver. The properties of two kinds of FEC （In band FEC and Out of band FEC） are theoretically analyzed and contrasted with each other. FEC can be used in WDM optical network of different rate.  
        关键词：forward error correction;WDM optical network;BCH code;RS code;BER.   
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      • FENG Xian cheng,YUN Xiang,HU Huang qiu
        Issue 2, Pages: 8-12(2001) DOI: 10.13756/j.gtxyj.2001.02.003
        摘要：A new shared access system suitable for medium/high speed Internet access has been developed. This system is based on PON system. By using the new shared access technologies, where a high speed path for computer communication is shared equally by multiple OUNs, high speed path for Internet access can be provided economically.  
        关键词：PON;shared band;Internet access;fairness   
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      • LIU Hui
        Issue 2, Pages: 13-15(2001) DOI: 10.13756/j.gtxyj.2001.02.004
        摘要：With the continuous explosion of data service, there are several alternatives in attempting to meet this demand. In this article, we introduce a new SDH transmission technique having two main characteristics, statistics multiplexing and time division multiplex（TDM）. So this system has the traits of reliability,real time and validity.  
        关键词：statistics multiplexing;TDM;metropolitan area network   
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      • LIN Mian feng,LUO Lai rong,GU Wan yi
        Issue 2, Pages: 16-20(2001) DOI: 10.13756/j.gtxyj.2001.02.005
        摘要：Some issues about network protection in WDM ring, including protection criteria, coordination of protection and detection of network failure, are discussed in detail,some resulted important ideas are given. We advise that automatic protect switch（APS） protocol should be used to coodinate the protection procedure.  
        关键词：WDM ring network;protection criteria;protection coordination;automatic protect switch（APS） protocol   
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      • Issue 2, Pages: 21-24(2001) DOI: 10.13756/j.gtxyj.2001.02.006
        摘要：Several kinds of combined codes are researched. The optical orthogonal codes （OOC’s）, extended quadratic congruence （EQC） code and prime code are all combined with frequency respectively. A kind of combined multi hopping frequency code is firstly proposed. The comparison of capabilities among several codes mentioned above （including single hopping frequency code and multi hopping frequency code for optical CDMA system） is also given.  
        关键词：OOC;EQC code;prime code;single hopping frequency code;multi hopping frequency code   
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      • HU Wei
        Issue 2, Pages: 25-28(2001) DOI: 10.13756/j.gtxyj.2001.02.007
        摘要：Metropolitan area network（MAN） evolved from the computer networks. The development of data communications and other new techniques of telecommunications gave it a new connotation. This paper analyzes the technique requirements for Metro DWDM in terms of system structure , optical fiber technologies ,devices technologies,etc.  
        关键词：optic communication system;optical fiber;optical devices;DWDM;Metro DWDM   
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      • LUO Fang liang,CHEN Ji dong,CHEN Xin qiao
        Issue 2, Pages: 29-31(2001) DOI: 10.13756/j.gtxyj.2001.02.008
        摘要：The prospects of MPLS application in the future IP network is analyzed. It is considered that the main information network can be made up of photo MPLS and electronic MPLS to complete the IP routing, the verge router accomplishes border IP routing switch. This article put forward the realizing method, the base principle and specially the structure of photon MPLS.  
        关键词：MPLS;IP network;switching   
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      • PAN Xiao long 1,ZHAO Zi sen 2
        Issue 2, Pages: 32-34(2001) DOI: 10.13756/j.gtxyj.2001.02.009
        摘要：The development of simulation software for AWG is simply presented. The software is also applied to simulate 1×4 and 4×4 AWG and yields better results.  
        关键词：AWG;BPM;effective index;eigen model   
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      • Issue 2, Pages: 35-38(2001) DOI: 10.13756/j.gtxyj.2001.02.010
        摘要：This paper summarizes the principal techniques of spectral encoding/decoding for optical code division multiple access（OCDMA） including using: （1） grating and mask plate; （2） fiber grating and circulator; （3） arrayed waveguide grating（AWG）; （4）Mach Zehnder interferometer chain. The principle of encoding/decoding and corresponding performances are described in detail.  
        关键词：OCDMA;spectral encoding/decoding;grating and mask plate;fiber grating and circulator;AWG;Mach Zehnder interferometer chain   
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      • LIU Xiu min,YANG Bo jun,ZHANG Xiao guang
        Issue 2, Pages: 39-42(2001) DOI: 10.13756/j.gtxyj.2001.02.011
        摘要：The coupled nonlinear Schrodinger equation in birefringent fibers is solved by means of stepwise Fourier transform, and the influence of polarization mode dispersion（PMD） on NRZ and RZ system is numerically calculated. It is found that the influence of polarization mode dispersion on communication system can be effectively reduced by using RZ having certain pulse width. The optimum pulse width for maximum transmission distance is estimated.  
        关键词：NRZ;RZ;polarization mode dispersion;duty cycle   
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      • YANG Bo jun,LI Chao yang,YU Li
        Issue 2, Pages: 43-46(2001) DOI: 10.13756/j.gtxyj.2001.02.012
        摘要：Polarization mode dispersion （PMD） in optical fibre is a major limiting factor for upgrading in high speed optical communication systems.In this paper,some PMD compensation methods are discribed comprehensively.An automatic PMD compensation system which employs a tunable polarization controller and a polarization maintaining fibre （PMF） is a preferred compensation method .  
        关键词：high speed optical communication;polorization mode dispersion;compensation   
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      • HUANG Long bo,ZHANG Jing,ZHENG Yan sheng
        Issue 2, Pages: 47-50(2001) DOI: 10.13756/j.gtxyj.2001.02.013
        摘要：The solution of the real time supervisory system for optical fiber cable is proposed. This system is made up of sampling the optical signal by optical couple, measuring its optical power, calculating, analyzing and dealing with the results transmitted to the central controller, and showing the calculating data. The central controller can control the turn of optical switch by the analyzing results, and connect OTDR with the troubling optical fiber to test up and down by WDM.  
        关键词：optical fiber cable;supervisor;optical power;optical switch;OTDR   
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      • LIU Chun yang
        Issue 2, Pages: 51-55(2001) DOI: 10.13756/j.gtxyj.2001.02.014
        摘要：This article presented the remote fiber testing system （RFTS） in terms of its structure, test methods and integration with the telecommunication management network （TMN）,gave several typical RFTS in order to explain its application and development trend, lastly, discussed the factors affecting the test accuracy of OTDR as well as the measures to solve the test errors.  
        关键词：remote fiber testing system（RFTS）;optical time domain reflectometry（OTDR）;fiber optic test method （FOTM）;test error   
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      • WANG Xiao feng
        Issue 2, Pages: 56-58(2001) DOI: 10.13756/j.gtxyj.2001.02.015
        摘要：This paper discusses some important factors which affect the optical fiber ribbon planarity during processing,with focus on the influence of UV system structure on the planarity and the improvement of it.  
        关键词：optical fiber ribbon;planarity;cure stove;coating dies   
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      • WANG Yong lin,LU Liang an,LIU Chun yang,WANG Peng,LU Bing zhong
        Issue 2, Pages: 59-62(2001) DOI: 10.13756/j.gtxyj.2001.02.016
        摘要：The paper describes the international optical cable communication lines of the mainland of China, Taiwan Province and Hong Kong, giving a brief introduction to the performances, routes and land sites. The communication routes from Taiwan via Shantou, Chongming to American and other countries are presented in particular.  
        关键词：international optical cable;communication route;land site   
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