最新刊期
      卷 ， 期 3 ， 2001
      • YANG Zhi yong 1,YANG Zhu 2
        Issue 3, Pages: 1-3(2001) DOI: 10.13756/j.gtxyj.2001.03.001
        摘要：This paper introduces the importance, characteristic and implementation of FEC in high speed fiber optical communication. At last, briefly explains the improvements for the system performance.  
        关键词：FEC;code gain;RS code;BCH code;convolution code;EDFA   
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      • YU Jian guo
        Issue 3, Pages: 4-7(2001) DOI: 10.13756/j.gtxyj.2001.03.002
        摘要：The development objective, direction and function of optical time division multiplexing （OTDM） are analyzed in this paper. The key technology, the mature degree of devices and the existing problems are also analyzed.  
        关键词：OTDM;electroadsorption;SOA;narrow pulse   
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      • SUN Jun
        Issue 3, Pages: 8-11(2001) DOI: 10.13756/j.gtxyj.2001.03.003
        摘要：Routing and wavelength assignment algorithms for NCWDM all optical networks are studied in this paper. Through analysis and comparison, a new adaptive dynamic minimum hop routing algorithm （ADMH） is proposed. The algorithm is based on DMH and takes the network statement into consideration, so that it can not only use network resources as little as possible but also keep the network resources as balanced as possible. The simulation results show that the performance is good than or equal to some existent algorithms for different network parameters.  
        关键词：WDM;all optical networks;RWA;wavelength routing   
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      • YE Dong xiang,JIANG Zhong ao
        Issue 3, Pages: 12-16(2001) DOI: 10.13756/j.gtxyj.2001.03.004
        摘要：Discuss the potential applications of optical technologies and identify their fundamental roles in basic transport network functions. It is demonstrated that the instruction of optical layers not only offers quantum leaps in both transmission capacity and routing node throughput simultaneously, but also allows effective accommodation of different signal formats and protocols. Next, the transport capability of large capacity WDM system is shown, and the effect of fiber amplifiers and nonlinearity is discussed. Finally, the technologies needed to realize reliable communication is clarified, and the optical network protection strategy is discussed.  
        关键词：WDM;wavelength routing;hybrid amplifier;fiber nonlinear effect;OTU;OTM   
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      • XIE Guang 1,ZHANG Xin liang 2,GONG Wei 1,FU Yan feng 1,SUN Jun qiang 2,LI Tong ning 1
        Issue 3, Pages: 17-19(2001) DOI: 10.13756/j.gtxyj.2001.03.005
        摘要：The basic principle of all optical wavelength conversion based on cross gain modulation in semiconductor optical amplifier is analyzed and the wavelength conversion experiment has been performed for 2.5 Gbit/s NRZ optical pulse using XGM. The up conversion space is more than 14 nm. The eye diagram of the converted signal is very clear and apparently open. The extinction ratio and the optical signal to noise ratio are also more than 10 dB and 30 dB, respectively.  
        关键词：WDM;wavelength conversion;semiconductor optical amplifier（SOA）;cross gain modulation（SOA）;EX;OSNR   
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      • XU Rong,GONG Qian,JI Yue feng,YE Pei da
        Issue 3, Pages: 20-24(2001) DOI: 10.13756/j.gtxyj.2001.03.006
        摘要：For constructing IP over photonic systems, an IP via MPLS over WDM based broadband IP network architecture and protocol is proposed and analyzed, which supported label switching and wavelength routing. The proposed approach combines recent advance in MPLS traffic engineering control plane with optical networking technologies. It is particularly advantageous for reconfigurable OADMs/OXCs intended for data centric optical internetworking systems. In such environments, it will pave the way for the eventual incorporation of DWDM multiplexing capabilities in IP routers.  
        关键词：MPLS （Multi Protocol Label Switching）;IP via MPLS over WDM;wavelength switching networks;optical MPLS;broadband IP networks   
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      • WU Cui xian 1,GUO Jun neng 2
        Issue 3, Pages: 25-28(2001) DOI: 10.13756/j.gtxyj.2001.03.007
        摘要：This paper describes how to manage and maintain the optical network unit,including the OTMX,OADM,OXC,OLA. And then we discuss the relationship between the transparency of the optical network and its management and maintenance. Lastly,we study some issues on how to implement the WDM based WAN.  
        关键词：optical transport network;OADM;OXC;OLA   
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      • XIA Bing 1,SHEN Dan xun 2
        Issue 3, Pages: 29-31(2001) DOI: 10.13756/j.gtxyj.2001.03.008
        摘要：Now the architecture of SDH transport network is becoming more and more complex. To establish photonic path and electronic path quickly through SDH transport network management system, this paper presents a photonic path routing algorithm and a electronic path routing algorithms. The algorithms are based on the photonic path/electronic path layering model, and a appropriate route can be gotten quickly through the algorithms. At last this paper analyzes the algorithms briefly.  
        关键词：route;transport network;network management   
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      • LIANG Hong wen,DONG Tian lin
        Issue 3, Pages: 32-34(2001) DOI: 10.13756/j.gtxyj.2001.03.009
        摘要：This paper presents the function and design procedures of 2×STM 4 optical interface board in 2.5 Gbit/s SDH system. The 2×STM 4 optical interface board is characterized by high integration and better performance.  
        关键词：optical synchronous digital transmission network;STM 4 optical interface   
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      • CHEN Ya hua 1,LIU Jin gao 2,ZHAO Wen wu 2,BIAN Yu cun 2
        Issue 3, Pages: 35-38(2001) DOI: 10.13756/j.gtxyj.2001.03.010
        摘要：This paper uses artificial intelligence methods to optimize the PON topology. The simulation experiments of PON systems such as FPX 1000 are carried out. The genetic algorithm （GA）,add algorithm （AA） and Hopfield net approach （HNA） are compared,The simulation results show that GA is better than AA and HNA. GA can minimize installation cost of PON and realize the optimization of the passive optical networks with satisfaction.  
        关键词：passive optical network;genetic algorithm;add algorithm;Hopfield net approach;network planning   
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      • ZHU Li wu,LI Zhi tang
        Issue 3, Pages: 39-42(2001) DOI: 10.13756/j.gtxyj.2001.03.011
        摘要：The aim of the article is to analyze the practice of several wideband IP access techniques used in residential areas and find out their merits and demerits. It points out, therefore, some primary problems are awaiting solutions urgently. This article also provides information about some new IP access router of FiberHome Network, which help to form the solution to wideband IP access network.  
        关键词：IP;router;access network   
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      • ZHENG Da li
        Issue 3, Pages: 43-46(2001) DOI: 10.13756/j.gtxyj.2001.03.012
        摘要：In this paper, the optimizing methods for the transmission network have been researched based on the practice of the City of Baotou.  
        关键词：network;optimizing;partitioning;layering;protection   
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      • WANG Jing,MIAO Hong li
        Issue 3, Pages: 47-50(2001) DOI: 10.13756/j.gtxyj.2001.03.013
        摘要：The influence of the third order dispersion on the time delay difference in high birefringent optical fibers is studied through nonlinear coupling mode equations. It is shown that when the effects of the second order dispersion and the third order dispersion exists simultaneously, the third order dispersion can decrease the time delay difference. When the third order dispersion effect exists,the more time delay difference is produced and the dispersion waves are produced at both the front and back edge of the pulse.  
        关键词：third order dispersion;time delay difference;high birefringent optical fibers;polarization mode dispersion   
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      • TANG Ren jie
        Issue 3, Pages: 51-55(2001) DOI: 10.13756/j.gtxyj.2001.03.014
        摘要：The transmission rate of LANs based on Ethernet protocol is quickly upgrading to 1 Gbit/s and 10 Gbit/s. The demand on the fiber specification will become more stringent. Now, IEEE is establishing the 10 Gbit/s Ethernet standard. This standard will adopt the next generation multimode fiber （NG MMF） as transmission medium. First, this paper outlines the development background of the NG MMF, and then, the concept of NG MMF, the new method for band width measurement of NG MMF and the processes for manufacturing the NG MMF.  
        关键词：LAN;Ethernet;next generation multimode fiber（NG MMF）;restricted mode launch （RML）;inside vapor depositios（IVD）   
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      • Issue 3, Pages: 55(2001) DOI: 10.13756/j.gtxyj.2001.03.015
          
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      • HU Xian zhi 1,JIANG Li min 2
        Issue 3, Pages: 56-58(2001) DOI: 10.13756/j.gtxyj.2001.03.016
        摘要：This paper introduces new type fibers for metropolitan networks briefly.It is also described the key technologies and the fiber properties, and the application examples in metropolitan networks.  
        关键词：metropolitan networks;WDM;optical fiber   
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      • TONG zhi,WEI huai,JIAN Shui sheng
        Issue 3, Pages: 59-62(2001) DOI: 10.13756/j.gtxyj.2001.03.017
        摘要：This paper studied several major noises of Raman amplifiers,analysed the source and the characater of the noises,and gave equations described the noise.At the same time we mode calculation with numerical analysis. At last, we proposed some improvement methods.  
        关键词：fiber Raman amplifier;ASE;crosstalk;Rayleigh scattering   
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