最新刊期
      卷 ， 期 1 ， 2004
      • YANG Zhu,ZENG Hui,ZHANG Qiang,LIU Xian-bing,YAO Wei
        Issue 1, Pages: 1-4(2004) DOI: 10.13756/j.gtxyj.2004.01.001
        摘要：This paper introduces the transmission experiment of 10 Gbit/s CSRZ code over actual 3 040 km G.652 fiber line. The system has a bit rate of OTU2 format accordance with G.709, employs the distributed Raman amplification technology. The experimental results show that after 3 040 km transmission, Q value is lager than 4.76, the optical path penalty is smaller than （1.78 dB,）and the system runs error free for continuous 48 hours.  
        关键词：carrier-suppressed return-to-zero（CSRZ） code;ultra long haul （ULH）;optical transmission;DRA   
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      • YANG Ming,ZHANG Lu,LIU Hong-jie
        Issue 1, Pages: 5-8(2004) DOI: 10.13756/j.gtxyj.2004.01.002
        摘要：The transmission performance of nonreturn-to-zero（NRZ） and carried-suppressed return-to-zero（CSRZ） in 40 Gbit/s single channel systems over 6×80 km G.652 fiber is described in this paper. The bandwidth requirement of optical and electrical filter of receiver is analyzed for NRZ and CSRZ formats. The comparison of power penalty in different fiber-input power of NRZ and CSRZ and residual dispersion of the two formats is investigated. It shows that the transmission performance of CSRZ is better than that of NRZ in high-speed systems.  
        关键词：NRZ;CSRZ;Q factor;power penalty   
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      • LI Lei,LU Jun
        Issue 1, Pages: 9-12(2004) DOI: 10.13756/j.gtxyj.2004.01.003
        摘要：With the development of telecommunication technologies, all kinds of intelligent services have been widely applied, and technologies for IN have been developed quickly. At the same time, IN technologies have many shortcomings too. This paper gives the architecture of traditional IN, integrated IN and OSA, then analyzes their advantages and disadvantages systematically and points out the inevitability of evolution from traditional IN to OSA.  
        关键词：intelligent network（IN）;integrated intelligent network;open service access（OSA ）;parlay gateway   
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      • ZHANG Yue-sheng~1,HU Chun-lin~2
        Issue 1, Pages: 13-14(2004) DOI: 10.13756/j.gtxyj.2004.01.004
        摘要：In recent years, broadband metro network construction plans have been proposed by major telecom operators. How to adopt the appropriate technology depends on different factors. In this paper, some metro network technologies are introduced and discussed from both technological and economical points of view.  
        关键词：metro network;Ethernet;MSTP;DWDM;RPR   
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      • PAN Deng,JI Yue-feng
        Issue 1, Pages: 15-17(2004) DOI: 10.13756/j.gtxyj.2004.01.005
        摘要：Optical Internet is a compact, efficient and ecomonic architecture for future communication networks, therein the traffic engineering is an important aspect. This article indicated the deficiencies of overlay model on the basis of the analysis of traffic engineering in IP layer and optical layer, proposes integrated traffic engineering in optical Internet,and discussed how to optimize the traffic engineering in IP layer optical layer for obtaining the minimal total traffic engineering cost.  
        关键词：optical Internet;traffic engineering;MPLS   
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      • LIU Kun-hong,XU Yong
        Issue 1, Pages: 18-20(2004) DOI: 10.13756/j.gtxyj.2004.01.006
        摘要：Traffic grooming is one of the most important and hot problems in the area of optical networks. The technique of traffic grooming in WDM network helps minimizing the cost of a network and alleviates the burden of end equipments. In this paper we discuss the necessity and classification of the grooming of dynamic traffic and provide a thorough survey of this problem. Finally, we present the future research direction.  
        关键词：WDM;dynamic traffic grooming;add/drop multiplexer   
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      • XU Yun-bin,ZHANG Jie,GU Wan-yi
        Issue 1, Pages: 21-24(2004) DOI: 10.13756/j.gtxyj.2004.01.007
        摘要：The optical virtual private network（OVPN） is a new value-added service provided by optical network, the intelligence of optical network also bring about new functions to the OVPN, the OVPN’s customers could obtain the dynamic bandwidth providing through the control plane in the provider’s network. The realization of management of the OVPN is analyzed in this paper. Firstly, a management architecture of the OVPN based on JMAPI is proposed, then the core managed objects （MO） models and the Event Notifications used for the OVPN management are also provided.  
        关键词：optical virtual private network （OVPN）;provider edge optical network element （PE-ONE）;client edge element （CE）;Java management API （JMAPI）   
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      • Issue 1, Pages: 25-28(2004) DOI: 10.13756/j.gtxyj.2004.01.008
        摘要：An algorithm to improve the bandwidth utilization for EPON by using dynamic bandwidth distribution is put forward. System performance, such as queuing delay under self-similar traffic, is simulated by using OPNET. The simulation results prove the advantage of the algorithm.  
        关键词：PON;EPON;maximum transmission window;dynamic bandwidth distribution   
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      • ZHANG Qiang,XI Shen-e,YANG Ming,YANG Zhu
        Issue 1, Pages: 29-30(2004) DOI: 10.13756/j.gtxyj.2004.01.009
        摘要：The experiment results of super FEC which was applied in 160×10 Gbit/s optical transmission system over 3 040 km on （G.652）fiber is described in this paper.We analyzed the improvement of super FEC in terms of both BER and optical penalty, and compared super FEC with standard FEC in OSNR requirement in WDM ultra long-haul system.  
        关键词：WDM;super FEC;ultra-long-haul;OSNR   
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      • YANG Tao-tao,YIN Xin-da,FU Cheng-peng,HE Wan-hui
        Issue 1, Pages: 31-32(2004) DOI: 10.13756/j.gtxyj.2004.01.010
        摘要：In this paper, the application of the hybrid optical amplifier in long-haul transmission system is discussed. The hybrid amplifier consists of a distributed Raman amplifier and an erbium doped fiber amplifier, of course a tunable filter. System sensitivity can be improved to -37.5 dBm after 160km’s transmission without FEC. Two other system configurations are also discussed and the advantage of the hybrid optical amplifier is analyzed in theory.  
        关键词：Raman amplifier;hybrid amplifier;long distance transmission   
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      • LI Wei~1,LIU De-ming~1,HU Qiang-gao~2,HUANG De-xiu~1
        Issue 1, Pages: 33-36(2004) DOI: 10.13756/j.gtxyj.2004.01.011
        摘要：Technologies for dynamic gain equalization can improve the DWDM system transmission performance and overcome the system ONSR degradation due to the accumulation of ASE noise and gain ripple in cascade amplifier chain, dynamically equalize the channel power difference due to wavelength add/drop, etc. In this paper, several dynamic gain equalization component technologies and the importance in DWDM system are reviewed, especially in fabrication technique, performance comparison and future trends.  
        关键词：DWDM;dynamic gain equalization;channel power equalization;EDFA   
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      • CHEN Lin,YANG Bo-jun,ZHANG Ru,ZHANG Xiao-guang
        Issue 1, Pages: 37-38(2004) DOI: 10.13756/j.gtxyj.2004.01.012
        摘要：This paper analyzed the features of PMD in DWDM optical communication system and the difficulty of using single signal channel PMD compensation in DWDM system, put forward a compensation method based on worst channel compensation and the monitoring method for compensating PMD in DWDM multichannel system, the feasibility of this method are also disscussed.  
        关键词：DWDM;PMD;PMD compensation   
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      • LIU Hong-jie,YANG Ming
        Issue 1, Pages: 39-40(2004) DOI: 10.13756/j.gtxyj.2004.01.013
        摘要：This paper described four methods to mitigate PMD for high speed optical fiber communication system. It also propounded the viable means for the present.  
        关键词：PMD;power penalty;code pattern;polarization diversity receiver   
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      • ZHOU Guang-tao,SHEN Yu,LI Chao-yang,ZHENG Yuan,ZHANG Xia-guang,YANG Bo-jun
        Issue 1, Pages: 41-43(2004) DOI: 10.13756/j.gtxyj.2004.01.014
        摘要：This paper reports an quick adaptive feedback compensation experiment system for compensating the polarization mode dispersion （PMD） in 2.5 Gbit/s optical communication link. It only takes 1～2 s to compensate 55 ps differential group delay （DGD） perfectly.  
        关键词：high speed optical communication;PMD;automatic compensation   
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      • JIN Jian-gang,YAN Juan-juan,ZHOU Ming-yuan,LI Wen-di,CHEN Ming-hua,XIE Shi-zhong
        Issue 1, Pages: 44-47(2004) DOI: 10.13756/j.gtxyj.2004.01.015
        摘要：In this paper, the application of optical transmission unit（OTU） is studied. A kind of design of OTU and its workflow is also put forward in this paper.  
        关键词：OTN;OTU;digital wrapper   
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      • ZHANG Yu,GE Ning,WANG Yi-chao
        Issue 1, Pages: 48-51(2004) DOI: 10.13756/j.gtxyj.2004.01.016
        摘要：E1 is a typical service in SDH networks, and E1/SDH mapping is needed nearly by every SDH equipment. In this paper, based on the analysis of SDH frame and E1 mapping mechanism, a novel method is proposed for implementing E1 mapping. It utilizes TDM and shared RAM to minimize FIFO and logic resources, which helps implemention of E1 mapping in access equipments at low cost.  
        关键词：SDH;pointer;FIFO;TDM   
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      • ZHANG Wei,HUANG Ben-Xiong,LIANG Ai-hong
        Issue 1, Pages: 52-54(2004) DOI: 10.13756/j.gtxyj.2004.01.017
        摘要：This article analyses the evaluation of CDMA network optimization and optimum parameters, analyses the phenomena of call loss, and put forward the relationship between correct use of repeaters and network optimization on the basis of this theory.  
        关键词：network optimization;CDMA;Ec/Io;PN code   
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      • ZHENG Peng~1,HE Gui-ming~1,ZHU Li-wu~2
        Issue 1, Pages: 55-57(2004) DOI: 10.13756/j.gtxyj.2004.01.018
        摘要：In this paper, a new SFP based on protocol 802.3ab are discussed. First, the paper described the design rules of 1000 Base-T SFP from the aspects of circuitry design, PCB design and EMC design. Following the design rules, we fabricated high performance 1000Base-T SFP which can transmit the signal of 1 000 Mbit/s over the Category 5 cable up to 180 meters in full duplex transmission mode, and has 10/100/1 000 Mbit/s adaptive ability.  
        关键词：1000 Base-T;small form-factor pluggable（SFP）;stripline   
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      • CUI Xin-you,FU Yong-an,ZHOU Ri-kai,ZHANG Zhi-gang,LIU Jun
        Issue 1, Pages: 58-60(2004) DOI: 10.13756/j.gtxyj.2004.01.019
        摘要：Based on the fact that dielectric film filter is minimum phase filter, this paper provided a method to reconstruct phase response from its amplitude response and then for the group velocity delay （GVD） and the chromatic dispersion. At last, the theoretical analysis was proven by experiment.  
        关键词：dielectric film filter;infinite impulse filter （IIR）;phase reconstruction;group velocity delay （GVD）;group velocity dispersion.   
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      • WANG Qing~2,ZHAO Lu-min~3,NING Yong-qiang~2,QIN Li~2,YAN Chang-ling~2,WANG Li-jun~
        Issue 1, Pages: 61-63(2004) DOI: 10.13756/j.gtxyj.2004.01.020
        摘要：Vertical-cavity surface-emitting lasers have the potential to become the new light source in information age for their excellent performance.This article presents a review of the progress that VCSELs have made for optical communications.  
        关键词：vertical cavity surface emitting laser（VCSEL）;distributed Bragg reflectors（DBR）;MEMS;WDM;optical communications   
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      • XIN Xiang-jun~1,YU Chong-xiu~1,REN Jian-hua~1,LI An-jian~1,WU Qiang~1,WANG Chuan-lin~1,XIN Yu~1,ZHENG Wen-xiao~1,RUAN Shuang-chen~2,DU Ge-guo~2,XIN Gang~3,YANG Xiao-qiang~3
        Issue 1, Pages: 64-67(2004) DOI: 10.13756/j.gtxyj.2004.01.021
        摘要：Dual wavelengths and three wavelengths forward-pumped Raman fiber amplifiers were realized. Twenty channels in the C band ranging from 1 537.377 to 1 560.605 nm on the ITU-T grid were used as the incident signals of DRA. 100 km and 75 km transmission links were adopted respectively. The gain ripple of three wavelengths pumping configuration is below 1.47 dB and the lowest OSNR is 32.5 dB, which is better than that of backward pumping configuration. The gain saturation was experimentally studied in detail. The experimental result showed that the increment of gain would decrease the saturation power of signals and the gain saturation phenomena would be strengthened by the increased gain. The saturation power of two wavelengths pumped RFA was about 5 dBm.  
        关键词：Raman fiber amplifier（RFA）;on-off gain;OSNR;NF   
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      • PAN Wei-qing,HE Dui-yan,CHEN Sheng
        Issue 1, Pages: 68-70(2004) DOI: 10.13756/j.gtxyj.2004.01.022
        摘要：In order to diminish the crosstalk and power loss of asymmetric X-junction coupler and increase the angle of asymmetric area for separating mode, an improved design of asymmetric X-junction coupler is proposed. The beam propagation method and effective index method are used to simulate and analysis the crosstalk and power loss of improved asymmetric X-junction coupler. The result shows that the crosstalk of improved X-junction has been greatly diminished and the power loss has been ameliorated.  
        关键词：asymmetric X-junction;optic waveguide;crosstalk   
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