最新刊期
      卷 ， 期 5 ， 2004
      • LI Yan-jun~1,HONG Xiao-bin~2,YU Jian-guo~2,WU Jian~1,LIN Jin-Tong~1
        Issue 5, Pages: 1-5(2004) DOI: 10.13756/j.gtxyj.2004.05.001
        摘要：In this paper,we focus on the study of the characterization of IP（Internet Protocol） traffic and burst assembly mechanism in OBS networks,introduce a ON/OFF sources model to describe the self-similar data traffic in OBS networks. Through simulation,we proved the correctness of the ON/OFF source model. Finally,we analysed several assembly algorithms,and the result shows that these algrorithms do not change the traffic’s self-similar,it only change the traffic’s short-term properties.  
        关键词：OBS;self-similar;assembly;ON/OFF source;assembly algorithms   
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      • ZHAO Jian-li,JI Yue-feng
        Issue 5, Pages: 6-8(2004) DOI: 10.13756/j.gtxyj.2004.05.002
        摘要：An optical wavelength switch based on all-network-synchronous time slot is researched. And the basic network architecture,its advantages,RWA problems are described in detail, the analysis of performance improvement is also conducted considering its application in ring, with a graph on performance improvement offered as result. Our conclusion is that this switching mode has a high performance/cost ratio.  
        关键词：ASON;OBS;optical switch;IP over WDM;time slot;TWRN   
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      • ZHANG Wan-hong~1,SUN Wei-feng~1,WANG Ya-min~1
        Issue 5, Pages: 9-11(2004) DOI: 10.13756/j.gtxyj.2004.05.003
        摘要：This article put forward a modified JET protocol （MJET protocol） which supports QoS, a MJET-based burst switching format, a offset time set-up algorithm and a node control algorithm. At the end, the simulation result of realization of this protocol through the optical composite burst switching （OCBS） was given.  
        关键词：OBS;OCBS;AON   
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      • TIAN Guang-li,LI Guang-cheng,XU Yan-fen
        Issue 5, Pages: 12-14(2004) DOI: 10.13756/j.gtxyj.2004.05.004
        摘要：This paper lays stress on discuss the scheme to realize the NEMS （Network Element Management System） of ASON （Automatically Switched Optical Network ） based on SDH transport NMS after analyzing the functional request of NMS for ASON.  
        关键词：ASON;network management system;network element;design   
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      • HE Jun~1,LI Yong~2,LI Wei~1,LIU De-ming~1
        Issue 5, Pages: 15-16(2004) DOI: 10.13756/j.gtxyj.2004.05.005
        摘要：In a wavelength routing optical networks （WRON）, wavelength converters can greatly enhance the fiber utilization and reduce the overall call blocking probability of the networks. But wavelength converters are very expensive nowadays. So the optimal utilization of wavelength converters is an important question in optical network configuration. This paper resolved this question by using genetic algorithm （GA）. We calculated the blocking probability of optimal configuration in NSFNet with simulation. Considering normal genetic algorithm’s shortcomings, we proposed an enhanced genetic algorithm （EGA）. At last two GAs’s performances were compared by simulation.  
        关键词：WDM optical network;optical wavelength conversion;genetic algorithm;blocking probability   
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      • YE Hui-ying~1,CHANG Yi-ping~1
        Issue 5, Pages: 17-18(2004) DOI: 10.13756/j.gtxyj.2004.05.006
        摘要：Cross-phase modulation （XPM） is introduced in this paper. The effect of XPM on first order polarization mode dispersion compensation in WDM system is also analyzed, which induces PSP change. Based on PMD model in simple WDM system （two channels） the performance of first order PMD compensation is numerically simulated. In this paper, we give the diagrams with XPM and without PMD. It can be seen that the XPM reduced the eyeopening to some extent, resulting in weakening the performance of first order compensation.  
        关键词：PMD;XPM;WDM;numerical simulation   
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      • ZHOU Fang
        Issue 5, Pages: 19-22(2004) DOI: 10.13756/j.gtxyj.2004.05.007
        摘要：This paper firstly introduces the basic concept of virtual concatenation in SDH briefly, then analyzes the realization course of virtual concatenation on SDH, and finally records simulation process with VHDL.  
        关键词：SDH;Ethernet;virtual concatenation;simulation   
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      • ZHANG Tao,LI Ling
        Issue 5, Pages: 23-26(2004) DOI: 10.13756/j.gtxyj.2004.05.008
        摘要：Associated with ITU-T Draft Recommendation G.GPON.gtc about Gigabit-capable Passive Optical Networks （GPON）: Transmission Convergence Layer Specification, a medium access control （MAC） controller that support the transmission of packet-oriented traffic to suite emerging PONs at Gigabit rates is presented in this paper. The characteristics are analyzed through system simulation.  
        关键词：passive optical network（PON）;medium access control;DBA   
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      • HU Chun-lin
        Issue 5, Pages: 27-29(2004) DOI: 10.13756/j.gtxyj.2004.05.009
        摘要：PON is a rising technology in the broadband fiber access network. APON/BPON, EPON and GPON　are driving the further development of PON. This paper reviews the developing process of PON, introduces and compares the three kinds of broadband PON, namely APON, EPON and GPON.  
        关键词：PON;APON;EPON;GPON   
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      • WANG Yang,ZHOU Zhen
        Issue 5, Pages: 30-32(2004) DOI: 10.13756/j.gtxyj.2004.05.010
        摘要：Very-high-speed digital subscriber line（VDSL） is the fastest access technology of the xDSL family.The new VDSL system’s bandwidth can reach 100 Mbit/s on a single telephone wire pair.It can provide very high symmetric and asymmetric bandwidth.Because of the high rate,the transmission distance of the VDSL is shorter than the other DSL technology.The mode of the modulation is the key technique. At present,There are two different modulation mode（DMT and QAM/CAP mode）.This article explains the two modulation modes,and compare the excellence and the disadvantage of these modes.  
        关键词：VDSL;MODEM;QAM;DMT   
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      • AI Xing-fang,YUAN Xiu-hua,CHEN Wen-jing
        Issue 5, Pages: 33-35(2004) DOI: 10.13756/j.gtxyj.2004.05.011
        摘要：The principle of OCDM is introduced and the usual OCDM technologies are analysed and compared. A new OCDM technology of QPSK coherent phase encoding in time domain for Tbit/s ultra-fast optic fiber transmission system is proposed　according to family a of 4-phase sequences, which can improve the transmission rate and spectral efficiency greatly. Four optical codes with good orthogonality are selected through numerical simulate calculation.  
        关键词：OCDM;WDM;QPSK;phase encoding;encoder/decoder   
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      • JI Jian-hua,XU Ming,ZHOU Jian-hua,YANG Shu-wen
        Issue 5, Pages: 36-37(2004) DOI: 10.13756/j.gtxyj.2004.05.012
        摘要：The effect of dispersion on normalized throughput of multi-wavelength optical code-division multiple-access（MW OCDMA） system is analyzed. The smaller the chip width of optical pulse is, the more serious the dispersion effect is and the more greatly does the maximum normalized throughput of MW OCDMA decrease. The performance of MW OCDMA is compared to that of a wavelength-division multiple-access （WDMA） system after considering the effect of dispersion and multi-access interference. Analysis result shows that when load is small,WDMA has better performance. However, MW OCDMA has better performance than WDMA when load is large.  
        关键词：MW OCDMA;WDMA;prime-hop sequence;bit error rate;throughput   
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      • GAO Zhi-qiang~1,MA Hong~1,JI Xin-sheng~1,ZHANG Peng~2
        Issue 5, Pages: 38-40(2004) DOI: 10.13756/j.gtxyj.2004.05.013
        摘要：This paper describes the softswitch, signaling gateway and M3UA firstly. Then, it discusses the realization of M3UA which uses the thinking of modularization. Through invoking these modules, it implements the function of M3UA in SG. Lastly, this paper describes the interface primitive of M3UA and the security of softswitch network.  
        关键词：softswitch;signaling gateway;M3UA;implementation   
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      • YE Lei,LU Jun,CAO Li
        Issue 5, Pages: 41-43(2004) DOI: 10.13756/j.gtxyj.2004.05.014
        摘要：Beginning with the brief description of the history of the emergence of network processor, this paper analyzed some features and functions of network processor. After that, the evolution of network processor is introduced through analyzing the system architecture of it. In the last part of this paper, several mainstream productions are introduced and a description of future development of network processor is given.  
        关键词：network processor;application specific integrated circuit;reduced instruction set computer;wire speed   
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      • LIU Yan-bo,YANG Bo,Wang Bin
        Issue 5, Pages: 44-46(2004) DOI: 10.13756/j.gtxyj.2004.05.015
        摘要：This paper presented an introduction to the design process and realization method of the USB2.0-based remote optical card, with focus on the programming of firmware, the realization of FPGA and the development of driver; in particular described in detail the inner structure of FPGA and its realization. The easy connection between remote fiber link and computer has been realized, it can be applied in the remote data acquisition and other areas.  
        关键词：USB;optical;firmware;FPGA;driver   
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      • LI Yong~1,ZHONG Cheng~2
        Issue 5, Pages: 47-48(2004) DOI: 10.13756/j.gtxyj.2004.05.016
        摘要：With the increasing level of power line voltage, the high voltage power line is developing very fast. When this power line is active, there is electric field around with them which would cause electro-magnetic interference. The higher the voltage level of the power line is, the worse of the electro-magnetic interference effect is. For the safety of the human being and the equipments, we must pay attention to the electric field caused by the higher voltage level of the power line, especially for the ultra high voltage of the power line. We must analyze the distributing electric field of power line iron tower when ADSS cable spanning with the high voltage power line.  
        关键词：ADSS;super high voltage power line iron tower;ultra high voltage power line;optic fiber communication;power line communication   
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      • ZHAO Yan-ming,QUAN Zi-yi
        Issue 5, Pages: 49-51(2004) DOI: 10.13756/j.gtxyj.2004.05.017
        摘要：In this paper, we propose a new algorithm which performs adaptive denoising twice in wavelet domain. The adaptive thresholds are respectively based on ML and MAP estimates of the variance. Experimental result shows that this algorithm yields higher PSNR compared to other adaptive wavelet denoising algorithms.  
        关键词：wavelet transform;wavelet denoising;wavelet thresholding;image estimation   
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      • LIU Xue-jun,LI Jin-yan,JIANG Zuo-wen,LI Shi-yu,LI Hai-qing
        Issue 5, Pages: 52-54(2004) DOI: 10.13756/j.gtxyj.2004.05.018
        摘要：Using Er3+/Yb3+ co-doped fiber for pumping-amplification when its concentration of Er3+ ion has been increased to 0.5% （wt） and no concentration quenching occurred, we obtained the situation output power of 22.3 dBm.We compared this resualt with the relevant parameters of our Er3+-doped fiber, and made spectral analysis for Er3+-doped fiber and Er3+/Yb3+ co-doped fiber, the result shows that the Er3+/Yb3+ co-doped fiber has obvious advantages when it applied to the amplifier with large capacity and high output power.  
        关键词：Er3+/Yb3+ co-doped fiber;manufacture;spectrum analysis   
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      • LI Zhi-zhong,ZHOU Wei-lin,YANG Hua-yong,LIU Yang,HU Yong-ming
        Issue 5, Pages: 55-57(2004) DOI: 10.13756/j.gtxyj.2004.05.019
        摘要：High frequency vibration sensing with fiber grating is achieved with the method based on unmatched Mach-Zehnder interferometer . The random phase noise and the light source power waving are suppressed through the work point controlling. We achieved the measurement of 40 kHz frequency.  
        关键词：vibration measurement;fiber grating;high frequency sensing   
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      • HU Kai~1,JIANG Qun~2
        Issue 5, Pages: 58-61(2004) DOI: 10.13756/j.gtxyj.2004.05.020
        摘要：The paper introduced the structure characteristics of double cladding fiber firstly. According to the characteristics of cladding-pump technology the authors analyzed the principle and some crucial pump coupling technologies of the cladding-pump technology. At last the authors introduced in detail the present and potential applications of the cladding-pump technology.  
        关键词：double cladding fiber;cladding-pump;cladding-pump fiber laser;cladding-pump fiber amplifier   
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      • LIN Wei-qiang~1,HU Chun-lin~2
        Issue 5, Pages: 62-64(2004) DOI: 10.13756/j.gtxyj.2004.05.021
        摘要：With the development of optical fiber communications, the reliability and security of the optical cable line obtained more and more attentions, and the maintenance of optical cable became very important too. This paper discussed the trouble shooting, attenuation uniformity of optical fiber, optical fiber splicing and PMD problem in the maintenance of optical fiber line.  
        关键词：optical cable line;attenuation uniformity;optical fiber jointing;PMD   
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      • CHANG Jin,HUANG De-xiu
        Issue 5, Pages: 65-67(2004) DOI: 10.13756/j.gtxyj.2004.05.022
        摘要：Using a triple-layer antireflection coating on facets of InGaAsP semiconductor laser chips, the minimum facet reflectivity <10-4 at the center-wavelength of 1 310 nm and the semiconductor optical amplifiers with ASE ripple <0.5 dB are obtained.  
        关键词：semiconductor optical amplifier;antireflection coating;residual reflectivity   
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      • LI Zhi-hong,HE Dui-yan,ZHOU Hui,HE Lei
        Issue 5, Pages: 68-70(2004) DOI: 10.13756/j.gtxyj.2004.05.023
        摘要：The perfectly matched layer boundary condition incorporated into the beam propagation method based on a finite element scheme is introduced in the article.To show the validity and usefulness of this approach ,a linearly tapered optical waveguide with different index contrast and opening angle is analyzed.  
        关键词：beam propagation method;finite element method;perfectly matched layer;wide-angle beam propagation;optical waveguide analysis;linearly tapered waveguide   
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