最新刊期
      卷 ， 期 5 ， 2009
      • Gan Baobao,Xu Rongqing,Jiang Hongliang,Sun Xiaoyin
        Issue 5, Pages: 1-3(2009) DOI: 10.13756/j.gtxyj.2009.05.003
        摘要：As the previous heuristic P-cycle capacity assignment algorithms are inefficient in resource utilization and ill-balanced in capacity assignment,this paper presents a novel heuristic algorithm,which first constructs a set of optional cycles in line with the network topology and the unprotected working capacity,then chooses the P-cycle with the maximum protection efficiency to be assigned to the network.A distinguished feature of this algorithm is to take the unprotected working capacity as one of the key factors for the construction of the optional cycles.The simulation results show that the new heuristic algorithm brings about better resource utilization and more balanced resource capacity assignment than the previous ones.  
        关键词：optical network;protection;survivability;preconfiguration cycle   
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      • Liu Yu,Sun Yani,Fang Lijie,Li Shijie
        Issue 5, Pages: 4-7(2009) DOI: 10.13756/j.gtxyj.2009.05.004
        摘要：In this paper,a novel analytical method for numerical calculations is presented,by which the numerical solution to the output signal power in DWDM optical communication systems on the coupling condition of attenuation,dispersion walk-off and Stimulated Raman Scattering（SRS） effects is obtained.Then numerical simulation is performed by using MATLAB.Finally,on the basis of numerical calculations,a diagram showing the SRS effects on the optical communication system performances in short-range transmissions on the condition of different output optical power and channel numbers is drawn.  
        关键词：DWDM;SRS;dispersion walk-off;coupling equation;numerical solution   
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      • Zhang Xia1,Wang Fang1,Zhang Min1,Niu Huijuan1,Xu Hengying1,Bai Chenglin1,Zhang Xiaoguang3
        Issue 5, Pages: 8-9(2009) DOI: 10.13756/j.gtxyj.2009.05.005
        摘要：This article theoretically derives the formulas for the principles of Carrier-Suppressed Return-to-Zero（CSRZ） and Differential Quadrature Phase Shift Keying（DQPSK） modem,presents the specific processes of their implementation and obtains by simulation their spectra after modulation and eye diagrams after demodulation.The results show that CSRZ-DQPSK,as a new multi-level phase modulation format,has narrower spectrum width and higher spectrum efficiency,and good eye diagram performance after demodulation,expected to become the first choice of the transmission code for the next generation fiber-optic communication system.  
        关键词：fiber-optic communication technology;CSRZ;DQPSK;multi-level phase modulation   
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      • Zhu Zhiying,Xu Ming,Luo Jun,Ji Jianhua
        Issue 5, Pages: 10-13(2009) DOI: 10.13756/j.gtxyj.2009.05.006
        摘要：For the suppression of optical pulse phase jittering induced by Kerr nonlinear effects including SPM and XPM in the 40 Gbit/s RZ-DPSK-based DWDM system,four dispersion management schemes are presented,i.e.pre-compensation,post-compensation,intermediate compensation and balance compensation,and their advantages and disadvantages in terms of the suppression analyzed.On the basis of appropriate scheme selections,2 dB performance improvement in average is achieved in the suppression of SPM and XPM effects in RZ-DPSK systems.  
        关键词：dispersion management;DPSK;SPM;XPM   
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      • Deng Zhuanhua1,Li Wei2
        Issue 5, Pages: 14-16(2009) DOI: 10.13756/j.gtxyj.2009.05.007
        摘要：This paper proposes a novel signaling set-up and protocol scheme for optical links that is based on a mobile agent and Optical Burst Switching（OBS） network,in which the active packet structure is used in the mobile agent to epitomize the signaling information and data flow in a BHP so as to reduce the time for the set-up of an optical circuit.In this scheme,distributed processing links can be realized to reduce the workload of a node in the network and enhance its parallel operational capability.  
        关键词：OBS network;signaling protocols;mobile agent;distributive call and connection management   
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      • Fu Yuan,Lü Jianxin
        Issue 5, Pages: 17-19(2009) DOI: 10.13756/j.gtxyj.2009.05.008
        摘要：In high-rate data transfer networks,User Datagram Protocol（UDP） has incomparable advantages over any other data transfer protocols,but it also has the problem of poor reliability in the transfer.On the basis of analyzing in detail the characteristics of UDP,this paper improves its key technologies and designs a reliable transfer mechanism.Finally,it offers a specific method and procedure for the realization of the reliable UDP transmission by VxWorks.  
        关键词：UDP;transmission reliability;retransmission mechanism;confirmation mechanism   
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      • Niu Huijuan1,Bai Chenglin1,Wei Liqin3,Xu Hengying1,Zhang Xia1
        Issue 5, Pages: 20-23(2009) DOI: 10.13756/j.gtxyj.2009.05.016
        摘要：In this paper,the statistical properties of the 1st-order PMD,the 2nd-order paralleled and vertical components and the 2nd-order PMD resultant vector of the "Polarization Controller（PC） + Polarization-Maintaining Fiber" model simulator are studied by using the Jones Transmission Matrix method.The more the number of simulators are used,the closer the statistical properties of their 1st-and 2nd-order PMD to the theoretical curves.In consideration of the comprehensive factors,it is found that the "3PC+3PMF" model is most suitable for lab simulation of the 1st-and 2nd-order PMD properties.This conclusion provides a good basis for the PMD compensation in next step.  
        关键词：PMD;PC;PMF;Jones Transmission Matrix   
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      • Li Jibi,Zhang Zhizhong,Huang Shiguang
        Issue 5, Pages: 24-26(2009) DOI: 10.13756/j.gtxyj.2009.05.015
        摘要：This paper gives a detailed description of the traffic data calculation procedure from the FPGA perspective.The main approach is to convert the source and destination addresses to mapped ones.Then the traffic data information is marked by a matrix.Finally,the statistical information of the local nodes is stored.Simulations indicate that the FPGA implementation approach for Resilient-Packet-Ring（RPR）-based traffic flow statistics proposed in this paper is an efficient way to compute the traffic flow through the downstream blocking and non-blocking nodes.It is of great significance in project applications.  
        关键词：RPR;fair algorithm;FPGA   
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      • Liu Hankui,Tian Xiaoxing,Yuan Fulai
        Issue 5, Pages: 27-29(2009) DOI: 10.13756/j.gtxyj.2009.05.014
        摘要：Using the Multiple Important Sampling（MIS） technique,the performances of 10 Gbit/s optical communication systems affected jointly by Polarization-Mode Dispersion（PMD） and Polarization Dependent Loss（PDL） are simulated under different initial pulse chirps and duty cycles.The power penalty distribution and system outage probability of the system modulated by On-Off Keying（OOK） and Differential Phase Shift Keying（DPSK） are given when PMD=10 ps and PDL=1 and 1.5 dB.It is found that the system performance obviously varies under different duty cycles and the introduction of proper initial chirps,e.g.C=0.5,is conducive to the enhancement of the system performance.  
        关键词：optical fiber communication;PMD;PDL;MIS;outage probability   
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      • Zhu Lijuan
        Issue 5, Pages: 30-32(2009) DOI: 10.13756/j.gtxyj.2009.05.013
        摘要：Self-Phase Modulation（SPM） in optical fibers tends to result in the spectral broadening of optical pulses.In this paper,SPM effect is simulated in Optisystem by adjusting the parameters of fibers and optical pulses,the influences of such parameters as fiber length,peak power,pulse shape and initial chirps on SPM spectrum are analyzed in detail and a phenomenon of spectral narrowing at the fiber output end caused by the negative initial chirp is observed.  
        关键词：SPM;spectral broadening;Gaussian pulse;super-Gaussian pulse;chirp   
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      • Zhang Shuguang,Ye Yunfeng,Li Xiaodong,Zhao Jijun
        Issue 5, Pages: 33-36(2009) DOI: 10.13756/j.gtxyj.2009.05.012
        摘要：On the basis of the study on the Routing and Wavelength Assignment（RWA） algorithm for wavelength routing optical networks,this paper introduces the common methods for the solutions to the routing and wavelength assignment sub-problems,and summarizes the three types of optimization solutions to the routing and wavelength assignment problems.Finally,it analyzes the problems in the existing RWA algorithm design and explains significance of solving such problems.  
        关键词：WDM;wavelength routing optical network;RWA   
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      • Liang Mantang1,Cao Wenhua2,Zhou Jiaqing1
        Issue 5, Pages: 37-39(2009) DOI: 10.13756/j.gtxyj.2009.05.011
        摘要：Numerical simulation indicates that a Mach-Zehnder Interferometer（MZI） constructed from the Dispersion-Decreasing Fiber（DDF） can not only compress higher-order soliton,but also effectively suppress the pedestal after pulse compression.Studies indicate that high-quality pulses can be obtained by flexible adjustment of the two arms of the interferometer and the power split ratio range of the coupler that enable the interferometer to have good compression property is obtained,which has a certain guiding significance to the choice of the parameters in experiments.It is also found in the studies that high quality pulses can still be generated even when fairly large input-to-output dispersion ratio is chosen.  
        关键词：DDF;MZI;optical pulse   
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      • Zhang Chuanhao1,Liu Deming1,Wu Guangsheng1
        Issue 5, Pages: 40-44(2009) DOI: 10.13756/j.gtxyj.2009.05.010
        摘要：EPON is very suitable for broadcasting and multicasting services,such as IPTV,thanks to its tree-shaped topological structure and up to 1Gbps bandwidth.This paper focuses on the technological feasibility of offering multicasting services over EPON and makes improvement over the existing scheme by introducing multicasting source control and user authority control from considerations of system security and maintainability,thus improving the efficiency and precision of multicasting control.At the same time,it gives an extended OAM protocol design scheme and presents the control strategies for dynamic and static assignment in accordance with different control patterns,which is verified in experiments.  
        关键词：Ehernet;PON;IGMP;controllable multicast   
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      • Wu Jie,Wu Jun,Xu Yanfen
        Issue 5, Pages: 45-47(2009) DOI: 10.13756/j.gtxyj.2009.05.009
        摘要：On the basis of the Bandwidth on Demand（BoD） technology for EPON access and in conjunction with the LLID technology and the bandwidth management function of the network management system,this paper presents a bandwidth template mechanism and realizes BoD driven by a template time schedule by developing an EPON bandwidth management system.It gives a detailed explanation of the overall architecture design and function implementation of the system.The test results verify the system design objective.  
        关键词：NMS;EPON;bandwidth management;BoD   
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      • Wu Qing,Gong Fangping,Ji Jianhua
        Issue 5, Pages: 48-50(2009) DOI: 10.13756/j.gtxyj.2009.05.020
        摘要：The effects of pulse shape on the chip-asynchronous coherent time-spreading OCDMA system performances are analyzed by the aperiodic cross-correlation function of up-sampled sequence.Under Gaussian waveform assumption,Multiple-Access Interference（MAI） and Beat Noise（BN） of OCDMA are quantitatively evaluated.For 127-chip Gold sequence,the mean BER performance of the system is derived.The results show that the narrower the optical pulse,the better aperiodic cross-correlation properties of the code words will be obtained,thus reducing MAI and BN and improving BER performance.  
        关键词：optical communication;OCDMA;MAI;BN;aperiodic cross-correlation function   
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      • Li Zhonghui,Ma Xinsheng,Wu Qiufang
        Issue 5, Pages: 51-54(2009) DOI: 10.13756/j.gtxyj.2009.05.019
        摘要：With the development of telecommunication technologies,still higher requirements are raised on network bandwidth for video and image transmission.As the installation and handling costs of the Plastic Optical Fiber（POF） are reduced due to its fairly large core diameters,thus it is considered as the optimum medium for the "last 1 km" in data communications.The purity of PMMA resin is the key factor affecting the fiber loss.On the basis of bulk polymerization technology for its preparation,this paper studies the effects of the volatile content in the resin on the POF transmission loss.  
        关键词：POF;transmission loss;bulk polymerization   
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      • Zhang Ningbo1,Cao Maoyong1,Li Lijun1,Zhang Yanyan1,Qiao Qiuxiao1,Gao Chao1
        Issue 5, Pages: 55-56(2009) DOI: 10.13756/j.gtxyj.2009.05.018
        摘要：Thanks to its advantages of large core diameter,good flexibility,convenient connection and high coupling efficiency,the Plastic Optical Fiber（POF） provides excellent solutions for FTTH access.On the basis of simulation of the fiber coupling efficiency in the POF connector by using MATLAB,this paper presents the structure of a practical plastic fiber connector for FTTH,which is characteristic of low connecting loss,simple operation,convenient installation and high cost performance.  
        关键词：POF connector;simulation;FTTH   
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      • Zeng Zhaoli1,Xiao Lifeng2,Qu Xuemin1,Long Kaiping1,Wen Jun1,Zhang Xiaojun1,Liu Yuansheng1
        Issue 5, Pages: 57-59(2009) DOI: 10.13756/j.gtxyj.2009.05.017
        摘要：In this paper,the filtering characteristics of the Optical Channel Monitor（OCM） based on the Integrated Optics Acousto-optic Tunable Filer（IAOTF） are introduced,the relevant tests for verification performed and reasons for the growth of its asymmetric sidelobes and the resulted crosstalk analyzed.It is found that the sidelobes are resulted from the nonuniform distribution of the waveguide birefringence rate from the device center towards both ends and the level of the OCM crosstalk is dependent not only upon the position but also the intensity of the sidelobes.However,the sidelobes can be effectively compressed and the crosstalk greatly reduced by using a quasi-linear cascaded structure.  
        关键词：OCM;sidelobe;IAOTF;crosstalk   
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      • Li Songbai1,Deng Tao2,Wu Jiagui2
        Issue 5, Pages: 60-62(2009) DOI: 10.13756/j.gtxyj.2009.05.001
        摘要：On the basis of the coupled mode theory,this paper numerically analyzes the effects of refractive index modulation on Fibre Bragg Grating（FBG） characteristics by using the transfer matrix method.The results show that,with the deepening of the refractive index modulation,the peak wavelength of the reflection spectrum is blue-shifted and the peak top becomes flattened,the minimum value of the grating delay occurs at the Bragg wavelength,the peak refractive rate increases and the Full Width Half Maximum（FWHM） of the peak varies linearly.  
        关键词：FBG;transfer matrix;refractive index modulation   
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      • Wu Yaode,Li Jijun,Song Mingyu,Chen Haiyan
        Issue 5, Pages: 63-66(2009) DOI: 10.13756/j.gtxyj.2009.05.002
        摘要：This paper studies the beat frequency characteristics of photonic crystal waveguide directional couplers of the two parallel straight waveguides by using the coupled-mode theory and acquires the analytical expressions for the light intensity distributions in the waveguides when two incident single-frequency waves with similar frequency into the input ports of the two waveguides and calculates the mode field distribution of the coupled waveguides by applying the time-difference time-domain method.The results show that the beat frequency envelope of the incident wave can be detected in the two parallel waveguides by the coupling action of the waveguides and its time-domain characteristics conform to the theoretical analysis.Finally,it presents a frequency transition device for the lightwave to millimeter wave transition by using photonic crystal directional coupled waveguides.  
        关键词：photonic crystal;waveguide coupler;beat frequency;frequency transition;millimeter wave   
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      • Zhou Zhengxian1,Xiao Shilin1,Tong Fangxuan2
        Issue 5, Pages: 67-70(2009) DOI: 10.13756/j.gtxyj.2009.05.021
        摘要：On the basis of the M-Z（Mach-Zehnder） interference principle,this paper presents a novel fiber-optic vibration sensor scheme,which can determine the location of vibration events.It simulates and analyzes the signal processing technology for the sensor,achieves fairly good locating performance by increasing signal bandwidth,extending signal duration and improving the SNR and the locating algorithm,and verifies the feasibility of the scheme.  
        关键词：optical fiber vibration sensor;locating;M-Z interference;delay   
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