最新刊期
      卷 ， 期 1 ， 2005
      • XU Jun-bo,YANG Ning,YE Bo,CAO Yun,CHEN De-hua,HE Jian-ming
        Issue 1, Pages: 1-2(2005) DOI: 10.13756/j.gtxyj.2005.01.001
        摘要：Base on the tributary transparent multiplex（TMUX） method,a （40 Gbit/s） optical transport unit（OTU） applied to （40 Gbit/s） dense wavelength division multiplexing （DWDM） optical transmission system is developed and tested. The test data meet the requirements of OTU.  
        关键词：40 Gbit/s DWDM;WDM;optical transport unit（OTU）   
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      • LI Chang-chun,HE Jian-ming,XU Jun-bo
        Issue 1, Pages: 3-5(2005) DOI: 10.13756/j.gtxyj.2005.01.002
        摘要：The foundation of SBS suppression using dither was explicated by the theory of SBS in optical transmission system, an experiment was deployed to study the effect of SBS at different dither frequency and dither modulation amplitude in 10 Gbit/s optical transmission system, the optimized results of dither frequency and dither modulation amplitude were obtained.  
        关键词：optical transmission;dither;dither frequency;dither amplitude;SBS   
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      • JIANG Pei-pei,LIU San-yang
        Issue 1, Pages: 6-8(2005) DOI: 10.13756/j.gtxyj.2005.01.003
        摘要：A QoS routing and wavelength assignment algorithm in WDM networks is proposed. The new algorithm gets the set of nondenominated paths according to the created routing table for each node and considers the two subproblems of routing selection and wavelength assignment simultaneously based on a multi-object programming model. Simulation experiment shows that the algorithm is efficient.  
        关键词：WDM optical networks;routing and wavelength assignment;QoS   
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      • SHAO Cheng-si~1,SUN Jun~2
        Issue 1, Pages: 9-11(2005) DOI: 10.13756/j.gtxyj.2005.01.004
        摘要：This paper represented relationship between ASON and GMPLS and analysed the hierarchical architecture of GMPLS. It also introduced the protocols of signaling, routing and link management based on practical application. Besides these, the implementation of GMPLS for ASON control plane and LSP creation were introduced. Lastly, this paper outlined the applications of ASON and some questions end.  
        关键词：ASON;GMPLS;control plane   
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      • PAN Yong,YE Pei-da
        Issue 1, Pages: 12-14(2005) DOI: 10.13756/j.gtxyj.2005.01.005
        摘要：The traffic characteristics of asynchronous optical packet switching networks are studied, the analytic and approximate models of network traffic are proposed. The study shows that the arrival intervals of optical packets present a negative exponential distribution and the optical packet length tends to have the Gaussian distribution when the time-out based optical packet assembly algorithm is adopted and if the input IP traffic has short-range independence.  
        关键词：traffic characteristics analysis;traffic modeling;asynchronous optical packet switching;optical packet assembly algorithm   
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      • LI Yu,WANG Zhi-gong,WANG Xiao-ming,MIAO Peng
        Issue 1, Pages: 15-17(2005) DOI: 10.13756/j.gtxyj.2005.01.006
        摘要：This paper gave a brief introduction to the very short reach optical transmission system, analysed features of current word alignment circuits, and proposed a novel parallel binary search word alignment circit specifically for SDH systems. The logic function are simulated and verified by using Stratix FPGA EP1S25F780C5 from Altera corporation.  
        关键词：very short reach;word alignment;OC -192;FPGA   
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      • LIU Xiao-hong~1,HE Jian-ming~2
        Issue 1, Pages: 18-19(2005) DOI: 10.13756/j.gtxyj.2005.01.007
        摘要：This paper introduces a testing technology for cross connect module of SDH equipment. It can conduct fast and all-round test for cross connect module. It may judge failure and send signal constantly for conner to maintain when the module is at fault. The article firstly introduces the background and meaning of this research, then the theory of operation for cross connect module. After that, testing technology of cross connection with granularity at VC-12 and VC-4 is illustrated in detail. Practical running and testing proved the design’s feasibility and reliability.  
        关键词：VC-4;VC-12;cross connect;pointer adjustment   
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      • YE Rong-fu,CHEN Jun-qiang
        Issue 1, Pages: 20-21(2005) DOI: 10.13756/j.gtxyj.2005.01.008
        摘要：Network management is more and more important on the applying of CWDM with each passing day. This article introduces the networking of CWDM network management subsystems and enumerates some in-band or out-band transmission channels of management information. In addition, it illustrates an typical example that a central network management system is composed of several CWDM links or rings in converge layer.  
        关键词：CWDM;OSC;in-band;out-band   
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      • LI Xiong~1,CHEN Jian-ming~2
        Issue 1, Pages: 22-25(2005) DOI: 10.13756/j.gtxyj.2005.01.009
        摘要：The paper described the normal technologies used in the metro optical network construction, then analysed the advantages and the shortages of these technologies. The development in the future and the application of CWDM were also described in this article.  
        关键词：CWDM;DWDM;SDH;MSTP   
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      • QI Shi-jie,ZOU Jun-ni,LI Ying-chun,LIN Ru-jian
        Issue 1, Pages: 26-29(2005) DOI: 10.13756/j.gtxyj.2005.01.010
        摘要：In this study, we presented a novel scheduling scheme—hierarchical weighted bandwidth guaranteed （HWBG） scheme, which could support multiple services. The simulation results by OPNET verified the validity of this scheme.  
        关键词：EPON;QoS;weight;service level agreement （SLA）;multi-point control protocol （MPCP）   
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      • XU Wen-long,Lü Jian-xin
        Issue 1, Pages: 30-32(2005) DOI: 10.13756/j.gtxyj.2005.01.011
        摘要：This article discussed the relation of chromatic dispersion tolerate, Q value and BER of the 40 Gbit/s optical communication system, and put forward a tunable dispersion compensation technique based on BER feedback.  
        关键词：bit error rate（BER）;chromatic dispersion;fiber Bragg grating   
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      • FENG Bo,XIAO Ding-zhong
        Issue 1, Pages: 33-35(2005) DOI: 10.13756/j.gtxyj.2005.01.012
        摘要：In the design of EOS, the MAC frames received by Ethernet are stored firstly and then removed by eneapsulation engine. This paper describes the realization process in which the SDRAM is used as and off-chip memory.Utilizing the features of SDRAM, especially its advantages of high-speed and large capacity, the buffer area on ASIC chip can be certainly reduced and the Ethernet data can be accurately mapped into the SDH transport network. The design has been verified on FPGA and passed the IP network analyzer test.  
        关键词：SDRAM;SDH;buffer;encapsulation engine;precharge;refresh   
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      • ZHOU Xiu-li,HU yu,TAN Qing-gui
        Issue 1, Pages: 36-39(2005) DOI: 10.13756/j.gtxyj.2005.01.013
        摘要：Based on the construction theory of optical orthogonal hopping codes, using the modified prime code as time spreading codes and the optical orthogonal codes as frequency hopping codes, we constructed the two dimensions MPC/OOC combination codes for the OCDMA system. This encoding scheme has large code’s capacity compared with the two dimensional codes. Through grouping, the MPC/OOC code can obtain good performance of auto-correlation and cross-correlation with still quite large codes capacity.  
        关键词：OCDMA technology;OOC;modified prime code;MPC/OOC combined codes   
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      • GAO Yan-dong~1,LIU Zhao-lun~
        Issue 1, Pages: 40-42(2005) DOI: 10.13756/j.gtxyj.2005.01.014
        摘要：This paper firstly gave an introduction to the physical origin of the unusual dispersion properties of photonic crystal fibers （PCF） and related theoretical research methods, then emphatically educidated the three dispersion properties of PCF that are related to optical fiber communication applications: zero-dispersion at short wavelength, nearly zero ultra-flattened dispersion, and highly negative dispersion that can effectively compensate the positive dispersion of standard single mode fiber.  
        关键词：photonic crystal fiber（PCF）;zero-dispersion;ultra-flattened disperion;dispersion compensation   
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      • GUI Hou-yi~1,HU Jia-ni~2
        Issue 1, Pages: 43-46(2005) DOI: 10.13756/j.gtxyj.2005.01.015
        摘要：This paper reviews the structure, the light guiding principle and charactenistics of some kinds of photonic crystal fibers （PCF）, and describes more comprehensively the application prospects of PCF in optical fiber communication.  
        关键词：photonic crystal;optical fiber communication;structure;light guiding   
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      • LI Jin-yan,LI Shi-yu,LI Hai-qing,CHEN Wei,LIU Xue-jun,JIANG Zuo-wen
        Issue 1, Pages: 47-50(2005) DOI: 10.13756/j.gtxyj.2005.01.016
        摘要：Recently ytterbium-doped fiber laser has been widely developed. DCYDF （Double-Cladding Ytterbium Doped Fiber）was designed to meet rising demand for high-power laser. Fiber core of DCYDF is designed as signal waveguide, and inner-cladding is designed as pump waveguide. MOFs （Microstructure Optical Fibers） are single material optical fibers with a periodic array of air holes running along the entire fiber length where the guiding region is realized by breaking the lattice periodicity with a central defect. In particular the possibility of having very small or very large mode areas has been exploited to realize new fiber lasers or fiber amplifiers with higher gain than in conventional single-mode doped fibers. In this paper, microstructure D-shape and hexagon inner cladding ytterbium doped fiber was designed and fabricated based on requirements of high power fiber laser.  
        关键词：MOF;DCYDF;fiber laser;inner-cladding   
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      • WANG Min-qi
        Issue 1, Pages: 51-53(2005) DOI: 10.13756/j.gtxyj.2005.01.017
        摘要：This paper mainly discussed the technology of the polarity detection of PMF, put forward some questions that we should pay attention to during the detection, and presented the way to solve them.  
        关键词：polarization maintaining optical fiber;polarity;test of polarity   
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      • XIE You,WANG Ya-min
        Issue 1, Pages: 54-56(2005) DOI: 10.13756/j.gtxyj.2005.01.018
        摘要：This paper presented the numerical simulation of the effect of third-order dispersion（TOD） and four-order dispersion（FOD） on femtosecond optical pulse propagation properties in fiber optic communication. The results show that both the TOD and FOD can affect the communication quality: the pulse width will be expanded and the pulse will drift backwards and ahead by the positive and negative TOD respectively, the pulse width will be expanded and the side spectra will be caused by FOD.  
        关键词：high-order dispersion;femtosecond optical pulse;numerical simulation   
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      • GUO Lin,WANG Wen-jie,ZHANG Ning,JI Yue-feng
        Issue 1, Pages: 57-60(2005) DOI: 10.13756/j.gtxyj.2005.01.019
        摘要：We introduced the basic characteristics of a novel material called photonic crystal at the beginning of this paper. Then we discussed the applications of photonic crystal components in optical communication system.  
        关键词：photonic crystal;optical component;optical communication   
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      • DAI Feng,ZHANG Xiao-guang,YANG Bo-jun
        Issue 1, Pages: 61-63(2005) DOI: 10.13756/j.gtxyj.2005.01.020
        摘要：A new compressor that combines comb-like fiber chain and phase-sensitive amplifiers is proposed in this paper. Theory analysis finds that the application of phase-sensitive amplifiers in comb-like compressor can compensate pulse broadening induced by group-velocity dispersion （GVD） and self-phase modulation （SPM）. This kind of compressor can provide a better quality of pulse compression than the comb-like compressor does.  
        关键词：pulse compression;phase-sensitive amplifier;comb-like dispersion fiber chain   
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      • SU Shan-xing~
        Issue 1, Pages: 64-67(2005) DOI: 10.13756/j.gtxyj.2005.01.021
        摘要：Polarization dependent loss（PDL） of fused taper wide band coupler（FWBC） have been studied and found that it is asymmetry of the two taper fibers making up the coupler that has caused the PDL. By optimizing structure of coupler, the lowest PDL of FWBC ever reported has been achieved: PDL≤ 0.05 dB @1 310 nm & PDL≤ 0.07 dB @1 550 nm.  
        关键词：fused taper wide band coupler;polarization dependent loss;pre-pull   
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      • YANG Ming-di~
        Issue 1, Pages: 68-70(2005) DOI: 10.13756/j.gtxyj.2005.01.022
        摘要：A novel technique of tunable polarization mode dispersion （PMD） compensation based on fiber Bragg grating （FBG） is proposed. In this method, tunable linear chirp is introduced to a uniform fiber grating by magnetic field, while the central wavelength does not change. This all-fiber PMD compensation technique is cost-effective and flexible in achieving differential group delay （DGD）. The result of numerical simulation on a 10 Gbit/s NRZ transmission system demonstrates a significant improvement in the eye pattern by employing the PMD compensator.  
        关键词：optical fiber communication;polarization mode dispersion（PMD）;chirped fiber grating   
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