最新刊期
      卷 ， 期 3 ， 2003
      • AO Fa-liang,HU Han wu
        Issue 3, Pages: 1-3(2003) DOI: 10.13756/j.gtxyj.2003.03.001
        摘要：This paper puts forward a heuristic algorithm of routing and wavelength assignment （RWA）, which unifies the routing and wavelength assignment subproblems.Through a new layer graph （LG） algorithm and limitative coefficient k,the routing and wavelength assignment of all optical networks can be optimized, so the wavelength number required for setting up optical connects can be minimized. Finally the performance was studied for five realistic optical networks, including the ARPANet.It proves that this LG algorithm performs better than the existing ones.  
        关键词：routing and wavelength assignment;layer graph;WDM;all optical network   
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      • LUN Xiu jun 1,2,HUANG Yong qing 1,ZHANG Rui kang 1
        Issue 3, Pages: 4-7(2003) DOI: 10.13756/j.gtxyj.2003.03.002
        摘要：All optical 3R regeneration （Re amplification, Re shaping,Re timing） is a key technique needed for the future ultrahigh speed and large capacity optical networks. In this paper we have explained in detail the principle and techniques of all optical 3R regeneration, and on basis of it we propose a novel system of all optical 3R regeneration.  
        关键词：all optical regeneration;clock recovery;optical decision gate   
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      • LIU Guo hui 1,YUAN Yan 2
        Issue 3, Pages: 8-11(2003) DOI: 10.13756/j.gtxyj.2003.03.003
        摘要：The paper introduces the mapping and mulplexing structure of OTM,ODUk mulplexing and mapping methods of client signals in OTN.  
        关键词：OTN;OTM;mapping;mulplexing   
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      • MAO Jian zhuang 1,LIU Guo hui 2
        Issue 3, Pages: 12-15(2003) DOI: 10.13756/j.gtxyj.2003.03.004
        摘要：The paper introduces the virtual concatenation technology of optical transport network ,including container and overhead of virtual concatenation, the method of mapping client signals into virtual container.  
        关键词：OTN;virtual concatenation;mapping   
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      • LI Xin xin 1,LI Wen yao 2
        Issue 3, Pages: 16-19(2003) DOI: 10.13756/j.gtxyj.2003.03.005
        摘要：From the point of view of the control plane,this paper makes a detailed discussion about ASTN/ASON LN CP architecture,and interactions between client LN CP and server LN CP ,after that,it also gives a introduction to the connection types of the ASTN/ASON layer networks with switching capabilities.  
        关键词：ASTN/ASON;control plane;layer network   
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      • WEI Yi mei,LU Lin,WANG Rong
        Issue 3, Pages: 20-24(2003) DOI: 10.13756/j.gtxyj.2003.03.006
        摘要：Ethernet passive optical network （EPON） is considered the best solution for the “first mile problem ”. The topology and protocol structure of EPON are discussed first based on the IEEE802.3ah draft. The point at issue and key technologies of the physical layer,data link layer and QoS of EPON are discussed respectively in this paper.  
        关键词：EPON;MPCP;QoS   
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      • XIN Yu,YU Chong xiu,WU Qiang,ZHENG Wen xiao,LIU Gang
        Issue 3, Pages: 25-28(2003) DOI: 10.13756/j.gtxyj.2003.03.007
        摘要：Taking the EQC code as a example, this paper describes the characteristic of two dimensional “different chip and different wavelength” codeword structure. The en /de coding technology by fiber grating for this codeword structure and the relevant traits are analyzed. Finally the star topology for this OCDMA system is described.  
        关键词：OCDMA;EQC code;Bragg fiber grating;multiple bit rate encoding   
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      • Issue 3, Pages: 28(2003)
          
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      • YU Lin sheng 1,DONG Sheng 1,TANG Si ning 2,YIN Xin da 3
        Issue 3, Pages: 29-31(2003) DOI: 10.13756/j.gtxyj.2003.03.008
        摘要：This paper mainly presented the application of Raman fiber amplifier （RFA） in long span SDH line and the problems required to consider and solve in product design, investigated the realization scheme and test results of ultralong span SDH optical transmission system. In addition, we discussed the problems need to be noted in practical application of RFA, and for the first time, gave the field application results of RFA in domestic 2.5 Gbit/s system over 200 km G.652 fiber. These results have positive referential value for the deployment of RFA.  
        关键词：RFA;long span optical transmission;engineering application   
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      • WANG Kun,ZHANG De kun
        Issue 3, Pages: 32-34(2003) DOI: 10.13756/j.gtxyj.2003.03.009
        摘要：In this paper,we present a light filtering scheme based on fiber Bragg grating（FBG） for submarine optical communication system. The transmission characteristics of FBG are analyzed in coupled mode theory,and the uniform periodic Gauss apodized FBG with Bragg wavelength of 532 nm, narrow reflection bandwidth and high reflectivity is simulated numerically.  
        关键词：FBG;coupled mode theory;submarine optical communication;apodization   
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      • LI Bin,LI Shi yu
        Issue 3, Pages: 35-37(2003) DOI: 10.13756/j.gtxyj.2003.03.010
        摘要：In this paper, the current status in manufacturing technologies of optical fiber preform were described, hybrid process technologies of “PCVD+OVD” were analyzed in details.  
        关键词：optical fiber;preform;OVD;PCVD   
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      • WU Jin dong,PENG Ming hua,DUAN Lin feng,SUN Ke yuan,PAN Zhi yong,SONG Shen yuan,LIU Wan tong,QI Guo xiang
        Issue 3, Pages: 38-40(2003) DOI: 10.13756/j.gtxyj.2003.03.011
        摘要：This article introduces a method and equipment of ACVD process for producing optical fiber preform, analyses the characteristics and the influencing factors of the process.  
        关键词：optical fiber preform;ACVD;over cladding process   
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      • PENG Ning,KE Chang jian,LIU De ming
        Issue 3, Pages: 41-42(2003) DOI: 10.13756/j.gtxyj.2003.03.012
        摘要：In this paper,the principle of fixed analyzer method for optical fiber polarization mode dispersion（PMD） testing was discussed. We also introduced a kind of automatic measurement apparatus for PMD in fiber which based on fixed analyzer method. The measurement results of this instrument were given.  
        关键词：PMD;fixed analyzer method;measurement   
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      • LIU Cheng 1,LI Yong 2
        Issue 3, Pages: 43-46(2003) DOI: 10.13756/j.gtxyj.2003.03.013
        摘要：This paper analyzes the performance fectures, current status and technical development trends of MZ modulator and EA modulator applicable to high speed optical transmission systems up to 40 Gbit/s.  
        关键词：MZ modulator;EA modulator;optical transmission   
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      • LIU Wei,SUN Jun qiang,ZHANG Xin liang,HUANG De xiu
        Issue 3, Pages: 47-50(2003) DOI: 10.13756/j.gtxyj.2003.03.014
        摘要：In this paper we demonstrated a novel all optical wavelength conversion（AOWC） technique which employs the cascaded second order nonlinearity in passive optical waveguides. Using a 50 mm periodically poled LiNbO\-3 waveguide, we realized over 70 nm conversion bandwidth at 1.55 μm band and demonstrated the ability of multiply wavelength channels simultaneous conversion.  
        关键词：AOWC;second order nonlinearity effect;WDM   
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      • MA Hui lian
        Issue 3, Pages: 51-55(2003) DOI: 10.13756/j.gtxyj.2003.03.015
        摘要：This paper presents recent advances in manufacture technologies of optical switch, which include micro optical electro mechanical system （MOEMS）, bubbles, liquid crystals, holograms, thermo optics and acoustic optics. Different features and recent and future progress of various switching technologies are discussed.  
        关键词：optical switch;integrated optics;optical communication   
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      • WAN Li 1,WU Ya ming 2,WANG Yue lin 1
        Issue 3, Pages: 56-59(2003) DOI: 10.13756/j.gtxyj.2003.03.016
        摘要：Arrayed waveguide grating（AWG） is an important device for DWDM optical network.The insertion loss is one of its important characteristic parameters. Based on the generalization of many solutions to improve this characteristic parameter we analyze how to use the tapered waveguides to reduce the coupling loss caused by the field mismatch. The proposed method can considerably lower the insertion loss of AWG without increasing difficulties of device processing. The design criteria can be easily applied to AWG of various materials and structures.  
        关键词：DWDM;AWG;insertion loss;tapered waveguide   
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      • JIANG Hong 1,WANG Wen min 2,CHEN Guang 2
        Issue 3, Pages: 60-62(2003) DOI: 10.13756/j.gtxyj.2003.03.017
        摘要：The Y branch is the fundamental structure in the planar lightwave circuit, and the property of its output is analyzed in this paper. The symmetry of Y branch’s output is optimized by optimizing the length of the tapered waveguide in Y branch and by inserting a straight waveguide with proper length between the tapered waveguide and the input waveguide.  
        关键词：Y branch;symmetrical output;planar lightwave circuit   
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