最新刊期
      卷 ， 期 2 ， 2004
      • ZENG Hui,YANG Zhu
        Issue 2, Pages: 1-3(2004) DOI: 10.13756/j.gtxyj.2004.02.001
        摘要：This paper introduces the production mechanism of carrier-suppressed return-to-zero（CS-RZ） format and its good transmission performance, and also compares the transmission performance of CS-RZ with RZ and NRZ formats at 40 Gbit/s system through computer simulation. CS-RZ format is more effective than other formats in terms of against SPM, and it has high dispersion tolerance. It is actually the best format in terms of tolerance of dispersion and SPM.  
        关键词：CS-RZ;non-linearity;dispersion tolerance;eye-openig penalty（EOP）;power penalty   
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      • XU Ming,PU Tao,YANG Shu-wen,MA Jun-xian
        Issue 2, Pages: 4-7(2004) DOI: 10.13756/j.gtxyj.2004.02.002
        摘要：The typical systems of optical code-division-multiple-access （OCDMA） in local area network（LAN） and metropolitan area network（MAN） are given, and based on these systems, the split-step fast Fourier transformed（SSFFT） method is used to analyse the transmission performance of picsecond OCDMA systems and the decoding output. The results have shown that these systems have a good decode capability, and can be given for reference in design of the valuable practical OCDMA systems.  
        关键词：OCDMA;optical orthogonal code;LAN;MAN;SSFFT method   
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      • LI Yong~1,NIU Hai-ming~2
        Issue 2, Pages: 8-10(2004) DOI: 10.13756/j.gtxyj.2004.02.003
        摘要：FTTH is the last trends of optical access technology. With the support of the government, the challenge of the operators, and the drop of the devices cost. FTTH is developing very fast . in this paper ,the new development and latest trend is provided, and the main FTTH solutions, such as point to point Ethernet, EPON, GPON etc, have been analysed. The trend of FTTH is predicted by the author.  
        关键词：optical telecommunication;FTTH;broadband access;OAN   
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      • Issue 2, Pages: 11-13(2004) DOI: 10.13756/j.gtxyj.2004.02.004
        摘要：Now the theory network model such as Manhattan street network and shuffle net could not meet the requirements of optical packet switch network. In this paper,we propose a new network model-self-similar circumfluent network.We introduce many propertys of this network model.  
        关键词：self-similarity;circumfluent;optical packet switch   
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      • XUE Wen-ge,CHEN li
        Issue 2, Pages: 14-17(2004) DOI: 10.13756/j.gtxyj.2004.02.005
        摘要：Survivability is an unsolved issue in optical transport networks. This paper present the ring cover protection strategy based on excellent protection-conversion capability of token ring network, and bring forward control flow to select ring cover. This paper also set up a ring cover optimized design model with the optimized object of requirement of protection capacity.  
        关键词：survivability;ring cover;ILP;mesh network   
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      • GAO Fei~1,ZHAO Yi~2,WANG Jie~1,WANG Jin-rong~3
        Issue 2, Pages: 18-22(2004) DOI: 10.13756/j.gtxyj.2004.02.006
        摘要：The characteristics of HFC bi-direction interaction access networks and the principle of DOCSIS, developed by MCNS were described in this paper. A subscriber identification scheme based on CM model and twi-step IP distributing was proposed by authors. Also, we analyzed the operating flow and technical advantage of this scheme.  
        关键词：subscriber identification;IP distributing;HFC access network   
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      • WU Jian-xue
        Issue 2, Pages: 23-26(2004) DOI: 10.13756/j.gtxyj.2004.02.007
        摘要：Survivability is an important research subject of optical transport network（OTN）. This article introduces the bytes used for fault monitoring and protect switching in the frame structure of digital wrapper. As an example, this article analyzes the convection mechanism of APS signaling when near-side & far-side switch occurs in the OTN ring protection based on ODUk.  
        关键词：OTN;digital wrapper;automatic protection switching（APS）;near-side switch;far-side switch   
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      • MIAO Peng,WANG Zhi-gong,WANG Xiao-ming,LIU Yong-wang,WANG Jing-bo
        Issue 2, Pages: 27-30(2004) DOI: 10.13756/j.gtxyj.2004.02.008
        摘要：Very short reach VSR4-01.0 optical transmission system are briefly introduced. Data transmission correctness is guaranteed by means of the implementation of protection channel and error detect channel designed by Verilog HDL. The logic functions are simulated and verified by using FPGA Mercury EP1M350F780C5 from Altera corporation.  
        关键词：very short reach;CRC;error detect   
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      • Issue 2, Pages: 31-33(2004) DOI: 10.13756/j.gtxyj.2004.02.009
        摘要：One of the key technologies of EPON is the realization of transmission convergence, including the synchronization of burst, ranging, allocation of bandwidth, frame synchronization, control of BER （Bit Error Rate）, OAM （Operations, Administration and Maintenance） and so on. The design of two special chips for EPON is put forward. One is for OLT, and the other is for ONU. The designed chips achieve the main functions of transmission convergence of EPON. System performance, such as traffic delay, is simulated by using OPNET.  
        关键词：EPON;OLT;ONU   
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      • RUAN Lin-bo,ZHANG Zhong-bing
        Issue 2, Pages: 34-35(2004) DOI: 10.13756/j.gtxyj.2004.02.010
        摘要：In this prper, we introduce a new laser module which can transmit and receive data in the single fiber. The whole module has maxim transmission rate of 650 Mbit/s and transmission distance of 15 km. In additional, we present in detailed the design process and experiment results of whole module.  
        关键词：bidirecional transmission;optical transmitting;optical receiving   
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      • YUE Ai-wen~
        Issue 2, Pages: 36-38(2004) DOI: 10.13756/j.gtxyj.2004.02.011
        摘要：The 850 nm oxide confined VCSEL structure was studied and the high performance 850 nm oxide confined VCSEL were fabricated. The threshold currents of the 12 μm and 16 μm aperture are respectively 1.2 mA and 1.8 mA at 25 ℃. The slope efficiency is 0.58 mW/mA. The resistances are respectively 35 Ω and 25 Ω. The devices show good temperature characteristics and reliability. It can be used as the 1.25 Gbit/s data communication source.  
        关键词：vertical cavity surface emitting lasers（VCSEL）;GaAs;distributed Bragg reflector   
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      • CHEN Ying-mei,WANG Zhi-gong,ZHU En,FENG Jun,ZHANG Li
        Issue 2, Pages: 39-41(2004) DOI: 10.13756/j.gtxyj.2004.02.012
        摘要：This paper presents two circuit techniques of full switching delay cells and dual-delay path to design a high operate frequency, low noise ring oscillator. An even-stage ring oscillator is adopted to generated two quadrature output clock of 90 degrees phase differences. The chip is fabricated in 0.18 μm CMOS process, VCO operates at 4.9 GHz to 5.5 GHz, the simulated phase noise is -119.3 dBc/Hz at 5 MHz offset. With the 1.8 V-power supply, the core circuit power is 30 mW, the chip core area is 60 μm×（60 μm.）  
        关键词：VCO;CMOS oscillator;ring oscillator;phase noise   
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      • LI Zhi-xiong,HE Dui-yan,HOU Rui,ZHOU Hui
        Issue 2, Pages: 42-44(2004) DOI: 10.13756/j.gtxyj.2004.02.013
        摘要：A new numerical method based on effective-index method with built-in　perturbation correction （EIMPC） is proposed to compute bend loss in integrated optical rectangular waveguides. Applying this method, relationship between bend loss in curved rectangular waveguides and its parameters （height, width and curvature radius） is analyzed. Numerical results of EIMPC are compared with that of mode theory, they agree well with each other. And some results and difference are also discussed.  
        关键词：bend loss;rectangular waveguides;effective-index method;curved waveguide   
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      • LI Jin-yan,LI Shi-yu,LI Hai-qing,YIN Hong-bing
        Issue 2, Pages: 45-47(2004) DOI: 10.13756/j.gtxyj.2004.02.014
        摘要：Along with the development of optical communication, all kinds of optic fiber in existence can not meet the requests of DWDM, but S+C+L band new single mode fiber has enough dispersion at 1 460～1 625 nm to restrain FWM and XPM nonlinear effects. At the same time, its dispersion and slope is very low that can reduce the cost of dispersion management. We designed the structure of this kind of fiber and analysed its properties.  
        关键词：S-C-L band;nonlinear effect;dispersion;dispersion slope   
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      • CAO Qian,LIU De-ming,JIANG Wei,KE Chang-jian
        Issue 2, Pages: 48-50(2004) DOI: 10.13756/j.gtxyj.2004.02.015
        摘要：In this article, the design of automatic measurement system for the spectrum of the channel of DWDM is demonstrated. The structure of the system and the design of its control software are analyzed. And the property of DWDM is analyzed on the base of the experiment result. The properties of GPIB interface and the method of use of GPIB card are also introduced. There is comparison between IEEE488.2 and IEEE488, it makes the code more easy to understand.  
        关键词：GPIB;DWDM;Visual Basic;tunable laser;optical power meter   
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      • ZHAO Tong-gang,WU Yong-gang,REN Jian-hua,ZHAO Rong-hua,LIN Jin-tong
        Issue 2, Pages: 51-54(2004) DOI: 10.13756/j.gtxyj.2004.02.016
        摘要：In this paper, the basic theory of frequency chirp in semiconductor lasers is discussed. The relation between linewidth broadening factor and semiconductor’s linewidth can be obtained by utilizing wave equations. The consistence between linewidth broadening factor and chirp parameter in optical fiber communication system is analyzed emphatically. Using Gaussian pulse as signal source, we study the effect of linewidth broadening factor and group velocity dispersion together on the performance of optical fiber communication system by solving nonlinear Schrdinger equation.  
        关键词：linewidth broadening factor;chirp;Semiconductor laser;chromatic dispersion;optical fiber communication system   
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      • CHONG Ying-zhe,REN Xiao-min
        Issue 2, Pages: 55-58(2004) DOI: 10.13756/j.gtxyj.2004.02.017
        摘要：This paper first introduces the structures, waveguiding principles and design parameters of microstructure optical fibers （MOF）. And then discusses several special features of MOF and their future applications in optical communications systems. Finally the future research of MOF in our country is envisioned.  
        关键词：MOF;PCF;microstructured photonics;dispersion;nonlinearity;PBG   
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      • LIN Xiu-qin~1,FU Hua-jun~2
        Issue 2, Pages: 59-60(2004) DOI: 10.13756/j.gtxyj.2004.02.018
        摘要：This article introduces short circuit current test and the results of optical fiber composite ground wire（OPGW）.  
        关键词：optical fiber composite ground wire（OPGW）;lightning strike;short circuit current   
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      • XIN Xiang-jun,YU Chong-xiu,LI An-jian
        Issue 2, Pages: 61-63(2004) DOI: 10.13756/j.gtxyj.2004.02.019
        摘要：A simple method is proposed to adjust Raman fiber amplifiers’ gain flatness by means of a broadband amplified spontaneous emission （ASE） light source. The gain ripple of 20-channel is below 1 dB, and the gain spectrum is nearly the same with the ASE’s when the same pump deployment is used. The method is simple and easy to operate and can be utilized to optimize the performance of the Raman fiber amplifier used in DWDM system without using expensive DWDM signal source whose operation is complicated.  
        关键词：broadband amplified self-emission （ASE） light source;DWDM;Raman fiber amplifier （RFA）   
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      • FANG Jun-bin,LIU Wei-ping,LIN Shi-xiang,HUANG Hong-bin,CHEN Shun-er,CHEN Dong-ming
        Issue 2, Pages: 64-66(2004) DOI: 10.13756/j.gtxyj.2004.02.020
        摘要：SoC-based laser source driver introduced in this paper integrates digital circuits and simple analog circuits. This system can constrain power-floating and temperature-floating in LD effectually and provide a high-stability optical signal output.  
        关键词：SoC;high-stability;laser source   
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      • SUN Yi-ling~
        Issue 2, Pages: 67-70(2004) DOI: 10.13756/j.gtxyj.2004.02.021
        摘要：This paper summarizes the structure, operation and analysis method of multimode interference couplers, mainly describes the light propagation in multimode waveguide. Finally their applications in optical communication system are presented.  
        关键词：multimode interference coupler;optical communication;self-imaging effect   
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      • Issue 2, Pages: 70(2004)
          
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