40Gb/s DWDM城域网的研究与仿真
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摘要
光纤通信技术正向着超高速、大容量通信系统发展,40Gb/sDWDM(密集波分复用系统)系统能够很好地满足IP宽带业务流量增长的需求,而且由于其具有系统维护简单、管理调度能力强等优点,使得它成为城域DWDM发展的最好选择。但传输速率越高,面临的问题就越多,尤其是对于城域网这种网络结构复杂多变的系统。本文就40Gb/sDWDM技术用于城域网需要考虑的问题做了分析和仿真,具体工作及结论如下:
(1)对适用于城域网的点到点40Gb/s DWDM系统做了分析和仿真,找出了在短距离传输中能取得良好性能且符合城域网低成本要求的发射机调制格式(MDRZ)、经济有效的色散补偿方式(DCF前置补偿)及不使用放大器和色散补偿的最大传输距离。
(2)设计了简单的城域环网,对环网设计中需要考虑的部分问题——功率预算、放大器控制模式及带内串扰控制带宽做了研究和仿真,得出结论:由于城域网的动态特性,在环网设计时必须采用单位增益放大器来满足各节点的功率要求;放大器要在增益控制模式下才能取得良好的传输效果;要采用合适的滤波器带宽来控制串扰的产生。
Optical DWDM technology with ultra-high-speed and large-capacity is the best choice for metro network development. Its speed is 40 Gb/s, which makes the best demand of the growth of IP broadband services, Its system have some advantage of maintenance simply, in system, esey scheduling, etc. But the higher the transmission rateis, the more problems we must solve, especially for metro network with complex and changeable structure. Aiming at metro DWDM system with 40Gb/s, some problems were analyzed and simulated. Specific work and conclusions are as follows:
(1) Point to point 40G DWDM systems which applies to MAN were analyzed and simulated, then it gets that the most preferable transmitter modulation format (MDRZ) in short-distance transmission ,because it can achieve good performance and meet the cost requirements of metro, economic effective dispersion compensation method (DCF pre-compensation) and the maximum transmission distance without amplifiers or dispersion compensation.
(2) A simple optical ring metro network was designed, and part of problems of power budget, amplifier control mode and the bandwidth to control interband crosstalk, need to be considered in the design were researched and simulated, and the conclusions are as follows: Due to the dynamic nature of MAN, the ring must be designed with unity-gain amplifier to meet the power requirements of each node; Amplifier should be set to gain control mode in order to achieve good transmission results; The appropriate filter bandwidth should be choosed to control the crosstalk generation.
(1)对适用于城域网的点到点40Gb/s DWDM系统做了分析和仿真,找出了在短距离传输中能取得良好性能且符合城域网低成本要求的发射机调制格式(MDRZ)、经济有效的色散补偿方式(DCF前置补偿)及不使用放大器和色散补偿的最大传输距离。
(2)设计了简单的城域环网,对环网设计中需要考虑的部分问题——功率预算、放大器控制模式及带内串扰控制带宽做了研究和仿真,得出结论:由于城域网的动态特性,在环网设计时必须采用单位增益放大器来满足各节点的功率要求;放大器要在增益控制模式下才能取得良好的传输效果;要采用合适的滤波器带宽来控制串扰的产生。
Optical DWDM technology with ultra-high-speed and large-capacity is the best choice for metro network development. Its speed is 40 Gb/s, which makes the best demand of the growth of IP broadband services, Its system have some advantage of maintenance simply, in system, esey scheduling, etc. But the higher the transmission rateis, the more problems we must solve, especially for metro network with complex and changeable structure. Aiming at metro DWDM system with 40Gb/s, some problems were analyzed and simulated. Specific work and conclusions are as follows:
(1) Point to point 40G DWDM systems which applies to MAN were analyzed and simulated, then it gets that the most preferable transmitter modulation format (MDRZ) in short-distance transmission ,because it can achieve good performance and meet the cost requirements of metro, economic effective dispersion compensation method (DCF pre-compensation) and the maximum transmission distance without amplifiers or dispersion compensation.
(2) A simple optical ring metro network was designed, and part of problems of power budget, amplifier control mode and the bandwidth to control interband crosstalk, need to be considered in the design were researched and simulated, and the conclusions are as follows: Due to the dynamic nature of MAN, the ring must be designed with unity-gain amplifier to meet the power requirements of each node; Amplifier should be set to gain control mode in order to achieve good transmission results; The appropriate filter bandwidth should be choosed to control the crosstalk generation.
引文
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[9]翁颖,丁晓芦.WDM产品现状及主流厂商产品分析[J].通信世界,2003,34(36):65-67
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[12]张敏玲.光纤通信技术的发展现状与展望[J].跨世纪.2008,16(9):210-211
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[15] Tarek S.El-Bawab.“design considerations for transmission systems in optical metropolitan networks”[J], Opt.Fib Tech. 63, p.213,2000
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[20]许晖.全球40G高速传输系统规模商用起步.[2008-12-17] .http: //www.sina.com.cn
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[32] Kemal Bengi .“Access protocols for an efficient and fair packet-switched IP-over-WDM metro network.Computer Networks”[J], Volume 44, Issue 2, 5 February 2004, Pages 247-265
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[34] Padmaraj M.V. Nair, Suku V.S. Nair, et al.“Maher Ali.Bandwidth sensitive fast failure recovery scheme for Metro Ethernet.Computer Networks”[J], Volume 52, Issue 8, 12 June 2008, Pages 1603-1616
[35] Loukas Paraschis, Ori Gerstel, et al.“Frankel .Metro networks: Services and technologies”[C]. Optical Fiber Telecommunications V B (Fifth Edition), 2008, Pages 477-509
[36] A. Antonino, A. Bianco, et al.WONDER:“A resilient WDM packet network for metro applications. Optical Switching and Networking”[J], Volume 5, Issue 1, March 2008, Pages 19-28
[37]城域网建设中需要注意的有关问题.www.wangchao.net.cn
[38]王茂祥,胡晓菲等.移动城域网规划建设策略探讨[J].信息通信,2007,20(4): 61-63
[39]刘勇.宽带IP城域网建设中应当注意的几个问题.[2005-2-14].www.dev dao.com
[40] IP城域网建设的主要问题及思考.[2006-09-21].www.devdao.com
[41]城域网的建设与应用.[2006-4-14].www.cndw.com
[42]中国移动城域网建网思路探讨.www.devdao.com.
[43]孙文清.城域网建设思路[J].中国新技术新产品精选,2006,(5)
[44]孟博.铁通宽带IP城域网建设思路及技术方案分析[J].江苏通信技术,2006,22( 4): 39-41
[45]范成泽.铁通徐州城域网建设思路的探讨[J].铁道通信信号,2004,40(1):9-10
[46]谭剑波.宽带城域网建设思路探讨[J].中兴通讯技术,2001,(1):2-4
[47]吴信川.城域波分组网的若干关键因素考虑[J].邮电设计技术, 2007-10
[48]熊世桓.40Gbit/s光传输系统主要影响因素及解决方法[J].光通信技术,2004,28(10):37-38
[49]张宾,胡庚强.高速40Gbit/s DWDM的发展[J].网络电信,2008,10(9):44-46
[50]许利民. 40Gbit/s波分技术发展及应用探讨[J].电信科学,2009,(1):7-11
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