城域接入融合网络及关键技术研究

发布时间：2018-06-18 01:05

本文选题：城域接入融合 + 可重构光分插复用器　；参考：《电子科技大学》2017年博士论文

【摘要】：近年来,随着有线/无线业务多样化和终端用户不断增加,大量数据流在城域网络(MAN)进行汇聚和交换,其流量增长速率已是骨干网流量增长速率的两倍。此外,传统网络体系结构下的城域网和接入网具有较为复杂的网络基础设施建设,这不仅消耗了网络资源,也给网络的升级优化带来不便。为了适应网络流量的不断增长,传统城域网和接入网的无缝融合是未来网络演进的一个潜在趋势。本文以城域接入融合网络(MAIN)作为研究对象,利用不同用户接入技术、信号调制/解调技术和信号交换技术,对基于“环形+树形”的城域接入融合网络架构进行了设计,并对其网络交换节点使用的可重构光分插复用器(ROADM)进行深入研究。同时,对MAIN全光虚拟专用网络(AOVPN)实现进行讨论,并设计支持并发式AOVPN通信的MAIN网络架构。本文主要创新性工作如下:1.利用正交频分复用(OFDM)、正交频分多址接入(OFDMA)、OFDM子带复用、时分复用(TDM)和偏振复用(PDM),提出了偏振复用子带间插OFDM MAIN网络架构。网络上/下行OFDM子带信号占用不同偏振态且子带频谱间插,提高了网络带宽资源利用率。混合接入方式使整个网络具有更高的灵活性和可扩展性。网络交换节点中的ROADM具有简单系统架构,网络终端节点采用传统OFDM收发机进行信号调制/解调,使网络具有较高可升级性。理论分析了光信号中光载波分量和子带信号间相位失配带来的影响,并讨论了上/下行多子带信号接收机的信号处理过程。2.采用数字滤波器接入(DFMA)和波分复用(WDM),提出了基于WDM-DFMA的强度调制和直接探测(IM-DD)MAIN网络。DFMA技术的使用不仅简化了网络带宽分配、提高了带宽利用率,同时改善了网络的灵活性、弹性、适应性和可升级性。利用无源光耦合器和强度调制器,提出了基于数字信号处理(DSP)的低成本、低功耗ROADM,其不仅可以实现波长、子载波带和正交子带信号的动态上路和下路,而且对输入信号调制格式、数字滤波器特性、光纤传输特性和终端接收机配置等具有较高的鲁棒性。利用商用低成本光电器件,对此ROADM的正交子带信号的下路功能进行了实验验证。3.提出了基于WDM-DFMA的相干MAIN网络。该网络不但拥有更大的网络系统容量和网络覆盖、同时具有灵活的网络带宽分配和更高的网络弹性。针对相干DFMA网络系统,利用马赫-曾德尔调制器(MZM),提出了两种简单可行的ROADM下路方案,并对其进行了理论推导和数值验证。结果表明,这两种方案不仅具有相同的下路性能,而且可以带来近10dB的ROADM下路性能改善,同时对调制指数变化具有较高的鲁棒性。其次,研究结果还表明提出的ROADM下路方案对非理想下路MZM消光比、下路射频信号相位偏移、光纤传输损伤和不同DFMA系统数字滤波方案具有较高鲁棒性。此外,针对基于WDM-DFMA的相干MAIN网络,研究了最佳数字滤波方案和数字滤波器分配方案。4.针对单环形和多环形MAIN网络,研究了VPN通信的分类。提出了基于WDM的MAIN网络架构,其不仅可以支持并发式AOVPN通信,而且可以动态地建立和拆除AOVPN通信。同时,理论分析了VPN通信的可扩展性,且深入讨论了动态VPN带宽分配。最后,利用基于IM-DD的OFDM系统,探索了光源线宽对网络通信性能的影响和MAIN网络中AOVPN通信的可行性。
[Abstract]:In recent years, with the diversification of wired / wireless services and increasing end users, a large number of data streams have been converged and exchanged in the metropolitan area network (MAN). The rate of flow growth has been two times the rate of growth of backbone network traffic. In addition, the metropolitan area network and access network under the traditional network architecture have more complex network infrastructure construction. This not only consumes the network resources, but also brings inconvenience to the network upgrading and optimization. In order to adapt to the continuous growth of network traffic, the seamless integration of traditional man and access network is a potential trend in the evolution of the network. In this paper, a metropolitan area access fusion network (MAIN) is used as the research object, using different user access technology, signal modulation / signal modulation / Demodulation technology and signal exchange technology are designed for the "Ring + tree" based metropolitan access fusion network architecture, and the reconfigurable optical plug and multiplexer (ROADM) used by its network switching nodes is deeply studied. At the same time, the realization of the MAIN virtual private network (AOVPN) is discussed, and the AOVPN communication is designed and supported. The main innovative work of this paper is as follows: 1. using orthogonal frequency division multiplexing (OFDM), orthogonal frequency division multiple access (OFDMA), OFDM subband multiplexing, time division multiplexing (TDM) and polarization multiplexing (PDM), the polarization multiplexing subband interplugged OFDM MAIN network architecture is proposed. The network / downlink OFDM subband signals occupy different polarization states and subband spectrum. Intercalation improves the utilization of network bandwidth resources. The hybrid access method makes the whole network more flexible and extensible. The ROADM in the network switching node has a simple system architecture. The network terminal node uses a traditional OFDM transceiver to modulate / demodulate the network, so that the network has a high scalability. The optical signal is analyzed theoretically. The effect of phase mismatch between the carrier component and the subband signal is discussed, and the signal processing process of the upper / downlink multiband signal receiver is discussed..2. uses digital filter access (DFMA) and wavelength division multiplexing (WDM). The use of the WDM-DFMA based intensity modulation and direct detection (IM-DD) MAIN network.DFMA is not only simplified for the network, but also simplifies the network. Bandwidth allocation improves bandwidth utilization and improves the flexibility, flexibility, adaptability and scalability of the network. Using passive optical couplers and intensity modulators, the low cost and low power ROADM based on digital signal processing (DSP) is proposed, which can not only realize the wave length, the subcarrier band and the positive subband signal 'dynamic upstream and downstream, but also the low power consumption. Moreover, it has high robustness for the input signal modulation format, digital filter characteristics, fiber transmission characteristics and terminal receiver configuration. Using commercial low cost optoelectronic devices, the next circuit function of ROADM's positive subband signal is verified by.3.. The WDM-DFMA based coherent MAIN network is proposed. Large network system capacity and network coverage, with flexible network bandwidth allocation and higher network flexibility. Aiming at coherent DFMA network system, using Maher Zeng Del modulator (MZM), two simple and feasible ROADM routing schemes are proposed, and their theoretical derivation and numerical verification are carried out. The results show that these two schemes are not only different. It has the same down path performance, and can bring about the near 10dB ROADM road performance improvement, and has high robustness to the modulation index change. Secondly, the research results also show that the proposed ROADM down route scheme has the MZM extinction ratio of the non ideal down path, the phase shift of the RF signal, the fiber transmission damage and the different DFMA system digital filtering. In addition, for the coherent MAIN network based on WDM-DFMA, the best digital filtering scheme and the digital filter allocation scheme.4. are studied for the single ring and multi ring MAIN networks, and the classification of VPN communication is studied. A WDM based MAIN network architecture is proposed, which can not only support and hairstyle AOVPN communication, but also can be used for AOVPN communication. AOVPN communication is dynamically established and dismantled. At the same time, the extensibility of VPN communication is analyzed theoretically, and the dynamic VPN bandwidth allocation is discussed in depth. Finally, using the OFDM system based on IM-DD, the influence of the line width of the light source on the network communication performance and the feasibility of the AOVPN communication in the MAIN network are explored.
【学位授予单位】：电子科技大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TP393.1

【参考文献】