【作者】 刘海；

【导师】 黄德修；

【作者基本信息】 华中科技大学 ， 物理电子学， 2009， 博士

【摘要】 无源光网络技术已经成为宽带接入领域新兴的主流技术，而混合无源光网络融合时分和波分无源光网络的技术优势，具有十分广阔的发展前景。本论文在国家十五863资助课题基础上，围绕混合无源光网络技术展开了系统深入的理论和实验研究。论文主要内容如下：(1)在系统研究混合无源光网络体系结构的基础上，提出了一种新颖的科学分类方法。将混合无源光网络分为两个大类：固定波长型和波长分配型，对其所属子类进行了进一步划分，并分别展开研究讨论。(2)基于十五863项目课题的研究，提出了一种基于波分多址的混合无源光网络WDMA-EPON系统方案，其上行采用波分多址接入技术，下行采用广播复用方式，并对该方案的关键技术展开了研究。运用OPNET仿真工具对WDMA-EPON系统进行理论仿真并建立了仿真模型。(3)采用自行研制开发的低成本光层器件和利用成熟的芯片解决方案，实现了高性价比的波分多址混合无源光网络WDMA-EPON系统产品样机，具有独创性和先进性。整套WDMA-EPON原型样机包含局端硬件设备、用户端硬件设备、系统嵌入控制软件和网络管理软件平台，进行了系统验证和试验网运行，并对系统功能和性能展开了全面测试。(4)研究了现有时分无源光网络的DBA动态带宽分配算法，并对其进行了改进，创新性提出了基于“带宽借贷”的动态带宽分配算法，仿真结果表明其在公平性等方面明显优于已有算法。对混合无源光网络的动态资源(包括波长和时隙)分配算法也进行了研究，给出了对多点控制协议MPCP的扩展，并在前述的改进DBA算法基础上，提出基于“带宽借贷”的DRA动态资源分配算法，通过仿真计算进行了算法比较和分析。(5)研究了无源光网络和无线网状网融合构成的无线混合无源光网络技术及其架构，并提出了一种新颖的基于遗传算法的无线混合无源光网络布局算法，仿真结果表明可以实现对混合网络的良好布局。更多还原

【Abstract】 Passive optical network technology has become the emerging technology of broadband access areas, and hybrid TDM/WDM PON is a promising optical access network solution which taking advantages of both TDM-PON and WDM-PON. The research in this dissertation was supported by the National High Technology Research and Development Program of China (863 Program) project "Gigabits Ethernet Based on Passive Optical Networks", launched a system-depth theoretical and experimental study around the hybrid passive optical network technology. The main contributions of this paper are as the followings:(1) Based on the research of hybrid passive optical network architecture, a novel classification method is proposed that divided the Hybrid-PON into two catalog: Wavelength-Fixed type and Wavelength-Assignment type. The subdivision type of both catalogs are also proposed, and been discussed in detail.(2) A WDMA based Hybrid-PON system scheme (WDMA-EPON) is specified in this dissertation, which using wavelength division multiple access technology in the upsteam direction and broadcasting mechanism in the downsteam direction.The system architecture and key technologies are discussed in detail, and system model is built with OPNET Modeler.(3) The WDMA-EPON prototyping system is successfully developed by self-made low cost optical components/devices and efficient chip solution, which achieve the cost efficiency and high performance. The whole prototyping system includes central office equipment, customer premises equipment, embedded system control software and network management platform. Pilot network constructed by those prototype devices are normally running up and put through the system-level validation, the main function and performance are fully tested.(4) Two novel DBA algorithms LLR and LWR based on bandwidth debit and credit were proposed to solve the problem of unfair bandwidth allocation in EPON. The main idea is that the OUT can debit and credit the excessive bandwidth from those lightly loaded ONUs to highly loaded ONUs, and when in burst of traffic data the bandwidth of those credit ONUs can be reimbursed from those debit ONUs. The simulation results showed that these algorithms performed well in successful assurance of the brought bandwidth of ONUs in normal utilization, rather than penalties executed on all ONUs in former algorithms when there were some greedy ONUs. (5) In integration of EPON and Wireless Mesh Network (WMN), this dissertation illustrated an novel hybrid wireless passive optical network architecture (HWPON), and specified a genetic algorithm based placement method to solve the node planning problem of the hybrid network. In this method, it optimized the installation cost of the hybrid network system, with satisfaction of the requirement on maximum hop counts and whole wireless routers connection status.更多还原