TWDM-PON系统架构方案及上行波长带宽分配算法的研究与应用

发布时间：2018-06-12 01:21

本文选题：无源光网络 + 混合时分波分无源光网络　；参考：《南京邮电大学》2017年硕士论文

【摘要】：无源光网络(PON)是当前固定宽带领域主要的技术方案之一。从多址接入方案角度,可以把PON分为基于时分的TDM-PON和基于波分的WDM-PON两大类。由于成本因素,现阶段光接入网环境中实际部署的仍以TDM-PON为主。TDM-PON演进方向主要有两个:一个是单波长更高传输速率,另一个就是WDM-PON。针对目前已经大量部署的TDM-PON,业界普遍认为在向未来WDM-PON过渡的一段时期,出于成本和系统平滑升级等因素的考虑,可以引入混合时分波分的TWDM-PON。TWDM-PON吸收了TDM-PON和WDM-PON的技术优点,拥有较高的安全性,并且有利于延长现有系统的生命周期。论文针对TWDM-PON系统架构及其动态波长带宽分配算法进行了研究,并基于典型应用场景提出了架构和算法的改进,通过理论分析和仿真实验对改进方案进行了验证。论文首先简述了TDM-PON和WDM-PON的技术特点,并对现有PON系统的系统架构和工作原理进行了分析。论文针对典型的商住混合楼宇应用场景,提出了一种TWDM-PON架构改进方案及动态波长带宽分配算法。改进方案支持不同类型ONU组间资源共享,在有ONU突发业务请求超出带宽限制时,OLT可以动态地切换其上行使用的波长以充分地利用系统整体的带宽资源并降低整体平均时延。理论分析和仿真实验表明,该系统总体时延性能有明显提升。而在系统抗毁性能上,该系统可以在不影响原ONU组内业务的同时支持邻组ONU的保护切换。
[Abstract]:Passive optical network (PON) is one of the main technology schemes in fixed broadband field. From the point of view of multiple access schemes, PON can be divided into TDM-PON based on time division and WDM-PON based on wavelength division. Due to cost factors, TDM-PON is still the main direction of TDM-PON evolution in optical access network environment. There are two main evolutionary directions: one is single-wavelength higher transmission rate, the other is WDM-PON. In view of TDM-PON, which has been deployed in large numbers at present, the industry generally thinks that in a period of transition to future WDM-PON, due to the consideration of cost and smooth upgrade of the system, TWDM-PON.TWDM-PON with TWDM-PON.TWDM-PON can absorb the technical advantages of TDM-PON and WDM-PON. It has high security and is helpful to prolong the life cycle of existing system. In this paper, the architecture of TWDM-PON system and its dynamic wavelength bandwidth allocation algorithm are studied. Based on typical application scenarios, the structure and algorithm are improved. The improved scheme is verified by theoretical analysis and simulation experiments. Firstly, the technical characteristics of TDM-PON and WDM-PON are briefly introduced, and the system architecture and working principle of the existing PON system are analyzed. In this paper, an improved TWDM-PON architecture and a dynamic wavelength bandwidth allocation algorithm are proposed for typical commercial and residential buildings. The improved scheme supports resource sharing among different types of ONU groups. When ONU burst traffic requests exceed the bandwidth limit, OLT can dynamically switch the wavelength used in its uplink to make full use of the overall bandwidth resources of the system and reduce the overall average delay. Theoretical analysis and simulation results show that the overall delay performance of the system is improved significantly. On the other hand, the system can support the adjacent ONU protection switch without affecting the traffic in the original ONU group.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1

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