LR-PON的生存性和弹性机制研究

发布时间：2018-05-20 00:01

本文选题：保护倒换 + 故障定位　；参考：《山东大学》2017年硕士论文

【摘要】：随着互联网流量的爆炸式增长和光纤通道的传输速率不断提高,一旦网络出现故障,将会导致大量数据丢失和服务传输中断,为了使流量数据能够尽快避开故障链路传输到其他健康的链路或节点,提高光网络生存性,完善的故障监测定位和保护切换机制是非常重要的。论文针对目前光网络的生存性需求,提出了一种LR-PON的高效全保护机制。通过收集监控信息定位故障段后,NMS将通过切换光开关调控保护机制。论文所提出的保护方案可以保护LR-PON几乎所有光纤故障:环上的单光纤故障,光纤环上不同段中的多光纤故障,光纤环上同一段中的双光纤故障,从RN到PSC的光纤链路故障,以及从PSC到ONU的光纤链路故障。通过理论分析和仿真结果可知,论文提出的保护机制具有低成本,低损耗特点,同时网络具有高达99.9992%的高可靠性。此外,所提出的系统在正常工作模式和保护模式中的BER都可以满足系统的要求。为了使LR-PON生存性机制更加稳定可靠,系统应当可以实时地监测整个网络中的所有光纤链路和器件,并且应当尽可能快速精确地确定故障位置。为此,我们提出了一种高可靠性的快速精确故障检测及定位机制,通过光编码方案来监视全网所有的光纤链路和网络节点状态,并通过OTDR设备和可调谐开关精确定位故障的具体位置。在故障检测定位的同时,系统可以通过保护倒换抵御LR-PON(包括环形网络和树形网络)免受各种故障。论文分析了系统的恢复时间,损耗,成本,误码率等方面的性能,结果表明我们设计的LR-PON故障检测和定位方案具有成本和损耗的综合最佳结果。为了升级现有的有限覆盖范围和非弹性网络PON系统,论文提出了一种新型的SD-LR-PON系统,用于长距离城域接入网场景,并研究设计了弹性系统的关键器件全波段多模干涉型波分复用器,利用成对干涉和边入射成像机理,建立波导激发干涉区内导模的数学模型,结合输入输出波导对器件的影响,推导出了多模干涉器件的行为模式公式,从而确定了器件的参数,并分别用基于铌酸锂薄膜和二氧化硅波导完成了全波段解复用器的设计。此外,针对弹性光网络中频谱资源分布特点,论文建立了基于时域、波长域和子载波域的三维资源评价模型,并基于弹性度和频谱碎片度的分析建立了频谱效用函数。利用此函数,论文提出了改进的动态带宽分配算法,有效地降低了网络的资源碎片,提高了系统传输效率。
[Abstract]:With the explosive growth of Internet traffic and the increasing transmission rate of fiber channel, once the network fails, it will lead to a lot of data loss and service interruption. It is very important to improve the survivability of optical network in order to avoid the fault link and transmit the traffic data to other healthy links or nodes as soon as possible. It is very important to improve the fault monitoring location and protection switching mechanism. Aiming at the survivability of optical networks, an efficient full protection mechanism of LR-PON is proposed in this paper. After collecting monitoring information to locate the fault section, NMS will switch the optical switch to regulate the protection mechanism. The protection scheme proposed in this paper can protect almost all optical fiber faults in LR-PON: single fiber fault on the ring, multi-fiber fault in different segments of the fiber ring, double fiber fault in the same section of the fiber ring, and fiber link fault from RN to PSC. And fiber link failure from PSC to ONU. The theoretical analysis and simulation results show that the proposed protection mechanism has the characteristics of low cost and low loss, and the network has a high reliability of 99.9992%. In addition, the BER of the proposed system in the normal mode and the protection mode can meet the requirements of the system. In order to make the LR-PON survivability mechanism more stable and reliable, the system should be able to monitor all optical fiber links and devices in the whole network in real time, and the fault location should be determined as quickly and accurately as possible. For this reason, we propose a fast and accurate fault detection and location mechanism with high reliability. The optical coding scheme is used to monitor the state of all optical links and network nodes in the whole network. And through the OTDR equipment and tunable switch to locate the exact location of the fault. At the same time, the system can protect the LR-PON (including ring network and tree network) from all kinds of faults. In this paper, the recovery time, loss, cost and bit error rate of the system are analyzed. The results show that the proposed LR-PON fault detection and location scheme has the best result of cost and loss. In order to upgrade the existing limited coverage and inelastic network PON systems, a new SD-LR-PON system is proposed, which can be used in long distance metro access network scenarios. The all-band multimode interference wavelength division multiplexer of elastic system is studied and designed. By using the imaging mechanism of pairwise interference and edge incidence, the mathematical model of waveguide excitation guided mode in the interference region is established, and the influence of input and output waveguide on the device is also studied. The behavior mode formula of the multimode interference device is derived, and the parameters of the device are determined, and the design of the all-band demultiplexer based on lithium niobate thin film and silica waveguide is completed respectively. In addition, according to the characteristics of spectrum resource distribution in elastic optical networks, a three-dimensional resource evaluation model based on time domain, wavelength domain and subcarrier domain is established, and the spectrum utility function is established based on the analysis of elasticity and spectrum fragmentation. Using this function, an improved dynamic bandwidth allocation algorithm is proposed, which can effectively reduce the resource fragmentation of the network and improve the transmission efficiency of the system.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1

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