通信信号相关法实现TDM-PON光网络中光纤故障的实时诊断

发布时间：2018-05-14 00:05

本文选题：TDM-PON网络 + 相关法探测技术　；参考：《太原理工大学》2017年硕士论文

【摘要】：光纤通信系统因其高传输速率和大传输容量的特点,长期以来都是各界学者们的主要研究内容。随着光网络的迅速发展,光纤通信的大范围使用,大量的人开始依靠于该网络系统。但是,随着光纤通信链路的大规模铺设,一旦在通信的传输进行中光纤链路出现问题,会造成的很大的经济损失。因而,能够实时地诊断并且定位出传输链路中的问题出现的位置,从而保证网络系统传输的正常进行,长期以来都是光通信领域被关注的热点内容。截止到现在,商用的光时域反射仪(OTDR)一直被用作诊断和定位光传输网络中光纤故障。但是,该设备的成本较高,设施相对复杂,且由于其自身测量的局限:不能够兼顾高的空间分辨率与长的测量距离,并不能够在相对复杂的光网络环境中完成故障的检测。通过对现有光网络中故障的检测技术的研究,以及以上的这些问题,本文主要针对TDM-PON光通信网络提出了一种低成本的、可实现在线检测的,TDM-PON光纤故障点诊断的新方法。光通信网络中的通信信号,和它在光纤中传输时产生的后向瑞利散射信号,具有δ函数型的相关曲线。曲线上峰值的位置,以及大小都携带着光纤反射点的信息,根据这些信息再结合相关法检测技术便可诊断出故障的位置。本文提出的方法即利用光纤链路中的传输信号自身作为参考光和探测光,再结合相关探测法,通过检测参考光和瑞利散射光的互相关曲线,进而诊断、定位光纤链路中的故障点。此方法成本低廉,可同时实现高分辨率、大动态范围的在线检测,本文针对光网络中的故障实时诊断的研究,主要介绍了以下的工作内容:1)介绍了光接入网的基本结构及其目前的发展状况,并对接入网中所包含的有源光网络与无源光网络进行了详细的分析说明。2)分析介绍了TDM-PON中现有的故障检测技术,对相关法检测技术做了一个简要的说明,并在此基础上提出了使用光纤链路中传输信号自身作为探测信号实现TDM-PON中的故障检测的方案。3)通过具体的实验,搭了一个小型TDM-PON平台,利用该网络中传输的信息进行了故障检测,实验结果证实了使用光纤链路中传输的通信信号本身结合相关法检测技术可以实现TDM-PON网络中的光纤故障检测。而且此方法在TDM-PON中的故障进行检测时,不仅可用于检测TDM-PON网络中光纤的单故障,而且可精确定位网络中的双故障、甚至多故障,并达到了12cm空间分辨率。
[Abstract]:Because of its high transmission rate and large transmission capacity, optical fiber communication system has long been the main research content of scholars from all walks of life. With the rapid development of optical network and the wide use of optical fiber communication, a large number of people begin to rely on the network system. However, with the large-scale laying of optical fiber communication link, once there is a problem in the transmission of optical fiber link, it will cause a great economic loss. Therefore, it can diagnose and locate the position of the problem in the transmission link in real time, so as to ensure the normal transmission of the network system. It has been a hot topic in the field of optical communication for a long time. Up to now, the commercial optical time domain reflectometer (OTDR) has been used to diagnose and locate optical fiber faults in optical transmission networks. However, the equipment has high cost and complex facilities, and because of its own measurement limitations: it can not take into account the high spatial resolution and long measurement distance, and can not complete fault detection in the relatively complex optical network environment. Based on the research of the existing fault detection techniques in optical networks and the above problems, this paper presents a new method of fault point diagnosis for TDM-PON optical communication networks, which is low cost and can be used to detect the fault points in optical fiber of TDM-PON on line. The communication signal in the optical communication network and the backward Rayleigh scattering signal generated by the optical fiber have a correlation curve of 未 function type. The position and size of the peak value on the curve carry the information of the reflection point of the fiber, according to which the fault location can be diagnosed by combining with the correlation detection technique. The method proposed in this paper uses the transmitted signal in the fiber link itself as the reference light and the detection light, combined with the correlation detection method, by detecting the cross-correlation curve between the reference light and Rayleigh scattering light, and then diagnosing. Locate fault points in fiber links. This method is low cost and can realize high resolution and large dynamic range of on-line detection at the same time. In this paper, the real-time fault diagnosis in optical network is studied. This paper mainly introduces the following work content: 1) introduces the basic structure of optical access network and its current development. The active optical network and passive optical network included in the access network are analyzed in detail. 2) the existing fault detection technology in TDM-PON is introduced, and a brief explanation of the correlation method detection technology is given. On the basis of this, a scheme of using the signal transmitted in fiber link itself as the detection signal to realize the fault detection in TDM-PON is put forward. Through the concrete experiment, a small TDM-PON platform is built. The fault detection is carried out by using the information transmitted in the network. The experimental results show that the optical fiber fault detection in TDM-PON network can be realized by using the communication signal transmitted in the optical fiber link itself and the correlation detection technology. This method can be used not only to detect the single fault of optical fiber in TDM-PON network, but also to accurately locate the double fault or even multiple fault in TDM-PON network, and achieve the spatial resolution of 12cm.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1

【相似文献】