本文選題：TDM-PON網(wǎng)絡 + 相關法探測技術��； 參考：《太原理工大學》2017年碩士論文

【摘要】：光纖通信系統(tǒng)因其高傳輸速率和大傳輸容量的特點,長期以來都是各界學者們的主要研究內(nèi)容。隨著光網(wǎng)絡的迅速發(fā)展,光纖通信的大范圍使用,大量的人開始依靠于該網(wǎng)絡系統(tǒng)。但是,隨著光纖通信鏈路的大規(guī)模鋪設,一旦在通信的傳輸進行中光纖鏈路出現(xiàn)問題,會造成的很大的經(jīng)濟損失。因而,能夠實時地診斷并且定位出傳輸鏈路中的問題出現(xiàn)的位置,從而保證網(wǎng)絡系統(tǒng)傳輸?shù)恼＿M行,長期以來都是光通信領域被關注的熱點內(nèi)容。截止到現(xiàn)在,商用的光時域反射儀(OTDR)一直被用作診斷和定位光傳輸網(wǎng)絡中光纖故障。但是,該設備的成本較高,設施相對復雜,且由于其自身測量的局限:不能夠兼顧高的空間分辨率與長的測量距離,并不能夠在相對復雜的光網(wǎng)絡環(huán)境中完成故障的檢測。通過對現(xiàn)有光網(wǎng)絡中故障的檢測技術的研究,以及以上的這些問題,本文主要針對TDM-PON光通信網(wǎng)絡提出了一種低成本的、可實現(xiàn)在線檢測的,TDM-PON光纖故障點診斷的新方法。光通信網(wǎng)絡中的通信信號,和它在光纖中傳輸時產(chǎn)生的后向瑞利散射信號,具有δ函數(shù)型的相關曲線。曲線上峰值的位置,以及大小都攜帶著光纖反射點的信息,根據(jù)這些信息再結合相關法檢測技術便可診斷出故障的位置。本文提出的方法即利用光纖鏈路中的傳輸信號自身作為參考光和探測光,再結合相關探測法,通過檢測參考光和瑞利散射光的互相關曲線,進而診斷、定位光纖鏈路中的故障點。此方法成本低廉,可同時實現(xiàn)高分辨率、大動態(tài)范圍的在線檢測,本文針對光網(wǎng)絡中的故障實時診斷的研究,主要介紹了以下的工作內(nèi)容:1)介紹了光接入網(wǎng)的基本結構及其目前的發(fā)展狀況,并對接入網(wǎng)中所包含的有源光網(wǎng)絡與無源光網(wǎng)絡進行了詳細的分析說明。2)分析介紹了TDM-PON中現(xiàn)有的故障檢測技術,對相關法檢測技術做了一個簡要的說明,并在此基礎上提出了使用光纖鏈路中傳輸信號自身作為探測信號實現(xiàn)TDM-PON中的故障檢測的方案。3)通過具體的實驗,搭了一個小型TDM-PON平臺,利用該網(wǎng)絡中傳輸?shù)男畔⑦M行了故障檢測,實驗結果證實了使用光纖鏈路中傳輸?shù)耐ㄐ判盘柋旧斫Y合相關法檢測技術可以實現(xiàn)TDM-PON網(wǎng)絡中的光纖故障檢測。而且此方法在TDM-PON中的故障進行檢測時,不僅可用于檢測TDM-PON網(wǎng)絡中光纖的單故障,而且可精確定位網(wǎng)絡中的雙故障、甚至多故障,并達到了12cm空間分辨率。
[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.
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.1

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