Study On High Precision Diagnosis Technology Based On All Optical Network Fault

In today's information society,optical fiber network plays an increasingly important role.However,there are still some defects in optical fiber fault diagnosis technology and means,such as inaccurate location and fast speed.Once it fails,it cannot be repaired quickly.This dissertation aims to study the analysis based on OTDR(Optical Time Domain Reflectometer,OTDR)for rapid diagnosis of all-optical network fault location technology of high precision testing,chaxiu optimization method of remote fault and mixed fault types,to further improve the fault location accuracy of optical fiber,optical fiber fault quickly and accurately,can quickly restore the all-optical network fault.The following research work has been carried out mainly:First,the structure and characteristics of all optical network and optical fiber communication are studied and analyzed.The main methods and technologies of optical fiber fault diagnosis are analyzed,and the principles and key technologies of OTDR test curve analysis,fault location are also analyzed.The two is to analyze the cause of the error of OTDR test and the correction method.A case study is made to analyze the difference between the waveforms and event display of typical cable faults in OTDR test.The general causes and deep causes of OTDR test error are analyzed,and the best estimation value,correction value and uncertainty are studied.The three is to focus on the analysis of current situation and difficulties of repairing the fault point of long distance optical fiber,method of iterative approximation algorithm for rapid positioning of remote real fault point,and through the actual fault restoration case verification,put forward a rapid diagnosis method of remote fault point with high accuracy.The four is to focus on the analysis of characteristics and status of many types of cable chaxiu mixed fault research,using the multi-objective optimization methodis scientific and effective to sort multiple fault point,and through the actual fault restoration case verification,puts forward the optimal method for fault diagnosis of mixed type.