Research On Fiber Winding Theory And Automatic Optical Distribution Frame

Outdoor communication wiring is mainly used to provide a physical connection between telecommunication services.Traditionally,cross-connections are manually installed,but manual operation is complicated and time-consuming.Labor is the biggest cost in running a telecommunications service provider business.With FTTH,IPTV,etc.pushing fibers to users gradually,broadband services with higher carrying and transmission speeds,providing high-level reliability services and reducing operational costs,the operator has a strong demand for an Automatic Optical Distribution Frame(AODF).Commercially available AODF products began to appear on the market,but only in small quantities,because the current robotic approaches have their limitations.At present,the robotic solutions of AODF can be divided into three categories:the first is the use of the principle of crossbar switching;the second is the robot simulation human hands,after the fiber has been unplugged,the fiber is pulled out from the dense fibers of the main distribution frame(MDF);the third is to use the robot connects the fiber according to the path specified by switching algorithm.This paper takes the robot that realizes automatic switching as the research object,combining the knot theory with the principle of weaving in the textile,and explores the cross-connect algorithm to prevent the fiber winding in the MDF,and the robot matching the switching algorithm.And researches have also been done on the structure of the MDF,key components of the switching robot,robot path planning,switching simulation and experiment,etc.The main researches are as follows:Firstly,starting from the problem of fiber winding in MDF,the knot theory of mathematics is used to analyze the winding of the fiber,and the basic cross-correlation of the junction is used to abstract the fibers into non-coplanar lines and the spatial relationship between the fibers is made clear.At the same time,with the topological approach,we proposed a method of constructing non-coplanar lines in different scenarios,such as the input with the output is one-dimensional(1-D)to 1-D,1-D to two-dimensional(2-D)and 2-D to 2-D.Secondly,taking the fibers as non-coplanar lines and judging their spatial relationship describing a non-winding cross-connect method called HIGHER ALWAYS ON TOP(HAOT)method.According to the number of the fiber on the fiber patch cords side of the patch panel or the upper and lower relationship of the spatial position of the fibers,if the position of the fiber in front of the target fiber is higher than that,it passes through the lower side,otherwise,it will crossover.By comparing the spatial relationship between the warp threads in the weaving machine and the spatial relationship of the optical fibers in the MDF,the weaving process of the weft insertion and the process of fiber cross-connect are compared,and the switching method of imitating the weft insertion is proposed.The weft insertion method of a variety of loom is studied,and the switching methods of simulating weft insertion of the rapier loom and the projectile loom are proposed.Thirdly,according to the proposed switching algorithm and switching method,the virtual prototype is designed to simulate the automatic switching process.The HAOT switching algorithm analyzes the fiber-optic motion space of 1-D to 1-D using a line match line form and line match circle form on the port panel and fiber side,and simulating the switching process.The switching process of imitating the rapier weft insertion consists of three parts:shedding,picking and shed closing,which are simulated in the virtual prototype.The driving source of the clamping device simulating the weft insertion of the projectile can be separated,and the switching process when the port panel is 1-D or 2-D is simulated separately.Finally,through the comparison of several methods,the better line match circle form was selected and the switching test was carried out in the prototype.The switching test in the prototype verifies the HAOT non-winding of cross-connect method and verifies the rationality of the switching robot design.