Research On Wireless Laser Bridge System

As the communication bridge of wireless network,wireless network bridge has the function of data filtering,forwarding and transmission,it plays an important role in the construction of communication network.The traditional wireless network bridge uses microwave as transmission carrier.At present,the modernization level of our country is constantly improving,and the information demand is increasing day by day.The current wireless network bridge system is crowded with small capacity and lack of resources.In order to meet the increasing demands of people on communication networks,the transmission technology based on wireless optical communication will play an important role in development of communication in the future.This paper studies a wireless network bridge system with laser as the information carrier,which can quickly,flexibly and efficiently construct communication network,and has obvious strain effect in special circumstances(such as natural disasters,emergencies,emergency situations,etc.).In this paper,the influence factors of laser in the process of atmospheric transmission are studied.The solution of atmospheric turbulence and dispersion based on multi-channel transmission technology and APT technology is analyzed.In this system,the two ends of the machine are seted up on the fixed point to facilitate the realization of beam alignment.In order to reduce the influence of dispersion on the quality of communication effectively,optical transmission use the parttern of four rounds and four receipts.Under the designation of system,the wireless network bridge and free space laser communication technology are combined to achieving the overall design of the wireless laser network bridge,and the system structure of signal reduction from laser emission,atmospheric transmission,laser reception and signal reduction is completed.Wireless laser bridge system is mainly composed of optical system,laser emission unit,laser receiving unit,control unit,interface unit and other structures.Based on the consideration of the reliability and stability of the system,the principle and circuit diagram of each unit are analyzed and designed.Based on the system practicality,the system is compatible with two modes: network interface and fiber interface.In emergency or special situations,the fiber optic interface can also be used to complete data transmission.The choice of interface is controlled by single chip microcomputer.The two ports cooperate to provide many possibilities for the application of wireless laser bridge system.Finally,through the 1 km demonstration experiment,the system performance analysis was completed,the target effect was finally achieved,and the shortcomings in the system and the experiment were analyzed and summarized.