FSO无线光通信英文介绍

2. Principle
universal turntable unipod
tripod
Ultraviolet NLOS communication
3. Application
3.1 Domestic application
Number 1 2 3 Time(year) 1999 2005 2008 Rate(Mb /s) 8 155 2500 Range(km) 4 10 2
3. Application
3.2 Application in the USA unmanned system


In the roadmap, they discussed the advantage of optical communication system in unmanned system. Optical routers will be more practical when they employ unmanned high-flying vehicles like the Global Hawk, Boeing’s Phantom Eye, and the X-37B. LOS optical links have successfully been demonstrated at link ranges in excess of 50 km. Applications could apply to fixed locations and in air-to-air and ship-to-ship scenarios. Theoretical estimates indicate that air-to-ground links are feasible at rates up to 100 Mbit/s for link slant ranges up to 100 km, depending on atmospheric conditions. Due to the extreme narrow beamwidth of such systems, maintaining pointing accuracy to and from a moving unmanned system will be a major challenge (>2020).
ultraviolet and visible light communication
4
2. Principle
optical antenna optical transceiver atmosphere laser optical antenna optical transceiver
In the transmitter, the laser which is modulated by electrical signal is launched out by the lens(透镜) of optical antenna. After the transel, the laser arrives at optical receiver. Laser detector that has high sensitivity will change the optical signals into electrical signals.
1. Overview
What is FSO? Optical Communication is divided into optical fiber( 光 纤 ) communication and wireless optical communications. Free Space Optics(FSO) is a communication method whose information carrier is laser(激光) and whose information channel is atmosphere. It can transmit speech, data, image and so on. As a kind of wireless optical communications, FSO is a coalition( 结 合 ) of fiber and electromagnetic communication, a supplement( 补 充 ) of wired communication technology.
3. Application
In a university of Beijing, the FIBERLESS-2500 equipment is used to connect teaching building and central laboratory for data transmission. Communication range is up to 1.5 km.
3. Application
A recently completed DARPA program, Free Space Optical Experimental Network Experiment, employed a hybrid optical/RF communication technology. Type air to air air to ground Rate(Gbps) 3 to 6 3 to 9 Range(km) >200 >130
FSO is a line-of-sight(LOS) communication method. The system will work normally if there is no barrier between the transmitter and receiver, and the optical power is enough. dust barrier turbulence
4. Conclusion
After analyzing the new version of unmanned systems integrated roadmap comprehensively, combining with current development situation of the unmanned system both at home and abroad, measurement, control and information transmission technology of the future is developing from the platform to networking combat mission. In 2030, unmanned system needs 500 Mbps data rate(line-of-sight) at least. The key technology of information transmission in the unmanned system is improving data transmission rate. This is what FSO and optical communication need to do.
In 2009, the 2.5G FSO communication system was firstly equipped in the army.
3. Application
In an airfield located in the southwest, the FIBERLESS-100 equipment is used to connect the center monitoring room and navigation console at rates up to 100Mbps. It can transmit video and data signals. Communication range is up to 5 km.
2. Principle
Capacity
Confidentiality
Characteristics
Convenience
Flexibility
2. Principle
2. Principle
What is ATP?
It means Acquisition, Tracking and Pointing. It is one of the FSO key technologies which is used to aim the light beam of two sides. The ATP system includes coarse and fine tracking systems.
A set of FSO equipment is equal to a pair of optical fiber in practical use.
FSO visible spectrum
400 nm 500 nm 600 nm 700 nm
Near Infrared
850 nm 1310 nm 1550 nm