Free Space Optics Seminar Report

            Free Space Optics (FSO) communications, also called Free Space Photonics (FSP) or Optical Wireless, refers to the transmission of modulated visible or infrared (IR) beams through the atmosphere to obtain optical communications. Like fiber, Free Space Optics (FSO) uses lasers to transmit data, but instead of enclosing the data stream in a glass fiber, it is transmitted through the air. Free Space Optics (FSO) works on the same basic principle as Infrared television remote controls, wireless keyboards or wireless Palm® devices. Optical free space communication is favourable for high data-rate, long-range point-to-point links, where the terminal size, mass, and power is limited, as for example on aeronautical or space platforms. Main advantages lie in a significantly higher data rate and the lower power/ space requirements of optical links compared to RF.One future application for optical links is the use on high altitude platforms (HAPs), which will be positioned at altitudes of about 20 to 30 km. Inter-platform links can have a range of at least 600km at these altitudes without cloud interference.HAPs do have the advantage of being more cost effective compared to satellites due to lower launch costs and also the possibility of easier maintenance and reconfiguration.Free space optics (FSO) is an emerging technology that has found application in several areas of the communications from inter-satellite links to inter-building links, it has been tried and tested. As with any technology, FSO has worked much better in some applications than in others.

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