Abstract
The modern era of communication needs a system with high bandwidth and high speed datarates.To fulfill rapid demands in today’s technology era, Free space optical (FSO) communication system has become very attractive technology, because they provides high bandwidth, license free spectrum using infrared beam, and are a reliable means of communications. The first part of the paper introduces the FSO system its block diagram and also the reason behind its usage. The second part informs about the factors which impairs the performance of the system. The third part will define the factors which enhance the performance of FSO system. The fourth part here will discuss which type of frequency is better for FSO system. The last part will describe about the different modulation techniques and which  modulation is good for FSO system.Â
Highlights
Over the last two decades free-space opticalcommunication (FSO) has become more and more interesting as an adjunct or alternative to radio frequency (RF)communication.Free Space Optics (FSO) has become a major topic in world of wireless and optical communications.It provides a high data rates up to several Gbps, immune to radio frequency interferences, requires no licensing, gives a highly secured communication link due to the usage of a very narrow beam angle and offers an inexpensive, fast and easy deployment when compared to the fiber optic installation [1]
Theory analysis and numerical results illustrate that with the same bandwidth, Differential Phase Shift keying (DPSK) system has a higher sensitivity than on-off keying (OOK), and to a certain extent DPSK format can reduce the impairment from turbulence induced scintillation for its threshold being signal intensity insensitive, and DPSK format is very suitable for atmosphere channels and has a broad prospect in wireless optical communications[21]
FSO have the potential to improve the standard of communication in a large number of applications due to benefits such as high bandwidth, high data rate, license free network, easy installation and many more
Summary
Over the last two decades free-space opticalcommunication (FSO) has become more and more interesting as an adjunct or alternative to radio frequency (RF)communication.FSO has become a major topic in world of wireless and optical communications.It provides a high data rates up to several Gbps, immune to radio frequency interferences, requires no licensing, gives a highly secured communication link due to the usage of a very narrow beam angle and offers an inexpensive, fast and easy deployment when compared to the fiber optic installation [1]
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