Abstract
Free space optical (FSO) communication involves the use of optical or laser beams to send the information through the atmosphere. The key towards our vision is the use of FSO technology which in contrast to traditional wireless of RF technologies has lower interference footprint, can support longer range and offers higher bandwidth. In this paper we review the recent advances made in the field of data security for the FSO link along with certain aspects of FSO which make this technology most secure than the other existing technologies and discuss future research direction needed to bring FSO to the realm of practice.
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