Abstract
Free Space Optical (FSO) communication system is known for its high capacity, very large bandwidth, high directivity, non-licensed spectrum and many more advantages. The main issues in any communication system are security and privacy. Although FSO communication is more secure than Radio Frequency (RF) communication system, however, FSO communication still suffer from security threats due to tapping or beam spillage issues. The use of chaotic signals in communication leads to a revolution in the history of secure transmission of information. Therefore, in this manuscript, we aim to improve the security of FSO communication system taking Gamma-Gamma turbulence model using Differential Chaos Shift Keying (DCSK). The performance of the proposed chaotic FSO system is studied taking into consideration different turbulence conditions and analytical expression of probability of error has been derived.
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