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Optical wireless communication is a kind of telecommunication which transmits information through air with wavelengths in nanometers between optical transmitters and optical receivers. This kind of communication which has attracted scientists and producers lately, has been showing itself in several fields like satellite-to-satellite communications and military applications and introduced a new research to the communication world. In this study, the basic subjects related to wireless optical communication has been taken in hand and the hardware and the software which is essential for any wireless optical system achievement has been examined. Indoor free-space optical system has been described and an example algorithm and MATLAB code that would be used in this system has been improved.