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Progress in optical wireless communication (OWC) has unleashed the potentialto transmit data in an ultra-fast manner without incurring large investmentsand bulk infrastructure. OWC includes wireless data transmissions in threeoptical sub-bands; ultraviolet, visible, and infrared. This paper discussesinstalling infrared OWC, known as free space optics (FSO), systems on top ofinstalled radio frequency (RF) networks for outdoor applications to benefitfrom the reliability of RF links and the unlicensed broad optical spectrum, andthe large data rates carried by laser beams propagating in free space. Weequally review commercially available solutions and the hardware requirementsfor RF and FSO technology co-existence. The potential of hybrid RF/FSO forspace communication is further discussed. Finally, open problems and futureresearch directions are presented.

Retrofitting FSO Systems in Existing RF Infrastructure: A Non-Zero Sum Game Technology