“2010 is the beginning of the decade of wireless optical communications” Dr Larry B. Stotts,Defense Advanced ResearchProjects Agency (DARPA),IEEE Spie Optics & Photonics,San Diego (USA), August 2009
The wireless optical communication systems were the first to be used (Figure 3.1) and, due to technological innovations, they become attractive, mainly because of the lack of produced or suffered radio interference and, especially, from the ever-increasing demand of the data rate.
Before presenting the daily and contemporary applications of wireless optical communication, we define some basic principles and the different modes of propagation.
Wireless optical communications refer to the use of light propagation in the field of optics with free space as a transmission medium.
An example of the principles of operation is detailed in Figure 3.2 with various technical modules present in an optical wireless in emission (Tx) and in reception (Rx). At the transmission (Tx), from digital data received by a computer or a server via a suitable interface (D-Tx), a digital and analog electronic processing (El-Tx) is performed to adapt the signals to electrical-optical converter (Ot-Tx). This converter is ...