FREE SPACE OPTICAL COMMUNICATION SYSTEM

Abstract

The thesis ( free space optical communication system ) describes two methods for optical wireless system ( indoor and outdoor system),Also this thesis make a combination to a different types of all possible topologies that can be used , and it determined the suitable to each type of the optical wireless system . Also it introduce all elements that FSO system composed of it , where we have optical sources ,driver and modulator in the transmitter side , and at the other side we have lens to improve the collection area ,optical filters which are used to reject out unwanted wavelengths, and photodetector in addition to an amplification stage. Integration of transmitter and receiver in one unit provide a full duplex transmission ,there are two methods of integration in the first one (electic) the optical source in transmitter and photodetector in the receiver are discrete. The other method of integration is opto-electric here the optical source and photodetector are join with the other parts . In the practical side the thesis contain an experiment that we have done by designing a transmitter an receiver circuit and test some samples to notice the challenges that may face the optical signal while it propagate in the free space .