New Modulation Method in FSO Communication Using Different Wavelengths (650,532,405) nm in the Iraqi Weather

Abstract

"The FSO technique depends on the compatibility of the optical path between the transmitter and the receiver (line-of-sight) to transmit data between two points. FSO system uses the light to provide optical Contact to send and receive various data. This study shows the design of a new optical system for the transmission of voice through free space at wavelengths (650,532,405) nm within point-point technology for specified distances. What distinguishes this work is the quality of the reflection-based modulation based on the Doppler phenomenon. Also, it is interested in studying the different attenuation conditions of the atmosphere at the wavelengths used, in addition to the attenuation caused by the large laser beam divergence for distant distances. This study shows the quality of modulation used under different weather conditions and is characterized by very low cost and high efficiency for power sent"