Parametric Investigation Of Different Modulation Techniques On Free Space Optical Systems

Abstract

Free Space Optics systems (FSO) is one of the evolving wireless technologies. FSO is the only technology with highest data rates in wireless mode of operation but it suffers from bad weather conditions. In this work, analysis is carried out on FSO system having certain parameters constant using different modulation formats (i.e. RZ, NRZ, MDRZ, MODB and CSRZ). Impact of data rate, link range, input power and attenuation factor has been computed. Weather conditions are supposed to be nearly clear and suitable for FSO communication while taking attenuation factor up to 10dB/Km. Q-factor, received signal power and BER is calculated in all scenarios for obtaining an estimate of system performance. Results have shown that NRZ & RZ formats are in the lead until now with highest Q values.