Abstract
Free-space optical (FSO) communication is an alternative method of allocating high bandwidth links in short to medium range over RF communication systems. It is observed as a growing increase in research and development activities over the past few years due to the innumerous advantages. The advantages of FSO communication include a much larger data rate, lower power consumption, more compact equipment, greater security against eavesdropping, better protection against electromagnetic interference and license free data transmission. However, the performance of the FSO system is greatly influenced by atmospheric temperature, pressure, humidity etc. To overcome these challenges various techniques have been proposed in the literature. Generally, the average bit error rate (BER) and quality factor (Q-factor) are prime parameters to measure the performance of the FSO systems. In this paper, a comparative study and mathematical modeling have been done using differential phase shift keying (DPSK) modulation technique with Manchester coding to conventional DPSK modulation technique for different FSO configurations. Manchester encoding synchronizes the signal itself; hence, it minimizes the error rate and optimizes the reliability of the system. For analyzing, the low to high turbulence level of atmosphere Gamma-Gamma type channel model is preferred.
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