Combining Wavelength Shift Keying And Differential Face Shift Keying For Free Space Optical Satellite Communication/

Abstract

Space laser is an emerging technology which is gaining more popularity because not only it provides greater and unlicensed bandwidth but also the Size, weight, and power (Swap) is reduced as compared to current radiofrequency (RF) system. Since this communication is over a long distance this technology faces some challenges like weather condition, atmospheric turbulence and electromagnetic turbulence. This research focuses on addressing these issues by balancing Differential Phase Shift keying (DPSK) and wavelength Phase shift keying. The proposed model works efficiently for Earth to LEO satellite links in low to medium turbulence. Main focus of the research is to analyze the system’s Bit Error Rate (BER) performance over varying communication distance.The results show that over long distances of thousands of kilometers the proposed model gives acceptable BER values even at maximum value of Earth to LEO satellite link. It is observed that Optical wireless links offer numerous benefits over radio frequency links, but they are susceptible to atmospheric conditions. The combined WSK and DPSK model work efficiently to mitigate the effect of atmospheric turbulence.