Geometric Loss Analysis for Single Curve Track FSO Ground to Train Communications Link

Recent years there is an increased demand for high-speed train (HSR) services. Consequently, onboard high-speed internet access needs to increase as passengers travel to and from work, therefore introducing new challenges and demand in delivering a seamless internet connection on-board fast-moving trains. Free Space Optical (FSO) Communications technology promises a bright future for various applications, due to its cost-effectiveness, ease of deployment, and huge unregulated bandwidth, which gives it an edge over contemporary technologies. However, due to lack of significant research on FSO links for railway communications, this paper looks into the single curved tracks mathematical models for FSO Ground-to-train (G2T-FSO) links proposed to overcome this issue and satisfy increased demand. Performance evaluation has been conducted in terms of geometrical properties were assessed in terms of divergence angle, geometrical loss, and theoretical received power using MATLAB®. The simulation results show significant effects of geometrical loss when the track curve length is more than 2m towards link performances.