Spatial Diversity for Fiber-Bundled FSO Nodes With Limited Mobility

In spite of exceptional advantages demonstrated by optical wireless signals, alignment distortion from building sway or transceiver displacement, make the development of corresponding high-speed links less attractive. This paper investigates a fiber-bundled design providing limited transceiver mobility. By placing three fibers horizontally behind a convex lens, angular diversity is exploited. A modified scheme of switched diversity is utilized to combine signals from various receiving fibers. Coverage area, combiner processing load, bit error rate, and outage probability served as performance criteria throughout the analytical and simulation assessment. High bit error performance was achieved while maintaining low implementation complexity over a turbulent fading channel.