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Interest in free-space optics (FSO) is rapidly growing as a potentialsolution for the backhaul of next-generation mobile or low-orbit satellitecommunications. Various techniques have been suggested for employing anintelligent reflecting surface (IRS) in FSO systems, such as anomalousreflection, power amplification, and beam splitting. It is possible to delivermore power to the receiver (Rx) by collimating or focusing the reflected beamat the Rx lens. In this study, we propose a phase-shift design of an IRS forbeam focusing. In addition, we propose a new pointing error model and an outageperformance analysis applicable when the beam width is comparable to or lessthan the aperture size of the Rx. The analytical results are validated by MonteCarlo simulations. This study provides essential preliminary results for futureresearches that assume a focused beam in FSO systems.

Phase-Shift Design and Channel Modeling for Focused Beams in IRS-Assisted FSO Systems