  Despite the promising gains, free-space optical (FSO) communication is
severely influenced by atmospheric turbulence and pointing error issues, which
make its practical design a bit challenging. In this paper, with the aim to
increase the communication coverage and improve the system performance,
reconfigurable intelligent surfaces (RISs) are considered in an FSO
communication setup, in which both atmospheric turbulence and pointing errors
are considered. Closed-form expressions for the outage probability, average bit
error rate, and channel capacity are derived assuming large number of
reflecting elements at the RIS. Specifically, according to central limit
theorem (CLT), while assuming multiple reflecting elements approximate
expressions are proposed. It is shown that the respective accuracies increase
as the number of elements at the RIS increases. Illustrative numerical examples
are shown along with insightful discussions. Finally, Monte Carlo simulations
are presented to verify the correctness of the analytical results.
