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In this work, we consider the performance analysis of the uplink cellularnetworks with free space optics (FSO) backhauling. The user equipment (UE)communicates with the nearest Base Station (BS) in first slot while in secondslot, the BS converts the received radio frequency (RF) signal into FSO pulseand transmits to the data center. We adopt the Rayleigh fading for the uplinkchannels while the FSO backhaul encompasses the turbulence-induced fading whichfollows the M\'alaga distribution, the weather pathloss, and the pointingerrors fading which is distributed following the generalized Beckmann model.Further, we will compare the performances when the BS behaves as either adecode-and-forward (DF) relay or an intelligent reflecting surface (IRS). Next,we will propose an optimal design of the phase shifters of the IRS to minimizethe interference and improve the rate to beat relaying. Capitalizing on thisframework, we will derive the system performance metrics such as the coverageprobability as well as the spectral efficiency. Focusing on high SNR, we willobtain the diversity gain to get engineering insights into the systemperformance and limitations. Finally, the analytical results are confirmed byMonte Carlo simulations.

Stochastic Geometry Analysis of Uplink Cellular Networks with FSO Backhauling: Cooperative Relaying Vs. Reflecting Surfaces