  In this paper, we propose the use of two Passive Optical Network (PON)-based
network architectures to connect free-space Optical Wireless Communication
(OWC) Access Points (APs) within a room with multiple users. We optimize
through a Mixed Linear Integer Programming (MILP) model the assignment of
mobile OWC users to more than one AP to improve the resilience of the fronthaul
network, i.e the OWC system and the wired network linked to APs, and study the
impact of users distribution and channel characteristics.
