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As an affordable alternative solution for the broadband first/last mile access, optical wireless communication (OWC) has recently attracted attention from the literature. Among the primary advantages of OWC system are the high data rate, unlicensed spectrum of operation, quick and inexpensive setup. However, the link and bandwidth availability due to interferences from weather or others remain as challenge for designing a robust and high- performance OWC network. In this paper, we propose new approaches based on mixed Integer Programming formulations to model and optimize OWC topology design while taking into the link and bandwidth availability, and partial bandwidth allocation into consideration. Our analysis and results provide valuable insights into designing robust and reconfigurable OWC network.