A high-quality and correctly dimensioned network infrastructure is essential for all well-functional IT systems. An optical fiber-based network can ensure high speed as well as a high-quality network. To fulfill the current requirements of AERE (Atomic Energy Research Establishment), considering its smooth operation of high-speed internet service, the optical fiber-based network is the state-of- the-art network solution. An optical fiber network design refers to the specialized processes leading to a successful installation and operation of a fiber-optic network which includes determining the type of communication system(s) which will carry over the network, the geographic layout, the transmission equipment required, and the fiber network over which it will operate [1].