The Optical Line Terminal (OLT) is an aggregation device located at the Central Office (CO) for terminating the PON protocol.Optical Network Units (ONUs)/Optical Network Terminal (ONTs) are located on the user side, providing various types of ports to connect user terminals. The OLT and ONUs are connected through a passive ODN for communication. The Optical Distribution Network (ODN) is composed of passive optical components (POS) such as optical fibers, and one or more passive optical splitters. The ODN provides optical channels between the OLT and ONUs. It interconnects the OLT and ONUs and is highly reliable. The ODN is passive, which means that no optical amplifier or regenerator will be deployed on the ODN, reducing the maintenance costs of outdoor devices