Gigabit Passive Optical Networks (GPON) is the leading technology being used in FTTx (FTTH) deployments. PON is Point to Multi-Point (P2MP) topology. From the Central Office’s Optical Line Terminal (OLT) a single strand of fiber goes out to a passive optical splitter where its signal is multiplied to different lines. The Transmit and Receive signals operate on different wavelengths allowing bi-directional operation over a single fiber.