A typical split ratio in a PON application is 1:32, meaning one incoming fiber split into 32 outputs. And the qualified fiber optic signal can be transmitted over 20 km. They are. In the backbone of modern Fiber-to-the-Home (FTTH) networks, optical splitters serve as the unsung heroes that enable cost-efficient connectivity for millions of subscribers. A deeper understanding of these. Rarely, there can be two inputs to provide potential redundancy of route. In most cases, the power out of each leg. Split Ratio Design: Balancing Cost, Reach & Quality The split ratio (for example, 1:32, 1:64) determines how many subscribers share an OLT (Optical Line Terminal) port and has a direct impact on optical budget, signal strength, and future growth.