What is the ratio of the ODN of the optical splitter

The ODN split ratio defines how a single optical signal is divided among multiple outputs, commonly ranging from 1:2 up to 1:64 in FTTH networks.Understanding ODN Split RatiosIn an Optical Distribution Network (ODN), splitters distribute the optical power from one feeder fiber to multiple subscribers. The split ratio indicates the number of output ports relative to the input port. For example, a 1:32 splitter divides one input signal into 32 outputs, each receiving roughly equal optical power in a balanced splitter configuration .Common Split RatiosBalanced (Uniform) Splitters: These distribute optical power evenly across all outputs. Typical ratios include 1:2, 1:4, 1:8, 1:16, 1:32, and 1:64 . Balanced splitters are standard in FTTH deployments to ensure consistent signal strength for all subscribers.Unbalanced (Asymmetrical) Splitters: These allocate different proportions of optical power to outputs, such as 10/90, 15/85, 20/80, or 30/70 for a 1:2 splitter . Unbalanced splitters are used to optimize fiber resources, reduce deployment costs, or prioritize certain subscribers with higher bandwidth needs.Deployment ConsiderationsSubscriber Density: High-density areas often use higher split ratios (1:32 or 1:64) to serve more users from a single OLT port .Optical Budget: The total loss, including splitter loss, fiber attenuation, and connectors, must remain within the PON standard (e.g., 28 dB for GPON) to ensure reliable service .Architecture: Splitters can be deployed in centralized or distributed architectures. Distributed splitting with pre-terminated access nodes is common in modern Quick ODN designs, improving manageability and reducing field splicing risks .SummaryThe ODN split ratio is a key design parameter that determines how many subscribers share a single optical signal and how the optical power is distributed. Choosing the correct ratio balances network cost, bandwidth availability, and optical loss margins. Balanced splitters are standard for uniform service, while unbalanced splitters provide flexibility for customized deployments .