Number of optical splitters connected

The number of optical splitters connected depends on the PON split ratio, network architecture, and the number of ONUs served per OLT port.Split Ratios and ConnectionsIn a PON network, a single OLT port can connect to multiple ONUs through optical splitters. The split ratio defines how many ONUs are served by one OLT port. For example, a 1:32 split ratio means one OLT port connects to 32 ONUs, while a 1:64 split ratio connects to 64 ONUs . EPON networks typically use up to 1:64, whereas GPON networks can theoretically support up to 1:128, though 1:64 is commonly used for practical performance reasons .Types of SplittersTwo main types of optical splitters are used:FBT (Fused Biconical Taper) splitters: Cost-effective, suitable for small splits like 1:2 or 1:4 .PLC (Planar Lightwave Circuit) splitters: Provide uniform signal distribution, ideal for larger splits such as 1:32 or 1:64 . The choice of splitter affects the number of outputs and the optical power available to each ONU.Network Architecture ConsiderationsSplitters can be deployed in centralized or distributed architectures:Centralized splitting: Multiple splitters are located at a central office or cabinet, allowing flexible assignment of ONUs via jumpers .Distributed splitting: Splitters are placed closer to subscribers in closures or pedestals, with fixed connections that are not reconfigurable . The architecture determines how many splitters are physically connected in the network. For example, a centralized 1:64 split may use one PLC splitter per OLT port, while a distributed 1:16 + 1:4 configuration may use two splitters in series to achieve the same total number of ONUs.Practical ExampleIf an OLT port is designed to serve 64 ONUs:Using a single 1:64 PLC splitter, only one splitter is connected per port.Using a distributed approach with a 1:8 splitter at the central office and a 1:8 splitter near the subscriber, two splitters are connected in series to achieve the 1:64 total split ratio . The total number of splitters in a network depends on the number of OLT ports, the chosen split ratios, and whether centralized or distributed splitting is used.SummaryThe number of optical splitters connected is not fixed; it varies based on:The split ratio (1:N) chosen for each OLT port.The type of splitter (FBT or PLC) and its output capacity.The network architecture (centralized vs distributed). Understanding these factors allows network planners to optimize cost, bandwidth, and scalability while ensuring reliable service to all connected ONUs .