Where is the PON of the optical splitter

In a PON network, the optical splitter is located in the optical distribution network (ODN), either at a central office or in field closures/pedestals, depending on whether the deployment is centralized or distributed.

Centralized Splitter Placement

In a centralized architecture, the optical splitter is typically installed close to the Optical Line Terminal (OLT), often within the central office or a nearby cabinet. A single fiber runs from the OLT to the splitter, which then distributes the optical signal to multiple Optical Network Terminals (ONTs) at customer premises. This setup allows for easy reconfiguration of customer connections using fiber jumpers and is ideal for high-density areas where flexibility and centralized management are priorities .

Distributed Splitter Placement

In a distributed or cascaded architecture, splitters are placed further out in the outside plant, such as in street-side closures, pedestals, or cabinets. Here, the first-stage splitter may connect to additional splitters before reaching the ONTs. This approach reduces the number of fibers running from the central office and can optimize deployment costs, but the customer-to-splitter assignments are generally fixed and not easily reconfigurable .

Summary

• Centralized splitters: Located near the OLT in the central office or cabinet; flexible and reconfigurable.
• Distributed splitters: Located in the field (closures or pedestals); fixed assignments, cost-efficient for long-distance or dispersed networks. Optical splitters are passive devices that do not require power and are essential for enabling a single OLT port to serve multiple end users efficiently, supporting split ratios such as 1:32 or 1:64 depending on network design .