Optical Splitter Settings

Optical splitter settings involve selecting the appropriate split ratio, deployment architecture, and placement to optimize signal distribution and network performance.

Split Ratios

Optical splitters divide a single optical signal into multiple outputs. The split ratio determines how the input power is distributed among the outputs. Common ratios include 1x2, 1x4, 1x8, 1x16, 1x32, and 1x64, with higher splits reducing the power per output by roughly 3 dB for each doubling of the split ratio . Non-uniform splitters are also available for custom applications, though they are less common and more expensive . The choice of split ratio affects the number of subscribers served by a single OLT port and the required optical power budget.

Splitter Types

Two main types of splitters are used in PON networks:

• FBT (Fused Biconical Taper) Splitters: Cost-effective, suitable for small splits like 1:2 or 1:4, often used in residential or low-density deployments .
• PLC (Planar Lightwave Circuit) Splitters: Provide highly uniform power distribution, ideal for large splits like 1:32 or 1:64, commonly used in high-density FTTH networks .

Deployment Architectures

Optical splitters can be deployed in centralized or distributed architectures:

• Centralized Splitting: Splitters are located in a central office or cabinet, allowing flexible customer-to-splitter assignments via jumpers. This setup simplifies maintenance and subscriber management .
• Distributed Splitting: Splitters are placed closer to end-users, often in closures or pedestals. Once installed, assignments are fixed, which can reduce fiber usage but limits flexibility .

Placement Considerations

Splitters can be installed indoors or outdoors, depending on network design. Indoor locations include central computer rooms, building wiring boxes, or floor distribution points. Outdoor placements are typically in weatherproof enclosures or pedestals . Proper placement ensures minimal signal loss, easier maintenance, and efficient fiber routing.

Operational Settings

• Ensure the input power from the OLT is sufficient for the chosen split ratio.
• Verify that the optical network terminals (ONTs) receive adequate power to operate reliably.
• For networks with redundancy, some splitters may have dual inputs to provide alternative routes .
• Consider scalability: centralized PLC splitters allow adding new subscribers without major network changes .

Summary

Optimizing optical splitter settings requires balancing split ratio, splitter type, deployment architecture, and placement to achieve reliable signal distribution, cost efficiency, and network scalability. Proper configuration ensures that each ONT receives sufficient optical power while minimizing infrastructure costs and supporting future network expansion .