Standard values for a primary optical splitter

Primary optical splitters typically have standard split ratios of 1:2, 1:4, 1:8, 1:16, 1:32, and 1:64, with insertion loss increasing as the number of output ports grows.

Split Ratios

Primary optical splitters are designed to divide a single input optical signal into multiple outputs. The most common standard split ratios are:

• 1:2 – splits the signal into 2 outputs
• 1:4 – splits the signal into 4 outputs
• 1:8 – splits the signal into 8 outputs
• 1:16 – splits the signal into 16 outputs
• 1:32 – splits the signal into 32 outputs
• 1:64 – splits the signal into 64 outputs These splitters are usually uniform, meaning each output port receives an equal share of the input power, which is critical for consistent signal strength across all subscribers in a PON network .

Insertion Loss

Insertion loss (IL) is the reduction in optical power at each output port and is a key parameter for network design. Typical insertion loss values for standard splitters are:

• 1:2 splitter – ~3.5 dB
• 1:4 splitter – ~7.2 dB
• 1:8 splitter – ~10.5 dB
• 1:16 splitter – ~13.5 dB
• 1:32 splitter – ~17 dB
• 1:64 splitter – ~20 dB These values include both the splitting loss and excess loss (usually 0.1–2 dB) inherent to the splitter design . The insertion loss can vary slightly depending on the splitter type: FBT (Fused Biconical Taper) splitters are cost-effective for small splits (1:2, 1:4), while PLC (Planar Lightwave Circuit) splitters provide more uniform performance for larger splits (1:16, 1:32, 1:64), .

Operational Considerations

• Temperature range: FBT splitters typically operate from -5°C to 75°C, while PLC splitters can handle -40°C to 85°C .
• Return loss: Standard single-mode splitters have return loss values exceeding 50 dB to minimize signal reflection .
• Deployment: Primary splitters are usually installed in central offices or distribution hubs, feeding multiple secondary splitters or directly connecting to ONTs (Optical Network Terminals), .

Summary

For a primary optical splitter in FTTH or PON networks, the standard values are:

• Split ratios: 1:2, 1:4, 1:8, 1:16, 1:32, 1:64
• Insertion loss: increases with the number of outputs, typically 3.5–20 dB
• Uniform distribution: ensures equal signal strength to all outputs
• Splitter type: FBT for small splits, PLC for large splits and high uniformity These parameters are essential for designing efficient optical networks, ensuring adequate signal strength, and minimizing losses across the network .