Optical Splitter Attenuation Overview Table
Optical splitter attenuation increases with split ratio, typically adding ~3 dB per doubling of outputs, with PLC splitters generally exhibiting lower loss than FBT splitters.
Typical Insertion Loss by Split Ratio
| Split Ratio | Ideal Insertion Loss (dB) | Typical PLC Excess Loss (dB) | Typical FBT Excess Loss (dB) | Notes |
|---|---|---|---|---|
| 1×2 | 3.0 | 0.1 – 0.5 | 0.2 – 0.6 | Low-loss, suitable for minimal branching |
| 1×4 | 6.0 | 0.2 – 0.6 | 0.3 – 0.8 | Common for mid-density networks |
| 1×8 | 9.0 | 0.3 – 0.8 | 0.5 – 1.0 | Widely used in suburban/urban PON |
| 1×16 | 12.0 | 0.5 – 1.0 | 0.7 – 1.2 | Higher branching, careful power budget needed |
| 1×32 | 15.0 | 0.5 – 1.5 | 1.0 – 1.5 | High-density deployment, PLC preferred |
| 1×64 | 18.0 | 0.5 – 2.0 | 1.2 – 2.0 | Maximum branching, strict loss budget required |
Notes on the table:
- Ideal insertion loss is calculated as 10·log₁₀(N), where N is the number of output ports, representing the theoretical minimum loss without imperfections .
- Excess loss accounts for real-world factors such as fusion splices, core misalignment, and manufacturing tolerances .
- PLC splitters (Planar Lightwave Circuit) provide more uniform and lower loss, especially at higher split ratios, making them suitable for 1×32 and 1×64 deployments .
- FBT splitters (Fused Biconical Taper) are cost-effective for small splits (1×2, 1×4) but exhibit higher loss and less uniformity at larger splits .
Practical Implications
- Each doubling of the split ratio adds approximately 3 dB of optical loss, which must be considered in the PON power budget .
- Selecting the correct splitter type and ratio is critical to maintain signal quality, network reach, and service stability in FTTH and PON networks .
- For high-density networks, PLC splitters are preferred due to their low excess loss and uniformity, while FBT splitters are suitable for small-scale or cost-sensitive deployments . This table provides a practical reference for network designers to estimate attenuation and plan optical power budgets for various splitter configurations.
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