Optical Splitter Insertion Loss Table

Insertion loss of optical splitters varies by split ratio and type, with typical values ranging from 3.5 dB for 1×2 splitters to over 17 dB for 1×32 splitters, depending on FBT or PLC technology.Ove...

Optical Splitter Insertion Loss Table

Insertion loss of optical splitters varies by split ratio and type, with typical values ranging from 3.5 dB for 1×2 splitters to over 17 dB for 1×32 splitters, depending on FBT or PLC technology.

Overview

Optical splitters are passive devices used in FTTH and PON networks to divide a single optical signal into multiple outputs. Insertion loss (IL) is the reduction in optical power caused by the splitter and includes both the splitting loss and excess loss due to imperfections, splices, or misalignment . Minimizing IL is critical to maintain the power budget and ensure reliable signal transmission . Two common splitter types are:

  • FBT (Fused Biconical Taper) Splitters: Typically used for lower split ratios; insertion loss increases with higher splits.
  • PLC (Planar Lightwave Circuit) Splitters: Provide more uniform performance across higher split ratios and wider temperature ranges .

Typical Insertion Loss Values

Splitter TypeSplit RatioTypical Insertion Loss (dB)
FBT1×23.5 – 4.0
FBT1×47.0 – 7.5
FBT1×810.5 – 11.0
FBT1×1614.0 – 14.5
FBT1×3217.0 – 18.0
PLC1×23.5 – 4.0
PLC1×47.0 – 7.2
PLC1×810.5 – 11.0
PLC1×1613.5 – 14.0
PLC1×3216.5 – 17.0

These values include typical excess loss, which ranges from 0.1 to 2 dB depending on manufacturing quality and environmental conditions . The actual IL may be slightly higher when considering connectors or adapters in the network .

Key Considerations

  • Power Budget: Ensure the total insertion loss across all splitters and fiber links does not exceed the system's optical budget.
  • Temperature Stability: PLC splitters generally maintain stable IL over a wider temperature range (-40 to 85°C) compared to FBT (-5 to 75°C), .
  • Split Ratio Selection: Higher split ratios increase IL, so careful planning is required to maintain adequate signal strength at each output port .
  • Testing: Insertion loss should be measured according to GR-1209 CORE specifications to ensure compliance and network reliability . This table and guidelines provide a practical reference for designing and deploying optical networks with minimal signal degradation.
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