Fiber Optic Loss Budget Calculator

Calculate total optical link loss and power budget.

Typically 3 dB for repairs and aging

Typical Component Losses

Component Typical Loss Max Loss
LC Connector0.2 dB0.3 dB
SC Connector0.25 dB0.35 dB
FC/ST Connector0.3 dB0.5 dB
Fusion Splice0.05 dB0.1 dB
Mechanical Splice0.3 dB0.5 dB
SM Fiber 1550nm0.22 dB/km0.25 dB/km
SM Fiber 1310nm0.35 dB/km0.4 dB/km

Fiber Loss Budget Planning

Power Budget Formula

Power Budget (dB) = TX Power - RX Sensitivity

Link Margin = Power Budget - Total Link Loss
Link margin should be positive for reliable operation

Best Practices

  • Always include 3 dB margin for repairs and aging
  • Use fusion splices for permanent installations
  • Minimize connector count in the path
  • Test with OTDR after installation
  • Document all splice and connector locations