Splice Loss Calculator

Calculate expected fiber splice loss from alignment parameters, fiber type, and splice method. Compare fusion vs mechanical splice losses.

Splice Method

Fiber Type

Lateral Core Offset

μm

Angular Offset

End Separation

μm

Number of Splices

Tab to move between fields

Calculated Loss per Splice

0.181 dB

Total (All Splices)

1.81 dB

Lateral Offset Loss0.04 dB

Angular Offset Loss0.111 dB

End Separation Loss0.03 dB

Typical for Method0.05 dB

Worst Case0.1 dB

Typical Total0.5 dB

Worst-Case Total1 dB

Na0.12

How to Use This Calculator

Select Splice Method (Fusion or Mechanical) — fusion splices are typically lower loss (0.02–0.1 dB) than mechanical (0.1–0.5 dB).
Choose Fiber Type (single-mode or multimode) to set the baseline splice loss model.
Enter Lateral Core Offset (μm), Angular Offset (°), and End Separation (μm) from your splice alignment unit display.
Enter Number of Splices to calculate total link splice loss.
Review Calculated Loss per Splice, Worst Case, Total (All Splices), and Typical Total — verify all values are within your loss budget.

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Formula

Loss ≈ 4.343 × (offset/MFD)² + angular + Fresnel losses

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