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Calcimator

OTDR Trace Analyzer Calculator

Analyze OTDR measurement results to identify event losses, compare against thresholds, and validate fiber link quality.

Inputs

km
dB

Results

Total Event Loss

1.5 dB

Overall Attenuation

0.5 dB/km

Loss Margin

0.9 dB

Expected Cable Loss3.5 dB
Avg Connector Loss0.525 dB
Avg Splice Loss0.112 dB
Max Acceptable Loss5.9 dB
Passed (1=Yes, 0=No)1
How to Use This Calculator
  1. Enter Fiber Length (km) and Total End-to-End Loss (dB) from the OTDR trace.
  2. Enter Total Events — the number of reflective and non-reflective events identified on the trace.
  3. Break down events into Reflective Events (connectors, mechanical splices) and Non-Reflective Events (fusion splices).
  4. Select the Test Wavelength (850, 1310, or 1550 nm) used during the OTDR test.
  5. Review Overall Attenuation (dB/km), Loss Margin (dB), and Passed (1=Yes) — if the link fails the budget, investigate high-loss events.
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Formula

Event Loss = Total Loss - (Fiber Length × dB/km)

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