Optical link budget
Power budget, plant loss and margin of a fibre link, with the overload check, attenuator choice and maximum length.
Fibre-optic calculators and tools
Calculators for the everyday arithmetic of fibre links — budgets, losses, powers, channels and distances. They run in your browser, and every result comes with the formula behind it.
Fibre-optic calculators
dBm to mW converter
dBm ↔ milliwatts, a loss in dB ↔ the share of power that remains, and the total of several optical powers.
Link loss for acceptance
The loss limit of an installed link by TIA-568.3-D or design allowances at both test wavelengths, checked against your measurement.
PON power budget
ODN loss of GPON and XGS-PON with cascaded splitters: class check, spare, reach and the power at the ONU and the OLT.
DWDM and CWDM channels
Wavelength ↔ frequency, ITU-T DWDM channel numbers on the 100 and 50 GHz grid and the 18 CWDM wavelengths.
OTDR distance and latency
Round-trip time ↔ distance by group index, pulse length, index correction, OTDR range and the latency of a fibre.
More from CodingBox
Formulas and worked calculations
The arithmetic behind these calculators, with a worked example for every formula.
Typical values cheat sheet
Attenuation, loss allowances, reflectance, dispersion and the budgets of common interfaces on one page.
CodingBox web app
Read the Tx and Rx power and thresholds of a real module — the inputs of every budget.
Q&A community
Ask engineers about optics, transceivers and fibre links.