How to use the fiber optic power loss calculator
Find the output power of an optical fibre after attenuation over its length. Enter input power, attenuation, fiber length in the fields above; the output power, power lost are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “fiber optic loss”, “optical fibre power budget”, “attenuation in dB per km”, “calculate fiber optic power loss”, “find output power”.
Formula
Variables
- Pin — Input power (mW)
- al — Attenuation (dB/km)
- L — Fiber length (km)
Worked example
With input power = 1 mW, attenuation = 0.2 dB/km, fiber length = 50 km, the calculator gives output power ≈ 100 µW; power lost ≈ 10 dB.
Frequently asked questions
What is the fiber optic power loss calculator used for?
Find the output power of an optical fibre after attenuation over its length. It helps with questions such as “fiber optic loss”, “optical fibre power budget”, “attenuation in dB per km”.
What is the formula for the fiber optic power loss calculation?
Output power (µW) = Pin × 1000 × 10^(-al × L / 10). Power lost (dB) = al × L. Here Pin is input power (mW), al is attenuation (dB/km), L is fiber length (km).
What inputs do I need for the fiber optic power loss calculator?
You need input power in mW, attenuation in dB/km, fiber length in km. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the fiber optic power loss calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the fiber optic power loss result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.