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sci.optical-fiber-attenuation Calculator
Calculates optical fibre signal attenuation A(dB) = α × L from loss coefficient and fibre length, and maximum span length before amplification. SMF-28 at 1,550 nm: α = 0.18 dB/km — EDFA amplifiers spaced every 80 km maintain signal over transoceanic cables of 10,000+ km.
Inputs
P In Mw
Rate of energy transfer (W). P = V×I (electrical). P = F×v (mechanical). 1 horsepower ≈ 746 W.
P Out Mw
Rate of energy transfer (W). P = V×I (electrical). P = F×v (mechanical). 1 horsepower ≈ 746 W.
Length Km
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Results
total attenuation (dB)
The combined total across all inputs and components.
attenuation coefficient α (dB/km)
The value at the specified point or condition.
max reach at 30 dB budget (km)
The value at the specified point or condition.
α = (10/L)·log₁₀(P_in/P_out)
Sample size or count used in the calculation.
SM fiber at 1310 nm
The value at the specified point or condition.
classification
Category assigned based on where the computed value falls on a defined scale. Check which standard or guideline defines these boundaries.