Fiber Loss Budget Calculator

Calculate optical fiber link loss budgets using ITU-T G.652.D, G.657.A1/A2, and G.651.1 standards. Determine the total passive loss in your fiber optic link for system design.

Link Parameters

Fiber Type

Operating Wavelength

Cable Length (meters)

Number of Connectors

Include all connectors in the link (typically 2-4)

Number of Splices

Fusion or mechanical splices in the link

Calculation Results

Enter all parameters to calculate fiber link loss budget

ITU-T Fiber Standards & Attenuation Coefficients

ITU-T G.651.1 Multimode (50/125 μm)

• 850 nm: 3.0 dB/km

• 1300 nm: 1.0 dB/km

G.652.D Standard Single-mode (9/125 μm):

• 1310 nm: 0.35 dB/km

• 1490 nm: 0.40 dB/km

• 1550 nm: 0.20 dB/km

• 1625 nm: 0.40 dB/km

• 1650 nm: 0.40 dB/km

ITU-T G.657.A1/A2 Bend-insensitive

• 1310 nm: 0.35 dB/km

• 1490 nm: 0.40 dB/km

• 1550 nm: 0.20 dB/km

• 1625 nm: 0.40 dB/km

• 1650 nm: 0.40 dB/km

Loss Budget Formula:

Total Loss = Fiber Loss + Connector Loss + Splice Loss

This calculator uses ITU-T standard attenuation coefficients from G.651.1, G.652.D, and G.657.A1/A2 specifications. Values represent typical performance parameters. Always verify component specifications and include appropriate system margins.