Fiber Optic Link Loss Budget

Enter your fiber run and transceiver specs. Get the calculated optical loss against your available power budget, so you know if a link will actually work before you pull cable.

Fiber Run

Fiber Type

Attenuation (dB/km)

Fiber Length (km)

Connectors (count)

Loss per Connector (dB)

Safety Margin (dB)

Fusion Splices (count, ~0.1 dB each)

Loss per Splice (dB)

Transceiver Power Budget

Tx Launch Power (dBm, min guaranteed)

Rx Sensitivity (dBm, worst case)

Use the min Tx power and worst-case Rx sensitivity from your transceiver's datasheet, not typical values. Defaults shown approximate a 1000BASE-LX SFP.

Fiber Attenuation-

Connector Loss-

Splice Loss-

Safety Margin-

Total Calculated Loss-

Available Power Budget (Tx − Rx)-

Remaining Margin-