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Optical fiber

Fiber Loss Budget

Calculate the optical power budget of your fiber link: add up the loss from distance, connectors and splices and compare it with the available power (Tx − Rx) to find the real margin in dB. All the calculation happens in your browser.

Fills in the typical attenuation; you can edit it below.

Typical 0.3 dB · TIA max 0.75 dB.

Fills in Tx and Rx; you can adjust them by hand.

Recommended to leave ≥ 3 dB of headroom for aging and repairs.

redzilla.cl — loss-budget 
 
  
 
 Link margin — 
 
 
 
 
  
 
 
Total loss
 
—
 
full link
 
 
 
Budget
 
—
 
Tx − Rx available
 
 
 
Margin
 
—
 
budget − loss
 
 
 
Max. distance
 
—
 
with this safety margin
 
 
  
 
Loss breakdown
 
 
  
ComponentDetailLoss (dB)
   
 
 
 
 How it is calculated 
 
 Link loss = distance (km) × attenuation (dB/km)
            + connectors × loss per connector + splices × loss per splice.

 
 Power budget = Tx power (dBm) − Rx sensitivity (dBm).

Margin = Budget − Link loss.

 

The margin must be > 0 for the link to work. It is recommended
            to leave ≥ 3 dB of headroom. The maximum distance distributes the
            remaining budget (after subtracting connectors, splices and safety margin) across the fiber attenuation.

 
 
 
 
 
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