Optical power budget

Optical power budget

FTTx Optical Power budget

  • Fiber attenuation
  • Splice loss
  • Connector (Adapter) quantity
  • Splitter
  • Length of fiber
Name   Avg. Loss (db)
Splice loss 0.1
Connector loss Adapter 0.2
Cable (Commonly G.625) 1310nm 0.36/Km
1490nm 0.25/Km
ODF Connector Loss Each 0.35
Quick Connection Connector 0.4
Splitter 1:2 3.5
1:4 7
1:8 10.5
1:16 14
1:32 17

What is “Optical power budget”?

The optical power budget in a fiber-optic communication link is the allocation of available optical power (launched into a given fiber by a given source) among various loss-producing mechanisms such as launch coupling loss, fiber attenuation, splice losses, and connector losses, in order to ensure that adequate signal strength (optical power) is available at the receiver.

FTTx optical total loss

In optical power budget attenuation is specified in decibels (dB) and optical power in dBms.

Splice loss

In addition to transmission loss, including those of any splices and connectors, allowance should be made for at least several dB of optical power margin losses, to compensate for component aging and to allow for future splices in the event of a severed cable.

Connectors and Splices loss

Length of fiber (Transmission Distance):

  1. FTTH PON can support a transmitting distance of about 20 Km under a 1:32 splitting ratio, and about 10 km under a 1:64 splitting ratio.
  2. The length of fiber mainly depends on the optical loss. The higher the optical loss is, the shorter the transmitting distance will be.
  3. If fiber transmission distance is more than 2 Km, fiber splicing should be considered, or combined with other technology.


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