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):
- 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.
- The length of fiber mainly depends on the optical loss. The higher the optical loss is, the shorter the transmitting distance will be.
- If fiber transmission distance is more than 2 Km, fiber splicing should be considered, or combined with other technology.
