Now Let's look at a detail diagram where we will calculate the power from OLT to ONU . and also we will see all the losses that are involved from source to destination...!
As I have already mentioned in my previous blog , we have a total 5 types of losses which are given below.
| Type Of Loss | Losses in db |
|---|---|
| Insertion Loss | -- |
| Fiber Attenuation Loss(Distance) | 0.35 db/Per Km |
| Splicing Loss | 0.2 dB |
| Connector Loss | 0.75 dB |
| Splitter Loss | You Can refer My Chart |
| Safety Margin | We will keep 2-3 dB in spare for better performance. |
Power Budget Formula Of Calculation.
Total Loss = Distance+ Splicing Loss + Splitter Loss + Safety Margin Loss + Connector Loss
ONU RX Power = Pon Module TX Power - Total Loss
Now Let's start and take an example of our diagram.
Example-1
Let's Calculate the Power.
- Total DIstance (3+5) = 8km
- Total Connector = 4
- Splitter 1:4, 1:8 & 1:2
- Total Splicing = 5
My TX Power of PON Module is = +7
Total Loss : Connector + Distance + Splitter + Splicing + Safety Margin
= Connector(4 * 0.75) + Distance (8*0.35) + Splitter (7+10.5+3.5) + Splicing(5 * 0.2) + Safety Margin (3) = 30.08 dBm
Power Budget(ONU RX Power): Pon Module TX Power - Total Loss.
= 7 - 30.8) = -23.8 dBm.
Example-2
Let's Calculate the Power.
- Total DIstance (2+6) = 8km
- Total Connector = 3
- Splitter = 1:8 & 1:16
- Total Splicing = 3
My TX Power of PON Module is = +7
Total Loss : Connector + Distance + Splitter + Splicing + Safety Margin
= Connector(3 * 0.75) + Distance (8*0.35) + Splitter (10.5+14) + Splicing(3 * 0.2) + Safety Margin ( 3 ) = 33.15 dBm
Power Budget(ONU RX Power): Pon Module TX Power - Total Loss.
= 7 - 33.15) = -26.15 dBm.
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