The main difference is the output optical power which we called as TX Power of module . Class C++ GPON SFP module output optical power is about 7dBm, the Class C+ GPON SFP module output optical power is about 5dBm. Of course, their optical receiver sensitivity is also different. The Class C++ optical receiver sensitivity is best.
Showing posts with label GPON. Show all posts
Showing posts with label GPON. Show all posts
Thursday, 18 April 2024
GPON FTTH Network Architecture..!
I will show you how you can design the FTTH network in the best way which will help you to expand your network in a better way and also it will help you to manage the power appropriately.
In GPON , We can extend our network to 20km and we can give 128 customers on per PON port.
As we know, In FTTH the most important thing is to calculate your power budget from OLT to ONU because optical power is the main component of GPON network architecture. Let's see..
There is a 2 way of splitting and designing the FTTH network.
- Two-way Splitting.
- Three-way Splitting.
Two-way Splitting Design.
in 2 ways, There are 3 types is splitting.
- 1:4 <==========> 1:32
- 1:8 <==========> 1:16
- 1:2 <==========> 1:64
Three-way Splitting Design.
in 3 ways, There are 4 types is splitting.
- 1:2 <==========> 1:2 <==========> 1:32
- 1:4 <==========> 1:4 <==========> 1:8
- 1:4 <==========> 1:16 <==========> 1:2
- 1:2 <==========> 1:8 <==========> 1:8
EPON FTTH Network Architecture..!
I will show you how you can design the FTTH network in the best way which will help you to expand your network in a better way and also it will help you to manage the power appropriately.
In EPON , We can extend our network to 20km and we can give 64 customers on per PON port.
As we know, In FTTH the most important thing is to calculate your power budget from OLT to ONU because optical power is the main component of EPON network architecture. Let's see..
There is a 2 way of splitting and designing the FTTH network.
- Two-way Splitting.
- Three-way Splitting.
Two-way Splitting Design.
in 2 ways, There are 3 types is splitting.
- 1:8 <==========> 1:8
- 1:4 <==========> 1:16
- 1:2 <==========> 1:32
Three-way Splitting Design.
in 3 ways, There are 3 types is splitting.
- 1:2 <==========> 1:2 <==========> 1:16
- 1:4 <==========> 1:4 <==========> 1:4
- 1:4 <==========> 1:8 <==========> 1:2
PON Power Budget Calculation...!
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.
Types of Losses Involved in Gpon/Gepon Networks...!!
A total of 5 types of losses are involved from OLT to ONU so find the details chart given below.
| Type Of Loss | Losses in db |
|---|---|
| Insertion Loss | Less than 1 dBm |
| Fiber Attenuation Loss(Length Of Fiber) | 0.35 db/Per Km |
| Splicing Loss | 0.2 dB |
| Connector Loss | 0.75 dB |
| Splitter Loss | You Can refer My Chart |
Ratio Coupler Insertion Loss Chart..!
The chart given below shows the general attenuation loss for common ratio Couplers in FTTH.
| Type Of Coupler | Split Ratio | Insertion Loss |
|---|---|---|
| 1x2 | 50:50 | 3.2/3.2 |
| 1x2 | 45:55 | 3.7/2.8 |
| 1x2 | 40:60 | 4.2/2.4 |
| 1x2 | 35:65 | 4.8/2.1 |
| 1x2 | 30:70 | 5.4/1.8 |
| 1x2 | 25:75 | 6.2/1.5 |
| 1x2 | 15:85 | 8.4/0.91 |
| 1x2 | 10:90 | 10/0.66 |
| 1x2 | 5:95 | 13/0.42 |
| 1x2 | 2:98 | 17/0.29 |
| 1x2 | 1:99 | 20/0.24 |
| 1x3 | 10:45:45 | 10/3.7/3.7 |
| 1x3 | 20:40:40 | 7.2/4.2/4.2 |
| 1x3 | 20:40:40 | 7.2/4.2/4.2 |
| 1x3 | 30:35:35 | 5.4/4.8/4.8 |
| 1x3 | 40:30:30 | 4.2/5.4/5.4 |
| 1x3 | 50:25:25 | 3.2/6.2/6.2 |
| 1x3 | 60:20:20 | 2.4/7.2/7.2 |
| 1x3 | 70:15:15 | 1.8/8.4/8.4 |
| 1x3 | 80:10:10 | 1.2/10/10 |
| 1x4 | 25:25:25:25 | 6.2/6.2/6.2/6.2 |
GPON/GEPON Splitter Loss CHart..!!!
The chart given below shows the general attenuation loss for common splitter ratios in FTTH.
| Splitter Type | Insertion Loss in db |
|---|---|
| 1:2 | -3.01dB |
| 1:4 | -6.02dB |
| 1:8 | -9.03dB |
| 1:16 | -12.04dB |
| 1:32 | -15.05dB |
| 1:64 | -18.06dB |
| 1:128 | -24.06dB |
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