1:2
Loss
3.8 dB
Use
Small branch / two-stage first split
Note
Useful for cascaded designs.
FTTH / PON Engineering Tool
FTTH / PON Splitter Loss Calculator
Estimate PON ODN splitter loss, received power and reserve margin. Check single-stage or two-stage PLC splitter planning for GPON, XGS-PON, EPON and FTTH links.
Use this calculator for PON/ODN power budget screening. It checks one optical direction at a time. Downstream and upstream may need separate checks when wavelength, optical class, transmit power or receiver sensitivity differs.
Calculator Input
Input PON Link Parameters
Preset fills practical planning values. Replace them with project OLT/ONU datasheet values when available.
For conservative PON RFQ planning, 1310 nm is usually safer than downstream-only attenuation.
Unit: dB/km.
Unit: dBm.
Unit: dBm, normally negative.
If received power is higher than this value, short-link overload risk is shown.
Unit: dB.
Use for designs such as 1:4 × 1:8 or 1:8 × 1:8.
Unit: dB.
Unit: km, OLT to splitter area.
Unit: km, splitter/FAT to ONU/ONT.
Include ODF, FAT, patch panel, adapter and ONU interface points.
Typical planning value: 0.20-0.50 dB per mated pair.
Reserve for aging, bending, repair and field variation.
Use for WDM, old cable, extra patching or field uncertainty.
Topology
PON Link Topology
OLTTransmit power source in central office or equipment room.
Feeder CableBackbone fiber from OLT/ODF to closure or splitter point.
PLC SplitterSingle-stage or two-stage optical power distribution.
Drop Cable / FATAccess terminal, drop section, adapters and field splices.
ONU / ONTReceiver sensitivity and overload range define power window.
Reference
Typical PLC Splitter Loss Reference
1:4
Loss
7.4 dB
Use
Distribution point
Note
Often paired with 1:8 or 1:16.
1:8
Loss
10.7 dB
Use
FAT / floor box
Note
Good balance between coverage and budget.
1:16
Loss
13.9 dB
Use
Neighborhood distribution
Note
Check connector and splice count carefully.
1:32
Loss
17.2 dB
Use
Common GPON FTTH split
Note
Usually feasible with proper ODN design.
1:64
Loss
20.8 dB
Use
High-density FTTH split
Note
Can be single-stage or 1:8 × 1:8.
1:128
Loss
24.2 dB
Use
Very high split design
Note
Requires strict power budget verification.
RFQ Output
RFQ Checklist for PON ODN
Copy this structured checklist to document FTTH drop cable, PLC splitter, FAT, ODF, patch cord, pigtail and adapter requirements.
Copy-ready PON ODN checklist The checklist updates automatically after each calculation and keeps the core engineering information in one place.
RFQ Draft 1. Optical budgetPON class, wavelength, Tx power, sensitivity and overload level.
2. ODN routeFeeder length, drop length, connector pairs, splices and reserve.
3. Splitter designSingle-stage or two-stage PLC splitter ratio and insertion loss.
4. ProductsDrop cable, PLC splitter, FAT, ODF, patch cord, pigtail and adapter.
RFQ checklist updates after calculation.
Result Guide
How to Read the Result
Pass
Condition
Margin after reserve ≥ 0 dB
Meaning
The selected ODN design keeps the reserve margin.
Action
Confirm actual OLT/ONU optical class, splitter datasheet and field test requirements.
Warning
Condition
Raw budget is positive, but reserve is consumed or overload risk exists.
Meaning
The link may register, but field variation can create risk.
Action
Reduce split ratio, shorten route, reduce connectors or use higher optical class.
Fail
Condition
Passive loss exceeds available optical budget.
Meaning
The estimated received power is below receiver sensitivity.
Action
Revise split ratio, route length, connector count or optical class before deployment planning.
