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Why Fiber Optic Splitter Loss Table is Important

Why Fiber Optic Splitter Loss Table is Important?

Fiber Optical Splitters
Fiber splitters, known as fiber couplers, they are common passive optical devices. They cover FBT couplers and PLC splitters that can split the optical signal into several parts at a certain ratio. For instance, a pon splitter with one input and two outputs is 1X2 fiber coupler. Likewise, there are 1X4 splitter, 1X8 splitter, 1X16 splitter, 1X32 splitter, and so on. If some splitters have two inputs and multiple outputs, they are named 2XN fiber couplers. Optical coupler plays an important role in passive optical networks (GPON, EPON, FTTH,etc) by allowing a single PON network interface to share among many customers.

Optical insertion loss
The optical fiber splitter is the component with the largest attenuation in a PON system. The optical insertion loss is the loss of an optical signal resulting from the insertion of the component such as connector or splice in an optical fiber system. In order to conserve the power budget of a PON system, It is necessary to minimize the insertion loss from the splitter.

All in all, Insertion loss testing is very important to ensure compliance with the optical parameters of the manufactured splitter under the GR-1209-CORE specification. Here is a table of typical loss for fiber coupler. Signal loss within a system is expressed using the decibel (dB) which is a measure of signal power attenuation.

When you get the fiber splitter, the primary important thing is to check its fiber optic splitter loss table.

How to calculate the maximum allowable insertion?
The maximum allowable insertion loss for an optical splitter used in a PON system can be determined by using the calculations outlined in the below:

The maximum allowable insertion loss
1×N Optical Splitter    0.8 + 3.4 log2N
2×N Optical Splitter    1.0 + 3.4 log2N
 Note: ‘N’ denotes the number of output ports.

Fiber Optic Splitter Loss Table Chart For FTB and PLC Type:

FBT Splitter
Port Count Min Loss(dB) Average Loss(dB) Max Loss(dB)
2 3.40  3.63  3.90 
4 6.70  7.22  7.70 
8 10.00  10.72  11.40 
16 13.00  13.95  14.50 
32 16.50  17.30  18.30 
64 19.67  20.78  21.84 
128 22.92  24.19  25.40 


PLC Splitter
Port Count Min Loss(dB) Average Loss(dB) Max Loss(dB)
2 3.40  3.78  4.50 
4 6.40  7.30  8.00 
8 9.70  10.75  11.60 
16 12.90  14.03  14.70 
32 16.20  17.33  18.50 
64 20.50  21.50  22.00 
128 22.77  24.65  25.43