The document compares two types of fiber optic splitters: FBT (fused biconical taper) and PLC (planar lightwave circuit). PLC splitters have a higher maximum split ratio of 1:64, support a wider range of wavelengths, and have a lower failure rate compared to FBT splitters, which are more cost-effective but limited to 1:32 maximum splits and three wavelengths. Overall, PLC splitters are favored for better performance, while FBT splitters may suit budget-conscious applications.

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A fiber optic splitter is an optical passive device that can split or separate an incident light beam into two
or more light beams. In terms of working principle, fiber optic splitter can be divided into FBT (fused
biconical taper) splitter and PLC (planar lightwave circuit) splitter. There are lots of differences between
PLC splitter and FBT splitter, which is confusing for many users. This article will explain the differences
between the FBT splitter and the PLC splitter.
FBT VS. PLC Splitter
A difference between the FBT splitter and the PLC splitter can be illustrated from the following
aspects.

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Splitting Ratio
The splitting ratio is decided by the inputs and outputs of a fiber optic splitter. The maximum split
ratio of the FBT splitter is up to 1:32, which means one or two inputs can be split into an output
maximum of 32 fibers at a time. While the split ratio of the PLC splitter is up to 1:64 - one or two
inputs with an output maximum of 64 fibers. Besides, the FBT splitter is customizable, and the
special types are 1:3, 1:7, 1:11, etc. But the PLC splitter is non-customizable, and it has only
standard versions like 1:2, 1:4, 1:8, 1:16, 1:32, 1:64, etc.
Operating Wavelength
FBT splitter only supports three wavelengths: 850nm, 1310nm, and 1550nm, which makes it
inability to work on other wavelengths. The PLC splitter can support wavelengths from 1260 to
1650nm, and the wavelength can be adjusted to support more applications.

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Asymmetric Attenuation Per Branch
The signal processed by the FBT splitter cannot be split evenly due to a lack of management of the
signals, so its transmission distance can be affected. PLC splitter can support equal splitter ratios
for all branches, which can ensure a more stable optical transmission.
Failure Rate
FBT splitter is used for networks requiring the splitter configuration of fewer than 4 splits. The
larger the split, the greater the failure rate. When its splitting ratio is larger than 1:8, more errors
will occur and cause a higher failure rate. Thus, the FBT splitter is more restricted to the number of
splits in one coupling. But the failure rate of the PLC splitter is much smaller than the FBT splitter.

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Temperature Dependent Loss
Temperature-dependent loss (TDL) of the splitter is affected by the manufacturing process and
the sensitivity of the device. Once the working temperature of the splitter is out of range, insertion
loss will increase and influence the performance of the splitter. FBT splitter can only work at -5 to
75 ℃ and PLC splitter can work at the temperature of -40 to 85 ℃.
Cost
Owing to the complicated manufacturing technology of a PLC splitter, its cost is higher than the
FBT splitter. If your application is simple and short of funds, the FBT splitter can provide a
cost-effective solution.
Conclusion
Overall, the PLC splitter has better performance and fewer limitations, but the FBT splitter is less
expensive to save more for the budget. Sun Telecom specializes in providing one-stop total fiber
optic solutions for all fiber optic application industries worldwide. Contact us if any needs.