What’s the differences between FBT Splitter and PLC Splitter?

In FTTx and PON architectures, optical spliter plays an increasingly significant role to create a variety ofpoint-to-multipoint filber optic networks. But do you know what is a fiber optic splitter? in fact, a fiber opticspliter is a passive optical device that can split  or separate an incident light beam into two or more lightbeams. Basically, there are two types of fiber splitter classified by their working principle: fused biconicaltaper splitter (FBT splitter) and planar lightwave circuit splitter (PLC splitter). You may have one question :what's the difference between them and shall we use FBT or PLC splitter?

What is FBT Splitter?

FBT splitter is based on traditional technology, involving the fusion of several fibers from the side of each fiber. The fibers are aligned by heating them at a specific location and length. Due to the fragility of the fused fibers, they are protected by a glass tube made of epoxy and silica powder. Subsequently, a stainless steel tube covers the inner glass tube and is sealed with silicon. As technology continues to develop, the quality of FBT splitters has significantly improved, making them a cost-effective solution. The following table outlines the advantages and disadvantages of FBT splitters.

Advantages	Disadvantages
Cost-Effective	Higher Insertion Loss
Generally less expensive to manufacture	Can affect overall system performance
Compact Size	Wavelength Dependency
Easier installation in tight spaces	Performance may vary across wavelengths
Simplicity	Limited Scalability
Straightforward manufacturing process	More challenging to scale for many outputs
Flexibility in Splitting Ratios	Less Reliable Performance
Can be designed for various ratios	May not provide consistent performance
Good Performance for Short Distances	Temperature Sensitivity
Effective in short-distance applications	Performance can be affected by temperature fluctuations

 

What is PLC Splitter?

PLC splitter is based on planar lightwave circuit technology. It comprises three layers: a substrate, a waveguide, and a lid. The waveguide plays a key role in the splitting process which allows for passing specific percentages of light. So the signal can be split equally. In addition, PLC splitters are available in a variety of split ratios, including 1:4, 1:8, 1:16, 1:32, 1:64, etc. They also have several types, such as bare PLC splitter, blockless PLC splitter, fanout PLC splitter, mini plug-in type PLC splitter, etc. You also can check the article How Much Do You Know About PLC Splitter? for more information about PLC splitter. The following table shows the advantages and disadvantages of PLC splitter.

Advantages	Disadvantages
Low Insertion Loss	Higher Cost
Typically offers lower signal loss	Generally more expensive to manufacture
Broad Wavelength Performance	Larger Size
Performs consistently across multiple wavelengths	Usually bulkier than FBT splitters
High Reliability	Complex Manufacturing Process
Provides consistent performance over long distances	More complex to produce compared to FBT splitters
Flexible Splitting Ratios	Initial Setup Complexity
Available in various configurations (e.g., 1xN)	May require more careful installation and configuration
Temperature Stability	Potential Fragility
Better performance across temperature variations	More sensitive to physical damage

 

FBT Splitter vs PLC Splitter: What Are the Differences?

1. Operating Wavelength

FBT splitter only supports three wavelengths: 850nm, 1310nm, and 1550nm, which makes its inability to work on other wavelengths. The PLC splitter can support wavelengths from 1260 to 1650nm. The adjustable range of wavelength makes PLC splitter suitable for more applications.

2. Splitting Ratio

Splitting ratio is decided by the inputs and outputs of an optical cable splitter. The maximum split ratio of 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. However, the split ratio of PLC splitter is up to 1:64 - one or two inputs with an output maximum of 64 fibers. Besides, FBT splitter is customizable, and the special types are 1:3, 1:7, 1:11, etc. But PLC splitter is non-customizable, and it has only standard versions like 1:2, 1:4, 1:8, 1:16, 1:32, and so on.

3. Splitting Uniformity

The signal processed by FBT splitters cannot be split evenly due to a lack of management of the signals, so its transmission distance can be affected. However, PLC splitter can support equal splitter ratios for all branches, which can ensure a more stable optical transmission.

4. Failure Rate

FBT splitter is typically used for networks requiring the splitter configuration of less 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, FBT splitter is more restricted to the number of splits in one coupling. But the failure rate of PLC splitter is much smaller.

5. Temperature-Dependent Loss

In certain areas, the temperature can be a crucial factor that affects the insertion loss of optical components. FBT splitter can work stable under the temperature of -5 to 75℃. PLC splitter can work at a wider temperature range of -40 to 85 ℃, providing relatively good performance in the areas of extreme climate.

6. Price

Owing to the complicated manufacturing technology of PLC splitter, its cost is generally higher than the FBT splitter. If your application is simple and short of funds, FBT splitter can provides a cost-effective solution. Nevertheless, the price gap between the two splitter types is narrowing as the demand for PLC splitters continues to rise.

7. Size

FBT splitters typically have a larger and bulkier design compared to PLC splitters. They demand more space and are better suited for applications where size is not a limiting factor. PLC splitters boast a compact form factor, making them easily integrable into small packages. They excel in applications with limited space, including inside patch panels or optical network terminals.