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What is FBT Splitter

FBT Splitter Production Process

The fusion taper method is to bring two or more optical fibres without coating layer together in a certain way. Then the optical fiber is melted under heat and stretched to both sides at the same time, forming a unique waveguide structure in the form of a double cone in the heating area.

By controlling the angle of fiber twisting and the length of stretching, the change of beam splitting ratio is monitored in real-time. After the beam splitting ratio reaches the requirement, the melt stretching is ended and different beam splitting ratios can be obtained.


FBT Splitter Feature 1: The split ratio of FBT Splitter is optional. FBT Splitter can be monitored in real time as needed and can make unequal splitters.

Keep a fiber at one end as input, cut the rest, and the other end as multiplexed output. Finally, the pull cone area is cured on the quartz substrate with curing adhesive, and inserted into the stainless steel tube, which is the optical splitter.

The thermal expansion of this production process is inconsistent with the quartz substrate and stainless steel tube. When the ambient temperature changes, the degree of thermal expansion and contraction is inconsistent, which can easily lead to damage to the optical splitter, especially in the case of optical splitting in the field.

FBT Splitter Feature 2: This production process results in a small operating temperature range of FBT Splitter, generally in -5~75℃. Temperature is the key factor affecting the insertion loss of optical devices, so FBT Splitter is more prone to High temperature dependent loss (TDL) compared to FLC Splitter.

The mature cone pulling process can only pull below 1×4 at a time. In FTTH projects, low split optical splitters (below 1×4) are often used to pull cone technology devices at a time. The laboratory has records of 1×8, but the mass production process is not yet mature. 1×4 or more devices are connected together with multiple 1×2. The whole is then packaged in a splitter box.

FBT Splitter Feature 3: When the splitting ratio is greater than 1:8, the FBT optical splitter requires more than seven 1×2 connection packages, which are prone to errors and cause failures. In other words, the larger the splitting ratio of FBT optical splitter, the greater the failure rate.

At last, the pull cone area is cured on the quartz substrate with curing adhesive and inserted into the stainless copper tube, which is the FBT Splitter.

FBT fused cone pulling method is the most mature and convenient method to make optical splitter. This optical splitter has higher optical index, stable and reliable performance, and has been universally recognized after years of application.

FBT Splitter Advantages

  • FBT Splitter production process is relatively simple, has better performance, and is widely used in CATV systems.
  • The raw materials used in FBT Splitter are less costly and the product cost is low. Longer development history and low development cost.
  • FBT Splitter is suitable for the case of a few taps

FBT Splitter supports only three wavelengths: 850nm, 1310nm and 1550nm, which makes it impossible to work on other wavelengths.

The uniformity of FBT Splitter is poor, the maximum difference of 1X4 FBT Splitter is about 1.5dB, and the difference is even greater above 1×8. The transmission distance will be affected because the exact equal ratio cannot be guaranteed.

FBT Splitter Application

  • FTTH, LAN, PON & Optical CATV
  • Local ring net, Optical fiber communication system
  • Optical fiber test equipment, Optical fiber sensor

FBT Optical Splitter Fabrication Process

The fabrication of FBT optical splitters is generally divided into four steps.

  1. Melt pulling cone – making lx2 splitter basic unit on FBT melt pulling cone system.
  1. Unit encapsulation – encapsulation with special encapsulation materials to protect the coupling area of the splitter.
  2. fusion – according to the design requirements, the combination of lx2 splitter units fused into lxN optical splitter.
  3. Finished product packaging – modular packaging of 1xN optical splitters

Common FBT Splitter Types

1×2 Singlemode ABS Box FBT Splitter


1X2 Multimode ABS Box FBT Splitter


1×2 Loose Tube Dual Window FBT Splitter


1×3 Single Mode Steel Tube FBT Splitter


1×3 Single Mode FBT Splitter


1×4 Single Mode Dual Window Steel Tube FBT Splitter


1×4 Single Mode Dual Window ABS Box FBT Splitter


A fiber optic splitter can be produced with Singlemode, Multimode 62.5, and Multimode 50 Fiber. also you can customise them with LC, LC/APC, SC, SC/APC, FC, FC/APC, and ST connectors or unconnectorized.

When it comes to 1*2 Fiber Splitters, You can also request details for different splitting ratio, such as 50/50, 40/60, 30/70, 20/80, 10/90, 5/95, 1/99, 60/40, 70/30, 80/20, 90/10, 95/5, and 99/1.

Most optical Splitters are available in 900µm loose tube and 250µm bare fiber. 1×2 and 2×2 couplers come standard with a protective metal sleeve to cover the split. Higher output counts are built with a box to protect the splitting components.

Stephen Xie

Stephen Xie

Hello, I'm Stephen Xie, a sales representative at Hello Signal. I specialize in Passive Optical Components and Cabinet & Racks. I can recommend the most suitable products at competitive prices, ensuring worry-free service. Feel free to contact me with any questions.


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