FBT (Fused Biconical Taper) splitters are passive optical devices that split or combine light in fiber networks, available in 1x2, 2x2, and higher configurations with customizable coupling ratios and wide wavelength support.

Key Specifications

Configurations and Split Ratios: FBT splitters are commonly available in 1x2, 2x2, 1x4, 1x8, and 2xN configurations. Standard split ratios include 50/50, but asymmetric ratios such as 10/90, 20/80, 30/70, or 1/99 are also supported for monitoring taps, power balancing, or specialized distribution applications . Wavelength Range: Single-mode FBT splitters typically operate over 1260–1650 nm, covering standard telecom bands. Some variants are optimized for 1310 nm or 1550 nm, while wideband and dual-window types support 1260–1620 nm for WDM or broadband applications . Insertion Loss and Performance: A typical 1x2 splitter has an insertion loss around 3.5 dB, with low polarization-dependent loss (PDL < 0.2 dB) and high return loss (>50 dB), ensuring minimal signal degradation . Packaging: FBT splitters are housed in hermetically sealed steel tubes or ABS plastic modules, providing protection and stable optical performance. Pigtails are terminated with connectors such as SC/APC or LC/UPC for easy integration . Environmental Tolerance: Designed for both indoor and outdoor use, FBT splitters maintain performance across -40°C to +85°C, with vibration and temperature cycling compliance per Telcordia GR-1221 standards . Applications:

• FTTH Deployments: Cost-effective splitting at fiber distribution points for a small number of subscribers .
• CATV Networks: RF-over-fiber signal distribution using 1310/1550 nm wavelengths .
• PON Networks: Low-port-count splitting in GPON or EPON architectures .
• Network Monitoring: Asymmetric split ratios allow tapping a small percentage of the signal for testing without disrupting the main path .
• Fiber Optic Sensors and Test Equipment: Signal distribution and power monitoring . Manufacturing Notes: FBT splitters are created by fusing and tapering two or more optical fibers under controlled heat and tension. The splitting ratio is determined by the taper length, fusion temperature, and pulling speed. This passive design requires no electrical power, making it suitable for remote or power-limited installations . Comparison with PLC Splitters: FBT splitters are ideal for low-ratio, cost-sensitive applications, while PLC splitters are preferred for high split counts and uniform performance across multiple outputs . FBT splitters remain a reliable, cost-effective solution for modern fiber networks, balancing performance, environmental resilience, and flexibility in split ratios for diverse telecom and data applications.