Comparison of Low Loss and Delay Performance of Optical Splitters

FBT splitters offer lower initial insertion loss for small-scale configurations, while PLC splitters provide more reliable, uniform performance across multiple outputs and environmental conditions.

Low-Loss Performance: FBT Splitters

FBT (Fused Biconical Taper) splitters are known for their lower inherent insertion loss in basic configurations. For example, a 1x2 FBT splitter typically exhibits 3.2–3.8 dB loss, and a 1x8 splitter shows 7.2–7.8 dB loss . This makes FBT splitters cost-effective and suitable for small-scale or custom splitting ratios. However, when cascading multiple FBT units to achieve higher split ratios (e.g., 1x32), the cumulative insertion loss can rise to 16–18 dB, and excess loss from interconnections may further degrade signal strength . FBT splitters are generally smaller, easier to install, and quicker to produce, but they are more sensitive to wavelength variations and environmental conditions, which can affect long-term reliability .

More Reliable Performance: PLC Splitters

PLC (Planar Lightwave Circuit) splitters are fabricated using waveguide lithography on silica substrates, providing high uniformity and consistent signal distribution across all output ports . They maintain stable performance over a wide wavelength range (1260–1650 nm), making them ideal for modern PON networks and long-distance deployments . PLC splitters also exhibit high return loss, reducing reflections that could destabilize laser sources in OLTs or ONUs . While PLC splitters are more expensive and take longer to manufacture, their durability, environmental resilience, and scalability make them suitable for large-scale networks with high split ratios (1x32, 1x64) and multi-wavelength operations .

Key Trade-Offs

Practical Implications

• Small-scale or cost-sensitive deployments: FBT splitters are advantageous due to lower initial insertion loss and affordability.
• Large-scale, high-density, or long-distance networks: PLC splitters are preferred for their reliability, uniformity, and environmental stability, ensuring consistent signal quality and reduced maintenance over time.
• Network design considerations: Choosing between low-loss FBT and reliable PLC splitters depends on the split ratio, distance, wavelength requirements, and long-term operational stability . In summary, FBT splitters excel in low-loss, small-scale applications, while PLC splitters provide more reliable, uniform performance for large-scale, multi-wavelength, and long-distance optical networks, making the choice dependent on network scale, performance requirements, and cost considerations.