Commonly used optical splitters in PON systems include

The most commonly used optical splitters in PON are FBT (Fused Biconical Taper) and PLC (Planar Lightwave Circuit) splitters, typically deployed in split ratios ranging from 1x2 to 1x64 depending on network requirements.

Types of Optical Splitters

1. FBT Splitters:

• Fused Biconical Taper (FBT) splitters are low-cost and ideal for small split ratios such as 1x2 or 1x4.
• They are suitable for short-distance deployments and smaller subscriber clusters due to their simplicity and cost-effectiveness . 2. PLC Splitters:
• Planar Lightwave Circuit (PLC) splitters provide highly uniform signal distribution and are preferred for larger split ratios like 1x32 or 1x64.
• PLC splitters are more reliable for high-density networks and long-distance deployments, offering consistent performance across all outputs .

Common Split Ratios

• Standard split ratios in PON networks include 1x2, 1x4, 1x8, 1x16, 1x32, and 1x64.
• Odd ratios like 1x3 or 1x5 are occasionally used for specific network designs .
• The choice of split ratio affects bandwidth allocation per subscriber and overall network scalability .

Deployment Architectures

1. Centralized Splitting:

• A single-stage splitter is placed between the OLT and ONTs, typically in a central office or cabinet.
• Advantages include easier maintenance, reconfigurable customer assignments via jumpers, and suitability for high-density urban areas . 2. Cascaded (Distributed) Splitting:
• Multiple splitters are connected in series, often deployed in closures or pedestals closer to subscriber clusters.
• This architecture reduces fiber count from the OLT, saves duct space, and allows flexible network expansion, though customer assignments are generally fixed once deployed .

Summary

In modern PON networks, FBT splitters are commonly used for small-scale splits, while PLC splitters dominate large-scale deployments due to their uniformity and reliability. Split ratios from 1x2 to 1x64 are standard, and deployment can follow centralized or cascaded architectures depending on network density, cost considerations, and scalability requirements . These splitters are essential for enabling cost-efficient, passive, and scalable FTTH networks.