The appropriate quota for optical splitters depends on network design, typically ranging from 1×2 to 1×64, with centralized 1×32 or 1×64 splits commonly used for FTTH PON networks.

Understanding Split Ratios

The split ratio of an optical splitter defines how the input optical power is divided among its output ports. For example, a 1×8 splitter distributes the input signal equally to eight outputs, while a 1×32 splitter divides it among 32 outputs . The choice of split ratio directly affects signal strength at each subscriber and the overall network performance. Higher split ratios reduce the optical power per port, which may require careful planning to maintain acceptable signal levels.

Splitter Types

• PLC (Planar Lightwave Circuit) splitters: Suitable for high split ratios (up to 1×64 or higher), providing uniform power distribution and stability across temperature variations. Ideal for large-scale FTTH and PON deployments .
• FBT (Fused Biconical Taper) splitters: Cost-effective for small split ratios (1×2, 1×4), but less stable for high splits and wide temperature ranges .

Deployment Architectures

• Centralized splitting: Large splitters (e.g., 1×32 or 1×64) are installed at the central office or OLT. This maximizes OLT port efficiency, simplifies testing, and reduces signal loss from cascaded splitters .
• Distributed splitting: Smaller splitters are deployed in the field, often in multiple stages (e.g., 1×4 at the OLT followed by 1×16 in the field to achieve 1×64 overall). This reduces the number of feeder fibers but may increase complexity and insertion loss .

Multi-Stage Splitting

Cascaded splitters allow flexible network design. For instance, a 1×64 split can be achieved via a 1×4 splitter at the OLT and 1×16 splitters in the field, reducing the number of fibers required between the central office and distribution points . However, each additional stage introduces insertion loss, which must be accounted for in power budgeting.

Practical Recommendations

• For high-density FTTH networks, centralized 1×32 or 1×64 PLC splitters are preferred.
• For smaller deployments or cost-sensitive applications, FBT splitters with 1×2 or 1×4 ratios may suffice.
• Multi-stage distributed splitting is useful when fiber counts between the OLT and field are limited, but careful planning is needed to manage cumulative insertion loss.
• Always consider signal strength, network scalability, and operational efficiency when selecting the splitter quota. By balancing these factors, network designers can optimize both cost and performance while ensuring reliable service to all subscribers.