Fiber optic splitters are primarily classified into PLC (Planar Lightwave Circuit) and FBT (Fused Biconical Taper) types, each suited for different network scales and applications.

Overview

A fiber optic splitter is a passive device that divides a single optical signal into multiple outputs or combines multiple inputs into one, without requiring electrical power. They are essential in FTTH (Fiber to the Home), PON (Passive Optical Networks), and other optical communication systems to efficiently share a single fiber among multiple users or devices .

Main Types

1. Planar Lightwave Circuit (PLC) Splitters

• Technology: Uses photolithography to create waveguides on a silica glass substrate, allowing precise and uniform light distribution .
• Split Ratios: Supports high split counts, such as 1×16, 1×32, 1×64, or even 1×128 .
• Advantages: Uniform signal distribution, low insertion loss, wide wavelength range (1260–1650 nm), temperature stability, and high reliability .
• Applications: Ideal for large-scale networks, FTTH deployments, data centers, and high-density telecom networks.
• Packaging Options:
  • Bare Fiber: No connectors, spliced directly to network fibers.
  • Micro Tube: Encapsulated in micro steel tubes for junction boxes.
  • ABS Box: Compact plastic enclosure for indoor use.
  • LGX Box: Metal enclosure with standard fiber interfaces for plug-and-play integration.
  • Rack Mounted: Designed for 19-inch racks in data centers .

2. Fused Biconical Taper (FBT) Splitters

• Technology: Two or more fibers are fused and stretched under heat to form a tapered structure that splits light according to a predetermined ratio .
• Split Ratios: Typically smaller splits like 1×2, 1×4, or 2×2.
• Advantages: Cost-effective for low-split applications, simple design.
• Limitations: Less precise than PLC, sensitive to wavelength variations, not ideal for high-split or WDM applications .
• Applications: Small networks, cost-sensitive deployments, or situations where only a few outputs are needed.

Other Classifications

• Indoor vs. Outdoor Splitters: Outdoor splitters are rugged, weatherproof, and often housed in IP-rated enclosures for pole-mounted or underground use. Indoor splitters are compact and designed for controlled environments like equipment rooms or fiber distribution boxes .
• Balanced Splitters (2×N): Have two input fibers and N outputs, used for redundancy or distributing multiple signals proportionally .
• Multiplexed Splitters (2:8, 4:16): Combine multiple inputs into multiple outputs, useful for distributing separate signals like data and video .

Summary

• PLC splitters are preferred for high-density, large-scale networks due to uniformity, scalability, and stability.
• FBT splitters are suitable for smaller, cost-sensitive networks with fewer outputs.
• Splitters can be packaged in various forms to suit installation environments, from bare fiber to rack-mounted units. Understanding these types helps in selecting the right splitter for network size, application, and environmental conditions, ensuring efficient and reliable optical signal distribution .