An optical cable can be split into multiple optical fibers using a fiber optic splitter, which divides a single light signal into several outputs without converting it to electrical signals.

How Optical Fiber Splitting Works

A fiber optic splitter is a passive device that takes an incoming optical signal and distributes it into multiple output fibers. It operates without electricity, relying on the physics of light—reflection, refraction, and waveguiding—to divide the signal among the outputs, making it highly reliable and low-maintenance . The splitter can be connected to a main fiber cable, and each output fiber then serves a separate device or endpoint .

Types of Fiber Optic Splitters

1. Fused Biconical Taper (FBT) Splitter: Made by fusing and stretching two or more fibers, FBT splitters are commonly used for smaller split configurations like 1×2 or 1×4. They allow customizable splitting ratios and are widely used in passive networks .
2. Planar Lightwave Circuit (PLC) Splitter: Uses lithography to create waveguides on a silica glass substrate, enabling precise and even splitting of light. PLC splitters are ideal for larger applications, such as 1×32 or 1×64 splits, and are commonly deployed in FTTH and PON systems .

Splitting Ratios and Signal Considerations

Splitters are denoted by a 1×N or 2×N notation, where one input fiber is split into N outputs. Each split reduces the signal strength proportionally, so higher split ratios result in lower power per output. To maintain signal quality, optical amplifiers may be used in long-distance or high-split networks . Common splitting methods include:

• Centralized Splitting: A single splitter in a distribution box connects one input fiber to multiple outputs, ideal for dense urban areas .
• Cascaded Splitting: Multiple splitters are arranged in stages between the central office and endpoints, allowing flexible network expansion while managing optical loss .

Applications

Fiber splitting is widely used in:

• FTTH networks: One fiber from the provider can serve multiple homes using a splitter, reducing the need for multiple fiber lines .
• Passive Optical Networks (PON): Splitters distribute signals from the Optical Line Terminal (OLT) to multiple Optical Network Units (ONUs) efficiently .
• 5G and small cell networks: Splitters allow multiple devices to share a single fiber infrastructure, saving cost and space .

Benefits

• Cost-effective: Reduces the need for laying multiple fibers.
• Scalable and flexible: New devices can be added without major infrastructure changes.
• Reliable and maintenance-free: Passive operation ensures minimal failure risk.
• Supports high-speed data: Maintains fast transmission rates across multiple endpoints . In summary, splitting an optical cable into multiple fibers is achieved using fiber optic splitters, either FBT or PLC types, which allow efficient, scalable, and cost-effective distribution of optical signals to multiple devices or locations.