Principle of China Unicom Optical Splitter

China Unicom optical splitters operate as passive devices that divide a single incoming optical signal into multiple output signals using FBT or PLC technology, distributing light power according to a specified split ratio.Core Function

An optical splitter is a passive component in fiber-optic networks, particularly in FTTH (Fiber to the Home) systems, that allows a single optical signal to be shared among multiple users without requiring electrical power . The splitter takes an input light signal and distributes it into two or more output fibers, with the power divided according to the splitter's ratio (e.g., 1:2, 1:4, 1:16, 1:32) to serve multiple endpoints .

Working Mechanism

The operation relies on waveguide interaction and light propagation principles:

1. Signal Ingress: The optical signal enters the splitter through a single input fiber.
2. Waveguide Interaction: Inside the splitter, the light encounters a network of waveguides or fused fibers. These channels are engineered to guide and redistribute the light.
3. Power Division: The light is split according to the split ratio. For example, a 1:4 splitter divides the input power equally among four output fibers, so each receives roughly 25% of the original signal .
4. Signal Egress: The divided signals exit through the output fibers, which connect to end users or further network components.

Types of Splitters

China Unicom optical splitters typically use one of two technologies:

• Fused Biconical Taper (FBT) Splitters: Two or more fibers are stripped of their coating, twisted, and heated to form a tapered structure. The light couples between fibers in the tapered region, allowing control of the split ratio by adjusting the taper length and angle .
• Planar Lightwave Circuit (PLC) Splitters: Use photolithography to create waveguides on a silica substrate. PLC splitters provide precise, uniform splitting and are ideal for larger split configurations (e.g., 1:32, 1:64) with minimal insertion loss .

Key Features

• Passive Operation: No external power is required, making them reliable and suitable for remote locations .
• Bidirectional Functionality: Can split outgoing signals and combine incoming signals for two-way communication.
• Compact Design: Available in small form factors for integration into patch panels, ODFs, or outdoor enclosures.
• Performance Parameters: Include split ratio, insertion loss, uniformity, and isolation, which determine signal quality and efficiency . In summary, China Unicom optical splitters function by redistributing light from a single fiber into multiple fibers using either FBT or PLC technology, enabling efficient and cost-effective deployment of fiber-optic networks to multiple users.