Composition of PLC-type optical splitter

A PLC optical splitter consists of a planar waveguide chip, input and output fibers, and protective packaging, enabling precise and uniform optical signal distribution.

Core Components

1. PLC Chip (Planar Waveguide Chip): The heart of a PLC splitter is the planar waveguide chip, fabricated from silica glass on a silicon substrate using photolithography and etching techniques. This chip contains the waveguide network, which directs and splits the incoming optical signal into multiple outputs with high precision and uniformity . 2. Input Fiber: The input fiber channels the optical signal from the source into the PLC chip. It ensures efficient coupling of light into the waveguide network for subsequent splitting . 3. Output Fibers: Multiple output fibers carry the divided optical signals from the PLC chip to their respective destinations. The number of outputs depends on the splitter configuration, such as 1xN or 2xN, where N can range from 2 to 64 . 4. Packaging: PLC splitters are enclosed in various packaging types to protect the chip and fibers, including:

• Bare Fiber: Minimal packaging for integration into fiber management systems.
• Blockless: Compact design without a protective box, suitable for space-constrained installations.
• ABS Box: Enclosed in ABS plastic for outdoor or rugged environments.
• LGX Module: Standardized module for mounting in patch panels or distribution boxes.
• Rack-Mount: Designed for organized deployment in data centers or telecom rooms .

Fabrication and Assembly Steps

1. Silica Glass Deposition: Builds the substrate and cladding layers.
2. Photomask Printing: Transfers the waveguide circuit layout onto a chromium glass mask.
3. Photoresist Application and UV Exposure: Patterns the resist layer to define waveguides.
4. Reactive Ion Etching: Removes silica from exposed areas to form the waveguide structure.
5. Testing and Dicing: Individual PLC chips are tested, cut, and packaged with input/output fibers .

Additional Features

• Splitting Ratios: Determines how the optical power is divided (e.g., 1x4, 1x32).
• Uniformity: Ensures consistent signal strength across all outputs.
• Low Insertion Loss: Minimizes signal degradation during splitting.
• Passive Operation: No external power is required, making it ideal for PON and FTTH networks . PLC optical splitters are essential for efficient, scalable, and reliable optical signal distribution in modern fiber networks, supporting applications such as FTTH, PON, data centers, and high-speed broadband deployments .