Chromatographic sorting of OPGW48 core optical fiber cable

48-core OPGW cables use color-coded fiber bundles to enable systematic identification and sorting for installation, testing, and splicing.

Fiber Construction and Color Coding

OPGW cables, such as the 48-core type, contain high-purity silica fibers doped with germanium, coated with UV-curable acrylate for protection . The fibers are grouped into bundles of 12 fibers, each bundle identified by a color-coded thread, while individual fibers within the bundle follow a standard color sequence (Blue, Orange, Green, Brown, Slate, White, Red, Black, Yellow, Violet, Rose, Aqua), . This color coding allows technicians to systematically identify and sort fibers during installation or testing.

Sorting and Identification Process

1. Bundle-Level Sorting: Each 12-fiber bundle is separated from the stainless steel tube or loose tube within the OPGW cable. The color-coded threads help distinguish bundles quickly.
2. Individual Fiber Identification: Within each bundle, fibers are identified by their standardized color sequence, which ensures that each fiber can be traced from one end of the cable to the other without confusion.
3. Testing and Verification: Optical fibers are tested for attenuation, chromatic dispersion, polarization mode dispersion (PMD), and mechanical integrity using OTDR (Optical Time-Domain Reflectometer) or back-scattering techniques . This ensures that each fiber meets performance specifications before deployment.
4. Splicing and Termination: Once sorted, fibers are prepared for splicing or termination. The color-coded system allows technicians to match fibers accurately, reducing the risk of misconnection in high-count cables.

Practical Considerations

• Loose Tube Design: Many 48-core OPGW cables use a loose tube or Spiral Space® design, which prevents fiber strain during installation and allows easier access for sorting .
• Environmental Protection: Fibers are encased in stainless steel tubes and aluminum pipes, providing mechanical and electrical protection while maintaining fiber integrity .
• Documentation: Detailed cable drawings and datasheets indicate the fiber bundle layout, color codes, and sequence, which is essential for systematic sorting and network mapping .

Summary

While "chromatographic sorting" is not a standard term in OPGW deployment, the color-coded bundle and fiber system effectively serves the same purpose, allowing technicians to identify, separate, and manage individual fibers in a 48-core OPGW cable for installation, testing, and maintenance. Proper adherence to color codes and testing protocols ensures reliable optical performance and simplifies network operations.