Fiber Optic Patch Cord Color Selection

Fiber optic patch cords use standardized color codes for jackets, connectors, and individual fibers to ensure accurate identification and prevent misconnection.

Outer Jacket Color Coding

The outer jacket of a fiber optic patch cord indicates the fiber type and mode:

• Singlemode (OS2): Yellow jacket
• Multimode OM1 (62.5/125 µm): Orange jacket
• Multimode OM2 (50/125 µm): Orange jacket
• Multimode OM3 (50/125 µm, laser-optimized): Aqua jacket
• Multimode OM4 (50/125 µm, laser-optimized): Violet jacket
• Multimode OM5 (wideband, 50/125 µm): Lime green jacket These colors allow technicians to quickly identify the fiber type at a glance, especially in high-density installations or mixed-mode environments .

Connector Color Coding

Connector colors indicate the fiber mode and polish type:

• Singlemode UPC: Blue connector
• Singlemode APC: Green connector
• Multimode OM1/OM2: Beige connector
• Multimode OM3: Aqua connector
• Multimode OM4: Violet connector
• Multimode OM5: Lime green connector The connector color often matches the fiber type and helps prevent mismatched connections .

Individual Fiber Strand Color Sequence

Inside multi-fiber cables, each fiber is color-coded in a 12-color repeating sequence for identification:

1. Blue
2. Orange
3. Green
4. Brown
5. Slate (Gray)
6. White
7. Red
8. Black
9. Yellow
10. Violet
11. Rose (Pink)
12. Aqua For cables with more than 12 fibers, the sequence repeats with additional markings (e.g., stripes) to maintain unique identification. In high-density or MPO ribbon cables, a 16-color sequence may be used for fibers 13–16: Olive, Magenta, Tan, and Lime .

Practical Tips

• Labeling: Combine color coding with printed labels on jackets or connectors for clarity in complex installations.
• Splicing and Termination: Use the color sequence to match fibers correctly in splice trays or patch panels.
• High-Fiber Count Cables: Apply the “Tube and Fiber” system where each buffer tube and its fibers follow the color sequence for easy identification . By following these standardized color codes, technicians can reduce errors, maintain polarity, and ensure reliable network performance across singlemode and multimode fiber optic systems.