Single-mode fiber pigtails are typically yellow, while multimode fiber pigtails are orange or aqua for OM3/OM4 types.

Standard Color Coding for Pigtails

Fiber optic pigtails follow the TIA-598-C color standard, which assigns specific colors to individual fibers within a cable for easy identification . The outer jacket color of the pigtail indicates the fiber type:

• Single-mode (OS1/OS2): Yellow jacket, 9/125 µm core, designed for long-distance, high-speed transmission .
• Multimode (OM1/OM2): Orange jacket, 62.5/125 µm or 50/125 µm core .
• Laser-optimized multimode (OM3/OM4): Aqua jacket, 50/125 µm core, often used for 10G networks . Some OM4 pigtails may use Erika Violet jackets to distinguish them from OM3 in high-density environments .

Inner Fiber Color Sequence

For multi-fiber pigtails, each individual fiber is color-coded in a 12-color repeating sequence: Blue, Orange, Green, Brown, Slate (Gray), White, Red, Black, Yellow, Violet, Rose, Aqua . This sequence helps technicians identify fibers during splicing or termination. For cables with more than 12 fibers, the sequence repeats, sometimes with stripes to indicate higher counts .

Connector Color Coding

The connector or boot color also provides information about the fiber and polish type:

• Blue connector: UPC (Ultra Physical Contact) polish, typically single-mode.
• Green connector: APC (Angled Physical Contact) polish, single-mode, reduces return loss .
• Beige or Aqua connectors: Multimode fibers, with aqua often indicating OM3/OM4 .

Summary

• Single-mode pigtail: Yellow jacket, blue or green connector depending on polish.
• Multimode pigtail: Orange jacket (OM1/OM2) or Aqua jacket (OM3/OM4), beige or aqua connector.
• Individual fiber strands: Follow the 12-color TIA-598-C sequence for identification within multi-fiber cables .

This standardized color system ensures accurate identification, splicing, and termination in optical networks, reducing errors and improving maintenance efficiency.