Multi-fiber pigtails use color-coded individual fibers per the TIA-EIA-598-A color standard, which allows technicians to identify and trace individual fibers within a bundle quickly and accurately. For most enterprise termination work, single-core pigtails are the standard choice. Fiber optic pigtails are used to terminated fiber optic cables via fusion splicing or mechanical splicing as shown in the picture. A fiber optic pigtail is a short length of optical fiber —typically 0. The connector end is polished and tested under factory conditions, ensuring low insertion loss and high return loss. Economy pigtails offer over a.