The leather cord and the pigtail fiber are of different thicknesses

Leather cords are generally thicker than pigtail fibers due to their reinforced structure and protective layers, while pigtail fibers are thinner and more flexible for precise splicing.Structural Differences

Leather cords are designed with multiple cores (typically one, two, or four) arranged in a figure-eight configuration, surrounded by reinforcement materials and a protective sheath made of low-smoke, halogen-free material. This design provides mechanical protection, durability, and safety for indoor wiring, which naturally results in a thicker overall diameter compared to a single fiber or pigtail . Pigtail fibers, on the other hand, consist of a short length of optical fiber with a factory-terminated connector on one end and a bare fiber on the other. They are usually thin and flexible, lacking the heavy reinforcement of leather cords, which allows them to be easily spliced to incoming fibers in optical distribution frames or terminal boxes . The smaller diameter facilitates precise alignment and low-loss splicing.

Functional Implications

• Mechanical Protection: Leather cords' thickness provides extra protection against bending, pulling, and environmental stress, making them suitable for permanent installations where durability is critical .
• Flexibility and Splicing: Pigtail fibers' thinner profile allows for easy fusion or mechanical splicing, enabling clean, low-loss connections in tight spaces or distribution panels .
• Application Scenarios: Leather cords are often used in access networks or indoor cabling where multiple fibers need protection, while pigtails are used to terminate fibers at distribution points and connect to active equipment .

Summary

The difference in thickness between leather cords and pigtail fibers is primarily due to their intended function and construction. Leather cords are thicker for reinforcement and protection, whereas pigtail fibers are thinner to allow flexible, precise splicing and integration into optical networks. Understanding this distinction is essential for proper installation, maintenance, and optimization of fiber optic systems .