Fiber optic pigtails, a type of patch cord with a connector on one end, are typically used for fiber optic splicing.

Overview

For fiber optic splicing, the most commonly used patch cord is a pigtail, which is a short fiber optic cable with a connector on one end and a bare fiber on the other. The bare end is spliced to the existing fiber in the network, while the connector end plugs into equipment such as patch panels, transceivers, or switches . This allows for a clean, low-loss connection and simplifies network maintenance.

Fiber Types

• Single-mode (SM, OS1/OS2): Used for long-distance communication, such as telecom or campus networks. Single-mode pigtails have a small core (~9 µm) and are ideal for precise splicing with minimal signal loss .
• Multimode (MM: OM1/OM2/OM3/OM4/OM5): Used for shorter distances, such as within data centers or office networks. Multimode pigtails have larger cores (50–62.5 µm) and support multiple light modes, making them suitable for high-bandwidth, short-range applications .

Connector Types

Common connectors on pigtails include LC, SC, ST, FC, MPO/MTP, and others. The choice depends on the equipment and network design:

• LC: Small form factor, widely used in modern data centers.
• SC: Common in legacy systems and telecom networks.
• ST/FC: Often used in older installations or specialized applications.
• MPO/MTP: Multi-fiber connectors for high-density environments .

Jacket and Protection

Pigtails are typically reinforced with Kevlar (aramid yarn) for strength and may have jackets in various materials (PVC, LSZH, plenum) depending on the installation environment . Bend-insensitive fibers (G.657A1/A2) are often used in tight spaces to prevent signal loss during routing.

Summary

For fiber optic splicing, single-mode or multimode pigtails with the appropriate connector type are standard. The bare fiber end is fusion-spliced to the network fiber, while the connector end interfaces with equipment. Choosing the correct fiber type, connector, and jacket ensures low-loss, reliable connections and compatibility with the network infrastructure .