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A pair of fiber optic pigtails consists of two short optical fibers, each with a factory-terminated connector on one end and a bare fiber on the other, used for splicing into a fiber optic cable system.

What Fiber Optic Pigtails Are

A fiber optic pigtail is a short length of optical fiber, typically 0.5 to 2 meters long, with a factory-installed connector on one end and a bare fiber on the other. The connector end is polished and tested to ensure low insertion loss and high return loss, while the bare end is designed for fusion or mechanical splicing to a fiber optic cable in the field . This design allows for precise, reliable connections without the need for field-terminated connectors, which are slower and less consistent .

Why Use a Pair of Pigtails

Using a pair of pigtails is common when connecting two fibers from a bulk cable to network equipment or patch panels. Each pigtail is spliced to a fiber in the main cable, and the connector ends plug into devices, ODF ports, or splice trays. This setup ensures factory-grade connector performance while providing flexibility for field splicing .

Differences from Patch Cords

• Pigtail: Connector on one end, bare fiber on the other; usually unjacketed; designed for splicing.
• Patch Cord: Connectors on both ends; jacketed; used for connecting pre-terminated devices . A patch cord can be cut in half to create two pigtails, which is sometimes done to test performance before field installation .

Connector Types and Applications

Fiber pigtails come in various connector types such as LC, SC, ST, FC, and in polish types like UPC or APC. They are widely used in telecommunications, LAN/WAN networks, CATV, FTTH deployments, and data centers. Specialized versions include armored or waterproof pigtails for harsh environments .

Summary

A pair of fiber optic pigtails provides a reliable, factory-terminated connection for splicing into fiber networks, combining the precision of pre-terminated connectors with the flexibility of field splicing. They are essential for terminating bulk fiber cables in ODFs, patch panels, or distribution boxes, and are distinct from patch cords due to their single-ended connector design and splicing purpose .