Bare fiber optic pigtails

A bare fiber optic pigtail is a short fiber cable with a factory-terminated connector on one end and an exposed, bare fiber on the other, designed for splicing into a fiber network.Overview

A fiber optic pigtail is typically 0.5 to 2 meters long and features a factory-installed connector on one end and a bare fiber on the other end, which is intended for fusion or mechanical splicing to a trunk or distribution cable in the field . The factory-terminated connector ensures low insertion loss, high return loss, and consistent performance, while the bare fiber end allows flexible integration into optical distribution frames (ODFs), splice closures, or terminal boxes .

Differences from Patch Cords

Unlike fiber patch cords, which have connectors on both ends, pigtails have only one connector and one bare fiber end . Patch cords are used for direct connections between equipment or patch panels, whereas pigtails serve as the interface between pre-terminated connectors and field-installed fiber cables. In some cases, a patch cord can be cut to create two pigtails .

Types and Fiber Specifications

Bare fiber pigtails come in single-mode (OS2) for long-distance or FTTH/PON applications and multimode (OM3/OM4) for in-building or data center networks . They are available in various buffer diameters such as 0.9 mm, 2.0 mm, and 3.0 mm, which should match the splice tray or closure requirements . Common connector types include LC, SC, FC, ST, E2000, SN, CS, and MDC, with polish types like UPC or APC depending on the application .

Splicing and Installation

The bare fiber end is stripped, cleaved, and cleaned before being spliced to the incoming fiber. Proper splicing ensures minimal signal loss (typically 0.01–0.05 dB) and maintains network reliability . Pigtails are widely used in single-mode networks, FTTH deployments, carrier networks, and data center splice fields . They provide a time-saving, reliable, and high-performance solution compared to field-terminated connectors .

Practical Considerations

When selecting bare fiber pigtails, consider:

• Fiber type (single-mode vs multimode)
• Connector type and polish (LC/UPC, SC/APC, etc.)
• Buffer diameter to match splice trays or closures
• Environmental requirements (PVC, LSZH, armored, or outdoor jackets)
• Splicing method (fusion or mechanical) Using the correct pigtail ensures long-term network performance, low insertion loss, and efficient deployment .