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Fiber optic pigtail square to round connector

Fiber and communications infrastructure knowledge brief Published 10 May 2022

Use this reference to prepare product questions for CJC FIBRE. Check interfaces, capacity, protection and installation requirements against the current product documentation.

Fiber optic pigtails come with either square or round connectors, each designed for specific applications and connector mechanisms, with square connectors typically used for high-density setups and round connectors for secure, threaded connections.

Overview of Fiber Optic Pigtails

A fiber optic pigtail is a short length of optical fiber with a factory-installed connector on one end and a bare fiber on the other end. The bare end is designed to be fusion or mechanically spliced to a fiber in a trunk cable, while the connector end plugs into equipment, patch panels, or transceivers, ensuring low insertion loss and high reliability.

Square Connectors

Form Factor: Square, push-pull latching design. Ferrule Size: Typically 1. 25mm (LC) or 2.

50mm (SC). Applications: High-density environments like data centers, LANs, FTTH, and SFP/SFP+ transceivers. Advantages: Compact, easy insertion/removal, supports duplex connections, and ideal for high-density patching.

Considerations: Relatively fragile and lower pull strength compared to round connectors.

Round Connectors

Form Factor: Round, threaded barrel for coupling. Ferrule Size: Usually 2. 50mm (FC).

Applications: Environments requiring secure, vibration-resistant connections, such as labs, industrial setups, or older multimode networks. Advantages: Stable, secure connection due to screw-on mechanism, suitable for high-vibration conditions. Considerations: Larger size, lower density than square connectors, and slightly more complex to insert/remove.

Choosing the Right ConnectorLC (square, 1. 25mm): Small form factor, duplex-friendly, widely used in modern data centers.

S

C (square, 2. 50mm): Push-pull, common in telecom and FTTH networks.

F

C (round, 2. 50mm): Screw-on, secure, preferred for testing or high-vibration environments.

S

T (round, bayonet): Older multimode networks, some industrial use. Polish Types: PC, UPC, or APC affect return loss; APC is recommended for FTTH, CATV, and WDM applications.

Summary

Square connectors (LC, SC) are ideal for high-density, easy-to-install networks, while round connectors (FC, ST) provide secure, vibration-resistant connections. Selecting the correct pigtail depends on equipment compatibility, network density, and environmental conditions, ensuring reliable, low-loss fiber terminations.

Fiber optic pigtail square to round connector - CJC FIBRE CONSULTANTS [PDF]

Fiber optic pigtail square to round connector

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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