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What type of fiber optic pigtail bevel connector is it

Fiber and communications infrastructure knowledge brief Published 07 Jan 2023

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

The bevel connector on a fiber optic pigtail is typically either an APC (Angled Physical Contact) or UPC (Ultra Physical Contact) type, with APC connectors featuring an 8° angled end-face and UPC connectors having a flat or slightly curved polish. Understanding Bevel TypesAPC (Angled Physical Contact) connectors have an 8° angled end-face, which minimizes back reflection and is ideal for high-precision single-mode applications such as FTTH, CATV, and long-haul networks. The angled polish ensures that reflected light is directed into the cladding rather than back into the core, improving signal quality.

UP

C (Ultra Physical Contact) connectors have a flat or slightly curved end-face with a high-quality polish, providing low insertion loss but higher back reflection compared to APC.

UP

C connectors are commonly used in single-mode networks where back reflection is less critical, such as LANs and data centers. Common Connector Types with Bevel VariantsSC/APC and SC/UPC: SC connectors use a push-pull mechanism; APC versions are green, UPC versions are blue. FC/APC and FC/UPC: FC connectors are threaded, providing stability in vibration-prone environments; APC is angled, UPC is flat.

MU/UPC and LC/UPC: Smaller form factors for high-density applications; typically UPC polished.

Identifying the Bevel Type

Color coding: Green usually indicates APC, blue indicates UPC. End-face inspection: APC connectors show a visible 8° angle under a fiber microscope, while UPC connectors appear flat or slightly curved. Application context: High-precision, long-distance single-mode networks often require APC; standard single-mode or multimode networks typically use UPC.

Summary

The type of bevel connector on a fiber optic pigtail determines signal reflection characteristics and network performance.

AP

C connectors are angled for minimal back reflection, while UPC connectors are flat for general low-loss connections. Correct selection depends on the network type, fiber mode, and performance requirements.

What type of fiber optic pigtail bevel connector is it - CJC FIBRE CONSULTANTS [PDF]

What type of fiber optic pigtail bevel connector is it

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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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