Article Overview

A UPC pigtail cable has a convex, dome-shaped end face, not a flathead type.

Connector End-Face Structure

UPC stands for Ultra Physical Contact, and its fiber end face is slightly convex, resembling a dome rather than being completely flat. This convex shape allows for more precise contact between fiber ends, reducing back reflection and improving return loss performance, typically around -50 dB . In contrast, the older PC (Physical Contact) connectors have a nearly flat surface, while APC (Angled Physical Contact) connectors have an 8-degree angled end face .

UPC in Pigtail Cables

A fiber optic pigtail is a short cable with a factory-terminated connector on one end and a bare fiber on the other for splicing . UPC polish is commonly used on pigtail cables for single-mode applications, including LC, SC, ST, and FC connectors . The convex end face of the UPC connector ensures low insertion loss and compatibility with other UPC or PC connectors, but it is not compatible with APC connectors due to the angle difference .

Summary

  • UPC connectors: convex, dome-shaped end face
  • PC connectors: nearly flat end face
  • APC connectors: angled end face (8°)
  • UPC pigtail cables: use the convex UPC polish, suitable for fusion or mechanical splicing, and are widely used in FTTH, LAN/WAN, and CATV networks Thus, a UPC pigtail cable is not flathead; it features a slightly convex, dome-shaped fiber end face for optimal optical performance.

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