APC vs UPC: What’s the Difference?

APC vs UPC: What’s the Difference? #

Ever wonder what is the difference between ultra physical contact (UPC) and angled physical contact (APC) single-mode fiber connectors and which one to use? As usual, the answer is, “It depends.”

Eight Degrees of Separation #

The main difference between APC and UPC connectors is the fiber end face. APC connectors feature a fiber end face that is polished at an eight-degree angle; UPC connectors are polished with no angle. UPC connectors are not exactly flat, however; they have a slight curvature for better core alignment.

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