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.