APC connector is the most widely used fiber connector type today. “APC” stands for Angled Physical Connect. The angle of the ferrule end face is the 8-degree angle, which is very helpful for the tight connection of fiber end faces. We stock a wide variety of pigtail fiber types, including single mode and multimode, with all major connector options like SC, LC, ST, and FC available with UPC or APC polish. Pigtail connectors are LC, LC/APC, SC, SC/APC, ST and E2000. 5/125, 50/125 and 10GB 50/125 and modes are multimode, singlemode. That is a fiber optic pigtail, and it is one of the most misunderstood parts of an optical network. Get the wrong connector type, the wrong polish, or skip proper fusion splicing technique—and you're looking at elevated signal loss, increased back reflection, and a.