Description: PC adapters have a spherical end-face that reduces air gaps and lowers Optical Return Loss (ORL). Understanding fiber connector types—SC/APC, SC/PC, LC/UPC, LC/APC, ST/PC, FC/PC, and FC/APC—is essential for selecting the right interface for your application., two fiber connectors) such that light can reliably pass from one to the other with minimal insertion loss and maximum return loss. A fiber optic adapter, also known as a fiber coupler, is a passive device used to connect and align two optical fiber connectors. Common types include FC/PC Simplex Multimode adapters, LC/APC Simplex Single Mode connectors, and SC/UPC Simplex Single Mode connectors. Ensures low return loss (minimal light reflection back into.