The connectors are typically designated "FC/APC" (for Angled Physical Contact), or merely "FCA". Thorlabs' 30127A3 FC/APC Connector has a 2. 0 mm narrow key and an 8° pre-angled ceramic ferrule. Additionally, we offer stainless steel sleeves designed for mating connectors to our stainless steel tubing. It is commonly used with both single-mode optical fiber and polarization-maintaining optical fiber. FC connectors are used in datacom, telecommunications, measurement. 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. Each type varies by shape, polish (APC, PC, or UPC), and return loss performance, which affect PC, UPC, and APC Polish Styles: What's the. 📦 For purchasing, use the RP Photonics Buyer's Guide for fiber connectors. It provides an expert-curated supplier directory, buyer-focused technical background information, and structured selection criteria to support professional procurement decisions. Because of the sloping end face, the APC fiber connector allows the. A fibre optic adapter, sometimes also called a coupler, is a small device designed to terminate or link the fibre optic cables or fibre optic connectors between two fibre optic lines.