The core of the fiber pigtail is made of quartz glass or plastic and is responsible for transmitting optical signals. 5m to 2m—that has a factory-terminated connector on one end and bare fiber on the other end. The connector end is polished and tested under factory conditions, ensuring low insertion loss and high. A fiber optic pigtail is a fiber optic cable with one end factory - terminated with a connector (SC FC LC ST Connector)and the other end bare.