A fiber pigtail usually has an optical connector pre-installed at one end and where the other end bare fiber is used for fusion splicing to another fiber. Pigtails can have female or male connectors. Fiber optic pigtails are usually unjacketed in order to be spliced and then protected in a fiber splice tray with a mechanical or thermal splice joint protector.http://www.cobtel.com/patch-cord-or-jumper/