Fiber pigtail specification shows fiber type, connector type, polishing type, ferrule material, insertion loss, return loss, tensile strength, operation temperature and other critical parameters. Here is one example from two MU connector pigtails. The fiber pigtails are designed to support fusion and mechanical splicing for fiber cabling systems. Typical applications include data centers, Broadband CATV, Passive Optical Network PON, WDM or DWDM multiplexing, FTTh, and voice services in ATM and SONET. Fiber optic pigtails are short lengths of optical fiber featuring a pre-terminated connector on one end and exposed fiber on the other for field termination.