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| FC connector | |
|---|---|
| Name | FC connector |
| Type | Optical fiber connector |
| Invented | 1980s |
| Inventor | NTT |
FC connector is a threaded optical fiber connector widely used in telecommunications, test equipment, and instrumentation. Originating in the 1980s, it became prominent in NTT research and in standards for precision fiber alignment. The connector is notable for its mechanical robustness, repeatable insertion loss, and use in environments ranging from laboratory benches to CERN accelerator diagnostics and NASA flight instrumentation.
The FC connector was developed to provide a stable, low-loss interface for single-mode and multimode fiber links in telecommunications, aerospace, and metrology. It gained adoption alongside connectors such as ST connector, SC connector, LC connector, and MU connector in equipment from manufacturers like Fujikura, Corning, Sumitomo Electric Industries, and JDS Uniphase. Standards bodies and testing organizations including International Telecommunication Union, IEC, and TIA have referenced threaded connectors in broader connector and fiber optic testing guidelines.
The FC connector employs a screw-on coupling mechanism to secure a ferrule and ensure axial alignment. Typical components include a ceramic or metal ferrule, a threaded shell, a spring for axial preload, and a housing with a key or flat for orientation. Ceramic ferrules are commonly made of zirconia materials from suppliers such as Kyocera and have tight tolerances comparable to components used in precision optics at MIT Lincoln Laboratory and Lawrence Livermore National Laboratory. Mechanical design considerations draw on manufacturing practices used in precision engineering firms like Hexagon AB and machining standards applied at institutions such as National Institute of Standards and Technology.
Performance metrics focus on insertion loss, return loss, repeatability, and durability. Typical single-mode insertion loss values are specified by test procedures from IEC 61300 and industry test suites endorsed by ANSI and TIA. Return loss performance depends on ferrule endface geometry—PC, UPC, and APC polish styles—similar to endface standards referenced by ITU-T. Durability specifications often reference mating cycle counts comparable to those outlined by MIL‑STD‑202 and testing regimes used by European Space Agency contractors. Temperature and vibration performance are evaluated using protocols applied by SAE International in aerospace component testing.
Variants include FC/PC (Physical Contact), FC/UPC (Ultra Physical Contact), and FC/APC (Angled Physical Contact) endfaces; each variant suits different return loss needs similar to choices made for Nikon optical assemblies or ZEISS metrology heads. Hybrid adapters allow mating with ST-to-FC adapters, SC-to-FC adapters, and other interconnects used by manufacturers such as Amphenol and TE Connectivity. Ruggedized adaptations have been produced for military contractors like BAE Systems and for oil and gas deployments by firms such as Schlumberger. Compact variants were integrated into rack systems supplied to Cisco Systems and test benches at Keysight Technologies.
Termination requires precise fiber preparation, polishing, or factory-terminated pigtails supplied by vendors like Prysmian Group and Superior Essex. Field termination options include pre-polished splice sleeves and adhesive-and-cure processes documented by technical teams at Siemon and Panduit. Proper installation follows cleanliness protocols influenced by laboratory practices at Sandia National Laboratories and inspection techniques using tools from EXFO and Viavi Solutions. Cable management solutions often reference rack standards developed by EIA and integration practices used in data centers operated by Equinix.
FC-style connectors are used in test and measurement equipment at companies like National Instruments, in fiber optic gyroscopes for aerospace programs at Boeing and Airbus, and in sensing networks deployed by research groups at Caltech and Stanford University. They appear in optical amplifiers and lasers produced by IPG Photonics, in laboratory optical benches at Lawrence Berkeley National Laboratory, and in metrology systems at NIST. Telco splice panels from incumbents such as AT&T historically employed rackmount modules compatible with threaded connectors.
Advantages include mechanical stability under vibration, good repeatability for laboratory and field tests, and compatibility with high-precision ferrules sourced from firms like Nidec Copal Electronics. Limitations are higher mating time compared with push-pull connectors used by Juniper Networks and Arista Networks, bulkier coupling hardware relative to LC and MU miniaturized connectors, and declining prevalence in some data center deployments favoring higher-density options from vendors like HPE.
Category:Fiber-optic connectors