Circular connector for fiber optic cable

Fiber optic circular connectors are rugged, multi-channel interconnect solutions designed for harsh environments, available in various configurations, standards, and fiber types.OverviewFiber optic circular connectors are designed to provide reliable, high-density fiber connectivity in industrial, military, aerospace, marine, and broadcast applications. They are typically round in shape, allowing for secure mating, environmental sealing, and resistance to vibration and shock. These connectors can accommodate single-mode or multi-mode fibers, and many support expanded beam or MT ferrule technologies for high-density applications .Key Types and FeaturesMIL-DTL-38999 Derived Connectors: Common in military and aerospace applications, these connectors support multi-channel MT fiber optics, with 12- or 24-fiber ferrules in single-mode PC, single-mode APC, or multi-mode PC configurations .Expanded Beam Connectors: Designed for harsh environments, these connectors use optical lenses to expand and focus the light, offering 1 to 16 fiber contacts and are field-terminable and repairable .M28876 and THD Connectors: Ruggedized connectors compliant with MIL-PRF-28876, suitable for aerospace and military applications, often featuring anti-vibration coupling and ceramic ferrules .Commercial and Industrial Circular Connectors: Bulgin 4000–6000 series and similar products provide IP66–IP69K ratings, secure locking mechanisms, and are suitable for FTTX, broadcast, marine, and civil engineering applications .ApplicationsMilitary and Aerospace: High-density MT ferrule connectors for radar, tactical communications, and avionics .Industrial and Marine: Expanded beam and ruggedized connectors for harsh environmental conditions .Broadcast and Telecommunications: Compact, field-terminable connectors for outdoor broadcast and FTTX networks .Medical and Defense: Specialized circular connectors for precision and reliability in critical systems .Accessories and SupportMany suppliers provide strain relief backshells, dust caps, patch cords, spare termini, and fully tested assemblies. Field-terminable options allow for on-site installation and repair without specialized tools, enhancing flexibility in deployment .Manufacturers and SourcesAmphenol Fiber Systems International (AFSI): Offers M28876, THD, NGCON, and ARINC 801 connectors for military and commercial aerospace .Lane Electronics: Distributes connectors from EATON Souriau, Cinch Fibreco®, and Neutrik, including MIL-DTL-83526 compliant options .Bulgin: Provides 4000–6000 series circular fiber connectors for industrial, marine, and broadcast applications .DigiKey / Amphenol Aerospace: Supplies MT 38999 multi-channel high-density circular connectors for harsh environments .Mouser Electronics: Offers a wide inventory of circular fiber optic connectors with datasheets and pricing for various applications . Fiber optic circular connectors are essential for high-performance, reliable optical interconnects in environments where durability, density, and signal integrity are critical. Selecting the right package depends on fiber type, channel count, environmental rating, and compliance with military or industry standards.