US Patent 7104701 Expanded beam converter for MIL-PRF-83526/17 optical connector

The fiber optic connector includes a bulkhead connector housing, an expanded beam insert body, ferrules, ball lenses, focal length spacers, and a mating plane adapter. The expanded beam insert body is mounted to the bulkhead connector housing. The ferrules, ball lenses, and focal length spacers are mounted on the expanded beam insert body. The mating plane adapter is mountable to the bulkhead connector housing.