https://cieonline.co.uk/mil-spec-d38999-contactless-expanded-beam-circular-fibre-optic-connectors-from-lane-electronics/
Nov 28, 2025 - For performance-critical applications in harsh environments High performance, flexible, cost effective - simple termination process allows rapid in-field
fibre optic connectorsmil specexpanded beamcontactlesscircular
https://www.3m.com/3M/en_US/p/c/electronics-components/interconnect-products/expanded-beam-optical-solutions/i/electronics/
Expanded beam optical fiber connector systems that have expanded beam ferrules for reduced sensitivity to dust and increased reliability.
expanded beamoptical solutionsunited stateselectronics