Fiber optic flanges are precision mechanical interfaces that connect fiber optic cables to optical components, available in SM1, SM05, and C-Mount types for various connector standards.

Types and Thread Configurations

Fiber optic flanges are designed to interface fiber cables with optical systems or mechanical components. Common types include:

• SM1 Flanges: Feature 1.035"-40 threads, suitable for integration into 30 mm coaxial systems. Available with internal threads (knurled for hand-tightening) or external threads (dual concave surfaces for tool-free installation using a ring tool) ( ).
• SM05 Flanges: Feature 0.535"-40 threads, with external thread series having light-blocking recessed holes for installation from either side using a snap ring wrench, and internal threads with knurled edges for manual installation ( ).
• C-Mount Flanges: Allow connection of terminated fibers to components or cameras with C-Mount threads. External threads include light-blocking recessed holes for installation using a retaining ring wrench ( ).

Connector Compatibility

Flanges are compatible with standard fiber optic connectors, including:

• FC/PC and FC/APC: Both narrow and wide key options for precise alignment.
• SMA connectors: Ensures secure coupling with experimental setups.
• Flanges can convert these connectors to standard SM series threads or C-Mount threads, enabling integration with free-space optical components or lens sleeves ( ).

Material and Surface Treatment

High-quality flanges are typically made from 304 stainless steel, providing durability and corrosion resistance. They undergo electromagnetic demagnetization to minimize magnetic interference, and surface treatments like plasma cleaning and sandblasting reduce reflectivity and ambient light impact ( ).

Applications

• Coupling single-mode and multi-mode fiber couplers with optical components.
• Integration into experimental setups requiring precise alignment and minimal insertion loss.
• Connection to cameras or optical instruments via C-Mount interfaces.
• Customizable for different diameters (e.g., Ø12.7 mm, Ø25.4 mm) and special requirements ( ).

Installation Features

• Tool-free installation: Some external thread flanges allow installation from either side using specialized ring tools.
• Hand-tightening: Internal thread flanges often feature knurled edges for secure manual attachment.
• Light-blocking designs: Recessed holes prevent light leakage during optical experiments ( ).

Customization

Manufacturers like LBTEK and JCOPTIX offer customization for:

• Material selection
• Thread type and size
• Surface treatment
• Special dimensions to meet experimental or industrial needs ( ). Fiber optic flanges are essential for precise, stable, and low-loss connections in optical systems, ensuring compatibility across various connector types and mechanical setups.