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Graded-Index, Optical Fiber

Graded-Index NIR - Fiber Optic Feedthroughs

Graded-Index NIR Fiber Optic Feedthroughs, and Accessories

Accu-Glass Products Graded-index fiber optic feedthroughs are constructed with 62.5, 100, 200, 400, 600, and 1000-micron graded-index Multimode fibers.  They are designed for vacuum applications requiring fiber optic connections from inside a vacuum system to external equipment and optimized for use at either 850 or 1300nm NIR wavelengths.  The fiber is hermetically sealed into a stainless steel shell using the latest in glass-ceramic bonding technology and terminates on the vacuum and airside with Premium SMA 905 connectors.  SMA to ST and SMA to FC UHV adapters are available. FC and ST connections are also available. Ultrahigh vacuum polyimide buffered optical patch cable assemblies are constructed to meet the demands of ultrahigh vacuum environments.

Fiber Optic Feedthroughs

Polyimide buffered optical fiber cable assemblies are offered to meet the rigorous demands of ultrahigh vacuum environments. These optical fibers are of a core-and-cladding composite construction. The core, or the filament that guides the light, consists of a thin strand of high-transmission fused silica. The cladding is an outer layer of doped, lower refractive-index fused silica. This dual-layer design tightly confines light to the fiber's central core, thus delivering the maximum amount of light possible at the fiber's destination. Fiber diameters are closely controlled during the drawing process, allowing fibers to center well in connectors and boast low loss rates.

Graded-index optical fiber bridges the gap between single-mode and step-index multimode fibers, giving up some bandwidth for ease of termination and light launch. It's more economical than single-mode fiber and primarily used for data communication (not as useful for power transmission) applications requiring medium run distances (2 to 15 km lengths).


  • UHV compatible construction
  • 100, 200, 400, 600, and 1000μm UV, VIS and NIR Step Index fibers
  • 62.5μm Graded Index fiber
  • SMA 905 premium connector interface
  • High temperature rated to 250°C
  • Conflat® and ISO KF compatible mounts
  • Polyimide buffered vacuum rated optical cables