Silica/silica clad optical fiber Fiberguide Industries

When looking for a silica core and silica clad fiber with a hard polymer coating that allows a high core-to-clad ratio
and a numerical aperture (N.A.) of 0.22 for efficient light coupling, the Anhydroguide™ AFSH is the fiber of choice.
The Anhydroguide™ fiber is drawn from preforms manufactured by the Plasma Outside Deposition (POD) process.
Rods of extremely pure synthetic fused silica are coated with fluorine doped silica layers to obtain preforms with
step-like refractive index profiles. Plasma torches prepare the reaction compounds from SiCI4, O2, and fluorine
containing gas. Strong thermal gradients combined with the temperature plasma lead to chemical deposition
conditions, which allow very high fluorine concentrations to be incorporated in the fused silica network. Refractive
index differences of 0.27 corresponding to numerical apertures in excess of 0.28 have been realized with undoped
core rods.

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