Large diameter fibers (LDF) are fibers with a core diameter greater than or equal to 100 μm. Variants with diameters up to 2000 μm are offered.
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Large diameter fibers typically have a step index profile, i. a step-shaped refractive index profile between the optical core and the optical cladding. The numerical aperture (NA) is indeed in the range between 0.15 and 0.43 by fiber type. The wavelength range of the fibers ranges from UV to IR.
Depending on the wavelength range, so-called low OH and high OH fibers are offered.
For mechanical protection of the fibers they are coated with a so-called buffer. Depending on the application, the following materials are available here.
Typical applications for LDF are