Nufern offers specialty multimode fiber for military, aerospace and industrial applications. Designed for use in extreme temperatures and harsh environments, the fibers are available in step- and graded-index configurations. Numerical apertures range from 0.06 to 0.45, with core sizes from 20 to 700 µm. The fibers are available with acrylate, polyimide and silicone coatings, with and without up-buffers. Radiation-resistant multimode fiber also is available.