Various measurements have been made on step index fibers having pure silica cores which are expected to have good radiation hardness properties. These measurements include spectral attenuation, numerical aperture, and bandwidth. Values for the preceeding quantities are given for several step index fibers of various diameters including the following: plastic -clad silica (PCS), QSF -AS, Raychem VSC, Dainichi Diaguide, and Ensign -Bickford fiber.Computer -controlled instrumentation was developed for these measurements and is described.
Results of material dispersion measurements on multimode, graded-index, optical fibers are given. An rf phase shift technique was used. The measurement was repeated for several wavelengths over the spectral width of an LED source. Typically, an LED centered at 820 nm was useful from about 790 to 850 nm. Wavelength coverage can be extended further by using LED's with different central wavelengths. Material dispersion values for high-bandwidth fibers fell in the range 100 to 108 ps /(nm x km) at a wavelength of 825 nm.
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