Abstract
We have measured the material and mode dispersion of a 50-psec Cerenkov light pulse generated in 500-m lengths of low-loss graded and step-index Corning fibers. The initial 15.7-nsec full width at half-maximum (FWHM) transmitted pulse in the graded fiber was reduced to less than 2 nsec with narrow-band optical filtering. Parallel measurements in the step-index fiber gave a value of less than 4 nsec for an initial 16.3-nsec FWHM pulse. Fluorescence induced in the fiber by the electron radiation was less than 1% of the amplitude of the transmitted Cerenkov light in the graded fiber and approximately 2% in the step fiber.
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