A simple treatment for different dispersive pulse-broadening mechanisms in optical fibers is given. The modal dispersion coefficients for a high-OH- multimode step-index optical fiber were measured at the wavelengths 532, 355, and 266 nm with the use of a pulsed Nd:YAG laser. An empirical relationship expressing the modal dispersion coefficients as a function of wavelength for the range 532 to 266 nm was calculated.

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