Abstract
To study profile dispersion effects on transmission bandwidth in high-bandwidth graded-index fibers, baseband frequency responses of various graded-index fibers with different profile parameters have been characterized in the 0.78–1.50-μm wavelength range. The test graded-index fibers were made by the MCVD technique. Intrinsic intermodal dispersions of these fibers were determined using a combination of a GaAlAs laser and a grating monochromator, a mode-locked Nd:YAG laser, an InGaAsP/InP laser, and stimulated Raman scattering in a single-mode fiber as the light sources. Transmission bandwidth functional dependences on wavelength are presented. The transmission bandwidth of the individual fibers changed by more than 400% within the experimental spectral range. The maximum transmission bandwidth so far observed was 3.74 GHz·km at 1.225-μm wavelength for a fiber with 0.20 N.A. Transmission bandwidth spectra were compared with computer calculated results based on Olshansky’s theory.
© 1980 Optical Society of America
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