Abstract

Dispersive differences between B2O3 and SiO2 constituents make nonparabolic profiles optimal equalizers of intermodal group delays in fibers with graded B2O3–SiO2 cores and uniform B2O3–SiO2 cladding. Pulse dispersion measurements were correlated with profile shapes in a systematic study of multimode fibers with near power law gradients. Far field spatial ray filters were used to diagnose impulse response shapes so that new fibers could be fabricated with closer-to-optimal profile gradients. One of the fibers had an α ≈ 1.77 power law exponent that was nearly optimal for λ = 907.5-nm wavelength and caused 2σ = 0.26-nsec/km full rms output pulse spreading. When expected material dispersion effects were deconvolved from the output pulse spreading, the resultant pulse width was approximately 75 times less than the result expected for a comparable step-index fiber. This is the largest pulse width reduction reported yet.

© 1976 Optical Society of America

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