Abstract

The resonant group-delay spectra of two erbium-doped silica fibers are measured in the time domain with interferometric measurement setup in the wide-wavelength range from 1.5 to 1.6 μm. The spectrum of the absorption-induced change in dispersion of the erbium-doped silica fibers reveals resonant peaks at 1.53, 1.55, and 1.58 μm that are dependent on the Er³⁺ concentration and the fiber core codopants. The change can be as large as 20 ps/(nm km) at 1.535 μm. for a 250 parts-in-10⁶ Er³⁺ concentration with no Al₂O₃ as a codopant.

© 1994 Optical Society of America

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