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Journal of the Optical Society of America B

Effect of ion pairs in fast-light bandwidth in high-concentration erbium-doped fibers

Óscar G. Calderón, Sonia Melle, Francisco Arrieta-Yáñez, M. A. Antón, F. Carreño

Published Sep 16, 2008• 9 citations
Publisher

Abstract

The effect of ion pairs in high-concentration erbium-doped fibers on slow- and fast-light propagation enabled by coherent population oscillations at room temperature has been experimentally investigated. We find that an increase of the erbium ion concentration increases the fractional advancement although it degrades the bandwidth of the modulated signals that propagate at superluminal velocities due to the presence of ion pairs in the fiber.

DOI
10.1364/josab.25.000c55

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The effect of ion pairs in high-concentration erbium-doped fibers on slow- and fast-light propagation enabled by coherent population oscillations at room temperature has been experimentally investigated. We find that an increase of the erbium ion concentration increases the fractional advancement although it degrades the bandwidth of the modulated signals that propagate at superluminal velocities due to the presence of ion pairs in the fiber.
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We perform a study of extremely slow pulse propagation speed in densely-doped erbium fibers by using a detuned signal. A quantum coherence effect, coherent population oscillations, produces a very narrow spectral "hole" in the homogeneous broadened absorption profile of the erbium-doped fiber. The resulting rapid spectral variation of the refractive index leads to a large value of the group index. The interparticle interaction between the nearest neighboring active particles due to the high density of erbium ions is considered. The result shows that the nonlinear refractive index can be greatly increased which leads to the smaller group velocity and the larger time delay.
We analyze the propagation regime of an amplitude-modulated 1536nm1536\phantom{\rule{0.3em}{0ex}}\mathrm{nm}1536nm signal when traveling along a highly doped erbium fiber pumped at 977nm977\phantom{\rule{0.3em}{0ex}}\mathrm{nm}977nm as a function of the fiber length. A propagation-induced transition from superluminal to subluminal propagation takes place along the fiber length which allows a change in regime solely based upon increasing the signal modulation frequency. This peculiar behavior is due to the interplay between pump absorption and pump-power broadening of the spectral hole induced by coherent population oscillations. The effect of ion density on this frequency-dependent regime change has been investigated.