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.
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