1.
Opt Lett
; 33(8): 827-9, 2008 Apr 15.
Article
in English
| MEDLINE
| ID: mdl-18414546
ABSTRACT
We report a change from sub- to superluminal propagation upon increasing the modulation frequency of an amplitude-modulated 1,550 nm signal when propagating through highly doped erbium fibers pumped at 980 nm. We show that the interplay between the pump absorption and the pump-power broadening of the spectral hole induced by coherent population oscillations may drastically affect the fractional advancement or delay of the signal for the considered fibers.