Modulation-frequency-controlled change from sub- to superluminal regime in highly doped erbium fibers
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2008
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Optical Society of America
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Abstract
We report a change from sub- to superluminal propagation upon increasing the modulation frequency of an amplitude-modulated 1550 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.
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Received December 11, 2007; revised March 4, 2008; accepted March 6, 2008; posted March 14, 2008 (Doc. ID 90388); published April 11, 2008