Propagation-induced transition from slow to fast light in highly doped erbium fibers

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Oscar G. Calderón, Sonia Melle, M. A. Antón, F. Carreño, and Francisco Arrieta-Yañez
Escuela Universitaria de Óptica, Universidad Complutense de Madrid, C/ Arcos de Jalón s/n, 28037 Madrid, Spain

E. Cabrera-Granado
Department of Physics, Duke University, Durham, North Carolina 27708, USA

Received 4 April 2008; revised 16 June 2008; published 10 November 2008

Weanalyze the propagation regime of an amplitude-modulated 1536 nm signal whentraveling along a highly doped erbium fiber pumped at 977 nmas a function of the fiber length. A propagation-induced transitionfrom superluminal to subluminal propagation takes place along the fiberlength which allows a change in regime solely based uponincreasing the signal modulation frequency. This peculiar behavior is dueto the interplay between pump absorption and pump-power broadening ofthe spectral hole induced by coherent population oscillations. The effectof ion density on this frequency-dependent regime change has beeninvestigated.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.78.053812
DOI:	10.1103/PhysRevA.78.053812
PACS:	42.65.-k; 42.50.Gy 42.65.-k Nonlinear optics 42.50.Gy Effects of atomic coherence on propagation, absorption, and amplification of light YEAR: 2008
KEYWORDS:	amplitude modulation, erbium, fibre lasers, laser beams, laser transitions, light propagation, optical modulation, optical pumping, quantum optics

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