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Advances in Optical Sciences Congress

Pulse width depending group velocity on Erbium-doped fibers

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

Published Jan 1, 2009• 0 citations
Publisher

Abstract

We report a change in the propagation regime (subluminal-superluminal) of light pulses in a pumped erbium doped fiber. We explain this behavior as a propagation effect. A pulse-width separator based on this effect is proposed.
DOI
10.1364/sl.2009.jwa29

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We experimentally and theoretically study the propagation of a 1536 nm light pulse superposed on a continuous wave background in a highly doped erbium fiber pumped at 977 nm. We observe a transition from subluminal to superluminal propagation with the pulse bandwidth. Furthermore, an improvement of the pulse delay and pulse distortion when increasing the pulse peak and keeping constant the background power is reported. These results are due to the relation between the pump-broadened transparency hole (induced by the coherent population oscillations) and the competition between gain and absorption along the fiber.
We observe both extremely slow and superluminal pulse propagation speeds at room temperature in an erbium-doped fiber (EDF). A signal at 1550 nm is sent through an erbium-doped fiber with varying powers of a 980 nm pump. The degree of signal delay or advancement is found to depend significantly on the pump intensity. We observe a maximum fractional advancement of 0.124 and a maximum fractional delay of 0.089. The effect is demonstrated both for a sinusoidally modulated signal and for Gaussian pulses. The ability to control the sign and magnitude of the pulse velocity could have important implications for applications in photonics.
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.