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Journal of Nonlinear Optical Physics & Materials

FAST LIGHT ENHANCEMENT BY BIDIRECTIONAL PUMPING IN ERBIUM-DOPED FIBERS

José Miguel Ezquerro, G. Hernandez, M. Nombela, Óscar G. Calderón, Sonia Melle

Published Mar 1, 2010• 4 citations
Publisher

Abstract

We analyze the effect of pump configuration on the propagation velocity of an amplitude-modulated 1536 nm signal propagating through an ultra-highly doped erbium fiber amplifier. The nonlinear effects arising from the high value of the doping level lead to a strong variation of the pump power and signal gain along the fiber. We found that bidirectional pumping presents larger advancements than co-propagating and counter-propagating configurations. Numerical simulations allow us to explain the phenomenon in terms of the gain profile uniformity.

DOI
10.1142/s021886351000498x

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We analyze the effect of pump configuration on the propagation velocity of an amplitude-modulated 1536 nm signal propagating through an ultra-highly doped erbium fiber amplifier. The nonlinear effects arising from the high value of the doping level lead to a strong variation of the pump power and signal gain along the fiber. We found that bidirectional pumping presents larger advancements than co-propagating and counter-propagating configurations. Numerical simulations allow us to explain the phenomenon in terms of the gain profile uniformity.
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.
A perturbation method is used to study the interactions among the signal power, pump power, and metastable population density for fast light in an erbium-doped fiber amplifier. The impact of temporal pump depletion (TPD) on fast light is investigated in which TPD is the response of the pump power to the temporal variation of the metastable population density. It is found that the gain coefficient and the absolute value of the negative group velocity are overestimated without considering the TPD. The effects of high-order dispersions on fast light are also shown.
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.