Dynamics of the population grating formation in erbium-doped fibers

• Autores: E. Hernández-Hernández, L.O. Martínez-Martínez, S. Stepanov
• Localización: Revista Mexicana de Física, ISSN-e 0035-001X, Vol. 61, Nº. 6, 2015, págs. 458-465
• Idioma: inglés
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• Resumen

  • Experimental results on formation dynamics of population gratings in erbium-doped fiber (EDF) investigated via two-wave mixing (TWM) are reported. It is shown that at all three utilized essentially different recording wavelenght 1492, 1526 and 1568 nm the transient TWM response in EDF with low erbium concentration ("almost equation to" 640 ppm) has the characeristic rate significantly larger than that of the population of the Er^(3+) meta-stable level evaluated from the fluorescence dynamics. Additionally in EDF with high erbium concentration ("almost equation to" 5600 ppm) the TWM response is faster (even at low recording power) and the relative TWM amplitude is lower than that in EDF with low concentration. General increase of the TWM response rate is explained by contribution of a transient decrease of the fiber average absorption level, while above-mentioned differences observed in heavily doped EDF - by spatial migration of the excited states. The spectral dependence of the later effect is attributed to the difference in the absorption/emission cros-section ratio of the Er^(3+) ions at the utilized wavelengths.