G. Wiederhecker, T. Alegre, A. Rieznik, T.A.R. Branciforte, H. Fragnito
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Spectral replica holes in the ASE spectra of erbium-doped fibers with different co-doping elements and erbium concentrations
We report on the observation of spectral replica holes in erbium doped fibers with different co-doping elements. Replica holes in the long wavelength region are enhanced by co-doping with lanthanum. Increasing the erbium concentration tends to wash out replica holes. The width and depth of holes are measured at room (300 K) and low (77 K) temperatures.