Abstract
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> We have studied the effect of gamma-radiation on the small signal gain and on the noise figure of several EDFAs with similar characteristics and based on special highly Er-doped fibers. Those fibers were fabricated using direct nanoparticle deposition technology, with different Er<formula formulatype="inline"> <tex Notation="TeX">$^{3 +}$</tex></formula> doping levels. The results show that the use of this technology allows improving the EDFA's radiation tolerance by increasing the concentration of Er<formula formulatype="inline"><tex Notation="TeX">$^{3 +}$</tex></formula> ions provided this is not accompanied with higher concentrations of other dopants, which influence the radiation sensitivity of the fiber. </para>
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