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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 Er3 +doping levels. The results show that the use of this technology allows improving the EDFA's radiation tolerance by increasing the concentration of Er3 +ions provided this is not accompanied with higher concentrations of other dopants, which influence the radiation sensitivity of the fiber.
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Gusarov et al. (2009) studied this question.
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