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Abstract
The gain properties of multicomponent fibers with a heavily ${\rm{Er}^{3 + }}$-doped phosphate-based core in a silica cladding were investigated in an all-fiber amplifier configuration that included spliced joints of the investigated fibers with silica ones. The maximum value of small-signal gain reached about 38 dB. The maximum small-signal gain per unit length of 3.1 dB/cm was demonstrated in 10 cm long 3 wt.% ${\rm{Er}^{3 + }}$-doped fiber.
© 2019 Optical Society of America
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