Abstract
An excellent fibre amplifier of Er3+-doped silica fibre with a multicomponent core composed of Na2O, CaO, Al2O3, SiO2, and Er3+, is realised. A maximum signal gain of 37 dB for a pump power of 23 mW at 1.48 μm and the gain coefficient of 3.5 dB/mW are attained.

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