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New tapered active fibres for very low noise amplifier applications

New tapered active fibres for very low noise amplifier applications

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A new Er-doped fibre design for low noise amplifier applications is presented. The active fibre is continuously uptapered from the signal input end to the signal output end. Generated amplified spontaneous emission is thus reduced and high gain properties are preserved. Noise figure reductions of more than 0.5dB for copropagating pump and 2.0dB for counterpropagating pump are predicted.

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