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a) Experimental setup for BDFA characterization and data sets acquisition; b) Amplifier gain and noise figure as a function of wavelength achieved with 1000 mA pumps currents and −25 dBm signal power; c) Amplifier gain at 1430 nm as a function of total input signal power. TL: tunable laser; MUX: multiplexer; VOA: variable optical attenuator; LD: laser diode; TEC: thermoelectric cooler; Bi: Bi-doped fiber; TFF-WDM: thin film filter wavelength division multiplexer; OSA: optical spectrum analyzer; PM: power meter.

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