Over 25 nm, 16-wavelength-multiplexed signal amplification through fluoride-based fibre-amplifier cascade

Using four cascaded fluoride-based fibre-amplifiers, the authors report equalisation-free, simultaneous amplification of 16 wavelength-multiplexed signals ranging over 25 nm. 4.5 dB gain excursion was obtained for a power budget larger than 77 dB, with a signal-to-noise ratio excursion as low as 3.3 dB over the spectral range considered