Dual O+C-band WDM transmission over 1-km hollow core NANF using an O-band bismuth-doped fibre amplifier

Amplified transmission of WDM channels over the O- and C-bands is demonstrated using a bismuth-doped fibre amplifier. The transmission medium is an ultra-wide bandwidth nested antiresonant fibre (NANF) offering uniform loss performance across all wavelengths of interest. Comparable performance is obtained across the two bands.