Gregory T. Jasion,Hesham Sakr,J. R. Hayes,S. R. Sandoghchi,Lucy Hooper,Eric Numkam Fokoua,Arsalan Saljoghei,H.C.H. Mulvad,Marcelo Alonso,Austin Taranta,Thomas D. Bradley,Ian Davidson,Yong Chen,David J. Richardson,Francesco Poletti
We report the first double-nested antiresonant hollow core fiber. The fiber matches the loss of commercial solid core fibers in the C-band (0.174 dB/km) and fundamentally improves it (0.22 dB/km) in the O-band.