Low Bending Loss Nodeless Hollow-core Anti-Resonant Fiber
  We report a high performance nodeless hollow-core anti-resonant fiber with a broadband guidance from 1050 nm to >1900 nm, a transmission attenuation of 200 dB/km, and a low bending loss of 0.25 dB/m for a 5 cm radius at wavelength of 1550 nm. 
Shoufei Gao, Yingying Wang, Xiaolu Liu, Pu Wang
physics.optics