Fig. 2: Characterization of the fabricated fibre.
From: Broadband optical fibre with an attenuation lower than 0.1 decibel per kilometre
a, SEM of the fabricated HCF2. b, Bi-directional OTDR traces at 1,310 nm and 1,550 nm. c, Mean loss and 95% confidence level (CL) of four separate cutbacks (1,200–1,650 nm) compared with OTDR results and a fifth cutback to show the spectral loss in the 1,650–1,950 nm range. d, Cutback loss details in the 1,270–1,350 nm and 1,500–1,560 nm bands.
