Fig. 2: The temporal trace of OTDR in the SSMF and NANF (in one cycle).
From: Coherent optical interconnects using Fermat number transform and hollow core fibre

The propagation latency of NANF is 28.4% lower than that of the SSMF. OTDR optical time-domain reflectometer, SSMF single-mode fibre, NANF nested anti-resonant nodeless fibre.