Acoustic vibrations sensitivity of negative curvature hollow core optical fibres (Invited)

We report on various aspects of interaction of acoustic waves with light guided in negative curvature hollow core fibres. Backscattering in these fibres is significantly suppressed thus greatly reducing a potential to exploit them for distributed acoustic sensing. In transmission, on contrary, their sensitivity to acoustic waves might even exceed sensitivity of conventional fibres but it can be controlled to some extent by proper design.