Description in English
Single mode silica fibres are dominantly used for broadband communications and frequently terminate in devices located in office rooms (FTTO, FTTD). Acoustic signals in the office can be modulated onto an optical signals and subsequently demodulated for monitoring (eavesdropping). In the project, we are going to investigate an acoustic sensitivity of a special type of antiresonant silica optical fibres called negative curvature hollow core fibres. Due to low backscattering in these fibres we expect immunity to reflectometric sensor systems. We will optimise a process of drawing these fibres in order to produce relevant lengths of fibres in Czechia and evaluate several types of hollow core fibres to acoustic vibrations.

Key words in English
negative curvature hollow-core fiber, acoustics, optical sensors