Observation of Cladding Brillouin Scattering (CBS) modes using backscattering technique

Abstract : 

Although cladding Brillouin scattering (CBS) modes propagate mostly in the same direction as the incident optical wave (co-directional propagation), contra-directional propagations have been observed using an electronic spectrum analyzer. Stimulated Brillouin scattering (SBS) studies rely on the interaction between an optical wave and the longitudinal acoustical mode in the fibre. Our approach is rather based on the interaction of the optical wave with the transverse acoustical modes also called guided acoustic-wave Brillouin scattering (GAWBS) modes. Theses modes are highly polarization dependent and their frequencies range from 20 MHz to 800 MHz. Such analysis opens a new and attractive way of detection in fiber-sensing applications. Spectra measured on various fibres are discussed and compared.

DOI : 

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