A new scheme based on double frequency modulations is proposed to enlarge the measurement range in Brillouin correlation-domain distributed discrimination system with one laser source. The measurement range is increased from ∼5 m to ∼34 m with the spatial resolution maintained to be 10 cm.
We theoretically and experimentally show that the modulation amplitude of the laser frequency determining the spatial resolution of Brillouin optical correlation-domain reflectometry can exceed a half of the Brillouin frequency shift, which was the conventional limitation due to the Rayleigh scattering-induced noise.
Brillouin scattering property of a highly nonlinear photonic crystal fiber with hybrid-core structure is studied. It is shown that there exist five Brillouin resonance peaks in two groups. These peaks have similarly linear dispersion characteristics and their effective acoustic velocities increase monotonically by the order of the peaks. The acousto-optic… (More)