Fig. 1. Distributed fiber sensing system for experiment

Fig. 2. Waveforms of optical pulse at end of fiber

Fig. 3. Distortion coefficient of the pulse waveform versus launch power of pulse peak

Fig. 4. Incident power threshold of pulse peak versus pulse width and optical fiber length

Fig. 5. Spectrum of scattered signals in optical fiber

Fig. 6. Power ratio between Rayleigh scattering and Brillouin scattering